Compare PDF
Show the differences between two versions of a document.
or drag and drop PDFs here
Files are processed on your device and never uploaded.
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To compare two PDFs, select the original and the new version. Every added word is highlighted in green and every removed word in red, side by side, with a list of all changes. Switch to Visual overlay to spot layout or image changes, then download a comparison report as PDF.
How to compare PDF
- Select your PDF filesClick “Select files” or drop your PDF files on the page.
- Choose your optionsSelect the original first, then the changed version (or use Swap).
- Click “Download report”The result is created on your device in seconds and downloads automatically.
Frequently asked questions
Can I compare scanned PDFs?
Use Visual overlay: it compares the pages pixel by pixel. Text comparison needs real text, so run OCR PDF first for word-level changes.
Does it work with documents in other languages?
Yes. Any language with text in the PDF, including Chinese, Arabic and Thai, can be compared.
Is Compare PDF free?
Yes. Compare PDF on HappyPDF is completely free: no sign-up, no watermark and no daily limit.
Are my files safe?
Yes. Your files are processed inside your own browser and are never uploaded to HappyPDF’s server,, so nobody else can see them.
Does it work on phone, Mac and Windows?
Yes. It works in any modern browser (Chrome, Safari, Edge, Firefox, Samsung Internet) on Windows, macOS, Linux, Android and iPhone/iPad. Nothing to install.