The free Compare PDF tool shows you exactly what changed between two versions of a document. Upload both files and the tool compares their text and highlights the additions, deletions, and changes side by side, so you can see every difference without reading the two documents line by line. It also produces a visual comparison of the pages. It is free, adds no watermark, and needs no account.
This is a real text comparison, not just an image overlay. The tool reads the actual text of both files and marks precisely which words were added, removed, or altered, which is what you need when the differences are in the wording rather than the appearance.
How to Compare Two PDFs
- Upload both PDFs. Select the two versions you want to compare, or drag them onto the upload area.
- Compare. The tool reads the text of both files and finds the differences.
- Review and download. See the changes highlighted side by side, with a visual page comparison alongside.
Seeing Every Change
Comparing two versions of a document by eye is slow and easy to get wrong, especially in a long contract or report where a single changed number matters. This tool does it precisely: it lines up the text of both files and marks every addition, deletion, and edit, so nothing slips past you. It works on PDFs with selectable text. If both files are scanned images with no text layer, the text comparison has nothing to read, so the tool falls back to the visual page comparison to show where the pages differ.
Is My File Safe?
Your files are handled securely. Uploaded PDFs are deleted from our servers immediately after processing, whether it succeeds or fails. The result is stored under a random, unguessable name and stays available to download for up to two hours, then it is automatically and permanently deleted. All uploads and downloads use a secure HTTPS connection.
When to Compare PDFs
- Reviewing contract changes. See exactly what was altered between two drafts of an agreement.
- Checking document versions. Confirm what changed between an old and a new version of a file.
- Proofreading edits. Verify that only the intended changes were made.
- Auditing a revision. Track precise differences for a record or approval.
Related PDF Tools
If a file is scanned, run OCR first so its text can be compared. You can also edit text in a PDF or merge documents.
