Skip to main content
DevCodivo

Base64 Encoder

Encode text to Base64 with full Unicode support. Fast, free and runs entirely in your browser.

Runs in your browser — your data never leaves your deviceFree, no sign-up
Base64 output

The Base64-encoded text will appear here.

How it works

Base64 converts arbitrary bytes into a string built from 64 safe characters (A–Z, a–z, 0–9, + and /). Every 3 bytes of input become 4 output characters, with = padding at the end when the input length is not a multiple of 3.

This tool first converts your text to its UTF-8 byte representation and encodes those bytes, which is exactly what standard tools and APIs expect — and what makes Unicode work correctly.

Features

  • Full Unicode support (UTF-8), including emoji
  • Standard RFC 4648 alphabet with padding
  • Copy, download and upload actions
  • Input size guard with clear error messages
  • 100% client-side — nothing leaves your browser

How to use

  1. Paste or type the text you want to encode.
  2. Press Encode to Base64.
  3. Copy the result or download it as a text file.

Example

Input:  Hello, World!
Output: SGVsbG8sIFdvcmxkIQ==

Frequently asked questions

Is Base64 encryption?
No. Base64 is an encoding, not encryption. It converts binary data into plain-text ASCII characters so it can travel through text-only channels — anyone can decode it instantly. Never use Base64 to protect secrets; use real encryption for that.
Does this tool handle Unicode characters?
Yes. The text is first converted to UTF-8 bytes and those bytes are then Base64-encoded, so accented characters, emoji and non-Latin scripts encode and decode correctly. This matches the behaviour of every standard Base64 implementation.
Why does Base64 output get longer than the input?
Base64 represents every 3 bytes of input with 4 characters, so the output is roughly 33% larger (plus possible line breaks). This is inherent to the format and expected.
Where is Base64 used?
Common uses include embedding images or fonts in CSS and HTML (data URLs), encoding binary attachments in email (MIME), HTTP Basic authentication headers, and transmitting binary data in JSON or XML payloads.
Is my text sent to a server?
No. Encoding happens entirely in your browser with JavaScript. Nothing you type is transmitted anywhere — you can verify this in your browser's network inspector.

Related tools