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Base64 Encoder / Decoder

100% Client-Side

Encode and decode Base64 strings with full Unicode (UTF-8) character and emoji support, plus optional URL-safe Base64 formatting.

URL-safe Base64 (- and _)

Plain Text Input

Base64 Output

How to Use Base64 Encoder / Decoder

Choose Conversion Mode

Select Encode (Text → Base64) or Decode (Base64 → Text).

Enter Text

Type or paste your string into the primary input area.

Copy or Download

Copy the encoded/decoded string or export as a file.

✓ Full UTF-8 Support

Handles foreign languages, accents, symbols, and emojis without encoding corruption.

✓ URL-Safe Mode

Optionally swaps + and / for - and _ to embed Base64 safely in query strings.

✓ Bidirectional Swap

Swap input and output with one click for rapid verification.

🔒 Complete Client-Side Isolation

This tool runs entirely in your local browser runtime. No logs, analytics tracking, or remote server transmissions occur.

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