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pdfGoHTML

Free Acrobat plug-in that renders a tagged PDF as structured HTML, so a person can judge its accessibility and tagging.

Jobs Accessibility

Operated by callas software GmbH

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Jobs covered

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Accessibility Browse all accessibility tools

inspecting an existing tagged PDF's accessibility structure with pdfGoHTML: converting it to a structured HTML representation with views for the default rendering, structure tags, easy-reader, inverted, low-vision and dyslexia-friendly presentation; checking whether the file is tagged; and supporting human review of tag structure, language, content order and where tagging needs work, including archival workflows that require structural information.

The scope records visual/human inspection and structure preview only; it explicitly does not validate PDF/UA or WCAG, produce a conformance result, remediate or edit tags, certify accessibility, replace screen-reader testing or guarantee legal compliance

Where your files are processed

No server involved

An Acrobat plug-in: the PDF is opened and converted to HTML inside your own copy of Acrobat, on your own machine. The account the vendor requires gates the download, not the processing.

An Adobe Acrobat plug-in that inspects/converts the open document inside Acrobat on the machine running it. The account requirement is for obtaining the download; nothing in the documentation establishes that signing in is needed while the plug-in processes a document, and the record does not claim that no data is transmitted.

Acrobat host edition/version and licence prerequisites remain to verify for a given environment.

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 default view, one that exposes the structure tags, an easy-reader view, and 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. The current release is 2.2.032 (4 September 2025), a free Acrobat plug-in for Windows and macOS; obtaining the download requires an account, but the inspection runs inside Acrobat on the local machine.

It is not a validator or a remediation tool.

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 on Windows or macOS, and it is one of the few free tools 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, so this record does not claim that signing in is needed while the plug-in inspects a document. It does not remediate tags, validate PDF/UA/WCAG, certify accessibility or replace a screen-reader test.

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 to obtain the download link.

Free to download and use; an account is required to obtain the download link. The current product page describes pdfGoHTML as a free Acrobat plug-in; the account gates the download, not document inspection.

Proprietary freeware, not open source; no source licence is offered.

Redaction
No redaction feature
Programmatic access
None
Last availability check
Responded in 675 ms 21 October 2026

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

What the redaction verdict rests on

From the vendor's own documentation, read 22 September 2026. Not tested by us.

What that does not establish

Recorded as `none` on absence: the product page describes converting tagged PDF into HTML for inspection, with several display views, and never mentions redaction or removing content. This is the easiest absence in the batch to be confident about, because the tool writes HTML and does not write PDF at all - there is no output document in which content could be left behind.

What it does not establish: anything about the other callas products, which are separately licensed and separately recorded.

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

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.”

    Reported by the vendor Read 16 October 2026

    Current and exact on the product page, but retained as a reported vendor statement because no fresh evidence file was archived in this pass. It is the vendor's rationale for human structure inspection, not an automated conformance claim.

    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

    Re-read the current product page on 2026-10-16; the sentence is present in the accessibility description.

    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.

Sponsorship is distribution, not an endorsement or a promise of search rankings, AI citations, traffic, or sales. This listing is a free entry, compiled from published sources.

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Related reading

How this record was put together

Editorial review.
No editor has signed this record off. That is not the same as nothing having been checked, and the lines below say what has.
Source reading.
1 claim taken from the vendor's own pages, read between 16 October 2026 and 16 October 2026.
Website availability.
The vendor's site was last checked on 21 October 2026.
Behaviour testing.
We ran this ourselves. The file handling was watched directly.

Sources: https://callassoftware.com/products/pdfgohtml/ (free Acrobat plug-in, inspection/structured HTML, account-gated download; read 2026-10-16); https://callassoftware.com/products/pdfgohtml/system-requirements/ (system-requirements page; download/account; read 2026-10-16); https://callassoftware.com/version-history/ (pdfGoHTML 2.2.032, 4 September 2025; Windows/macOS fixes; read 2026-10-16); https://callassoftware.com/callas-downloads/ (downloads; read 2026-10-16).