Private by design: encoding runs in your browser and is not uploaded to ShishwaLab servers.
Enter text or Base64.
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Base64 Encoder / Decoder
Encode and decode Base64 with UTF-8 support and optional URL-safe alphabet—fully local. Free, fast, and built for a clean browser workflow.
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About this tool
The ShishwaLab Base64 Encoder/Decoder converts text to and from Base64 using UTF-8 bytes, so Unicode characters round-trip correctly.
URL-safe mode swaps +/ for -_ and trims padding on encode, then restores standard Base64 before decode.
Conversion is local. Your text is not uploaded to ShishwaLab servers.
Tips for better results
- Use standard Base64 for data URLs and most APIs; use URL-safe when embedding in query strings.
- Decode errors usually mean missing padding or mixed alphabets—try toggling URL-safe.
- Large inputs are capped for performance; split oversized blobs if needed.
- Base64 is encoding, not encryption—do not treat it as a secrecy control.
How to use
- 1 Paste plain text to encode or Base64 to decode.
- 2 Optionally enable URL-safe Base64, then Encode or Decode.
- 3 Copy or download the output, or reset.
FAQ
Is this Base64 tool free?
Yes. Encode and decode in your browser with no signup.
Does it support UTF-8?
Yes. Text is encoded and decoded as UTF-8 bytes.
What is URL-safe Base64?
A variant that uses - and _ instead of + and /, often without padding, for URLs.
Is my text uploaded?
No. Encoding and decoding stay in your browser.
Can I copy or download?
Yes. Copy the output or download a text file.
Why did decode fail?
Check alphabet, padding, and whether URL-safe mode matches the source string.