text diff tool

How to use the text diff tool

  1. Paste two versions of text into the left and right panels.
  2. The diff view highlights additions (green), removals (red), and unchanged lines (gray).
  3. Toggle between line-level and word-level diff — word-level shows changes inside a single line.
  4. Copy a unified diff (git-style) or share the comparison via URL.

When to use it

Quick content comparisons: two drafts of an email, two versions of a legal clause, before/after paste from a non-git editor. For code changes, git diff or a pull request review is better because it understands semantic context. Alternative: Diffchecker is the well-known web equivalent; this tool is ad-free and keeps data local.

Frequently asked questions

Does it detect reordered lines as a change?
Yes — the diff algorithm treats reordering as (line removed) + (line added). For paragraph-level prose diffing, pick word-level mode to ignore wrapping changes.
Can I compare two files?
Yes — drag-and-drop two text files or paste their contents.
Is the comparison stored server-side?
Only if you generate a share URL, and only briefly. Clipboard-based copies stay in your browser.
Does it support large files?
Up to ~1 MB per side stays fast. Beyond that, a CLI tool (diff, delta) is better — browser memory becomes the limit.

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Last updated: 2026-04-22