Compares two input texts side-by-side, highlighting inserted, deleted, and changed lines with distinct background colors. Everything runs locally in your browser — nothing is uploaded.
Compare two OpenAPI specs side-by-side to detect breaking changes, new endpoints, removed fields, and modified schemas between versions.
Compare two JSON objects side-by-side with color-coded key-level differences. Everything runs locally in your browser — nothing is uploaded.
Generate TOTP URIs for two-factor authentication setup with authenticator apps. Everything runs locally in your browser — nothing is uploaded.
Performs pixel-level and text-level comparison of two PDF files, highlighting every difference with color-coded overlay annotations. Everything runs locally in your browser — nothing is uploaded.
Sort lines alphabetically (A→Z, Z→A), reverse order, shuffle randomly, or remove duplicate lines.
Diff Checker lets you compares two input texts side-by-side, highlighting inserted, deleted, and changed lines with distinct background colors. Everything runs locally in your browser — nothing is uploaded.. It works on any device with a modern web browser.
Compares two input texts side-by-side, highlighting inserted, deleted, and changed lines with distinct background colors. Everything runs locally in your browser — nothing is uploaded. It runs entirely in your browser — no software installation or data uploads required.
Enter one or more URLs to analyze.
Yes. After the initial page load, Diff Checker runs entirely on your device with no internet connection needed. All processing is done locally.
Insertions (new lines added), deletions (lines removed), and modifications (changed lines) are each highlighted with distinct background colors so you can spot every difference at a glance.
There's no hard limit. Very large texts (100KB+) may take a moment to compare, but the diff-match-patch algorithm handles substantial inputs efficiently.
Yes. Paste any text — code, config files, documentation, or plain text. The tool compares line-by-line and highlights exactly what changed between the two versions.
The highlighted comparison is displayed visually. You can select and copy the text from either panel, or take a screenshot of the side-by-side view.
JSON Diff Checker
Compare two JSON objects side-by-side with color-coded key-level differences. Everything runs locally in your browser — nothing is uploaded.
API Diff Checker
Compare two OpenAPI specs side-by-side to detect breaking changes, new endpoints, removed fields, and modified schemas between versions.