URL Encode / Decode (Percent-Encoding)

URL Encode/Decode (percent-encoding) converts unsafe characters into a URL-safe format and back again. Use it for query strings, redirect URLs, UTM parameters, and debugging API requests (RFC 3986). Runs 100% locally in your browser — no uploads — and works offline after installing ToolMill as a PWA.

Encoding

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Examples

Encode text for use in a URL

Input

https://example.com/search?q=hello world&src=toolmill

Output

https%3A%2F%2Fexample.com%2Fsearch%3Fq%3Dhello%20world%26src%3Dtoolmill

Decode percent-encoded URL text

Input

name%3DAlice%20%26%20Bob%26note%3D100%25%20free

Output

name=Alice & Bob&note=100% free

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Base64 Encode / Decode Tool

Encode text into Base64 or decode Base64 back into readable content directly in your browser. It is useful for inspecting tokens, debugging authorization headers, checking config values, decoding API payloads, and converting plain text without using a remote service. ToolMill runs fully client-side for privacy and continues to work offline after installation.

Encoding

Hex Encode / Decode — Text ↔ Hex

Hex Encode / Decode converts text into hexadecimal (base-16) bytes and decodes hex back into readable text. Use it for debugging binary payloads, inspecting UTF-8 bytes, reversing escaped strings, and working with hashes or low-level protocols. Accepts common hex formats (with or without spaces, newlines, or 0x prefixes). Runs 100% locally in your browser — no uploads — and works offline after installing ToolMill as a PWA.

Encoding

HTML Entity Encode / Decode — Escape & Unescape HTML

HTML Entity Encode / Decode converts special characters like <, >, &, and quotes into safe HTML entities (and decodes them back). Use it when working with HTML attributes, templates, CMS editors, Markdown docs, or when debugging copy/paste issues. Handles common named entities (e.g. <, >, &, ") and numeric entities. Runs 100% locally in your browser — no uploads — and works offline after installing ToolMill as a PWA.

Encoding

ROT13 Encode / Decode — Text ↔ ROT13 Cipher

ROT13 is a simple letter substitution cipher that shifts A↔N, B↔O, etc. It is often used for spoilers, light obfuscation, and forum/email text. This tool encodes plain text to ROT13 and decodes ROT13 back to text (the operation is symmetric). Runs 100% locally in your browser — no uploads — and works offline after installing ToolMill as a PWA.

Encoding