Verify a contract revision
Compare the draft you sent with the version that came back and see exactly which pages were touched before signing.
Files never leave this device
Version comparison
See exactly what changed between two PDF versions.
Open version A and version B and see which pages changed, how many words were added and removed, and how similar the documents are — side by side, without uploading either file.
Reading files…
What it solves
Know which pages changed — before you sign or publish.
This tool compares the text of both documents on this device. It lists which pages changed, counts added and removed words, gives a similarity percentage and lets you jump between changed pages with both versions side by side, scrolled in sync. Neither file leaves the browser.
The comparison reads extractable text. Scanned pages without a text layer cannot be compared — recognize them with OCR first — and purely visual changes such as images or layout are not detected.
Common uses
Make an archive of scans usable
Recognize the text of English or Spanish scans and export searchable copies you can quote and search.
Pre-check a publication
Run the four accessibility checks on a report before sending it to specialist review, and fix the obvious blockers first.
Quick guide
From a closed document to clear answers.
- 01Open the PDF you want to understand; for a comparison, add both versions.
- 02Choose what to run: the text comparison, the recognition language and pages, or the four accessibility checks.
- 03Run the analysis and follow the progress page by page, on the pages themselves.
- 04Read the verdict on screen and, if you need it, download the text or the report as a file.
Limits worth knowing
Honest about what analysis can see.
- 01
The comparison reads extractable text: scanned pages without a text layer cannot be compared, and purely visual changes such as images or layout are not detected. Recognize scans with OCR first.
- 02
Text recognition currently offers English and Spanish, up to 20 pages per run — a deliberate limit so the device's memory is not exhausted — and its quality depends on the quality of the scan.
- 03
The accessibility result is a practical pre-check, not a PDF/UA or WCAG certification; a compliant publication still needs specialist validation.
- 04
Everything runs on this device, so very large documents are limited by the browser's memory, and every result is a new download that never overwrites the original.
Frequently asked questions
Comparing PDFs — FAQ.
01Does this tool upload my PDF?
No. The analysis runs in the browser and the recognition models are served from this site, so the document bytes never leave the device or reach any server.
02Why does it find nothing on scanned pages?
A scan is a photograph of a page: there is no text layer to read. Run OCR first to add one, then compare or check the recognized copy.
03How reliable is the recognized text?
It depends on the scan: clean, straight, high-resolution pages read well, while faint or skewed ones lower the per-page confidence the tool shows. Review the result before relying on it.
04Is the accessibility result an official certification?
No. It checks four practical prerequisites — tags, language, title and scan-only pages — and full PDF/UA or WCAG conformance requires specialist validation and manual review.
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Select pages visually or enter ranges, then export only those pages as a separate PDF without uploading the original.
Open toolShare this tool
Referencing this tool on a website?
Copy an attribution link. It is optional and does not change free access.