Diff Checker

About the Diff Checker

Spotting the one line that changed between two versions of a file is tedious when you're scanning by eye. This page lines an original and a changed version up side by side, pretty-prints JSON or XML first so the structure lines up cleanly, and highlights exactly which lines — and which words within a line — are different, so a small edit doesn't get lost in a wall of unchanged text.

Things you can do here

• •Compare JSON, XML, or plain text — pick a format or let Auto detect it, and both sides get pretty-printed before comparing.
• •Split view with line numbers — see the original on the left and the changed version on the right, each numbered independently.
• •Word-level highlighting — on a modified line, only the words that actually changed are called out.
• •Ignore whitespace or case — filter out noise that isn't a meaningful difference.
• •Only show differences — hide the lines that match so you can focus purely on what changed.
• •Merge line by line — apply individual additions or changes to the original, remove deleted lines, copy either side, or export the full diff.