Text Diff Checker
Compare two blocks of text side-by-side and instantly see additions, deletions, and changes highlighted.
- Paste the original text into the left pane and the modified version into the right.
- Additions, deletions, and changed lines are highlighted automatically.
- Switch between side-by-side and unified diff views.
- Useful for comparing config files, code snippets, or document revisions.
All processing happens entirely in your browser. Your data never leaves your device.
Key Features
- Side-by-side and unified diff views
- Color-coded additions (green), deletions (red), and modifications
- Line-level and character-level difference highlighting
- Handles any text format — code, config, prose, data
- No file size restrictions beyond browser memory
- 100% client-side — no data transmitted
About Text Diff Checker
A diff (short for difference) tool compares two pieces of text and visually highlights what was added, removed, or changed between them. Diff algorithms are at the heart of version control systems like Git, and understanding diffs is essential for code review, debugging, and configuration management.
The most common diff algorithm (Myers' algorithm) finds the shortest edit script — the minimal set of insertions and deletions needed to transform one text into the other. The result is displayed with added lines in green and deleted lines in red, making changes immediately visible.
ForgeKit's Text Diff Checker provides both side-by-side and unified diff views with color-coded highlighting. It handles any text — code, configuration files, documentation, prose, or data — and runs entirely in your browser with no upload or server processing.
Frequently Asked Questions
Currently, you paste text into the two input panes. To compare files, open them in a text editor and copy-paste the contents.
Yes. Within changed lines, the specific characters that differ are highlighted, making it easy to spot subtle changes like typos or value modifications.
Absolutely. Paste the original and modified code to see a clear visual diff, similar to what you'd see in a Git pull request.