DiffMergy — developer tool, live in production.
A browser tool for comparing, diffing and merging two files line by line, with everything running client-side so nothing sensitive ever leaves the machine.
What was broken
Developers often need a quick diff but will not upload proprietary code to a server, install a desktop app, or create yet another account just to compare two files. The tools that existed all asked for one of those.
Results
- Zero server upload — code never leaves the browser
- Word-level inline diff highlighting
- Merge and export in one view
- No sign-up, no install, instant load
Decisions that made the difference.
Runs entirely in the browser
No upload endpoint and no server round-trip. Files are read locally and the diff is computed in the tab, so source code never leaves the machine.
Line- and word-level clarity
Added, removed and changed lines are colour-coded with inline word-level highlighting, so small edits stand out instead of drowning in noise.
Merge, not just compare
Beyond viewing changes, users pick which side wins per block and export the merged file directly from the same view.
Zero friction by design
No sign-up wall, no file-size trap, no setup. Open the page, paste two files, done — which is why people actually keep using it.
Have something similar
to figure out?
A free technical audit of your system or your product idea — architecture, risks and what we would build first. No obligation, no hard sell.
or call directly: +91-7985933261