Compare two snippets of source code, configuration files, SQL queries, or API payloads with side-by-side visual diffs and inline character difference highlighting.
All formatting, parsing, decoding, and validation executes entirely within your browser using modern Web APIs and JavaScript. Your tokens, JSON payloads, regex inputs, and queries never leave your computer.
Pinpointing subtle discrepancies between code versions, environment configurations (.env, YAML, JSON), or production database schemas can take hours of manual inspection without a dedicated difference comparison tool.
DevRef's Online Diff Checker runs a Myers difference algorithm directly inside your browser. It highlights additions in green, deletions in red, and modifies inline characters with surgical precision. Toggle between split side-by-side view and unified inline view, ignore whitespace differences, and quickly copy merged results. All comparisons execute locally without transmitting your confidential code to any remote server.
Yes. Toggle the 'Ignore Whitespace' setting to filter out indentation, trailing spaces, or line ending differences (CRLF vs LF).
Because processing runs entirely in your browser's V8 engine, it can comfortably compare thousands of lines in milliseconds without server timeout limits.
No. All diff calculations run client-side in browser memory. No code, configuration values, or text snippets are uploaded to any server.