// about developertools

Our Tools

developertools.app currently offers 6 free developer utilities:

• Base64 Encoder / Decoder — encode text and binary data to Base64, decode back to plain text. Supports standard and URL-safe Base64 (RFC 4648) with Unicode handling.
• Unix Timestamp Converter — convert epoch timestamps (seconds or milliseconds) to human-readable local time, UTC, ISO 8601, and relative time. Convert dates back to Unix.
• JSON Formatter & Validator — beautify, minify, and validate JSON with precise syntax error messages showing line and column numbers.
• Password Generator — generate cryptographically secure random passwords using the Web Crypto API. Shows entropy in bits.
• URL Encoder / Decoder — percent-encode and decode URLs per RFC 3986. Supports encodeURI and encodeURIComponent modes.
• HTML Entity Encoder / Decoder — encode special characters to named or numeric HTML entities, decode entities back to characters. Includes a reference table.

All tools are built with plain HTML, CSS, and vanilla JavaScript — no frameworks, no dependencies, no tracking. Pages are lightweight, fast, and accessible on any device.

Technology

This site is 100% static HTML hosted on Apache / cPanel-compatible servers. There is no backend, no database, and no server-side code. Every operation — encoding, decoding, formatting, generating — happens in your browser using browser-native APIs:

• btoa() / atob() for Base64 encoding
• JSON.parse() / JSON.stringify() for JSON formatting
• window.crypto.getRandomValues() for cryptographically secure password generation
• encodeURIComponent() / decodeURIComponent() for URL encoding
• Date API for Unix timestamp conversion

Contact

Questions, feedback, or tool suggestions? Reach us at hello@developertools.app. We read every message.