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

Compare two files online with a private in-browser diff

Upload two text-based files or paste their contents to compare revisions side by side. Great for policies, reports, config files, exports, and document drafts.

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.

A file comparison workflow without the desktop install

Contrast gives you a quick way to compare two files online when you do not want to install extra software. Upload supported text-based files, review every change, and export the result for a teammate or approver.

  • +Compare two exported reports before you send them to a client or vendor.
  • +Check draft policies, offer letters, and internal docs for unexpected edits.
  • +Review config files, SQL snippets, and developer handoff documents from different environments.

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 Text Online
Compare text online with a fast side-by-side diff checker. Highlight added, removed, and changed words instantly without sending your text to a server.
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 two files 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.

TXTMDJSONCSVXMLHTMLCSSJSTSYAMLSQL

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

Compare Two Files Online FAQ

Which file types can I compare online?

Contrast supports many text-based formats including TXT, Markdown, JSON, CSV, XML, HTML, CSS, JavaScript, TypeScript, YAML, and SQL.

Can I compare files without creating an account?

Yes. You can upload and compare supported files right away without signing in.

Does Contrast store uploaded files?

No. The file processing happens locally in your browser, so Contrast does not need to store your uploaded content.

Can I export the compared result?

Yes. Contrast can generate a report that you can copy or download.