Why do APIs ask for Base64?

JSON cannot carry raw bytes, so images and audio are often sent as Base64 strings. Many image and speech models on SandBase accept either a URL or a Base64 data URL.

Does it handle emoji and Chinese text?

Yes. Text is encoded as UTF-8 before Base64, and decoded the same way.

Everything runs in your browser. Nothing you paste or open is uploaded.

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Base64 encoder and decoder

Encode text to Base64, decode Base64 to text, or turn a file into a Base64 string or data URL for an API request.

RUNS IN YOUR BROWSERNOTHING UPLOADEDNO WATERMARK

URL-safe

TextBase64

SGVsbG8sIFNhbmRCYXNlIPCfkYs=

Or encode a file

Drop a file to encodeImages, audio, PDFs or anything else up to 25 MB

How to use it

Step 1: Choose Encode or Decode.
Step 2: Paste text, or pick a file to encode.
Step 3: Turn on URL-safe output if the value goes into a URL or a JWT.

Frequently asked questions

Why do APIs ask for Base64?: JSON cannot carry raw bytes, so images and audio are often sent as Base64 strings. Many image and speech models on SandBase accept either a URL or a Base64 data URL.
Does it handle emoji and Chinese text?: Yes. Text is encoded as UTF-8 before Base64, and decoded the same way.
Is my file uploaded?: Everything runs in your browser. Nothing you paste or open is uploaded.