Diff Checker
Paste two versions of any text — code, documents, config files — and instantly see exactly what changed. Added lines are highlighted in green, removed lines in red. Ideal for code review, proofreading, and spotting config changes.
Paste text in both panels to see differences
Features
- Side-by-side and unified diff views
- Line-by-line comparison with color coding
- Added lines highlighted in green, removed lines in red
- Unchanged lines shown as context
- Works with code, documents, config files, and plain text
- Shows total added and removed line counts
Frequently Asked Questions
What is a diff checker?
A diff checker compares two pieces of text and highlights the differences between them. 'Diff' stands for difference — it is the same algorithm used by version control systems like Git to show what changed between commits.
How do I compare two versions of code?
Paste the original code in the left (Original) panel and the modified version in the right (Modified) panel. Changes are highlighted instantly — green lines were added in the new version, red lines were removed or changed.
What is a unified diff vs split diff?
A split diff shows original and modified text side-by-side in two columns, making it easy to compare corresponding sections. A unified diff shows everything in a single column, with added lines marked + and removed lines marked −. Split view is better for small changes; unified view is better for large files.
Can I use this to compare documents?
Yes. Our diff checker works with any plain text including source code, configuration files, legal documents, emails, and articles. Copy and paste the text from any document and the differences will be highlighted immediately.