Encoding Tools

Encoding changes how data is written so it can travel safely through a system that would otherwise break it: a URL that cannot contain spaces, an HTML page that would treat < as a tag, an email header that only accepts ASCII, or a JSON field that cannot hold raw binary.

12 tools

HTML Entity Encode

Turn <, >, & and quotes into HTML entities so code displays as text instead of running.

HTML Entity Decode

Convert entities like & and " back into readable characters.

URL Encoder

Percent-encode spaces, symbols and accented letters so a URL or query value travels safely.

URL Decoder

Turn %20-style percent-encoding back into a readable URL or parameter.

Text to Binary

Show the 8-bit binary code behind every character of your text.

Binary to Text

Decode groups of 0s and 1s back into readable text.

Text to Base64

Encode text as Base64 for use in JSON, headers, data URIs and config files.

Base64 To Text

Decode a Base64 string to reveal the text inside it.

ROT13 Encoder & Decoder

Encode or decode ROT13: shift every letter 13 places to hide or reveal spoilers and puzzle answers.

Punycode Converter

Convert a domain like münchen.de to its xn-- Punycode form, or decode xn-- back to Unicode.

Encode Quoted Printable

Encode accented letters and symbols the way email (MIME) expects them.

Decode Quoted Printable

Clean up =C3=A9-style email source back into the original readable text.

More about Encoding Tools

Each tool here comes as a pair, one to encode and one to decode, so you can go in either direction. A quick rule of thumb: use URL encoding for query strings, HTML entities for showing code on a page, Base64 for carrying binary data inside text, and Punycode for international domain names. Remember that encoding is not encryption; anyone can reverse it.

Guides for these tools

What Is Base64 Encoding, and When Should You Actually Use It? Base64 encoding turns binary data into plain text so it survives systems built for text. Here is what it is for, and what it is not for.