How AI art authentication works
Traditional art authentication is a painstaking process: a specialist examines brushwork under raking light, compares signature samples side-by-side, reviews provenance documents, and sometimes orders material science tests — infrared reflectography, X-ray fluorescence, pigment analysis. It is accurate and it is expensive, often running from several hundred to several thousand dollars before a single stroke of the artwork is examined in person.
ArtSleuth's AI art authentication isn't a replacement for that process — it's the step that comes before it. The tool gives collectors, dealers, and curious owners a structured, defensible preliminary opinion so they know whether a painting is worth the cost of a physical expertise at all.
Behind the scenes, every uploaded image goes through a multi-stage pipeline:
- Image description — a vision model produces a rich machine-readable description of composition, medium, figures, and symbolism.
- Technical analysis — separate passes for brushwork identification, surface texture, craquelure, paint freshness, and an estimated age range.
- Signature analysis — the AI locates any signature or monogram, transcribes it, and compares against documented signatures of candidate artists.
- Famous-artwork similarity — the image is compared to thousands of documented masterpieces to flag copies and reproductions of known works.
- Attribution and valuation — a final model reasons over all of the above, weighs the evidence, and produces attribution confidence plus authentic / copy value ranges sourced from recent auction comparables.
What you get back
Every analysis run ends with a structured report covering:
- Primary artist attribution with a percentage confidence and up to three alternative candidates, each with the artist's active dates.
- Signature analysis — the transcribed mark, its location, and whether the script is consistent with the claimed artist.
- Condition assessment — state of the canvas, paint layer, varnish, visible damage or restoration, and preservation recommendations.
- Famous-artwork similarity check — if your painting resembles a documented masterpiece, you see the name, the artist, and a similarity percentage.
- Valuation — estimated market value ranges both if authentic and if copy / reproduction, tied to recent auction results we fetch for you.
- Further authentication steps — specific follow-up tests recommended (dendrochronology, pigment analysis, provenance research) based on what the AI saw.
From analysis to certificate
When you're happy with the analysis, one click converts it into a
signed, QR-stamped PDF certificate. Each certificate carries
a unique HMAC-signed identifier (for example AS-473-a1b2c3d4e5)
and a QR code on every page. Anyone receiving a printed or digital copy can
scan the QR to land on our public verify page, confirm
the details, and download the server-side authoritative original to compare
against whatever they have.
If a certificate ever needs to be withdrawn, our admins can revoke it. The public verify page reflects the revocation immediately — no one can pass off a revoked certificate as valid. At 98%+ duplicate match across pixel, metadata, and semantic layers, a new certificate is automatically blocked from being issued.
Who uses AI art authentication
- Collectors screening auction lots or estate purchases before bidding or paying a specialist.
- Dealers and galleries running a first-pass check on consigned works to decide what to accept.
- Estate executors inventorying inherited artworks without a clear provenance file.
- Insurance adjusters triaging claimed artworks before sending a surveyor.
- Artists and emerging sellers who want a structured, defensible pricing estimate to share with buyers.
Honest limits of AI authentication
We are deliberately careful about what this tool is and isn't. An AI cannot touch the canvas, shine ultraviolet light on the varnish, or hold a centuries-old document against provenance records. It reads only what a photograph can reveal.
For that reason, every ArtSleuth analysis is labelled as a preliminary assessment. Our PDF certificates carry a prominent disclaimer that the analysis is not a binding legal appraisal and that a high-value or disputed artwork must be examined in person by a qualified art appraiser or recognised auction-house specialist before any sale, insurance claim, or court proceeding. That honesty is what makes the preliminary opinion useful: you know exactly when it's enough and when you need to escalate to a human expert.
Start a free authentication check
Upload one or more photos of your painting and receive a structured authentication report in minutes.
Upload your artworkFrequently asked questions
How accurate is AI art authentication?
Accuracy depends heavily on the photograph's quality and the painting. For well-lit, high-resolution images of signed works by documented artists, our attribution confidence is usually above 80%. For unsigned, poorly lit, or heavily restored pieces, the AI correctly flags a higher uncertainty. Treat the result as an informed preliminary opinion, not a legal expertise.
What is the difference between authentication and appraisal?
Authentication asks who painted this?, appraisal asks what is it worth?. ArtSleuth returns both in the same report: an attribution (with confidence) and a market valuation based on auction comparables.
Can I use an ArtSleuth report in court or for insurance?
No — and we say so clearly on every certificate. A binding legal or insurance appraisal requires an in-person inspection by a qualified, credentialed art appraiser. Our certificate is designed to support and accelerate that conversation, not replace it.
How many photos should I upload?
One well-lit, high-resolution photograph of the front is the minimum. Multiple angles (corners, close-ups of signature, back of the canvas, frame) produce a more confident assessment.
Do you store my images?
Images you submit are stored only for the project they belong to and are used solely to generate and later re-issue your PDF certificate. You can delete any project from your dashboard. We never use your images to train models.
How much does it cost?
A single analysis is available pay-per-use; a monthly Pro plan unlocks unlimited analyses. See the pricing section on the home page for current rates.