Compare PDFs
Side-by-side page previews of two PDFs with synced page index.
Runs in this tab. The file stays here.
About Compare PDFs
Side-by-side rendered page previews of two PDFs with a synced page index — visual compare, offline.
Two versions of a board pack; you want to flip pages together and look. Compare loads exactly two PDFs, renders with PDF.js, and keeps a shared page index with prev/next.
This is visual only — not a textual diff, not a pixel heatmap download, not “highlight changes in red.” For text diffs, copy out with Extract text and use the Text diff tool. For image pixel diffs, use Compare under images.
Nothing is uploaded. There is no merge output from this view — Merge is a different job.
How to use Compare PDFs
- 1Drop exactly two PDFs.
- 2Flip pages with the synced control.
- 3Look — export is not part of this tool.
What it won't do
- Visual only — no diff export.
- Exactly two PDFs.
Common questions
Does it highlight textual differences?
No. Side-by-side previews only. Extract text + Text diff if you need word-level changes.
Can I compare more than two files?
Not on this page. Two inputs, synced pages.
Are the PDFs uploaded?
No.
Related tools
Why this one doesn't upload your file
There is no server to upload to. This page is a static file, and the work happens in your browser using the same graphics and WebAssembly code that renders every other site you visit. Your file is read from disk into memory, processed, and handed back as a download. Once the page has loaded you can disconnect from the network entirely and it keeps working. The longer explanation