๐ PDF Compare
PDF Compare shows two PDFs side by side with synchronized scrolling, so page-by-page differences between a contract draft and its revision stand out as you scroll. It is a visual review tool โ there is no automated text diff โ and files with different page counts are handled by showing what it can. Both documents stay in your browser.
- PriceFree, no signup
- InputTwo PDFs
- UploadNever โ local
- OutputVisual side-by-side view
Reviewing two PDF revisions
| Difference type | How it shows up | Fallback |
|---|---|---|
| Rewritten clause | Visible when you scroll to the page | Zoom in and read line by line |
| Moved or resized layout | Offset text on the paired page | Check where page numbers diverge |
| Added or removed page | Page counts stop matching | Note where the shift begins |
| Scan versus digital copy | Both render as page images | Visual only โ no text extraction |
| Metadata-only change | Invisible here | Compare file properties instead |
| Machine-readable diff needed | Not this tool | Export text and run Text Diff Checker |
PDF A (Original)
Click to select
PDF B (Modified)
Click to select
Detailed User Guide
Spot the differences between two PDFs
The compare tool highlights what changed between two versions of a document, page by page. It is built for reviewing revisions of contracts, reports, and agreements.
Upload both files and see a diff
Provide the original and the revised PDF; the tool aligns pages and flags areas that differ so you can focus on the changes.
Best for text and layout changes
Comparisons work well for textual and layout differences. For pixel-identical scans, differences are harder to detect, so use a text-based source when possible.
Local processing protects sensitive documents
Both files are compared in your browser, so nothing is uploaded. This matters for legal and financial documents.
Review before you act
The output is a visual diff to help you understand changes โ it does not merge or edit either file.
Ideal for contract and revision review
When two parties exchange versions of an agreement, the diff shows exactly which clauses were added, removed, or rewritten, so nothing slips through unnoticed during negotiation.
Compare text-based PDFs for best results
Digitally created PDFs with a text layer produce the clearest diffs. Scanned image-only documents are compared visually, which is less precise โ run OCR first if you need exact text-level differences.
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Frequently Asked Questions
PDF Compare: Compare two PDFs side by side
PDF Compare lets you compare two pdfs side by side. Upload two PDFs and get a page-by-page comparison โ all processed locally in your browser, with no uploads and no sign-up.
Spot differences between contract versions
Spot differences between contract versions. This is one of the most common reasons people reach for PDF Compare โ and it handles the job in seconds, entirely in your browser.
Compare revised and original documents
Compare revised and original documents. This is one of the most common reasons people reach for PDF Compare โ and it handles the job in seconds, entirely in your browser.
Verify changes across PDF drafts
Verify changes across PDF drafts. This is one of the most common reasons people reach for PDF Compare โ and it handles the job in seconds, entirely in your browser.
Everything You Need in a PDF Compare
Powerful features that make PDF Compare fast, private, and free.
Instant Processing
PDFs are processed in your browser the moment you upload.
100% Private
Your PDFs never leave your device โ no server uploads.
Text-Based Output
Conversions produce real, searchable, selectable text.
All-in-One PDF Suite
Merge, split, edit, annotate, convert โ 25+ PDF tools.
Free Forever
No sign-up, no watermarks, no page limits.
Cross-Platform
Works on Windows, Mac, Linux, iOS, and Android.
How to Use
Upload both PDF versions
Add the original and the revised document. The tool will align them page by page.
Run the comparison
The tool highlights areas that differ between the two versions, so you can focus on the changes.
Review the diff
Step through the highlighted differences to understand what changed in the revision.
Act on the result
The output is a visual diff to help you review changes โ it does not merge or edit either file.