Base64 Encoder
Encode text or strings into Base64 format instantly.
How it works
Base64 encoding turns arbitrary binary or text data into a set of 64 safe, printable ASCII characters -- useful whenever data needs to travel through a system that only reliably handles plain text, like embedding an image in a data URI, including binary data in a JSON payload, or passing values through certain APIs and email formats that don't handle raw bytes well.
This encoder converts your input using UTF-8 byte encoding first, so full Unicode text -- accented characters, emoji, non-Latin scripts -- encodes and later decodes correctly, not just plain ASCII.
Encoding happens instantly in your browser via the standard btoa() API; nothing you type is sent anywhere.
Frequently asked questions
Is Base64 encryption?
No. Base64 is a reversible encoding, not encryption -- anyone can decode it back to the original text. Don't use it to protect sensitive data.
Why does Base64 output look longer than my input?
Base64 encodes every 3 bytes of input as 4 characters of output, so the encoded result is roughly 33% larger than the original.
Does this handle emoji and non-English text correctly?
Yes -- the input is UTF-8 encoded to bytes before Base64 encoding, so emoji and any Unicode text round-trip correctly when decoded.
Where is Base64 commonly used?
Embedding images as data URIs in HTML/CSS, encoding binary attachments in email (MIME), API authentication headers (Basic Auth), and passing binary data through text-only fields.