Compare two texts online (diff checker)
Compare two texts or files line by line and see what was added, removed or unchanged. Ideal for code, contracts and config files.
How it works
Paste the original text on the left and the changed one on the right. The tool computes line-by-line differences with the longest common subsequence algorithm and marks added lines in green and removed lines in red.
You can ignore case and leading or trailing whitespace on each line, and see a summary with the number of changes.
Frequently asked questions
Can I compare source code files?
Yes. Paste the content of both files. Very large files (tens of thousands of lines) may take a few seconds.
Are my texts stored?
No. The comparison runs in your browser and nothing is stored or sent.
Related tools
JSON validator and formatter online
Validate, beautify, minify and sort JSON online. Shows the exact error line and column. Free, and your data never leaves your browser.
Open toolBase64 encode and decode online
Encode and decode Base64 text with full UTF-8 support (accents, emojis), URL-safe variant, and file or image to Base64 conversion.
Open toolURL encode and decode online
Encode and decode URLs and query parameters (percent-encoding), and break a URL down into protocol, host, path and parameters.
Open toolUUID generator online (v4, v7 and ULID)
Generate UUID v4, time-ordered UUID v7 and ULID, one or thousands at a time. Uppercase, no hyphens and a UUID validator.
Open toolMD5, SHA-1, SHA-256 and SHA-512 hash generator
Compute the MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hash of text or a file, in hex or Base64. Ideal for verifying downloads.
Open toolJWT decoder online
Decode a JSON Web Token and read its header, payload, and issued-at and expiry dates in a readable format. The token never leaves your browser.
Open toolNeed a custom tool for your business?
Tell us about your case and in 30 minutes we'll give you a clear diagnosis: what's going on, what to do first and what it might cost. No strings attached.