Base64 Encoder / Decoder — Free Online Tool
Convert any text to Base64, or decode Base64 back to readable text. UTF-8 safe, live conversion, nothing ever leaves your browser.
Base64output
Instant results — no waiting
No sign-up needed
Free forever
How it works
1Choose a mode — Encode text to Base64, or Decode Base64 back to text.
2Type or paste your input above — the result appears live, instantly.
3Copy the result with one tap, or hit Swap to flip the conversion around.
Frequently asked questions
Is my text uploaded to a server?
No. Encoding and decoding happen entirely in your browser using the built-in btoa/atob and TextEncoder APIs — your text never leaves this page.
Does it handle emojis and non-English text?
Yes. Input is first encoded as UTF-8 before Base64 conversion, so emojis, Hindi, Odia, and any other Unicode text round-trips correctly.
What happens if I paste invalid Base64 in Decode mode?
The tool checks the input first and shows a friendly error message instead of decoding garbage — nothing breaks, and you can fix the input and try again.
Base64 (RFC 4648) · UTF-8 safe · 100% local — your text never leaves this page.