Encode and decode URLs, query strings, and special characters — instantly in your browser. No data leaves your device.
Enter one URL per line:
URL encoding, also known as percent-encoding, replaces unsafe ASCII characters with a % followed by two hexadecimal digits. For example, a space becomes %20 and an ampersand becomes %26. This ensures URLs are transmitted correctly across the internet.
encodeURIComponent() encodes all special characters — ideal for query parameter values. encodeURI() preserves structural characters like :, /, ?, and # — suitable for encoding complete URIs.
Base64 converts binary data into an ASCII string using 64 printable characters. It's commonly used for embedding data in URLs, encoding email attachments, and transmitting binary data over text-based protocols.
Use URL encoding when passing data through query strings, handling form submissions, working with APIs, or when URLs contain special characters like spaces, ampersands, or non-ASCII characters such as umlauts or emoji.
HTML entity encoding converts special characters to entity equivalents (e.g., & → &). This prevents browsers from interpreting characters as markup and protects against XSS attacks.
Punycode encodes Unicode characters for Internationalized Domain Names (IDN). For example, münchen.de becomes xn--mnchen-3ya.de, allowing non-ASCII domain names to work within DNS infrastructure.
| Character | Encoded | Description |
|---|---|---|
| (space) | %20 | Space character |
| ! | %21 | Exclamation mark |
| # | %23 | Hash / fragment |
| & | %26 | Ampersand |
| + | %2B | Plus sign |
| / | %2F | Forward slash |
| : | %3A | Colon |
| = | %3D | Equals sign |
| ? | %3F | Question mark |
| @ | %40 | At sign |