Base64 Encoder / Decoder

A free, fast Base64 encoder decoder online free tool. Paste plain text and click Encode to convert it to Base64, or paste Base64 and click Decode to get the original text back. Everything runs in your browser and is fully UTF-8 safe, so accents, Cyrillic, CJK and emoji are handled correctly.

How to use

  1. Paste or type your content into the text box above.
  2. Click Encode to turn plain text into a Base64 string.
  3. Click Decode to turn a Base64 string back into readable text.
  4. Use the Copy button to copy the result to your clipboard.
  5. Hit Clear to reset and start over.

Why use it

Base64 is the standard way to represent binary or text data as ASCII, used in data URIs, JSON payloads, JWTs, Basic Auth headers, email attachments and API tokens. This tool gives developers and SEOs a quick, private way to encode and decode without installing anything or trusting a remote server — the conversion happens locally in your browser and your data is never uploaded. Need encoding and lookups at scale? Explore the Kwinside SERP API and pricing.

Frequently asked questions

Is this Base64 encoder / decoder free?
Yes. The Base64 encoder decoder online free tool runs entirely in your browser with no login, no upload and no credit card. Your text never leaves your device.
Does it handle non-English characters and emoji?
Yes. Encoding and decoding are UTF-8 safe, so accented letters, Cyrillic, CJK characters and emoji are preserved correctly in both directions.
What happens if I paste invalid Base64?
If the input is not valid Base64, decoding fails gracefully and an error message is shown instead of garbled output. Just check the data and try again.
Is my data sent to a server?
No. All encoding and decoding happens client-side in JavaScript. Nothing is transmitted, stored or logged on our servers.

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