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

Free text compare tool online for code, JSON, and documents

Paste two versions and instantly compare text, code, JSON, YAML, SQL, configs, and draft documents. Contrast runs locally in your browser, so your content stays private.

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

Original
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Changed
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Paste your text above to get started

Or to see Contrast in action.

A private online diff tool for everyday review work

Contrast helps developers, operations teams, HR admins, analysts, and reviewers compare two versions quickly. Use it to spot wording changes, code edits, config drift, or line-by-line document updates without sending sensitive text to a server.

  • +Compare policy drafts, contracts, SOPs, and internal documents before approval.
  • +Review JSON, YAML, SQL, and config changes without opening Git or a desktop app.
  • +Check exported HR, payroll, claims, or finance data before sharing a final version.

Popular comparison pages

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

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Compare SQL online with a free SQL diff checker. Review query updates, schema snippets, and migration scripts side by side without installing extra tools.
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.

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 text compare

  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.

TextCodeJSONYAMLSQLCSVMarkdownConfigs

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

Text Compare FAQ

Is Contrast free to use?

Yes. Contrast is free to use and runs in your browser, so you can compare text and files without creating an account.

Does Contrast upload my text to a server?

No. The comparison runs locally in your browser. Your pasted content and uploaded files stay on your device.

What can I compare with Contrast?

You can compare plain text, code snippets, JSON, YAML, SQL, CSV exports, Markdown, and many common text-based file formats.

Can I switch between side-by-side and unified diff views?

Yes. Contrast supports both split and unified views, plus options like hide unchanged lines, JSON normalization, and whitespace controls.