Runs locally · Zero uploads

Text Diff Tool

Paste two texts, see color-coded additions and deletions instantly.

How it works

Text diffing compares two strings and identifies the minimal set of additions, deletions, and unchanged regions that transform one into the other. This is the same algorithm that powers git diff, code review tools, and document version comparison — but running entirely in your browser.

The output is a unified diff view where added lines are highlighted in green with a + prefix and deleted lines are highlighted in red with a - prefix. Unchanged context lines are shown in the default color for reference. This color-coding makes it easy to spot exactly what changed between two versions of a document, configuration file, or code snippet.

Common use cases include comparing API responses before and after a change, reviewing edits to a contract or legal document, verifying that a minification or formatting tool did not alter content, and debugging configuration drift between environments. The diff runs entirely client-side — both texts stay in your browser and are never transmitted anywhere.

For programmatic diffing or comparing files, the same algorithm is available through the Bytario API with support for word-level diffs, character-level diffs, and structured diff output in JSON format.

Verify it yourself. Open DevTools → Network → run a conversion. The only requests you'll see are the page assets — your file never leaves this tab.

FAQ

What diff algorithm does this use?

The tool uses the Myers diff algorithm, the same algorithm used by Git. It finds the minimal edit script (smallest number of additions and deletions) to transform the original text into the modified text.

Can I compare files instead of pasted text?

Currently this tool compares pasted text. For file-based diffing, read the files locally and paste their contents, or use the Bytario API which accepts file uploads.

Does this handle line-level or character-level diffs?

This tool shows line-level diffs (each line is either added, removed, or unchanged). Character-level highlighting within changed lines is on the roadmap.

Can I diff JSON or XML?

Yes, but the diff is text-based. For structured diffs that understand JSON semantics (added keys, changed values), use a dedicated JSON diff tool. For plain text comparison of JSON or XML, this tool works perfectly.