Compare PDF
See exactly what changed between two versions of a PDF — word by word, page by page — without uploading either file.
Popular PDF Tools
YOYOPDF provides browser-based tools for common PDF and image tasks. Fast, easy and free.
Powerful Tools to Work with PDFs
YOYOPDF provides browser-based tools for common PDF and image tasks. Fast, easy and free.
Local by Design
Document contents stay on your device while tools process them in the browser; YOYOPDF does not upload your files.
Blazing Fast
Our tools are optimized for speed to save your time and increase productivity.
Works Across Devices
Use YOYOPDF in a modern desktop, tablet or mobile browser. No installation required.
Always Free
All tools are completely free to use. No hidden charges, no sign up needed.
Everything You Need. All in One Place.
Use YOYOPDF for common PDF and image tasks while keeping document processing on your own device.
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View all tools →Why use Compare PDF?
Two versions of the same document, and no one remembers what changed. A word-level diff answers that in seconds instead of a manual read-through.
Contract and policy review
Spot a changed figure, date or clause between drafts before signing off.
Proofing revisions
Confirm an edit round changed only what was requested — and nothing else.
Auditing submissions
Check a resubmitted document against the original to see what was actually revised.
How it works
Upload both
Add the original PDF, then the revised one. Both stay on your device.
Diff
Each page pair is compared word by word in your browser.
Review
Scroll the synchronised side-by-side view; changed pages are flagged and changes highlighted.
Key features
Word-level highlighting
Added words and removed words are marked in place, not just whole changed lines.
Synchronised scrolling
Both panes scroll together, so the same page stays in view on both sides.
Change summary
Totals for added and removed words, plus a count of changed pages, up front.
Page-by-page
Each page pair is its own section, so long documents stay navigable.
Who uses Compare PDF?
Reviewing a new draft
Verify exactly what an author or counterparty changed in the latest version.
Checking a correction
Confirm a requested fix landed and no surrounding text shifted.
Version control for documents
Record what changed between archived versions of a policy or report.
Frequently asked questions
Are my PDFs uploaded to compare them?
No. Both files are read and diffed locally in your browser — nothing leaves your device.
What counts as a change?
Added and removed words, highlighted in place on each page, with a summary of totals and which pages changed.
Why do scanned pages show no differences?
Comparison reads selectable text. Scanned, image-only pages have no text layer to compare, and this site has no OCR.