Encode and decode Base64. Supports UTF-8 (Cyrillic, emoji), URL-safe variant, and auto-detects standard vs URL-safe on decode.
base64
encode
decode
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Base64 Toolkit
Encode and decode Base64 with full UTF-8 support.
What it does
- Encode text → Base64 (standard or URL-safe)
- Decode Base64 → text (auto-detects format)
- Handles UTF-8 (Cyrillic, emoji, CJK)
- Adds missing padding automatically
- Detects invalid base64 characters
- Falls back to binary output for non-UTF-8 bytes
Use cases
- API token handling
- Data URL processing
- Email attachment encoding
- JWT debugging
- Binary payload conversion
Privacy
100% in-memory processing. No data stored.