Online Encoding & Decoding Tools
Free, instant encoding and decoding tools for developers. Convert data to and from Base64, URL-encode strings, decode JWT tokens, generate UUIDs, and more — all 100% client-side.
Every tool runs entirely in your browser. Your data never leaves your device — no server uploads, no login required.
Base64 Encoder
Encode text or binary data to Base64 format instantly.
Base64 Decoder
Decode Base64 encoded strings back to readable text instantly.
URL Encoder
Encode URLs and query strings for safe use in HTTP requests.
URL Decoder
Decode percent-encoded URL strings back to human-readable format.
HTML Encoder
Encode HTML special characters to safe HTML entities.
HTML Decoder
Decode HTML entities back to their original characters.
JWT Decoder
Decode and inspect JWT tokens — header, payload, and signature.
Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text.
UUID Generator
Generate random UUID v4 identifiers for use in your projects.
What are encoding tools?
Encoding tools convert data between different representations — making it safe for transport in URLs, email headers, or HTML documents. Unlike encryption, encoding is reversible with no key required.
Common encoding formats
- Base64 — encodes binary data (images, files, audio) as ASCII text for use in JSON, CSS, or email
- URL encoding — converts special characters to
%XXformat for safe transmission in URLs - HTML encoding — escapes characters like
<and&for safe display in HTML - JWT — Base64url-encoded JSON tokens used for authentication
- UUID — universally unique identifiers used as database keys and API tokens