Can I compare JSON or source code files?

Yes. Format JSON payloads first using our JSON Formatter, then paste both versions here for crystal-clear line diffs.

What does Ignore Whitespace do?

It trims trailing spaces and normalizes indentation differences so you focus purely on meaningful text changes.

Is my confidential contract text uploaded anywhere?

Never—all diff computation executes inside your browser tab.

How large can the compared texts be?

Thousands of lines compare in milliseconds on modern devices.

Text Tools100% Client-Side4.9 (690 ratings)

Text Diff Checker

Built for developers, legal reviewers, and editors spotting exact changes between original and revised drafts.

Ignore extra whitespace

Original Text

Revised Text

Comparison Result

+3 added-3 removed

ToolCix is a fast free online tools platform.
Every tool runs directly in your browser.
Zero signups required.ToolCix is a fast, private free online tools hub.
Every core tool runs locally inside your browser.
Zero signups or watermarks required.

How to Use Text Diff Checker

1Paste the original baseline text in the left panel and the revised text in the right panel.
2Choose Line-by-Line or Word-by-Word comparison mode (plus optional ignore-whitespace).
3Inspect green additions, red removals, and exact added/deleted line counters.
4Swap panels or clear inputs to run another comparison.

Key Features

Powered by industry-standard Myers diff algorithm (`diff` package)
Line-level and inline word-level diff modes
Ignore-whitespace and case-insensitive toggle options
100% private in-browser comparison

Spotting Subtle Edits in Code, Contracts, and Copy

Eyeballing two nearly identical paragraphs or `.env` files almost guarantees missing a swapped digit or deleted clause. Using the Myers diff algorithm, ToolCix highlights every inserted, deleted, and unchanged span unmistakably.

Switch effortlessly between line diffs for structured configuration files and inline word diffs for prose revisions.

Private Side-by-Side Auditing

Because legal agreements, release notes, and server configs often contain proprietary details, keeping comparison strictly client-side ensures your revisions never leave your workstation.