Base64 Encoder / Decoder
Encode & decode Base64 strings
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Full guide
How Base64 Encoding Works (And When to Use It)
Learn what Base64 is, why it adds ~33% size overhead, how encode and decode work, URL-safe variants, data URIs, and why Base64 is not encryption.
About Base64 Encoder / Decoder
A fast, browser-based Base64 encoder and decoder. Converts plain text to Base64 and back with full UTF-8 support, handles URL-safe Base64 variants, generates data URIs for embedding, and detects/validates Base64-encoded input automatically. All processing happens client-side — no data leaves your browser. Includes character count comparison showing the ~33% size overhead, and supports multiline input for large payloads. Essential for web developers, API integrators, email engineers, and anyone working with encoded data.
Base64 Encoder / Decoder Features
- Encode & decode
- UTF-8 safe
- URL-safe variant
- Auto-detection
- Data URI output
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