String to Base64 Converter
Convert any string to a Base64-encoded value (UTF-8 safe).
Encoders & Decoders Runs in your browser
How do you convert a string to Base64?
A string to Base64 converter turns any string into a Base64-encoded equivalent. Snabbit encodes the string as UTF-8, then maps the bytes to Base64, producing an ASCII-safe value you can store or transmit anywhere. Multi-byte characters expand correctly. The conversion runs in your browser, so your string is never sent to a server.
How to use the String to Base64
- 1 Type or paste your string.
- 2 The Base64-encoded value appears instantly.
- 3 The string is UTF-8 encoded before Base64 encoding.
- 4 Copy the Base64 output.
What you can use it for
- Encoding a string before storing it in a cookie or token.
- Producing Base64 fixtures for unit tests.
- Safely transporting a string through a text-only channel.
- Comparing against your code’s own Base64 output.
Frequently asked questions
How is a string converted to Base64?
The string is encoded to its UTF-8 bytes, and those bytes are grouped into 6-bit chunks that map to the 64-character Base64 alphabet, with = used as padding.
Does it match btoa() in JavaScript?
For plain ASCII strings, yes. For Unicode strings this tool first UTF-8 encodes the text, which avoids the errors raw btoa() throws on characters above code point 255.
Is my string kept private?
Yes. Encoding happens locally in your browser and nothing is uploaded.
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