What does the changed percentage mean?

It is the share of rendered pixels on the selected page whose colour differs beyond a small tolerance.

Can it compare every page at once?

Text is compared across the full documents, while the visual map focuses on the page number you choose.

Will font rendering create differences?

PDFs are rendered by the same browser engine, which limits false differences, though changed page dimensions can still affect alignment.

PDF Tools

Compare PDFs

Compare two PDF files with original, changed and visual-difference previews.

Free foreverRuns in your browserNo sign-up

Original PDFChanged PDF

Page

About the Compare PDFs

Compare PDFs renders the same page from two documents and produces a red visual-difference map. It also compares extracted text across the complete files.

Use it for revised contracts, reports, proofs and exported documents where small visual or wording changes can be difficult to spot manually.

Key features

Side-by-side page previews
Pixel-level difference map
Extracted text comparison
Local private processing

How to use

1Choose the original and changed PDF files.
2Enter the page to inspect and start comparison.
3Review both previews, the red difference map and the change summary.

Examples

Check a revised proposal

Input: Original PDF plus revised PDF

Output: Three previews and changed-pixel percentage

Inspect pages with reported text changes individually for the clearest visual result.

Frequently asked questions

What does the changed percentage mean?: It is the share of rendered pixels on the selected page whose colour differs beyond a small tolerance.
Can it compare every page at once?: Text is compared across the full documents, while the visual map focuses on the page number you choose.
Will font rendering create differences?: PDFs are rendered by the same browser engine, which limits false differences, though changed page dimensions can still affect alignment.