ToolKitText tools
Diff Checker
Compare original and modified text with line-level difference stats.
Compare text
Lines added
2
Lines removed
1
Similarity
57%
- Line two + Line 2 + Line four
How to use the Diff Checker
The Diff Checker compares two blocks of text or code and highlights exactly what changed — additions in green and deletions in red — much like the diff output you see in Git. Paste an original version and a modified version, and you get a clear, line-level breakdown of every insertion, deletion and edit so nothing slips past unnoticed.
Developers use it to review the differences between two code revisions or configuration files, while writers and editors compare drafts to spot inserted or removed sentences. It is equally useful for checking contracts, translations or any pair of documents where a small, easily missed change can have outsized consequences.
The comparison runs locally in your browser, so neither version is ever uploaded to a server. That keeps proprietary code, legal text and other sensitive documents private, and because there is nothing to install and no account to create, you can drop in two snippets and see the differences in seconds whenever you need to.
Frequently asked questions
What is a diff checker?
A diff checker compares two pieces of text and highlights what changed — additions in green, deletions in red — similar to Git diff output.
Can I compare code with this tool?
Yes. Paste any code, config file or plain text and see the exact differences line by line.