ComparLab
Text

Processed locally in your browser

Compare Text Online

Compare two versions of text and instantly highlight additions, removals, and changes. No account required—and your content never leaves this browser.

Live

Original

Paste or drop a file

Changed

Paste or drop a file

Your differences will appear here

Paste or upload two versions, then compare.

How it works

  1. Paste, type, or open both versions from your device.
  2. Choose the precision and cleanup options that fit your content.
  3. Review additions and removals side-by-side or as a unified diff.

Useful features

  • Smart, line, word, and character-level comparison
  • Side-by-side and unified diff views
  • Whitespace, case, and blank-line controls
  • Local file opening, drag and drop, copy, and .diff download

Common uses

  • Editors checking revisions without tracked changes
  • Developers reviewing logs, configuration, or documentation
  • Operations teams spotting changes in reports and records

Tips for a cleaner comparison

  • Ignore whitespace when indentation is not meaningful.
  • Use word or character precision for short prose edits.
  • Turn off line wrapping when reviewing long log or code lines.

Related comparison tools

List DiffOpen this browser-based tool →JSON CompareOpen this browser-based tool →XML CompareOpen this browser-based tool →Code CompareOpen this browser-based tool →

Frequently asked questions

Is ComparLab free?＋

Yes. Every comparison tool in this version works without registration or payment.

What happens to the text I compare?＋

Comparison content is held in memory and processed locally in your browser. It is not uploaded to a ComparLab server or sent to analytics.

Can I compare files?＋

Yes. Open or drag common text-based files up to 5 MB. The browser reads them locally.

Can I ignore whitespace and letter case?＋

Yes. Both options are available beneath the editors, along with blank-line and wrapping controls.

What is the difference between the views?＋

Side-by-side aligns both versions in two panels. Unified view places unchanged, removed, and added lines in one Git-style stream.

Can I compare source code?＋

Yes. Use Code Compare or the dedicated SQL, Java, and YAML tools for language-specific examples and guidance.

Is there a file size limit?＋

This version applies a 5 MB per-file safety limit and pauses live comparison above 500,000 combined characters to protect browser responsiveness.

More comparison tools are coming

PDF, Word, Excel, and image comparison are planned for a future release. They are not part of this version, and there are no inactive buttons pretending otherwise.