Zerethon Tools

3 offline tools (JSON, Base64, hash) + launcher for 109 more at tools.zerethon.com. Right-click prefill, omnibox zt.

Zerethon Tools is a privacy-first toolkit + launcher for 112 free dev, creator, and web3 utilities. Three of the most-used tools run FULLY OFFLINE inside the extension — no network access, no data leaves your device. THREE TOOLS RUN OFFLINE (no internet required) • JSON Formatter — pretty / minify, indent control, sort keys, line+column error reporting. • Base64 Encoder & Decoder — UTF-8 safe, URL-safe variant, swap input↔output in one click. • Hash Generator — SHA-1 / SHA-256 / SHA-384 / SHA-512 via the browser's Web Crypto API. Hex (lower/upper), Base64, or Base64 URL-safe output. Open these from the launcher or right-click selected text on any page — the text is prefilled, ready to format/encode/hash. No network call, no log on our server. Airplane-mode safe. 109 MORE TOOLS — ONE CLICK AWAY Open as new tabs on tools.zerethon.com. The launcher searches all 112 by name, slug, or keyword. A few examples: SQL Formatter · UUID Generator · URL Parser · Color Converter · Markdown to HTML · CSV to JSON · YAML to JSON · Unix Timestamp Converter · UTM Builder · Regex Data Generator · Password Generator · Lorem Ipsum · Text Case Converter · Image Compressor · ETH Unit Converter · Wallet Address Validator · MD5 Hash Generator · … BROWSER-NATIVE SHORTCUTS • Right-click selected text → "Zerethon: Format as JSON / Decode Base64 / Encode Base64 / Hash (SHA-256) / Convert case / Parse URL". For the three offline tools the text is prefilled in the extension's own page. For the rest, the matching tool opens on tools.zerethon.com. • Type "zt" in the address bar → autocomplete any of 112 tools. • Pin the launcher to Chrome's side panel — keep it visible while browsing. • Ctrl+Shift+Z (Cmd+Shift+Z on Mac) opens the launcher. Customise the shortcut in chrome://extensions/shortcuts. PRIVACY (READ THIS — IT IS THE WHOLE POINT) • Zero analytics, zero telemetry, zero third-party SDKs. • Three permissions only — storage, contextMenus, sidePanel — plus a single host: tools.zerethon.com. No <all_urls>, no content scripts. • Favorites and recents are stored on your device only. • Selected text is never logged on our server. Either it stays inside the extension (offline tools) or it travels in a URL query parameter that the destination tool decodes client-side. • Full source MIT-licensed on GitHub. The submitted package is built reproducibly from source with `npm run build` — you can audit every line and rebuild the same zip locally. NO ADS. NO PAYWALL. NO SUBSCRIPTION. NO SIGNUP. Source: https://github.com/zerethonapp/extensions Privacy policy: https://tools.zerethon.com/extension/privacy Questions, requests, bug reports: support@zerethon.com