Compare PDF
Compare PDF lets you quickly see differences between two PDF documents, and it’s completely free. Use it to spot added or removed text without any registration or watermarks.
FreeNo sign-upNo watermarkFiles stay on your device
How Compare PDF works
When you drop your original and revised PDFs into the browser, the tool extracts the text from each page. It then lines up the pages and highlights new words in green and deleted words in red with strikethrough. A summary shows how many pages changed and the total words added or removed. All processing happens locally, so nothing leaves your device.
How to compare a pdf
- 1Add the original and the new version
- 2Text is compared page by page
- 3Review the highlighted changes
Features
- Highlights added words in green
- Shows removed words in red with strikethrough
- Counts changed pages and word differences
- Runs entirely in your browser
- No sign-up or watermarks
- Works on phones and computers
Useful for
- Checking revisions in tender bid PDFs
- Comparing updated school admission forms
- Verifying changes in invoice PDFs
- Reviewing contract amendments before signing
Questions
Compare PDF: common questions
Is Compare PDF free?
Yes, Compare PDF is completely free to use. There are no hidden fees, subscription charges, or limits on how many files you can compare.
Are my files safe when I use Compare PDF?
Your files never leave your device. All processing occurs inside the browser, and nothing is stored once you close the tab, ensuring complete privacy.
Does Compare PDF work on a phone?
Yes, the tool works in modern mobile browsers. You can upload PDFs from your phone and view the differences just as you would on a desktop.
What file size can I compare?
You can compare any PDF that your device’s memory can handle. Very large files may be slower or may not load on low-end devices.
Does the tool compare images or only text?
It only compares the extracted text. Images, graphics, and other non-text elements are ignored, so only textual changes are highlighted.