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// tools/
Free utilities for the things you look up every week. They run in your browser, so there's nothing to install and nothing you type is uploaded. For full apps, see the products.
A side-by-side Markdown editor with GitHub-flavored syntax, code highlighting, math and Mermaid diagrams. Share with a link or export to HTML and PDF.
openPretty-print or minify JSON, find the exact line and column of a syntax error, fix comments and trailing commas in one click, and browse big documents as a collapsible tree.
openGenerate random passwords, memorable passphrases from the EFF word list, or PINs, with a live strength estimate. Uses your browser's cryptographic randomness; nothing is sent anywhere.
openWrite a JavaScript regex and watch matches light up in your text. See every match and capture group, try replacements, and read the pattern explained piece by piece.
openPaste a JWT to see its header and claims, when it was issued and when it expires, and check its signature with a secret or public key. Your token never leaves the browser.
openPaste two versions of a text or code file and get a side-by-side or unified diff with changed words highlighted. Ignore whitespace or case, and download a .patch.
openType a cron expression or build one field by field. See what it means in plain English, the next runs in your time zone or UTC, and ready-to-paste crontab and GitHub Actions lines.
openPaste a messy query and get clean, consistently indented SQL. Pick your dialect, keyword case and indentation, or minify it back onto one line.
openOne-click presets for JWT and session secrets, Auth.js AUTH_SECRET, AES keys, Laravel and Django keys, API keys and UUIDs, in hex, base64 or base62, ready to paste into .env.
openFlowcharts, sequence, class, state, ER and Gantt diagrams from plain text, rendered as you type. Pick a theme, zoom and pan, then export SVG or PNG or share a link.
open Missing a tool?Tell me what you keep searching the web for, and it might end up here.suggest one