Which hash algorithms does this tool support?

It computes SHA-1 (160-bit), SHA-256, SHA-384 and SHA-512 hex digests. These are the four secure-hash functions exposed by the browser Web Crypto API. You can enable any combination and all selected digests are produced from the same input simultaneously.

No. MD5 is not part of the browser Web Crypto standard because it is cryptographically broken and unsuitable for integrity or security use. For modern checksums use SHA-256 or stronger; for legacy compatibility SHA-1 is included but should not be relied on for security.

Are my files or text uploaded to a server?

Never. Both text and files are hashed entirely in your browser using the built-in SubtleCrypto digest function. No network request is made and nothing is stored remotely, which makes it safe for confidential documents and passwords.

How do I verify a download checksum?

Switch to File mode, drop the downloaded file, then paste the publisher's expected checksum into the verify box. The matching digest row turns green with a tick if they are identical, or red if they differ — so you can confirm a download was not corrupted or tampered with.

Why do the same inputs always give the same hash?

A hash function is deterministic — identical bytes always produce an identical digest. That is exactly what makes hashes useful for integrity checks: any single-bit change to the input produces a completely different output, so a matching hash means the data is byte-for-byte unchanged.

Can I hash several files at once?

Yes. Drop or select multiple files and each is hashed independently with every chosen algorithm. Results are listed newest-first with the file name and size, and you can copy a single digest or export them all as a text block.

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

A fast, private hash generator that turns any text or file into SHA-1, SHA-256, SHA-384 and SHA-512 hexadecimal digests — all at once. It is built for developers verifying download checksums, sysadmins confirming file integrity, and anyone who needs a quick, trustworthy fingerprint of a string or document without installing command-line tools like sha256sum or certutil.

Everything runs locally in your browser using the native Web Crypto SubtleCrypto.digest function, so confidential files, API payloads and secrets are never uploaded, logged or stored. Pick the algorithms you care about, paste your text or drop your files, and the matching hex digests appear instantly with one-click copy.

How it works

A cryptographic hash function reads your input as raw bytes and produces a fixed-length digest — 40 hex characters for SHA-1, 64 for SHA-256, 96 for SHA-384 and 128 for SHA-512. The function is deterministic and one-way: the same bytes always yield the same digest, and a single changed bit produces a totally different result, but you cannot work backwards from a digest to the original data.

For text, the tool UTF-8 encodes your string and hashes the resulting bytes, so the output exactly matches what echo -n "..." | sha256sum would give on the command line. For files, it reads the file into memory as an ArrayBuffer and digests it directly — identical to the checksum a publisher lists next to a download. The optional verify box normalises a pasted checksum (trims spaces, ignores case) and compares it against every digest on screen, flagging a green match or a red mismatch immediately. It even detects the likely algorithm from the length of the checksum you paste.

Example

Hashing the classic test string The quick brown fox jumps over the lazy dog gives:

Algorithm	Digest (hex)
SHA-1	`2fd4e1c67a2d28fced849ee1bb76e7391b93eb12`
SHA-256	`d7a8fbb307d7809469ca9abcb0082e4f8d5651e46d3cdb762d02d0bf37c9e592`

Change even a single character — say drop the final letter — and every digest changes completely, which is exactly why hashes are reliable integrity checks. To verify a download, paste the publisher’s SHA-256 value into the verify box and look for the green tick next to the SHA-256 row.

Every byte is processed in your browser — no text or file is ever uploaded or stored.