Free Diff Checker
Compare two texts instantly and highlight additions, removals, and changes. Free, private, and runs in your browser.
Diff Checker Tool
Visual diff result
Paste two texts and click Compare to see additions, removals, and changes.
Comparison runs locally in your browser. Nothing is uploaded.
Frequently Asked Questions
What is a diff checker?
A diff checker compares two versions of text and highlights what was added, removed, or changed. It is useful for editing, proofreading, code review, and comparing drafts.
How does line-by-line comparison work?
Line-by-line comparison treats each line as a unit. The tool checks which lines stayed the same, which were removed, and which new lines were added, making it useful for paragraphs, lists, and code blocks.
What is word-by-word comparison?
Word-by-word comparison breaks text into smaller tokens so you can see edits inside a sentence or paragraph. This helps when only a few words changed but the overall line stayed similar.
Does this tool store my text?
No. The comparison runs entirely in your browser. Your text is not uploaded, stored, or tracked.
Can I compare code with this tool?
Yes. You can compare code snippets, configuration files, and plain text. Line mode is especially helpful for code, while word mode helps with smaller inline changes.
Why do spacing and case affect results?
By default, a diff checker treats uppercase and lowercase letters as different and also notices extra whitespace. The ignore-case and ignore-extra-spaces options let you compare based on meaning instead of formatting differences.