Developer Tools
Text Diff Checker
Paste two versions of any text (code, documents, configs) and get a clear side-by-side diff with every addition in green, every deletion in red, and unchanged lines in grey. Works on any plain text.
Diff computed in your browser; text never leaves your device
Features
- Line-by-line diff with added/removed/unchanged colour coding
- Side-by-side and unified diff view modes
- Shows count of added lines, removed lines, and total changes
- Ignores trailing whitespace (optional)
- Case-insensitive comparison mode
- Copy or download diff report as .txt
How to use it
- Paste your original text in the left panel.
- Paste the modified text in the right panel.
- The diff highlights appear immediately.
- Switch between side-by-side and unified view using the toggle.
- Download the diff report for sharing or documentation.
Use cases
- Comparing two versions of a config file before deploying
- Reviewing copy changes in a document draft
- Identifying what changed in a pasted API response
- Comparing two SQL queries or code snippets
Limitations
- Changed lines are marked with minus and plus prefixes.
- Very large input can be slower on older devices.
- This utility is designed for common snippets and local inspection, not as a full security or language-specific validator.
Related tools
Regex Tester
Test and debug regular expressions online. Paste your pattern and test string to see all matches highlighted, with capture groups listed and flags explained.
Use toolLog Prettifier
Prettify JSON log output from Node.js, Python, or any structured logging framework. Colorised, formatted, and readable, browser-only.
Use toolJSON Formatter
Format and beautify JSON online. Paste minified or messy JSON and get clean, 2-space indented output with syntax validation, instant, in-browser, no upload.
Use toolJSON Validator
Validate JSON syntax online with exact error messages. Get line number, column, and a human-readable explanation for every JSON error, processed in your browser.
Use toolJSON Minifier
Minify JSON by removing all whitespace and line breaks. Paste pretty JSON, get compact JSON for APIs, payloads, and config files. Browser-only, free.
Use toolJWT Decoder
Decode and inspect JSON Web Tokens in your browser. See the header, payload, and signature in readable JSON. No server, no logging, completely private.
Use toolFrequently asked
Does it do word-level diff?
The default is line-level. Changed lines are highlighted; you can see word-level changes by looking at the side-by-side view of each modified line.
Can I compare files?
Yes. Each panel accepts drag-and-drop or file upload for .txt, .md, .json, .yaml, .csv, and similar text files.