How does the comparison work?

Both PDFs are rendered page by page as images via pdf.js, then displayed side by side. An overlay mode lets you visually detect differences.

Are my files private?

Yes, processing is 100% local in your browser. No files are sent to any server.

No, but very large PDFs may slow down rendering in the browser.

🇬🇧WebFileTools/Compare Two PDFs

Visualize differences between two PDFs side by side or in overlay mode. 100% browser-based.

100% browser-based — no file uploaded.

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PDF A

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PDF B

The PDF comparison tool displays two documents side by side page by page, with an overlay mode to visually identify differences between versions.

Import two PDFs, navigate page by page to compare them side by side. Enable overlay mode to see differences in transparency.

How does the comparison work?: Both PDFs are rendered page by page as images via pdf.js, then displayed side by side. An overlay mode lets you visually detect differences.
Are my files private?: Yes, processing is 100% local in your browser. No files are sent to any server.
Is there a page limit?: No, but very large PDFs may slow down rendering in the browser.

Compare two texts and visualize differences line by line. Additions, deletions, modifications. Free.

Compare two images side-by-side with a before/after slider. Ideal for checking compression or edits. Free.

Combine multiple PDF files into a single document online. Drag and drop, reorder, and download the merged PDF. Free.