Base64 Encoder & Decoder
Encode UTF-8 text or decode Base64 and Base64url locally.
Text only, up to 1 MiB. Decoding requires valid Base64 and UTF-8. Base64 is an encoding, not encryption. All processing stays on this device.
Result
Your result will appear here after processing.
How do I use this tool?
Paste text, choose Encode or Decode, and select standard Base64 or URL-safe Base64url. Copy or download the result.
What does it support?
Text only, up to 1 MiB. Decoding requires valid Base64 and UTF-8. Base64 is an encoding, not encryption.
Does my input leave my device?
No. Processing runs locally in your browser. Input and results are kept only on this page and are cleared when you leave, reload or clear the tool. Copy and download happen only when you choose those actions.