Text to Base64

Base64 represents arbitrary data using only 64 printable characters. That is useful for embedding text or small content where only simple characters are allowed - such as in data URLs, JSON fields, configurations or email headers. This tool encodes your text to Base64 and decodes Base64 back into readable text.

You choose the direction: text to Base64 or Base64 to text. The text is encoded via its UTF-8 bytes, so umlauts, accents and emojis are preserved correctly. Unlike a file tool, this one works directly with pasted text - ideal for quick conversions without the detour via a file.

A toggle switches to URL-safe Base64 (RFC 4648 section 5): "+" becomes "-", "/" becomes "_", and the "=" padding is dropped. That lets you drop the result straight into a URL, a filename or a cookie value without percent-encoding it further. When decoding, the tool uses whichever alphabet matches the toggle you have set.

The whole conversion runs entirely locally in your browser in pure JavaScript - your text is not uploaded, not stored, and no foreign library is loaded from a CDN. If the Base64 input is invalid when decoding, the tool says so honestly instead of inventing a wrong result.

Specifications

In 3 steps

1. Paste text or Base64 into the text field.
2. Choose the direction (text to Base64 or Base64 to text) and enable URL-safe Base64 if needed.
3. Read the result or download it as a text file.

Limitations: It uses Base64 (RFC 4648) over the UTF-8 bytes of the text, either the standard alphabet (+ /, with padding) or the URL-safe alphabet (- _, without padding). For whole files there are the dedicated encode and decode file tools. When decoding, valid Base64 in the matching alphabet is required, otherwise the tool reports an honest error. Very large texts are limited by your device memory.

FAQ

Related tools

• Encode to Base64
• Escape JSON
• Encode URL