Base64 Encoder / Decoder
Convert text to Base64 or decode Base64 strings back to readable text, in either direction. UTF-8 input is supported so emoji, accented letters, and non-Latin scripts round-trip correctly without corruption. Base64 is the encoding scheme defined in RFC 4648, commonly used to embed binary data in JSON, email (MIME), and data URIs. Everything runs client-side in your browser — no data is uploaded to a server.
Frequently asked questions
What is Base64 encoding used for?
Base64 turns binary data into plain ASCII text so it can travel safely through text-only channels like email, JSON payloads, and URLs — email attachments (MIME), embedded images (data URIs), and API tokens all rely on it.
How do I decode a Base64 string back to text?
Paste the Base64 string into the decode field and the tool converts it back to readable text immediately, handling UTF-8 so accented characters and emoji display correctly.
Why does decoding sometimes fail or show garbled text?
Decoding fails when the input isn’t valid Base64 — for example, incorrect padding or characters outside the A-Z, a-z, 0-9, +, / alphabet — and garbled output usually means the original data wasn’t UTF-8 encoded before it was Base64-encoded.
Is my text sent to a server when I use this tool?
No — encoding and decoding both happen entirely in your browser using client-side JavaScript, so nothing you type is uploaded or stored anywhere.
Is Base64 the same as encryption?
No — Base64 is an encoding scheme, not encryption; it makes binary data text-safe but provides no confidentiality, since anyone can decode it without a key.