Contrast by Unifysy
100% Free Runs in Browser No Data Sent

Compare text online without sending your content anywhere

Use Contrast to compare two versions of text, notes, messages, policies, prompts, and drafts online. Review changes in seconds with a clean split or unified view.

Text, code, JSON, configs — paste it in and see every difference highlighted. Your data never leaves your device.

Original
Empty
Changed
Empty

Paste your text above to get started

Or to see Contrast in action.

Built for fast text reviews

When you need to compare text online, speed and clarity matter. Contrast makes it easy to review wording changes, paragraph edits, and line-by-line updates across notes, emails, drafts, and working documents.

  • +Review content edits before publishing a new article, email, or landing page.
  • +Compare prompt drafts, knowledge base answers, and chatbot responses.
  • +Check policy wording, offer letters, and HR communications before approval.

Popular comparison pages

Jump to a focused page for the format or workflow you need to review most often.

Text Compare
Compare text, code, JSON, and document drafts online with a free browser-based diff checker. See added, removed, and changed content without uploading your data.
Compare Two Files Online
Compare two files online with a private browser-based diff tool. Upload text-based files, review line changes, and export the result in seconds.
Document Comparison Tool
Use an online document comparison tool to review draft changes, policy updates, contracts, and internal documents side by side in your browser.
JSON Diff Checker
Compare JSON online with a free JSON diff checker. Normalize formatting, spot changed keys and values, and review API payload differences in your browser.

Private by default

The comparison runs in your browser, which keeps drafts, configs, and internal data on your device.

Made for revision-heavy work

Switch between split and unified diff views, hide unchanged lines, and focus on the edits that matter.

Useful for both business and technical teams

Compare text, files, code, exports, and structured data in one place without extra tooling.

How to use this compare text online

  1. 1Paste the original content or upload the first file.
  2. 2Paste the revised content or upload the updated file.
  3. 3Choose options like JSON normalization, whitespace rules, or character-level diff when needed.
  4. 4Run the comparison and review the highlighted additions, removals, and changed lines.

Formats teams compare with Contrast

Contrast works well for common text-heavy workflows and structured data review. These are the formats most relevant to this page.

Plain textMarkdownEmailsPoliciesDraftsPrompts

You can also upload text-based files such as TXT, Markdown, JSON, CSV, XML, HTML, CSS, JavaScript, TypeScript, YAML, and SQL.

Compare Text Online FAQ

What is the easiest way to compare text online?

Paste the original text on one side, paste the updated text on the other side, and run the comparison. Contrast highlights additions, removals, and changed words instantly.

Can I compare long text blocks?

Yes. Contrast is designed for long text as well as short snippets, with options to hide unchanged lines and navigate between edits.

Will Contrast keep my text private?

Yes. The tool runs in-browser, so your text is not uploaded for comparison.

Can I copy or export the diff report?

Yes. You can copy the compared text or export the diff output as a report.