Compare PDF Files Online
Show a side-by-side comparison of two PDF files. Free, secure, and works on any device — no signup required.
Compare PDF shows two versions of a document side by side with changes highlighted — added text in one color, removed text in another, moved sections marked. Lawyers use it to spot redline edits in contracts, designers to verify spec changes, and engineers to check that a final report matches the approved draft.
Original (A)
or drop PDFs here
Modified (B)
or drop PDFs here
Free account keeps your last 30 jobs (filename + tool only — never your files) so you can re-find them later.
🔒 HTTPS · Browser-side processing · 100% free
How to Compare PDF
- 1
Upload your file
Click "Select PDF files" or drag and drop the document into the upload box. Multiple files are supported where it makes sense.
- 2
Configure options
Pick the settings on the right — the defaults work for 90% of jobs, so most users can skip straight to the next step.
- 3
Click "Compare PDF"
PDFWix processes the file instantly in your browser. No upload progress bar, no waiting.
- 4
Download the result
Save the new file to your device. The original file is never modified.
Tips for compareing PDFs
Same source matters
Comparing a Word-exported PDF to a scanned PDF won't work cleanly — OCR introduces noise. Compare same-format files.
Page-by-page sync
If pages were inserted, the comparison may misalign. Use Organize PDF to sync structures first.
Text-only mode for big files
Visual diff is slow on 200+ page PDFs. Switch to text mode to highlight content changes only.
OCR scans first
If one version is a scan, run OCR PDF so text is comparable, not just pixels.
Export the diff report
Save the comparison as a third PDF — useful for circulating to stakeholders who weren't in the call.
Why use PDFWix to compare PDFs?
- Completely free. compare as many PDFs as you need without paying a cent or hitting a paywall.
- No signup required. Skip account creation. Just upload, compare, and download.
- Works on any device. Whether you're on Windows, Mac, Linux, iPhone, or Android — PDFWix runs entirely in your browser.
- Privacy first. Your files are encrypted in transit and automatically deleted from our servers within an hour.
- Lightning fast. Most compare jobs finish in under 10 seconds, even for large files.
- Preserves quality. Text, images, and formatting stay exactly as they were in the original PDF.
Common uses for compareing PDFs
- Compare PDF for monthly reports and expense filings
- Compare PDF for academic papers and references
- Compare PDF for contracts and signature workflows
- Compare PDF for ebooks and training manuals
- Compare PDF for tax documents and accountant submissions
Frequently asked questions
Is the PDFWix compare pdf tool really free?
Yes. Compare PDF is 100% free, with no hidden charges, no signup, and no watermarks added to the output.
Are my files safe when I use Compare PDF?
Most processing happens directly in your browser, so your file never reaches our server. When server processing is required, files travel over HTTPS and are processed in memory only — never written to disk.
Will Compare PDF reduce the quality of my document?
No. PDFWix preserves the original quality of your file, including text, images, fonts, and formatting.
Can I use Compare PDF on mobile?
Absolutely. PDFWix works on any device with a browser — phones, tablets, laptops, or desktops. No app installation required.
Do I need to create an account?
No. You can use every PDFWix tool without signing up. An optional free account just keeps a history of your conversions (filename and tool only).