What does the file say? No verdict.

Drop a picture on the window. PhotoProof reads what the file claims about itself, checks its Content Credentials, reads how it was compressed and looks at the pixels — then tells you, one sentence per finding, what the evidence shows. On your Mac or Windows PC; the app makes no network connections at all.

Mac App Store Microsoft Store How it works

An OpenAI-signed image, read in full: the C2PA credential, the validation checks, the compression record and the pixel evidence — fifteen seconds, no verdict.

A report: the findings card with four sentences, each labelled shows, suggests or is consistent with; below it the file section with every hash and a copy button per row — The findings first — one sentence each, with a word that says how far the evidence reaches. Then every hash of the file, each a click to copy.

Four maps of the pixels: error level with two repeated regions outlined in orange, noise residual, noise per block, and the map of where the JPEG block grid is missing — The pixels as pictures: error level, noise, and where the picture's own block grid is missing. Repeated regions are outlined.

What the file claims: camera, capture and modify dates, software, place, the XMP editing history, and the Content Credentials section with its status codes — What the file claims about itself, and where those claims disagree with each other. Content Credentials checked offline, every status code shown.

PhotoProof on Windows: the library of earlier reports on the left and a report open beside it — The same report on Windows. Every picture you open is kept in the library; open one from the app, drop it on the window, or right-click it and choose Open with → PhotoProof.

How it works

A report in seven parts, each a different kind of evidence:

What the evidence says. Every finding is one sentence naming one piece of evidence, with one of three words: shows — the file states it; suggests — the pattern points that way; is consistent with — it fits, and fits other stories too. They are never added up into a number.
File. Format by its bytes, dimensions, and every hash: CRC32, MD5, SHA-1, SHA-256, SHA-512, SHA3-256, BLAKE2b, BLAKE3, plus pHash, aHash and dHash for comparing pictures rather than bytes.
What the file claims. Camera, lens, dates, place, software, creator, the XMP editing history and the embedded thumbnail — and the contradictions: an editor in the software tag, a modify date before the capture date, timestamps in different zones, a thumbnail that no longer matches.
Content Credentials. C2PA read and validated offline against the bundled trust list: signer, tool, AI-generated flag, every status code. Absence is stated as absence, not as evidence.
Compression. JPEG quality, whether the quantisation tables are the standard scaled set or a camera's or editor's own, chroma subsampling, and the comb in the coefficient histogram that a second save at higher quality leaves.
Pixels. Error level analysis, noise residual and noise per block, and a map of where the picture's own JPEG block grid is missing — the trace a pasted or resampled region has lost. Repeated regions are found by block matching and outlined.
Known marks. Stable Diffusion, DALL·E, Midjourney and Adobe Firefly signatures in the metadata; the marks of a screenshot.

Export the report as a PDF, or every finding of every picture in the sidebar as a CSV. Reads JPEG, PNG, TIFF, WebP and GIF on both, and HEIC on Mac.

What it does not do

It does not say real or fake. A single verdict is what people want and what misleads them; PhotoProof shows the evidence and says how far it reaches
No server, no account, no network. On Mac the app is sandboxed without the network entitlement; on Windows it contains no networking code. Your picture does not leave your computer
No face or deepfake classifier. A model's opinion is not evidence; a file's metadata, credentials and compression are
Not a court tool. It is the first look, for anyone deciding whether to trust a picture

English and Turkish. Mac: macOS 26 on Apple silicon. Windows: Windows 10 (version 1809) or later, 64-bit.

How it works

What it does not do

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