Text Diff Viewer

Free online text diff viewer. Highlights additions, deletions and changes side-by-side or line-by-line. Compare code, configs or any text. Runs fully in your browser.

Compare two blocks of text side-by-side or line-by-line with color highlights. Paste your original and modified text, and Bee Tools will match them line-by-line, classify each difference, and render the result with clear color cues. Powered by jsdiff, it stays smooth even with thousands of lines.

A complete guide to text diffing

Why diff?

Diffing is the foundation of code review, version control and document revisions. A clear visual diff lets collaborators spot what changed within seconds.

Side-by-side vs line-by-line

  • Side-by-side — both versions appear simultaneously; great for medium-length code or prose.
  • Line-by-line — a single chronological stream; ideal for issues, PR descriptions, emails.

Common scenarios

  1. Code review — see exactly what a PR changes.
  2. Legal edits — counsel pinpoint amended clauses.
  3. Config diffs — nginx, YAML, JSON changes become obvious.
  4. Translation review — translators compare source vs target.
  5. Learning — study how famous OSS projects refactor their code.

Pro tips

  1. Sort first — sorted files produce tighter diffs.
  2. Ignore whitespace with git diff -w to suppress noise.
  3. Stick to one style for tabs and spaces — mixing them creates phantom diffs.

Bee Tools' diff tool runs entirely in your browser — even a 10,000-line compare completes in milliseconds.

Open-source notice: Diff computation by jsdiff (BSD-3-Clause); HTML rendering by diff2html (MIT). Copyright (c) 2009-2015 Kevin Decker; Copyright (c) 2014-present Rodrigo Fernandes.

FAQs

Which diff algorithm do you use?
We use the proven Myers diff algorithm (via jsdiff). It first matches lines, then highlights intra-line character differences. The same family powers Git and Subversion.
Which encodings are supported?
UTF-8 is fully supported, including CJK characters and emoji. Convert other encodings to UTF-8 first if necessary.
How large a text can I compare?
Up to ~50,000 lines is comfortable. Beyond ~200,000 characters, rendering becomes noticeably slow.
Does it show character-level differences?
Yes. After matching whole lines, character-level changes (added in green, removed in red) are highlighted inside each modified line.
How do I export the result?
Print the page as a PDF (Ctrl/Cmd-P) or select-all and copy. For a .diff file, save both versions and run `git diff` locally.