Compare two blocks of text and see exactly what changed, line by line. Free online diff checker — additions in green, removals in red. No login needed.
Line by LineGreen AdditionsRed RemovalsAddition CountFree
Text A — Original
Text B — Modified
Diff Output
Quick reference
What it is
Compares two pieces of text line by line and highlights exactly what changed — green for added lines, red for removed lines.
How to use it
Paste your original text in the left box
Paste the modified text in the right box
The diff output updates automatically as you type
Green lines with + are additions, red with - are removals
When you need this
Comparing two versions of a config file
Finding what changed between two pieces of code
Checking edits made to a document
Comparing two API responses side by side
Good to know
Comparison is line-by-line — one character change counts as the whole line changed
Trailing spaces matter — a line with a trailing space is different from one without
Works for any text — code, JSON, prose, config files
Identical texts show all lines in muted color with no additions or removals
What else we build
Tamil Brothers is an indie studio building games, Discord bots, and digital tools. All free.