Compare two OpenAPI specs side-by-side to detect breaking changes, new endpoints, removed fields, and modified schemas between versions. Code never leaves your device — formatting and validation run locally in your browser.
Content reviewed October 2026 · About Toolzum
Diff two JSON documents with path-level change listing — spot breaking API changes instantly. Review a 500-line response diff in minutes — local processing, free, no signup.
Generate Markdown API documentation from OpenAPI specs with endpoints and examples. Publish clean reference docs fast — local conversion, free, no signup.
Generate structured changelogs from API version diffs. Categorize changes as Added, Changed, Deprecated, Removed, Fixed, or Security.
Diff two PDFs side by side — spot changed clauses, figures, and pages before signing. Review a 20-page contract revision in minutes — local PDF.js comparison, free, no signup.
Convert between kW, hp, bhp, W, MW, and BTU/hr — engine specs, solar sizing, and HVAC math in one place. Size solar arrays and compare engine outputs correctly — free, local, no signup.
Spec diff — OpenAPI v1 against v2, structural changes highlighted.
Removed endpoints, narrowed types, and new required fields surface first.
Markdown and JSON reports for review threads, CI gates, and pull requests.
No — comparison runs locally in your browser, free with no signup.
OpenAPI Validator
Basic structural check for OpenAPI/Swagger specs — required top-level fields, non-empty paths, and $ref presence. A heuristic screen, not a full spec validation: passing here does not guarantee a valid spec.
API Changelog Generator
Generate structured changelogs from API version diffs. Categorize changes as Added, Changed, Deprecated, Removed, Fixed, or Security.