AIWatermarkCheckerOpen tool

Test data

Sample files

Synthetic fixtures generated by this project's build script, so you can try the reader without hunting for files. They are NOT real vendor files — each manifest says “fixture” and carries no genuine signature.

Sample fixture: claude-fixture

claude-fixture.png

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Claude (fixture)

Simulates a Claude-generated PNG with Content Credentials.

Sample fixture: openai-fixture

openai-fixture.png

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gpt-image-1 (fixture)

Simulates a GPT Image output with a creation + edit history.

Sample fixture: photoshop-fixture

photoshop-fixture.png

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Adobe Photoshop 2025 (fixture)

A human editing tool WITH credentials — proves 'has C2PA' does not equal 'made by AI'.

Sample fixture: stripped-fixture

stripped-fixture.png

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Claude (fixture, credentials removed)

Same generator as the Claude sample but shipped WITHOUT its caBX chunk — shows what careless re-encoding does.

Sample fixture: clean-camera-fixture

clean-camera-fixture.png

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Nikon Z 6II (fixture)

A no-credentials control with camera-style XMP — should read as 'no provenance data'.

In the spirit of honesty: we mark every fixture with the word “fixture” and leave signatures non-genuine, so no one mistakes synthetic samples for vendor output. The reader treats them exactly like real C2PA files structurally — that's the point of a test fixture — but the vendor claim inside is simulated.

Reproduce: npm run samples — sources in scripts/make-samples.mjs.