Base64 Encoder / Decoder
Switch between Encode and Decode mode, then paste your text. The tool converts plain text to Base64 encoding or decodes Base64 strings back to readable text. It handles full UTF-8 including accented characters, emojis, and international alphabets. No data is sent to any server — everything happens in your browser.
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[1 suggestions]About the Base64 Encoder / Decoder
Base64 is a binary-to-text encoding scheme that represents binary data as a string of printable ASCII characters. It is used extensively in web development: embedding small images as data URIs in CSS, transmitting binary payloads in JSON APIs, encoding email attachments (MIME), and storing credentials in HTTP Basic Authentication headers. This tool uses the browser's native btoa() and atob() functions, wrapped with a TextEncoder/TextDecoder pipeline to support full UTF-8 — without this pipeline, characters outside the Latin-1 range (accented letters, CJK characters, emojis) would cause encoding errors. The encoded output is approximately 33% larger than the original input because three bytes of binary data are represented as four Base64 characters. Invalid Base64 input in decode mode triggers a clear error message rather than producing corrupted output.
Does this tool support UTF-8 and international characters?▾
Yes — the encoder properly handles complete UTF-8 character encoding, including accented letters (é, ñ), CJK characters, and emojis. They are encoded correctly without truncation or corruption.
Is my data secure when using this tool?▾
Completely — all encoding and decoding happens in your browser using JavaScript's built-in btoa/atob functions. No text or encoded data is transmitted over the network.
What happens if I paste invalid Base64 in decode mode?▾
The tool will display an error message ("Invalid Base64 input") instead of garbled output. You can fix the input and try again.