Text diff checker

Compare an original and a revised text line by line. Unchanged lines start with a space, removed lines with minus, and added lines with plus.

On your device · No account

Privacy details

Text diff checker processes your input in this browser. Inputs and results are excluded from analytics. Recent tools save tool names, visit counts and last-visit times. Saved tools store only their names. Draft saving is optional and stays on this device; delete saved text with the draft controls. Loading text from a URL is optional and contacts that server; its URL and your IP address are visible to the server. An optional “Use in” action keeps a handoff in this tab. The next tool removes it on arrival and ignores it if more than a minute has passed.

Copy link includes the inputs you choose to share in the address. Anyone with that link can reopen them. Files and generated results are excluded. Password and key tools share settings only.

Original textRevised text

Changes between the texts

Reset reloads the tool with its starting values and releases open files and device controls. Saved drafts stay on this device until you delete them.

Links include your inputs and settings. Anyone with the link can see them, so leave out private text. Files and generated results are left out; random draws run again.

Keyboard shortcuts

Updated 2026-09-19

Using Text diff checker

Compare an original and a revised text line by line. Unchanged lines start with a space, removed lines with minus, and added lines with plus.

Next: Online notepad

A worked example

The text diff checker changes "alpha\nbeta" becomes " alpha\n- beta\n+ gamma".

Next: Edit counter

Before you use the result

Comparison is exact and case-sensitive. Line endings are normalized. Each side is limited to 500 lines; the result describes textual changes, not their meaning.

Next: Typing test

Cite this page

Citation style

ToolOctopus. “Text diff checker.” Updated 2026-09-19. https://tooloctopus.com/text-diff-checker.

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Citation formatting uses citeproc-js by Frank Bennett and Citation Style Language styles. Licence and source code.