How do I compare two texts for differences?

Paste both versions into the free Text Diff Checker and get a highlighted line-by-line comparison.

How do I use the diff checker?

Paste the original text on the left and the new text on the right, then click compare — differences are highlighted line by line.

Can I ignore whitespace differences?

Yes. Turn on "ignore whitespace" to treat runs of spaces, tabs and line-ending differences as equal.

How large a file can I compare?

Up to 5,000 lines per side, which covers typical config files, articles and code files.

DEVELOPER TOOLS · FREE ONLINE TOOL

Text Diff Checker

Compare two texts and see every change line by lineTwo versions of the same text, and the question is always the same: what changed? Paste the original and the revised version, and this checker highlights every added, removed, and modified line, so the changes announce themselves.

✓ Free to use✓ No sign-up✓ Ready in your browser

// TEXT DIFF CHECKER · GET STARTED

Use Text Diff Checker

Compare two texts and see every change line by line

Original text

Changed text

Ignore whitespaceIgnore case

// TEXT DIFF CHECKER · HOW IT WORKS

How to use the Text Diff Checker

Add both versions

Paste the original text on the left and the changed version on the right.

Set compare options

Set the ignore options if whitespace or case should not count as changes.

Review the differences

Read the highlighted result: green for additions, red for removals.

// TEXT DIFF CHECKER · ABOUT THIS TOOL

About the Text Diff Checker

Two versions of a contract, a config file or a web page can look identical while hiding one changed line that matters. The Text Diff Checker lines both versions up and marks exactly what was added, removed or unchanged, with counts so you know the scale of the change immediately. Practical touches are built in: ignore-whitespace for re-indented files and ignore-case for lists and data. Everything is computed in your browser, so sensitive documents never travel.

Where it helps most

Tedious jobs made quick.

Config reviews

Comparing a config file before and after an edit confirms exactly what changed before the new version goes live.

Document review

Reviewing a revised document shows whether the edits match what was agreed, without re-reading untouched paragraphs.

Generated code

Checking generated code after tweaking a template reveals what the generator actually altered behind the scenes.

Edit tracking

Writers see what an editor changed; developers sanity-check merges that happen outside version control.

How it shows changes

Line-level highlighting.

Visual separation

Unchanged lines fade into the background while additions and removals stand out in contrasting colors.

Inline changes

Small changes within a line show up too, so an altered value in a long line does not slip past.

No setup

Unlike a version control diff, there is no repository, no commits, no setup: two pastes and the answer is on screen.

Text Diff Checker: private by design

The comparison runs in your browser, so contracts, configs and unreleased content stay on your device. No signup needed.

// TEXT DIFF CHECKER · COMMON QUESTIONS

Text Diff Checker FAQs

How are the differences displayed?

Unchanged lines appear normally while added lines and removed lines are highlighted in contrasting colors, so changes stand out immediately. Modified lines show as a removal paired with its replacement, and small changes within a line are marked so single altered values do not slip past.

Can I compare code or config files with this?

Does it show word-level or line-level differences?

Is my text uploaded anywhere when I compare?

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