Diffchecker
Compare two versions of a document or block of text and highlight exactly what changed.
Cost
Free to start, paid to go further
Text comparison is free in the browser. PDF and image comparison and larger files need the paid tier.
Open source
No
The code is private. You depend on the company that makes it.
Your data
Stays on your computer
Nothing is uploaded. This matters for anything confidential.
Use it for this
Finding the one clause that changed between two versions of a contract, or what someone actually edited in your draft when they said 'minor tweaks'.
Do not use it for this
Comparing very large files on the free tier.
A moment where you would reach for it
Spotting the changed payment terms between the contract you signed and the one you were re-sent.
How hard is it to pick up?
Anyone can use this on day one.
Worth knowing before you use it
The core text comparison runs in your browser — you can verify this by disconnecting from the internet and using it anyway. Do not use the upload-based features for confidential documents.
Other things that do this job
No tool is best at everything. These solve a similar problem, with different trade-offs.
About this entry
Checked on 1 Sept 2026. Prices and free limits change without warning, and often quietly. Treat everything above as a starting point and confirm on the official site before you rely on it.
Nothing here is sponsored. A tool appears because it solves a real problem, not because someone paid for it to be listed.