Compare PDF Files Free - See Exactly What Changed Online
Upload two versions of any PDF and instantly see every addition, deletion, and modification highlighted side by side. Works entirely in your browser. No upload, no account.
Compare two PDF documents side by side to instantly see what changed. Text differences are highlighted in color - additions in green, removals in red - with a summary of total changes.
What is Compare PDF?
Comparing PDF files manually - reading two versions side by side - reliably misses small edits: a changed number, a reworded clause, a swapped date. This PDF comparison tool processes both documents and highlights every difference automatically. Upload the original and revised PDF, click Compare, and additions appear in green, deletions in red across a synchronized side-by-side view.
Word-level precision means partially reworded lines show exactly which words changed, not just that the line is different. A contract revision that changes "30 days" to "45 days" flags the specific numbers, not the entire sentence - making it easy to catch the edits that matter without reading every word.
The Changes panel on the left lists every modification with a short preview and page number. Click any item to jump directly to that change without scrolling through the full document. Long unchanged sections collapse automatically so the view focuses on what actually differs between the two files.
After review, export a full comparison report as a plain text file or a formatted PDF - useful for audit trails, legal review records, and approval workflows where a documented diff is required.
Common uses: reviewing contract revisions before signing, verifying a published document matches an approved draft, checking what changed between two versions of a compliance policy, and auditing configuration changes before applying them.
Processing happens entirely in your browser. Neither document is uploaded to any server - essential for confidential contracts, legal filings, and financial statements.
Powerful Features
Everything you need in one amazing tool
Side-by-Side Comparison
Both documents display together in synchronized panels. Scroll one and the other follows automatically.
Word-Level Highlighting
On partially changed lines, the exact words added or removed are highlighted, not just the whole line.
Change List Panel
A sidebar lists every change with a short preview and page number. Click any item to jump straight to it.
Collapse Unchanged Sections
Long identical passages are folded away automatically so you can focus on what actually changed.
Download Comparison Report
Export the full diff as a plain text file or a formatted PDF report for audit trails and records.
Fully Private, No Upload
Both PDFs are processed inside your browser. No content is ever sent to any server.
How It Works
Get started in 4 easy steps
Upload Both PDFs
Drop or select the original PDF and the revised version. Both load directly in your browser.
Click Compare
The tool reads the text from both documents and calculates every addition, deletion, and change.
Review the Differences
Green highlights show added text, red shows removed text. Word-level marks pinpoint exact changes within a line.
Export the Report
Download a text or PDF report of all changes for your records, audit trail, or team review.
Why Choose Our Compare PDF?
Stand out from the competition
Completely Private
Documents never leave your browser. No servers, no uploads, no data stored. Safe for contracts and legal files.
Word-Level Precision
Finds the exact word or phrase that changed within a line, not just which lines are different.
Jump to Any Change
The sidebar change list lets you navigate directly to each difference without scrolling the whole document.
Page Numbers on Every Change
Each highlighted difference shows which page it is on so you can locate it in the original file.
PDF and Text Export
Get a formatted PDF report or a plain text diff file to share with colleagues or keep on record.
Free, No Account Required
Completely free with no sign-up, no subscription, and no watermarks on any exported reports.
Perfect For
See how others are using this tool
Contract and Agreement Review
Compare the original draft to the final signed version and instantly see every clause that was added, removed, or reworded.
Compliance and Policy Audits
Verify that updated policy documents contain only the approved amendments and nothing unexpected was changed.
Editorial and Manuscript Review
Track edits between drafts without relying on version history. Instantly spot every revision an editor or author made.
Technical Documentation Updates
Find what changed between two versions of a specification, manual, or API reference document.
Financial and Report Revisions
Check amended financial statements or board reports for any figures, sentences, or sections that were quietly changed.
Academic Paper Revisions
Review peer-review revisions or compare a submitted paper against the final published version.
Frequently Asked Questions
Everything you need to know about Compare PDF
The comparison works on the text layer of a PDF. Scanned PDFs are images and have no text layer, so they will show as blank. Use the PDF OCR tool first to extract text from a scanned PDF, then compare the resulting file.
The tool compares the text content of both PDFs. Changes to images, fonts, layout, or visual formatting that do not affect the text are not highlighted.
No. Both PDFs are processed entirely inside your browser. No content is sent to any server, and nothing is stored anywhere. Your documents stay completely private.
The tool handles mismatched page counts. Text that only appears in one document is flagged as added or removed accordingly.
Yes. You can download a plain text diff file for quick reference, or a formatted PDF report that shows all additions and removals with color coding for sharing or record-keeping.
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