Base64 Encoder

Encode any text — including emoji and non-Latin scripts — into standard Base64.

Base64 Encoder — Base64 represents binary data as printable ASCII characters, which is why it shows up in email attachments, data URLs, authorization headers, and encoded JSON. This encoder converts your text to UTF-8 bytes first, so emoji, accented characters, and CJK scripts all encode correctly — something naive encoders get wrong.

Encoding happens locally in your browser. Your text is never uploaded.

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What is base64 encoder?

Base64 represents binary data as printable ASCII characters, which is why it shows up in email attachments, data URLs, authorization headers, and encoded JSON. This encoder converts your text to UTF-8 bytes first, so emoji, accented characters, and CJK scripts all encode correctly — something naive encoders get wrong.

The result uses the standard alphabet (A–Z, a–z, 0–9, +, /) with = padding, compatible with atob, Buffer, and every mainstream decoder.

How to use it

Type or paste text

Any Unicode text works, including emoji.
Copy the output

The Base64 string updates live; use Copy to grab it.

Examples

Plain ASCII

The classic example.

hello world

Result: aGVsbG8gd29ybGQ=

Unicode

UTF-8 bytes are encoded, not raw code units.

✓ ok

Result: 4pyTIG9r

Frequently asked questions

Is Base64 encryption?

Why does the output end with "="?

What does the output look like?

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Decode Base64 back into readable text, with clear errors for malformed input.

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Percent-encode text for safe use in URLs — as a query value or a full URL.

Last reviewed: 2026-09-18