Compare PDF Files
See what text changed between two versions.
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About Compare PDF
Compare PDF shows you what text changed between two versions of a document. Add the old file and the new file, and the tool points out the words that were added, removed or changed. You do not need to read both files line by line. The comparison runs in your browser, so your files are not uploaded.
It is useful when someone sends back a contract, rent agreement or offer letter and you want to check what they edited. Students can compare two drafts of a thesis, and office teams can check a new version of a policy or price list before they approve it.
How to use Compare PDF
- Upload the original PDF and the new version.
- Let the tool compare the text in both files.
- Review the highlighted changes.
Why use PDF Hydra
- Spot every text changeSee words that were added, removed or changed between two versions.
- Saves reading timeFocus only on the parts that changed instead of rereading the whole file.
- Good for contractsCheck edits to agreements and letters before you sign them.
- Both files stay privateThe comparison happens in your browser and neither file is uploaded.
Frequently asked questions
How do I compare two PDF files?
Open Compare PDF, add the old version and the new version, and the tool shows the text differences between them.
Does it compare pictures and layout?
Compare PDF looks at the text. It shows which words changed, not changes to images or design.
Can I compare scanned PDFs?
A scanned page is a picture, so it has no text to compare. Run each file through PDF OCR first to get readable text.
Are my files uploaded?
No. Both files are compared inside your browser and stay on your device.