Text Diff Tool Online
Compare two texts side by side
Como usar Diferença de Texto
- 1
Paste original text
Enter the original text in the left panel.
- 2
Paste modified text
Enter the modified version in the right panel.
- 3
View differences
Added, removed, and changed lines are highlighted automatically.
Perguntas frequentes
Is my data safe?
Can I compare code files?
How are differences displayed?
Does it handle very long documents?
Can I compare files instead of pasting text?
Saiba mais
O que é Text Diff?
Compare two blocks of text side by side and see additions, deletions, and changes highlighted instantly. Useful for code reviews, tracking document revisions, spotting configuration changes, and verifying that edits were applied correctly. Works with any plain text including source code, JSON, YAML, HTML, and Markdown. All comparison happens locally in your browser — paste sensitive content without worry. No sign-up, no limits, no server uploads.
Por que usar Text Diff?
- Line-by-line highlighting — added lines, removed lines, and changed sections are color-coded for instant visual clarity.
- Works with any plain text — source code, configuration files, documents, CSV data, or any text format.
- Completely private — both text inputs stay in your browser. Compare confidential code or private documents safely.
- No file upload needed — paste directly into the text panels for fast comparison.
- Instantly accessible — no software to install, no account to create.
Casos de uso de Text Diff
Code review
Compare two versions of a function or file to review changes without a version control system. Paste the original and modified code side by side.
Document revision tracking
Compare a draft against the published version of a contract, policy document, or article to identify exactly what changed.
Configuration file comparison
Spot differences between production and development config files (JSON, YAML, .env) to debug environment-specific issues.
Data verification
Compare exported data before and after a database migration or transformation to confirm the output matches expectations.
Dicas e boas práticas
- 💡For the most readable diff, compare text at the same logical level — for example, both formatted JSON rather than one formatted and one minified.
- 💡Whitespace-only differences can clutter the diff view. If indentation varies between versions, normalize formatting first using the JSON Formatter or a code editor.
- 💡The diff tool is line-based. If you are comparing prose where line breaks differ, you may get more meaningful results by using paragraph-level chunking.
- 💡Use Ctrl+A to select all text in each panel quickly when replacing content for a new comparison.
Como funciona
The comparison algorithm uses a line-by-line diff based on the Myers diff algorithm, which finds the shortest edit script between two sequences. Additions are marked in green, deletions in red, and unchanged lines are shown without highlighting. The implementation runs entirely in the browser using JavaScript, with no server calls. For very long documents (thousands of lines), the diff may take a moment to compute — performance scales with the number of changed lines rather than total file size.