Data & Conversion
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Base64 Encoder & Decoder
Encode and decode text and binary files to Base64 format client-side with UTF-8 safety and instant download.
File Processing
Raw Text Input 0 Bytes
Base64 Encoded Output 0 Bytes
Overview
Base64 is a binary-to-text encoding scheme that translates arbitrary binary data into an ASCII string format suitable for HTTP transmission, JSON serialization, and inline CSS embedding.
Features
- UTF-8 Unicode Safe: Accurately handles emojis, foreign language scripts, and special symbols.
- Data URI Generator: Formats files into ready-to-paste Data URIs for HTML
<img>tags or CSSbackground-imageproperties. - Binary Reconstitution: Decodes Base64 payloads back into downloadable binary files.
Key Capabilities
- ✓ Full UTF-8 unicode encoding and decoding without mangled multi-byte characters
- ✓ File-to-Base64 conversion with Data URI scheme generation (images, documents, audio)
- ✓ Base64-to-file binary decoding and direct browser download
- ✓ Live input/output byte count and expansion ratio calculation
- ✓ Strict browser-side execution with zero external data sharing
Frequently Asked Questions
Why does Base64 make the output larger than the original input?
Base64 encoding represents binary data using 6 bits per character, resulting in a predictable 33% increase in payload size.
Can I convert images to Data URIs for inline CSS/HTML?
Yes, drop any image into the tool to instantly generate a ready-to-use 'data:image/...;base64,...' string.