PDF Accessibility Checker and veraPDF says document corrupted

[FraBovi]

Hi everyone, I have tried your solution by tagging some PDFs, then I tried to analyze them using PAC from Axes4 https://pac.pdf-accessibility.org/en but it says that the document is corrupted and cannot be analyzed.

Also veraPDF says Failed to parse document for the validation:

[MaximPlusov]

@FraBovi Thank you for creating this discussion. Could you please send us the PDF file you're having trouble with?

[FraBovi]

I cannot share the PDF, but I tried now with one of those in the DEMO website (01030000000000.pdf) and I got errors in PAC: [image: image.png] Il giorno mer 29 lug 2026 alle ore 11:30 Maxim Pliushchov < ***@***.***> ha scritto:

…

@FraBovi <https://github.com/FraBovi> Thank you for creating this discussion. Could you please send us the PDF file you're having trouble with? — Reply to this email directly, view it on GitHub <#661?email_source=notifications&email_token=BFPSKWWF4QHXGJ3VATGPRLL5HG72FA5CNFSNUABIM5UWIORPF5TWS5BNNB2WEL2ENFZWG5LTONUW63SDN5WW2ZLOOQXTCNZYGI2TGNZWUZZGKYLTN5XKO3LFNZ2GS33OUVSXMZLOOSWGM33PORSXEX3DNRUWG2Y#discussioncomment-17825376>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BFPSKWVPACKO2ETAOFCHS5L5HG72FAVCNFSNUABIKJSXA33TNF2G64TZHM4TQMRVHA3TMMRUHNCGS43DOVZXG2LPNY5TCMBVGE3TCNRRUF3AE> . Triage notifications, keep track of coding agent tasks and review pull requests on the go with GitHub Mobile for iOS <https://github.com/notifications/mobile/ios/BFPSKWR6OO5J4NERRTZ47J35HG72FA5CNFSNUABIM5UWIORPF5TWS5BNNB2WEL2ENFZWG5LTONUW63SDN5WW2ZLOOQXTCNZYGI2TGNZWUZZGKYLTN5XKO3LFNZ2GS33OUVSXMZLOOSVGM33PORSXEX3JN5ZQ> and Android <https://github.com/notifications/mobile/android/BFPSKWQ53WWYY74FRGG2DV35HG72FA5CNFSNUABIM5UWIORPF5TWS5BNNB2WEL2ENFZWG5LTONUW63SDN5WW2ZLOOQXTCNZYGI2TGNZWUZZGKYLTN5XKO3LFNZ2GS33OUVSXMZLOOSXGM33PORSXEX3BNZSHE33JMQ>. Download it today! You are receiving this because you were mentioned.Message ID: <opendataloader-project/opendataloader-pdf/repo-discussions/661/comments/17825376 @github.com>

[MaximPlusov]

@FraBovi I don't see a screenshot in your comment - perhaps because it was sent via email.

For 01030000000000.pdf, after running auto-tagging, PAC showed me this result

There are no errors in the structure tree. Please note that correcting all PDF/UA errors is outside the scope of auto-tagging and is instead part of the Accessibility Pipeline.