PDF Tools
Compare PDF
See the text differences between two versions of a PDF.
- Free to use
- No sign-up
Text-level comparison only — catches wording changes, not purely visual edits (moved images, re-colored text) with identical wording.
Your file is processed securely and automatically deleted from our servers within 1 hour.
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About this tool
Spot what changed between two versions of a document without reading both line by line. Upload the original and the revised copy, and the tool highlights every addition and removal in the text.
How to use it
- Upload the original as the first file.
- Upload the revised version as the second.
- Run the comparison and review the highlighted differences.
Reading the results
- Added – text that appears only in the revised version.
- Removed – text that was in the original but is gone now.
- Identical – shown when nothing in the text changed.
When it helps
- Checking a contract or agreement returned by the other party
- Reviewing edits to a policy, proposal or thesis
- Confirming that only the agreed corrections were made
- Comparing two drafts of a report before publishing
What it does not detect
The comparison works on extracted text. Changes to images, fonts, colours or layout are not reported, and scanned documents need text recognition (OCR) first because their words are stored as pictures.
Privacy
Both uploads are used only for the comparison and are deleted from our server shortly afterwards.
A worked example
A freelancer sends a contract to a client, who returns a "final" version a week later. Comparing the two shows that the payment terms changed from 14 to 30 days and a cancellation clause was added — changes that were not mentioned in the client's email.
Getting accurate results
- Always put the original first and the revision second, so additions and removals are shown the right way round.
- Compare digital files rather than scans whenever possible.
- If a document was reflowed, many lines may appear changed; focus on the highlighted words within them.
Review routine for contracts
- Compare every returned version, even if no changes were mentioned.
- Pay special attention to dates, amounts, names and obligations.
- Ask the other party to confirm any change you did not agree to.
- Keep both versions and the comparison result for your records.
Visual changes
Logos, colours and layout are not compared. Open both versions side by side if design changes matter.
Related tools
- PDF to Word – edit text after reviewing changes
- Add Watermark – mark drafts clearly
- Sign PDF – sign the agreed version
Step by step: reviewing a returned contract
- Save the version you sent and the version you received with clear names.
- Upload the sent version first and the returned version second.
- List every highlighted change in an email.
- Ask the other party to confirm or explain each one.
- Sign only the version you have both agreed.
Keeping a written record of differences protects both sides and avoids disputes later.