PDF Compare

Compare two PDF documents side by side with visual difference overlay and highlighting. Spot changes between versions instantly. Free online PDF comparison tool.

Local · instant · nothing uploaded

Report an issue

About PDF Compare

Compare two PDF documents side by side with visual difference overlay and highlighting. Spot changes between versions instantly. Free online PDF comparison tool. PDF Compare is a powerful, free online tool built for students, professionals, and businesses working with documents. It's part of ToolHaven's PDF Tools collection — a suite of browser-based utilities designed to help you work faster without compromising your privacy.

Unlike cloud-based alternatives, PDF Compare processes everything locally on your device. Your files are never uploaded to any server — making it ideal for sensitive or confidential work. There are no file size limits imposed by server bandwidth, and results appear instantly without network delays.

Whether you need to compare, diff, side by side, PDF Compare handles it with ease. No account required, no software to install — just open the tool in any modern browser (Chrome, Firefox, Safari, Edge) on desktop, tablet, or mobile and start working immediately.

How to use

Upload your PDF to PDF Compare by dragging it into the upload area, or click "Choose File" to browse. Compare two PDF documents side by side with visual difference overlay and.... Your file stays on your device — nothing is uploaded to any server.

Configure PDF Compare's options shown above to customize your result. The tool processes everything locally in your browser with no delay.

Download your PDF Compare result by clicking the download button. The output is generated in your browser — your original file is never modified or stored.

Use cases

When people reach for PDF Compare.

Preparing tax documents, invoices, or contracts for email or upload
Combining multiple scanned pages into a single, organized PDF
Stripping sensitive metadata or pages before sharing externally
Compressing large reports for upload-size-limited portals (legal, government, banking)

Tips

Things worth knowing.

Compress AFTER editing, not before — re-encoding twice degrades quality.

Split first if you only need to share a few pages; merging back later is rarely needed.

Watermark before flattening — flattened PDFs can't be un-watermarked easily.

Remove blank pages from scans to keep file size and page counts honest.

Questionsanswered straight

Questions about pdf compare.

01How does PDF Compare work?+

Compare two PDF documents side by side with visual difference overlay and highlighting. Spot changes between versions instantly. Free online PDF comparison tool. PDF Compare runs entirely in your browser using JavaScript — your files are never uploaded to any server. The processing happens locally on your device, which means it's both fast and private.

02Is PDF Compare really free?+

Yes, PDF Compare is 100% free with no hidden costs. There's no login required, no account to create, no trial period, and no premium tier. You can use it as many times as you want.

03Is it safe to use PDF Compare with my files?+

Absolutely. PDF Compare processes everything locally in your browser. Your files never leave your device — we have no server that could receive or store it. You can verify this by checking the Network tab in your browser's Developer Tools (F12) while using the tool.

04Does PDF Compare work on mobile devices?+

Yes, PDF Compare is fully responsive and works on smartphones and tablets. The interface adapts to your screen size, and since all processing happens in your browser, it works on any device with a modern web browser.

05What happens to my files after I use PDF Compare?+

Nothing — your files are never uploaded anywhere. PDF Compare processes files in your browser's memory. Once you close or refresh the page, the data is gone. We have no way to access, recover, or view any files you use with this tool.

More pdf tools

Merge PDF

Combine multiple PDF files into a single document with drag-and-drop reordering. Merge reports, contracts, or invoices in seconds. Free online PDF merger — no file size limits.

PDF Tools

Split PDF

Split a PDF into individual pages or extract custom page ranges into separate files. Organize your documents easily. Free online PDF splitter — works entirely in your browser.

PDF Tools

Compress PDF

Reduce PDF file size by stripping metadata and optimizing content. Ideal for email attachments and faster uploads. Free online PDF compressor — no data leaves your browser.

PDF Tools

Rotate PDF

Rotate all or selected PDF pages by 90, 180, or 270 degrees. Fix scanned documents with wrong orientation instantly. Free online PDF rotation tool — fast and private.

PDF Tools

Delete PDF Pages

Remove unwanted pages from any PDF document. Select individual pages to delete with visual thumbnails for easy identification. Free online PDF page remover tool.

PDF Tools

Extract PDF Pages

Extract selected pages from a PDF and save them as a new file. Choose individual pages or custom ranges with preview. Free online PDF page extractor — no signup required.

PDF Tools

Add Watermark to PDF

Add custom text watermarks to every page of your PDF with full control over opacity, font size, color, and rotation angle. Free online PDF watermark tool — protect your documents.

PDF Tools

Add Page Numbers

Add page numbers to your PDF with customizable position (top/bottom, left/center/right), numbering format, and font size. Free online PDF page numbering tool.

PDF Tools