FreeToolsWorld

Base64 Encoder

Convert text to Base64, with full Unicode support.

Encoding & Conversion Free, no sign-up Runs in your browser
0 B
Input size
0 B
Encoded size

About the Base64 Encoder

Base64 is a way of writing arbitrary data using only 64 safe characters: the letters A to Z in both cases, the digits, plus and slash, with equals signs used as padding. It exists because many older systems can carry text reliably but mangle raw binary. Encoding to Base64 lets data pass through email headers, URLs, JSON fields, HTML attributes and config files without being corrupted.

This encoder handles Unicode properly. Text is converted to UTF-8 bytes before encoding, which means accented characters, Arabic, Chinese and emoji all survive the round trip. A naive encoder that skips that step throws an error on anything outside the Latin alphabet, which is the most common frustration people hit elsewhere.

Base64 is an encoding, not encryption. Anyone can decode it instantly, so it hides nothing. Use it to move data safely between systems, never to protect a secret.

How to use the Base64 Encoder

  1. Enter your textPaste or type whatever you want to encode.
  2. Choose URL-safe if you need itURL-safe mode swaps plus and slash for hyphen and underscore so the result can sit in a query string.
  3. Read the Base64 outputThe encoded string appears immediately and updates as you type.
  4. Copy itUse the copy button to take the encoded string.

Features

  • Full UTF-8 support, so emoji and non-Latin scripts work
  • Standard and URL-safe alphabets
  • Optional padding removal
  • Live encoding as you type
  • Shows input and output byte sizes
  • Copy the result in one click
  • No upload, no account

Who uses this tool

The base64 encoder is used by writers, developers, students, marketers and anyone else who needs the job done once without installing software. Common cases include:

  • Embedding a small image or font inside a CSS or HTML file
  • Passing structured data through a URL parameter
  • Storing a token or payload in a JSON field safely
  • Preparing basic authentication headers for testing
  • Moving text through systems that strip unusual characters

Frequently asked questions

Is Base64 a form of encryption?

No. It is a reversible encoding with no key and no secret. Anyone who sees a Base64 string can decode it in a second. Never use it to protect passwords, tokens or personal data.

Why does Base64 make my data bigger?

Every three bytes of input become four characters of output, so encoded data is about thirty-three percent larger than the original, plus padding. That overhead is the price of making the data safe to transport as text.

What is URL-safe Base64?

The standard alphabet includes plus and slash, which both have special meanings in URLs. URL-safe Base64 replaces them with hyphen and underscore so the string can be dropped into a query parameter or a path without further escaping.

Why do some Base64 strings end in equals signs?

Base64 works in blocks of three bytes. When the input length is not a multiple of three, equals signs pad the final block so decoders know where the real data ends. Some systems prefer padding removed, which this tool can do.

Can I encode an image or a file here?

This tool encodes text. To embed an image as a data URI, compress it first with the Image Compressor and then use a tool designed for file-to-Base64 conversion.

Does my text get uploaded?

No. Encoding runs in your browser using built-in functions, so the text never leaves your device.

If the base64 encoder is not quite what you need, these other free tools solve closely related problems.

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