Base64 Encoder
What is Base64 Encoder
Base64 encoding converts text or binary data into a string of 64 printable ASCII characters. It is widely used to safely transmit data in contexts that only support text — such as JSON payloads, email attachments, data URLs in CSS/HTML, and HTTP Authorization headers.
How to use
- Type or paste your text in the input field.
- The Base64-encoded result appears instantly in the output area.
- Click Copy to copy the encoded string to your clipboard.
- Use the Base64 Decoder link below to reverse the operation.
Use cases
A developer building a REST API needs to embed a small image inside a JSON response. Instead of handling binary data, they encode the image bytes to Base64, include it as a string in the JSON, and decode it on the client side using the same standard.
Frequently asked questions
What is Base64 encoding?
Base64 is a scheme that encodes binary data as a sequence of printable ASCII characters using 64 symbols: A–Z, a–z, 0–9, + and /. It is not encryption — anyone can decode it.
Does this encoder handle emojis and accented characters?
Yes. The encoder uses UTF-8 internally via TextEncoder, so it correctly handles any Unicode text including emojis, Chinese characters, and accented letters.
How much bigger is Base64 output compared to the original?
Base64 output is approximately 33% larger than the input. Every 3 bytes of original data become 4 characters in the encoded output.
Is Base64 the same as encryption?
No. Base64 is a reversible encoding with no secret key. Never use it to protect sensitive data — use proper encryption instead.
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