Diff viewer

Paste two versions of any text and see exactly what changed — added lines in green, removed lines in red. Switch between side-by-side and unified views, or just paste a unified diff to colorize it. Everything runs in your browser.

Mode

Original

Changed

View

Ignore leading/trailing whitespace Ignore case

Everything runs in your browser. No upload, no sign-up.

How it works

STEP 1

Paste both versions

Drop your original text in the left box and the changed text in the right box. Code, prose, JSON, logs — anything line-based works.

STEP 2

Read the diff

A longest-common-subsequence diff highlights every added and removed line. Switch between side-by-side and unified, and check the +added / −removed counts.

STEP 3

Copy the result

Copy a ready-to-share unified diff with one click. Already have a unified diff? Switch to Colorize mode and just paste it in — nothing is uploaded.