Diff Checker
Compare text with line-level and character-level highlighting
$ how-to-use
Paste the original text on the left and the modified text on the right. Differences are highlighted instantly — green for additions, red for deletions. Toggle between inline and side-by-side views.
Why Use a Diff Checker?
Comparing two versions of text manually is slow and error-prone — especially with large documents, code files, or configuration changes. A diff checker highlights exactly what changed, what was added, and what was removed, line by line.
Developers use diffs constantly: reviewing pull requests, debugging config changes, comparing API responses, and verifying deployment differences. Writers use them to track document revisions. System admins compare config files across environments.
View Modes
Side by Side
Shows original and modified text in two columns. Best for comparing files with many changes — easy to scan left-right.
Inline
Shows changes in a single column with additions and deletions interleaved. Similar to git diff output. Best for small, focused changes.
Character-Level Diff
Highlights individual character changes within lines, not just whole-line differences. Crucial for spotting typos and small edits.
Ignore Whitespace
Skip formatting-only changes like indentation and trailing spaces. Focus on actual content differences.
FAQ
How large can the text inputs be?
The diff runs in your browser, so it depends on your device. Typical modern browsers handle texts up to several megabytes comfortably. For very large files, performance may vary.
What diff algorithm is used?
The tool uses a standard line-by-line diff algorithm similar to what Git uses. It finds the longest common subsequence and highlights additions and deletions relative to that.
Is my data private?
Yes. All comparison happens in your browser. No text is sent to any server. Safe for comparing sensitive code, configs, and documents.