sde.tools – Developer Tools

70 developer tools that run entirely in your browser: encoders, converters, formatters, hashing, network calculators and more.

sde.tools puts 70 developer tools one click away in your browser. Every tool runs locally on your device: nothing you type, paste or upload is sent anywhere. The extension makes no network requests and asks for no access to the sites you visit. HOW TO USE IT • Click the toolbar icon (or press Alt+Shift+D) to search and use any tool in the popup. • Open the full dashboard in a tab with Alt+Shift+T. • Keep a tool open beside the page in the side panel. • Select text on any page, right-click, and send it straight to a tool. • Type "sde" and a space in the address bar to jump to a tool by name. • Star your favorites; recently used tools stay at the top. • Light, dark and system themes. TOOLS INCLUDED Encoding and conversion Base64 text and file converter, JSON ⇄ YAML ⇄ TOML ⇄ XML, JSON to CSV, Markdown to HTML, case converter, color converter, date-time converter, integer base converter, text to binary, text to Unicode, NATO alphabet, list converter. Web JWT decoder, HTML entity encoder/decoder, JSON diff, basic auth header generator, meta tag generator, TOTP code generator and validator, MIME types, HTTP status codes, user-agent parser, keycode info, slugify, Safelink decoder, HTML WYSIWYG editor, device information. Crypto and security Hash generator (MD5, SHA-1, SHA-256, SHA-512 and more), HMAC generator, bcrypt hash and check, text encryption and decryption, RSA key pair generator, BIP39 passphrase generator, ULID generator, password strength analyser, PDF signature checker. Development JSON formatter and viewer, JSON minify, regex tester, regex cheat sheet, cron expression generator, chmod calculator, docker run to docker compose converter, Git cheat sheet, email normalizer. Network IPv4 subnet calculator, IPv6 subnet calculator, IPv4 address converter, IPv4 range expander, IPv6 ULA generator, MAC address generator. Text and data Text diff, lorem ipsum generator, emoji picker, string obfuscator, numeronym generator, ASCII text drawer, IBAN validator, phone number parser and formatter. Images and measurement QR code generator, camera recorder, chronometer, benchmark builder. PRIVACY • No accounts, no analytics, no tracking. • No host permissions: the extension cannot read or change the pages you visit. • Settings, favorites and tool preferences are stored only in your browser. • Text you send from the right-click menu is passed to the tool inside the extension and never leaves your device. More tools and written guides for each one are available at https://sde.tools