What is an ICC profile?

An ICC profile is a standardized data block, defined by the International Color Consortium, that describes how a device or color space reproduces color. Embedding one in an image lets color-managed software display the same colors consistently across monitors and printers.

Which image formats are supported?

JPEG profiles stored in APP2 ICC_PROFILE markers and TIFF profiles in tag 34675 are decoded directly. PNG profiles live in a zlib-compressed iCCP chunk; the tool detects them but cannot decompress without a library, so it tells you to try a JPEG or TIFF.

What does rendering intent mean?

Rendering intent is how out-of-gamut colors are mapped when converting between color spaces. The four ICC intents are perceptual, media-relative colorimetric, saturation, and ICC-absolute colorimetric. The viewer reads the value stored in the profile header.

Why does my image show no ICC profile?

Many images have no embedded profile and are assumed to be sRGB. That is normal for web images and screenshots. The viewer reports when no ICC_PROFILE marker, iCCP chunk, or TIFF profile tag is present.

Is my image uploaded to a server?

No. The image is read locally with the browser FileReader API and the profile bytes are decoded in JavaScript. The picture never leaves your device, which is ideal for confidential or unpublished images.

What is the ICC Color Profile Viewer?

Free ICC color profile viewer. Reads the embedded ICC profile from a JPEG, PNG or TIFF in your browser, decodes the profile header — color space, PCS, device class, rendering intent, description — and lists the tag table. No image is uploaded. It runs free in your browser on Gera Tools, with nothing uploaded.

ICC Color Profile Viewer

Name: ICC Color Profile Viewer
Creator: Gera Tools
License: https://creativecommons.org/licenses/by/4.0/

A color-managed image can carry an ICC profile — a block of data defined by the International Color Consortium that tells software exactly how its colors should be interpreted. When colors look wrong across devices, the embedded profile is usually the first thing to check. This viewer extracts and decodes that profile in your browser.

How it works

The tool locates the raw ICC bytes inside the image container, then decodes the standard 128-byte ICC profile header:

Extraction. In a JPEG it reads APP2 segments tagged ICC_PROFILE and reassembles multi-part profiles in sequence; in a TIFF it reads tag 34675 from the first IFD. PNG profiles are detected in the iCCP chunk but are zlib-compressed, so it flags them rather than guessing.
Header decode. From the header it reads the profile size, CMM, version, device class (mntr, prtr, scnr, etc.), color space, profile connection space (PCS), creation date, primary platform, and the rendering intent.
Tag table. It then reads the tag count and walks the tag table, listing each tag’s four-character signature, offset, and size, and decoding the human-readable desc / mluc description tag.

What the profile fields mean

Device class. The four-character device class tells you what the profile is describing. mntr means a monitor display profile, prtr is a printer, scnr a scanner, spac an abstract color space, and link a device-link profile that converts directly between two color spaces without going through the PCS.

Color space. This is the color space of the device or data being profiled. Common values are RGB (for monitors, cameras, and most web images), CMYK (for print), and GRAY (for grayscale).

Profile Connection Space (PCS). The PCS is the intermediate color space used when converting between two device profiles. ICC profiles use either XYZ (CIEXYZ) or Lab (CIELAB) as the PCS. Most display profiles use XYZ.

Rendering intent. The rendering intent specifies how colors outside the destination gamut are handled during conversion. The four ICC intents are:

Code	Intent	Typical use
0	Perceptual	Photography, gradients — compress the whole gamut
1	Media-relative colorimetric	Proofing — match in-gamut colors exactly
2	Saturation	Charts, logos — preserve vivid colors
3	ICC-absolute colorimetric	Match absolute white point

Tag table. Each ICC profile contains a table of typed tags. Key ones to look for: desc (profile description, e.g., “Display P3”), wtpt (white point chromaticity), rXYZ/gXYZ/bXYZ (colorant matrix for RGB profiles), cprt (copyright), and chad (chromatic adaptation matrix).

Practical uses

Print workflow. Before sending an image to a print provider, confirm the embedded profile is a CMYK or RGB profile appropriate for the output device. A screen-optimized sRGB profile embedded in a file destined for FOGRA39 offset printing will not reproduce colors correctly.
Web publishing. Most browsers display images assuming sRGB when no profile is present. If your image is tagged with a wide-gamut profile like Display P3, browsers that support P3 will show more vivid colors, but browsers that don’t will interpret the values as sRGB — checking what’s actually embedded explains why colors look different across browsers.
Camera raw processing. Raw processors often embed a ProPhoto RGB or AdobeRGB profile in exported TIFFs. Viewing the embedded profile confirms whether a downstream step (such as a web resize) has correctly converted to sRGB.

Example

A typical display profile shows device class Display device (monitor), color space RGB, PCS XYZ, rendering intent Perceptual, and a description such as Display P3 or sRGB IEC61966-2.1. The tag table lists entries like wtpt (white point), rXYZ / gXYZ / bXYZ (colorant matrix), and desc.

Notes

A missing profile is not an error — most web images simply assume sRGB. The viewer is read-only and runs entirely on your device, so you can inspect the color setup of confidential or print-bound images without sending them anywhere.