pdfGoHTML

What it does

pdfGoHTML opens a PDF, says immediately whether it is tagged, and converts it to HTML so you can see the structure rather than infer it. The exported page has several views — the browser's default, one that exposes the structure tags, an easy-reader view, inverted, low-vision and dyslexia-friendly presentations — and the structure-tags view is the interesting one: it shows where the tagging needs work. It is the tool for the half of accessibility that no checker can do, because a document can pass every automated test and still be unusable to a screen reader.

Best for: Anyone who has to decide whether a document's tagging is meaningful rather than merely present: accessibility specialists reviewing a supplier's output, and teams who have run a checker, been told the document passes, and still want to see what a reader would actually get.

Worth knowing: It is an inspection aid, not a validator. It does not check a document against PDF/UA or WCAG and it will not tell you whether a document passes anything — it shows you the structure and leaves the judgement to you, which is the point but also the limit. It only becomes useful on a tagged PDF: it indicates whether a file is tagged, and an untagged scan gives it nothing to inspect, so it is not a starting point for remediation. It is an Adobe Acrobat plug-in, so it needs Acrobat installed, and it is one of the few free things here that still requires an account: the download link is behind a sign-up. The account requirement is about obtaining the download rather than about running it: nothing in the documentation establishes that signing in is needed while the plug-in inspects a document, so the field says what it can support and no more.

Details, and where each comes from

Vendor statements, our own reading of their pages, and the things nobody has established yet, each answered separately. Where we have not confirmed something it says so rather than guessing, and a row nobody has established is greyed out.

Versions covered

Windows · macOS

Website

callassoftware.com

Requires an account

Yes

Watermark on the free tier

Not verified

Maximum file size

Not verified

Batch processing

Not verified

Data residency

Self-hosted

Open source

No

Self-hostable

Yes

Licence

Free to download and use; an account is required for the download link

Redaction

No redaction feature

Programmatic access

None

Last availability check

Responded in 352 ms 16 October 2026

Checked automatically by our own runner, not reported by the vendor. 100% of our last 30 checks got a response.

What the vendor says

Claims are labelled rather than repeated as fact. Where we have checked something ourselves, it says so and shows when. Checked means we read the vendor's own page and it says what we recorded — not that we tested the behaviour, unless the note says we did.

• “Technical compliance alone is not sufficient if structure, language, or reading order do not reflect how humans read content.”

  Checked by us — the source says this Read 1 October 2026

  Confirmed. The quoted text appears in the rendered page as read on 2026-10-01. This claim was carried as reported rather than checked until this read.

  Standing: Not re-read against the live source

  Check it yourself: the source, the SHA-256, and how we checked

  Read

  https://callassoftware.com/products/pdfgohtml/

  From

  the text a browser renders

  SHA-256

  64ee50634953815032642a2c7f2a5eb9943bdb7758764a0de15328442c27b411

  How we checked: Read as rendered text in headless Chrome on 2026-10-01 and saved to the evidence archive, so the read can be repeated against the same file. Comparison ignores case, punctuation and hyphenation, which is why "open-source" on the record matches "open source" on the page.

  What this hash proves, and what it does not

Each claim is quoted from the vendor's own pages. This section describes what we have and have not checked — it is not a judgement about anyone.