Developer Tools

Fast, private developer utilities — JSON, encoding, hashing, color, CSS, generators, formatters and reference cheatsheets. Everything runs client-side in your browser, so your code and data never leave your device.

JSON & Data

JSON Formatter & Validator

Pretty-print, minify and validate JSON instantly.

SQL Playground

Run real SQL against an in-browser SQLite database — no install, no server.

CSV Explorer & Cleaner

Paste or upload a CSV, then sort, filter, de-duplicate and export it.

JSON to CSV Converter

Flatten a JSON array of objects into clean CSV.

CSV to JSON Converter

Turn CSV into a clean JSON array of objects.

JSON to YAML Converter

Convert JSON into clean, readable YAML.

YAML to JSON Converter

Convert YAML config into formatted JSON.

XML Formatter & Minifier

Pretty-print or minify XML right in your browser — nothing is uploaded.

YAML Formatter & Re-indenter

Normalise YAML indentation and spacing in your browser — no upload.

SQL Formatter & Beautifier

Pretty-print SQL queries in your browser — keywords on their own lines.

JSON to XML Converter

Convert JSON objects and arrays into well-formed XML.

XML to JSON Converter

Convert XML documents into clean, structured JSON.

JSON to TOML Converter

Convert JSON into clean TOML config syntax.

TOML to JSON Converter

Convert TOML config files into structured JSON.

JSON to TypeScript Interface

Generate TypeScript interfaces from a JSON sample.

JSON Escape / Unescape

Encode text into a JSON string or decode it back.

CSV to TSV Converter

Convert comma-separated values to tab-separated values.

TSV to CSV Converter

Convert tab-separated values to proper RFC 4180 CSV.

JSON to SQL INSERT Generator

Turn a JSON array of objects into SQL INSERT statements.

CSV to SQL INSERT Generator

Turn a CSV file into SQL INSERT statements.

JSON String Escape / Unescape

Escape text into a JSON string literal, or unescape it back.

JSON Minifier

Compact JSON to a single line and validate it.

JSON Diff Tool

Compare two JSON documents and see what changed.

JSON to Go Struct

Generate Go structs with json tags from a JSON sample.

JSON to Zod Schema

Generate a Zod validation schema from a JSON sample.

SQL Cheatsheet

The everyday SQL statements, grouped and searchable — copy any one.

JSONPath Tester

Test JSONPath expressions against your JSON, live in the browser.

Mock JSON Generator

Generate realistic mock JSON records for users, products and posts.

JSONPath Query Playground

Paste JSON, run JSONPath expressions, see matched values and their paths live.

Excel (XLSX) to CSV & JSON Converter

Upload a spreadsheet, pick a sheet, preview it, and export clean CSV or JSON.

JSON to .env Converter

Turn a JSON config object into dotenv key=value lines — in your browser.

.env to JSON Converter

Parse a dotenv file into a clean JSON object — privately in your browser.

JSON Flattener

Flatten nested JSON into single-level dot-path keys — in your browser.

JSON Unflattener

Rebuild nested JSON from flat dot-path keys — privately in your browser.

JSON Key Sorter

Sort JSON object keys alphabetically and recursively — in your browser.

SQL IN Clause Builder

Turn a list of values into a ready-to-paste SQL IN (...) clause.

CSV to HTML Table

Convert CSV into a clean, escaped HTML <table> you can paste anywhere.

HTML Table to CSV

Extract any HTML <table> into clean, properly quoted CSV.

JSON Schema Generator

Paste JSON and infer a ready-to-use JSON Schema you can copy or download.

CSV Merger

Combine two or more CSV files by stacking rows or joining on a key column.

YAML / JSON / TOML Converter

Paste any of the three formats and convert instantly between them.

CSV Statistics Analyzer

Upload a CSV and get instant per-column stats, distributions and histograms.

JSON Flatten / Unflatten

Convert nested JSON to dot-notation keys and back, losslessly.

SQL and GraphQL Formatter

Paste a messy SQL or GraphQL query and pretty-print it with clean indentation.

JSON Pretty-Diff

Compare two JSON documents and see exactly what was added, removed or changed.

JSON to Protobuf Schema Generator

Paste sample JSON and infer a ready-to-use Protocol Buffers .proto file.

JSON to TypeScript Interfaces

Paste JSON, get clean nested TypeScript interfaces or type aliases.

SQL Minifier

Collapse formatted SQL into the smallest valid one-line statement.

CSV Diff Tool

Compare two CSV files by a key column and see added, removed and changed rows.

CSV to JSON Converter (and JSON to CSV)

Convert CSV to a JSON array or JSON back to CSV — with delimiter and header controls.

TOML ⇄ JSON Converter

Convert between TOML and JSON in either direction, with validation.

YAML to JSON Converter (Both Directions)

Paste YAML or JSON, convert either way with validation and clear error messages.

Nested JSON Flattener

Flatten nested JSON to dot-notation keys, unflatten back, and export flat CSV.

Query String Parser & Builder

Parse a URL query into an editable table, then rebuild and copy it.

Product Schema Generator

Generate valid schema.org Product JSON-LD for rich Google results.

Breadcrumb Schema Generator

Generate valid schema.org BreadcrumbList JSON-LD in seconds.

FAQ Schema Generator

Build valid FAQPage JSON-LD structured data in seconds.

Schema Markup Generator

Generate valid JSON-LD structured data for any schema.org type instantly.

Video Schema Generator

Generate valid schema.org VideoObject JSON-LD for better video SEO.

Article Schema Generator

Build valid JSON-LD structured data for any article type in seconds.

Local Business Schema Generator

Generate valid schema.org/LocalBusiness JSON-LD for Google Rich Results — free and instant.

Encoding & Crypto

JWT Decoder

Decode any JSON Web Token instantly — header, payload, and timestamps.

Base64 Encoder

Encode text to Base64 — standard or URL-safe — in your browser.

Base64 Decoder

Decode Base64 back to text — standard and URL-safe — in your browser.

URL Encoder

Percent-encode text and URLs — component or full-URL mode.

HTML Entity Encoder & Decoder

Escape and unescape HTML entities — safely, in your browser.

SHA-1 Hash Generator

Generate a SHA-1 hash from any text instantly — in your browser.

SHA-256 Hash Generator

Generate a SHA-256 hash from any text instantly — in your browser.

SHA-512 Hash Generator

Generate a SHA-512 hash from any text instantly — in your browser.

MD5 Hash Generator

Generate an MD5 hash from any text instantly — in your browser.

CRC-32 Checksum Generator

Compute a CRC-32 checksum from any text — hex and decimal, in your browser.

UUID v4 Generator

Generate random RFC 4122 UUID v4 identifiers in bulk.

UUID v1 Generator

Generate time-based RFC 4122 UUID v1 identifiers.

UUID v7 Generator

Generate sortable, timestamp-prefixed UUID v7 identifiers.

ULID Generator

Generate sortable, URL-safe ULID identifiers.

Nano ID Generator

Generate compact, URL-safe Nano IDs with custom length and alphabet.

JWT Claims Explainer

Decode a JWT and see what every standard claim actually means.

Color Shades & Tints Generator

Generate tints, shades and a full tonal scale from any base colour.

JWT Generator (HS256)

Sign HS256 JSON Web Tokens in your browser with Web Crypto.

CSS Color Shades & Tints Generator

Build shades and tints of any colour and copy them as CSS variables.

Tailwind Shade Generator

Turn one colour into a full Tailwind 50–950 palette config.

Color From Text Hash

Turn any string into a consistent, repeatable color.

HMAC Generator

Keyed-hash message authentication codes — SHA-256, SHA-384, SHA-512.

Base32 Encoder & Decoder

Encode and decode RFC 4648 Base32 — case-insensitive, A–Z and 2–7.

Base58 Encoder & Decoder

Encode and decode Base58 using the Bitcoin alphabet.

SHA3-256 Hash Generator

Generate FIPS 202 SHA3-256 (Keccak) hashes in your browser.

RIPEMD-160 Hash Generator

Generate 160-bit RIPEMD-160 hashes in your browser.

CSS Box Shadow Generator

Build a box-shadow with live preview and copy the CSS.

CSS Text Shadow Generator

Style a text-shadow with live preview and copy the CSS.

Base64 URL-Safe Encoder

Encode and decode Base64URL (RFC 4648 §5) for tokens and URLs.

Quoted-Printable Encoder

Encode and decode Quoted-Printable (RFC 2045) email content.

Punycode Converter

Convert between Unicode domains and Punycode (xn--) per RFC 3492.

Base85 Encoder

Encode and decode Base85 (Z85) — compact 4-byte to 5-char binary text.

ASCII85 Encoder

Encode and decode Adobe ASCII85 used in PostScript and PDF.

File Hash & Checksum Tool

Compute MD5, SHA-1, SHA-256 and SHA-512 for any file — and verify it.

JWT Builder

Build and sign a JSON Web Token (HS256) entirely in your browser.

Multiple Box Shadow Generator

Stack, reorder and tune layered CSS box-shadows with a live preview.

Hash Generator (SHA-1 / SHA-256 / SHA-384 / SHA-512)

Hash text or files with multiple SHA algorithms at once and verify checksums.

CSS Text-Shadow Generator

Build layered text shadows visually and copy the CSS.

Base64 File Encoder & Decoder

Encode any file to Base64 or a data URL, and decode Base64 back to a downloadable file.

UUID / ULID Batch Generator

Generate hundreds of v4 UUIDs or ULIDs at once, then copy or download.

Text Encryptor (AES-256)

Password-encrypt any text with AES-256-GCM, entirely in your browser.

HTML Entity Encoder / Decoder

Convert text to and from HTML entities — named and numeric.

Base32 Encoder / Decoder

Encode and decode text to RFC 4648 base32, right in your browser.

URL Encoder / Decoder

Percent-encode or decode URLs and query values — component or full-URL mode, batch lines, copy.

String Escape Tool

Escape or unescape a string for JSON, JavaScript, CSV, SQL, regex and shell.

Base58 Encoder / Decoder

Bitcoin-style Base58 and Base58Check encode and decode, right in your browser.

Color

Color Converter + WCAG Contrast Checker

Convert hex, RGB, and HSL colours instantly — and check WCAG contrast ratios.

Hex to Text Converter

Convert hex bytes to text and text to hex — UTF-8, in your browser.

WCAG Color Contrast Checker

Check text and background colors against WCAG AA and AAA contrast ratios.

Decimal to Hex Converter

Convert any whole number to hexadecimal, with optional 0x prefix.

Hex to Decimal Converter

Turn any hexadecimal value into its base-10 number.

Hex to RGB Converter

Turn any hex colour code into an RGB value instantly.

RGB to Hex Converter

Convert RGB channel values into a hex colour code.

RGB to HSL Converter

Convert RGB colour values into hue, saturation and lightness.

HSL to RGB Converter

Convert hue, saturation and lightness into RGB values.

Hex to CMYK Converter

Convert a hex colour code into CMYK for print work.

Color Name to Hex Converter

Look up the hex code for any CSS named colour.

CSS Gradient Generator

Build linear and radial CSS gradients with a live preview and copy-ready code.

Complementary Color Finder

Find complementary, analogous, triadic and tetradic colour harmonies.

Color Blindness Simulator

See how a colour looks with protanopia, deuteranopia and tritanopia.

Random Color Palette Generator

Generate harmonious 5-colour palettes with copy-ready hex and CSS.

RGB to HSV Converter

Convert RGB colour values into hue, saturation and value.

CMYK to RGB Converter

Convert print CMYK percentages into screen RGB values.

Hex to HSL Converter

Convert a hex colour code into hue, saturation and lightness.

RGBA to Hex Converter

Convert RGBA colour with alpha into an 8-digit hex code.

HSV to RGB Converter

Convert hue, saturation and value into RGB colour values.

Contrast Grid Checker

WCAG contrast ratios for every colour pair in your palette, at a glance.

Monochrome Palette Generator

Build a cohesive single-hue palette from one base colour.

Analogous Color Finder

Find harmonious neighbour colours on the colour wheel.

Color Temperature Converter (Kelvin to RGB)

Turn a Kelvin colour temperature into an approximate sRGB colour.

Pantone to Hex (Approximate)

Look up an approximate screen hex for a Pantone PMS coated colour.

Hex to Pantone (Approximate)

Find the closest Pantone PMS coated colours to any hex value.

Color Mixer (Blend Two Colors)

Blend two colours at any ratio — gamma-correct or simple sRGB.

Triadic Color Scheme Generator

Build a balanced triadic palette — three hues 120° apart.

CSS Gradient Generator (Pro)

Build multi-stop linear, radial and conic CSS gradients visually, then copy the code.

CSS Text Gradient Generator

Create gradient-filled text and copy the CSS.

CSS Color Names List

All CSS named colors with hex and RGB — searchable.

CSS Conic Gradient Generator

Build colour wheels, pie charts and angular sweeps with a draggable conic editor.

Color Contrast Checker

Check WCAG contrast ratio for two colors with live AA/AAA pass-fail.

Color Format Converter

Convert a colour between HEX, RGB, HSL and HWB live — with a picker and alpha.

Color Scale Builder

Generate an even, multi-stop colour ramp with CSS, JSON and SVG export.

CSS Color Names

Searchable list of every named CSS colour with swatch, hex, rgb and hsl.

WCAG Contrast Checker

Instant AA/AAA contrast ratio check with sRGB-accurate maths and fix suggestions.

Hex to RGBA Converter

Instantly convert any hex colour to rgba(), rgb(), HSL, CSS variables and Tailwind classes.

Color Contrast Ratio Checker

Calculate the exact WCAG contrast ratio with full step-by-step formula working.

CSS & Frontend

Favicon Generator

Create favicon PNGs in all sizes — 16 to 512 px — right in your browser.

robots.txt Generator

Generate a robots.txt with allow, disallow, crawl-delay and sitemap.

Meta Tags Generator

Generate SEO, Open Graph and Twitter Card meta tags for any page.

CSS Specificity Calculator

Calculate the specificity of any CSS selector as an (a, b, c) score.

CSS Minifier

Compress stylesheets by stripping comments and whitespace.

CSS Flexbox Cheatsheet

Every flexbox property, grouped and searchable — copy any one-liner.

CSS Grid Cheatsheet

Every CSS grid property, grouped and searchable — copy any one-liner.

CSS Properties Reference

Common CSS properties grouped by purpose and searchable.

CSS Border Radius Generator

Round corners individually or together with a live preview.

CSS Transform Generator

Combine translate, rotate, scale and skew with a live preview.

CSS Filter Generator

Blur, brightness, contrast, grayscale, sepia and more — live preview.

CSS Clip-Path Generator

Polygon clip-path shapes — triangles, hexagons, stars and custom.

CSS Glassmorphism Generator

Frosted-glass cards with backdrop-filter blur, tint and border.

Cubic Bezier Generator

Drag the curve to craft custom cubic-bezier() easing for CSS.

CSS Animation Keyframes Generator

Fade, slide, bounce, spin and shake @keyframes with live preview.

Favicon Kit Generator

Turn one image into a complete favicon set — ICO, PNGs, manifest and zip.

Spreadsheet Lite — Online Grid with Formulas

A fast browser spreadsheet with SUM/AVG formulas and CSV + XLSX import & export.

UTM Link Builder

Build tagged campaign URLs with utm_source, utm_medium and more.

Canonical URL Builder

Normalise a URL and build its rel=canonical tag.

CSS Grid Generator

Build a CSS grid layout visually and copy the code.

CSS Flexbox Playground

Experiment with flexbox properties and copy the CSS.

CSS Triangle Generator

Make CSS triangles with the border trick and copy the code.

CSS Scrollbar Styler

Style custom scrollbars and copy cross-browser CSS.

CSS Variables Generator

Build a :root block of CSS custom properties and copy it.

CSS Unit Converter

Convert between px, rem, em, pt, pc and physical CSS units.

CSS Animation Builder

Multi-stop @keyframes editor with a live preview and copy-ready CSS.

CSS clamp() Generator

Turn min/max sizes and a viewport range into a responsive clamp() value.

CSS Aspect Ratio and object-fit Helper

Visualize aspect ratios and object-fit, then copy ready-to-paste CSS.

Cubic Bezier Easing Editor

Drag, preview and export cubic-bezier() easing curves for CSS.

CSS Grid Layout Builder

Paint named template areas, size every track, copy grid-template CSS.

Border Radius Generator (Elliptical, Per-Corner)

Design rounded and elliptical corners with live preview and copy-ready CSS.

Flexbox Playground

Visually build a CSS flexbox layout and copy the exact HTML and CSS.

CSS Formatter & Minifier

Beautify, minify and tidy CSS in your browser — sort properties, shorten hex, copy.

CSS Pattern Generator

Build repeating geometric backgrounds — stripes, dots, grids, checks — and copy the CSS.

Robots Meta Tag Generator

Generate correct robots meta tags with indexing, follow and snippet controls.

Sitemap URL Counter

Paste any sitemap.xml and instantly count every URL with full metadata analysis.

Canonical Tag Checker

Validate your canonical link tag and catch canonicalisation errors instantly.

Generators

.gitignore Generator

Build a .gitignore from language, OS and editor templates.

URL Slug Generator

Turn any title into a clean, SEO-friendly URL slug.

Random PIN Generator

Generate secure random numeric PINs of any length, right in your browser.

Pronounceable Password Generator

Create strong passwords you can actually say and remember.

API Key Generator

Generate secure random API keys in hex, base62 or base64url, with an optional prefix.

htpasswd Generator

Create Apache/Nginx .htpasswd entries with APR1 (MD5) or SHA-1 hashing.

Random Username Generator

Generate memorable usernames from random adjectives and nouns.

Strong Passphrase Generator

Build memorable, high-entropy passphrases from random words.

Random Date Generator

Generate random dates within any range and format.

Modular Scale Generator

Build a harmonious type scale from a base size and ratio.

Design Tokens Generator

Turn a base colour into a full tint/shade ramp and exportable design tokens.

Test Credit Card Number Generator

Luhn-valid fake card numbers for sandbox & form testing.

Random MAC Address Generator

Valid random MAC addresses in any format — colon, hyphen, Cisco.

Random IP Address Generator

Random IPv4 & IPv6 addresses, public-only option included.

Random User Generator

Fake people with name, email, phone & address for test data.

Mock Data Generator

Define typed fields, generate thousands of realistic rows, export JSON, CSV or SQL.

Password Entropy Calculator

Measure password strength in bits and estimated time to crack.

Dockerfile Generator

Build a clean, cache-friendly Dockerfile from a stack preset — copy or download.

Nginx Config Generator

Build a production-ready nginx server block from simple options.

Advanced Password Generator

Cryptographically random passwords with a live entropy and strength meter.

Slugify Tool — Text to URL Slug Generator

Turn any title into a clean, URL-safe slug with full control.

India PIN Code Validator

Instantly check whether an Indian PIN code is structurally valid.

Philippines Phone Number Validator

Validate any Philippine mobile or landline number — network, area code and E.164 format.

Open Graph Preview Generator

See exactly how your link card looks on Facebook, Twitter, Slack, and Discord before you publish.

Hreflang Tag Generator

Generate correct hreflang tags for every international page in seconds.

URL Slug Generator for SEO

Turn any page title into a clean, search-engine-friendly URL slug instantly.

Formatters & Minifiers

India GSTIN Validator

Validate a 15-character GSTIN — state code, PAN and base-36 check digit.

HTML Formatter & Minifier

Pretty-print or minify HTML in your browser — nothing is uploaded.

JavaScript Minifier

Strip comments and whitespace to shrink your JS.

HTML Minifier

Shrink HTML by removing comments and collapsing whitespace.

ISO 8601 Date Formatter

Format any date as a standards-compliant ISO 8601 string.

Reference & Cheatsheets

Regex Tester with Plain-English Explainer

Test regular expressions live and see them explained in plain English.

Regex Builder & Tester

Build, test and debug regular expressions with live match highlighting.

HTTP Status Codes Reference

Every HTTP status code with its meaning — searchable and instant.

MIME Types Reference

Look up the right Content-Type for any file extension — searchable.

Git Commands Cheatsheet

The everyday Git commands, grouped and searchable — copy any one.

Linux Commands Cheatsheet

The everyday Linux terminal commands, grouped and searchable — copy any one.

Docker Commands Cheatsheet

The everyday Docker commands, grouped and searchable — copy any one.

Regex Replace Tool

Find and replace with regular expressions and capture groups.

ISO Country Codes Reference

Look up ISO 3166-1 alpha-2, alpha-3 and numeric country codes.

ISO Currency Codes Reference

Look up ISO 4217 currency codes, numbers and minor units.

International Calling Codes Reference

Find the international dialling (country) code for any country.

Time Zone List Reference

Browse IANA time zone names and their UTC offsets.

ISO Language Codes Reference

Look up ISO 639-1 and 639-2 language codes and native names.

HTML Tags Reference

Every common HTML element grouped and searchable.

File Extensions Reference

Common file extensions and what they mean — searchable.

Port Numbers Reference

Well-known TCP and UDP ports and their services — searchable.

Emoji Shortcodes Reference

GitHub and Slack emoji shortcodes — searchable, click to copy.

DNS Record Types Reference

Searchable list of DNS record types — A, AAAA, CNAME, MX, TXT and more.

Regex Syntax Reference

Searchable cheat sheet of regular-expression tokens, quantifiers and flags.

Markdown Syntax Reference

Searchable cheat sheet of Markdown syntax — headings, emphasis, lists, links and code.

Vim Commands Cheat Sheet

Searchable cheat sheet of Vim commands — modes, motion, editing, search and files.

Unicode Blocks Reference

Common Unicode blocks with their code-point ranges and contents.

HTTP Methods Reference

GET, POST, PUT and the rest — safe, idempotent, cacheable.

ASCII Control Codes Reference

The 33 ASCII control characters — abbr, caret and escape.

HTTP Status Codes Reference

Searchable list of HTTP status codes with meaning and when to use each.

ASCII Table Reference

Every ASCII code in decimal, hex, octal, binary and HTML entity — searchable, click-to-copy.

MIME Type Finder

Look up the MIME type for any file extension — or vice versa.

HTTP Headers Reference

Searchable list of HTTP request and response headers with purpose, example and direction.

Regex Cheatsheet & Tester

A categorized regex token reference plus a live, highlighting tester.

Git Command Builder

Pick an action — branch, stash, undo, rebase — and get the exact git command plus a plain-English explanation.

ID & Number Validators

Text Diff Checker

Compare two blocks of text line by line and highlight every change.

Luhn Algorithm Checker

Validate any number with the Luhn (mod-10) checksum.

IBAN Validator

Check any IBAN with the ISO 13616 mod-97 algorithm.

Credit Card BIN Checker

Identify the card network from a BIN / IIN prefix.

EU VAT Number Validator

Check the format of any EU VAT number — all 27 member-state patterns.

UK VAT Number Validator

Verify a UK VAT number's check digit with HMRC's mod-97 algorithm.

Australian ABN Validator

Check an 11-digit ABN with the ATO's mod-89 checksum algorithm.

ISBN Validator

Validate ISBN-10 and ISBN-13 check digits and convert between them.

Semver Range Checker

Check whether a version satisfies an npm semver range like ^1.2.0.

Russia INN Validator

Check a Russian INN (10 or 12 digit) check digits — in your browser.

Ukraine INN Validator

Decode a Ukrainian tax number (RNOKPP) — date, gender and checksum.

Serbia JMBG Decoder

Decode a Serbian JMBG — date of birth, region, gender and checksum.

Austria SVNR Validator

Decode an Austrian social-security number — date and check digit.

Meta Title Length Checker

Check title-tag length in characters and approximate SERP pixels.

Keyword Density Checker

Count word frequency and density in any text to avoid keyword stuffing.

IEEE 754 Floating-Point Converter

Decimal to IEEE 754 single and double precision bits.

Credit Card Validator

Luhn checksum plus card-brand detection — all in your browser.

India PAN Validator — Check Every Rule in Your PAN

Validate all structural rules in an Indian PAN and decode every embedded field.

Poland PESEL Validator

Verify any Polish PESEL number — checksum, birth date, gender, century.

India Aadhaar Number Validator

Verify any 12-digit Aadhaar with a full Verhoeff checksum and step-by-step trace.

Brazil CNPJ Validator

Verify Brazilian company ID numbers with the real two-step mod-11 algorithm.

Croatia OIB Validator

Verify a Croatian OIB with the ISO 7064 MOD 11,10 check digit — and see every step.

Brazil CPF Validator

Validate a CPF with real MOD-11 check digits, see the algorithm step by step, and decode the embedded fiscal region.

Canada SIN Validator — Social Insurance Number Checker (Luhn)

Validate a Canadian SIN with the Luhn checksum and read its province or temporary-resident flag.

Ireland PPS Number Validator

Validate an Irish PPSN with full modulo-23 check-character verification and step-by-step working.

Czech Rodné číslo Validator

Validate a Czech birth number and decode its hidden birth date and gender.

Denmark CPR Number Validator

Validate a Danish CPR number — date, serial, century, gender and legacy mod-11 check.

Estonia Isikukood Validator

Verify an Estonian personal ID code — control digit, birth date and gender decoded instantly.

Finland HETU Validator

Validate a Finnish henkilötunnus with the full DVV mod-31 algorithm.

Italy Codice Fiscale Validator

Validate an Italian tax code with full checksum verification and decoded birth data.

Norway Fødselsnummer Validator

Validate a Norwegian national ID number with full mod-11 checksum verification.

South Korea RRN Validator

Verify a Korean Resident Registration Number with the real mod-11 check-digit algorithm.

Spain DNI / NIE Validator

Verify a Spanish DNI or NIE in one click — control letter, mod-23 algorithm explained.

Sweden Personnummer Validator

Validate a Swedish personal identity number and extract birth date, gender and county.

Romania CNP Validator

Validate a Romanian CNP and decode birth date, gender and county.

Bulgaria EGN Validator

Validate a Bulgarian EGN with weighted-checksum verification and birth-date + region extraction.

Lithuania Asmens Kodas Validator

Verify any Lithuanian personal code and extract birth date, gender and century.

Mexico CURP Validator

Verify any 18-character CURP with the real RENAPO check-digit algorithm and decode birth date, gender and state.

Albania NID Validator

Validate an Albanian Personal Number (NUP) and read its embedded birth date, gender and citizen type.

Colombia NIT Validator

Compute and verify the DIAN check digit for any Colombian NIT.

Iceland Kennitala Validator

Verify an Icelandic kennitala with the official Lund weighted mod-11 check digit.

Taiwan National ID Validator

Verify a ROC National ID number and decode its embedded district and gender.

Germany Personalausweis Document-Number Validator

Verify the 9-character German national ID document number using the ICAO 9303 check-digit algorithm.

Malaysia MyKad Validator

Validate a 12-digit MyKad number: date, place of birth, gender and serial.

North Macedonia EMBG Validator

Validate a Macedonian EMBG and decode birth date, gender and region.

Serbia JMBG Validator

Validate a Serbian JMBG number with full modulo-11 checksum and decoded fields.

Slovenia EMŠO Validator

Verify any Slovenian EMŠO number and decode its birth date, gender, and region.

Ukraine RNOKPP Validator

Verify a Ukrainian tax number and decode its embedded birth date, gender and checksum.

Uruguay CI Validator

Verify the check digit on a Uruguayan Cédula de Identidad instantly.

Argentina CUIL Validator

Verify an Argentine CUIL with the ANSES mod-11 checksum and decode the type prefix.

Egypt National ID Validator

Validate a 14-digit Egyptian National ID and decode its birth date, governorate and gender.

Greece AMKA Validator

Validate a Greek social security number with the full Luhn checksum algorithm.

Kazakhstan IIN Validator

Validate a Kazakhstan IIN with two-pass checksum verification and birth-date, gender and century extraction.

Morocco CIN Validator

Validate a Moroccan national ID number and decode the issuing bureau.

Thailand National ID Validator

Verify a 13-digit Thai national ID against the official DOPA check-digit formula.

Netherlands BSN Validator

Verify a Dutch Burgerservicenummer with the full elfproef (11-test) breakdown.

Portugal NIF Validator

Validate a Portuguese NIF with mod-11 check digit — see WHY it passes or fails.

Canada Postal Code Validator

Instantly check whether a Canadian postal code is structurally valid.

France Phone Number Validator

Validate any French phone number against the ARCEP national plan — instantly, in your browser.

Germany Postcode Validator

Instantly validate any German PLZ and identify its federal state and region.

Austrian IBAN Validator

Instantly validate any Austrian IBAN — BLZ, account number and ISO 7064 checksum.

Belgian IBAN Validator

Verify a Belgian IBAN with ISO mod-97 and the national check digits.

Danish IBAN Validator

Instantly verify any Danish bank account number in IBAN format.

German IBAN Validator

Validate a German IBAN with ISO 7064 MOD-97, BLZ structure and Kontonummer checks.

Italian IBAN Validator

Validate any Italian IBAN instantly — CIN, ABI, CAB and MOD-97 checksum checked.

Luxembourg IBAN Validator

Instantly verify any Luxembourg IBAN against the ISO 7064 MOD-97-10 standard.

Norwegian IBAN Validator

Validate any Norwegian IBAN with Modulus-11 and ISO 7064 checks.

Polish IBAN Validator (NRB)

Validate any Polish IBAN instantly — checksum, bank code and branch decoded.

Saudi Arabia IBAN Validator

Instantly verify any SA IBAN against ISO 7064 MOD-97 and the SAMA bank-code registry.

Swedish IBAN Validator

Instantly verify any Swedish bank account number in IBAN format — ISO 7064 checksum, clearing number and bank name included.

Netherlands Postcode Validator

Instantly check whether a Dutch postcode is structurally valid.

Pakistan Phone Number Validator

Verify any Pakistani mobile or landline number — format, operator, city.

UK Phone Number Validator

Instantly check if a UK phone number is valid, identify its service type and get the correct formatted versions.

US Phone Number Validator

Instantly check whether a US phone number is structurally valid under NANP rules.

US ZIP Code Validator

Validate any US ZIP-5 or ZIP+4 code with prefix-range and state lookup.

France Postcode Validator

Validate any French postcode (code postal) and instantly identify the department and region.

Netherlands IBAN Validator

Verify any Dutch IBAN with the full NL BBAN structure check and ISO 7064 MOD-97 algorithm.

Australia Phone Number Validator

Validate any Australian phone number against the ACMA Numbering Plan — mobile, geographic, freecall and more.

Bangladesh Phone Number Validator

Instantly check any Bangladeshi mobile number format and identify the operator.

Brazil CEP Validator

Validate a Brazilian postal code, decode its state and macro-region, and classify the suffix type — all offline.

Germany Phone Number Validator

Validate any German phone number — landline, mobile, or service number — and get the correct E.164 format instantly.

Greek IBAN Validator

Validate any Greek IBAN instantly — bank code, branch code and MOD-97 checksum verified.

Irish IBAN Validator

Validate an Irish IBAN with full MOD-97 checksum verification and BBAN structure breakdown.

Swiss IBAN Validator

Validate a Swiss IBAN with ISO 7064 MOD-97, IID structure and account format checks.

Indonesia Phone Number Validator

Validate any Indonesian mobile or landline number against the BRTI numbering plan.

Japan Postal Code Validator

Validate any Japanese 7-digit postal code and identify its prefecture instantly.

Kenya Phone Number Validator

Instantly check any Kenyan phone number format, operator and E.164 form.

Nigeria Phone Number Validator

Instantly check if a Nigerian phone number is valid and identify the network operator.

South Africa Phone Number Validator

Instantly validate and format any South African phone number — local, E.164 or +27 prefix.

UK Postcode Validator

Instantly check any UK postcode against the Royal Mail format spec and see the area, district, sector and unit breakdown.

Portugal IBAN Validator

Validate a Portuguese IBAN with ISO mod-97 + Banco de Portugal local check digits.

Australia Postcode Validator

Check any 4-digit Australian postcode against the Australia Post Addressing Standard — state, delivery type and allocation confirmed instantly.

Brazil Phone Number Validator

Validate any Brazilian phone number against ANATEL E.164 rules — area code, mobile 9th digit, and line type decoded instantly.

Egypt Phone Number Validator

Instantly verify any Egyptian phone number and identify the mobile operator or governorate.

French IBAN Validator

Verify a French IBAN with the RIB key check and ISO 7064 mod-97.

UAE IBAN Validator

Verify any United Arab Emirates IBAN with the full ISO 7064 MOD-97-10 checksum.

India Phone Number Validator

Validate any Indian mobile or landline against the TRAI numbering plan — operator, circle, and E.164 format included.

Turkey TC Kimlik No Validator

Verify the two check digits of a Turkish national ID number instantly.

Spain IBAN Validator

Validate a Spanish IBAN — MOD-97 checksum + both internal CCC check digits explained.

Turkey IBAN Validator

Validate a Turkish IBAN — MOD-97 checksum, bank code lookup and full BBAN breakdown.

Finnish IBAN Validator

Instantly verify any Finnish bank account number in IBAN format — ISO 7064 checksum, bank code and issuing bank included.

China Resident ID Validator

Verify an 18-character Chinese Resident Identity Card number and decode its embedded data.

Meta Description Length Checker

Instantly see if your meta description is the right length for Google.

Title Tag Length Checker

Check whether your HTML title tag fits Google's SERP display limit.