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Base64 Encode/Decode

Encode text to Base64 or decode Base64 back to text. Unicode-safe, with a URL-safe option.

Processed in your browser. Nothing you enter is uploaded.

Text is converted as UTF-8, so emoji and non-Latin scripts round-trip correctly.

How to use it

  1. Choose encode or decode.
  2. Paste your text or Base64 string.
  3. For encoding, optionally choose the URL-safe variant.
  4. Copy the result.

Example

Encode text
Input:hello
Result:aGVsbG8=

What does Base64 Encode/Decode do?

Base64 Encode/Decode converts text to Base64 and back, including emoji and non-Latin scripts, with a URL-safe option.

How does Base64 Encode/Decode work?

Text is converted to UTF-8 bytes and encoded with the js-base64 library, and decoding checks the alphabet, padding and UTF-8 validity. Everything runs in your browser.

Is my data uploaded?

No. Your text is converted in your browser and is never sent anywhere.

Which formats and inputs does Base64 Encode/Decode support?

Inputs: Text to encode, or a standard or URL-safe Base64 string to decode. Output: The encoded Base64 string, or the decoded text.

What are the limits and limitations of Base64 Encode/Decode?

Limits: maximum input 5,000,000 characters; tested with 10,000 mixed Unicode characters. Decoded bytes that are not valid UTF-8 text, such as an image, are reported as an error.

More questions

Does it handle emoji and non-Latin text?

Yes. Text is converted as UTF-8 before encoding, so it round-trips losslessly.

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