Base64 Encoder / Decoder
Encode and decode text, files, and Data URLs safely with full UTF-8 Unicode support and URL-safe variants. 100% client-side.
How ecsot Base64 Encoder / Decoder Works
Choose Mode
Switch between Encode (Text/File to Base64) and Decode (Base64 to Plain Text/Binary).
Enter Data or Drop File
Type, paste your payload, or drag and drop any file directly into the workspace.
On-Device UTF-8 Processing
Your browser encodes or decodes in real time using RFC 4648 with zero network transfer.
Copy or Download
Copy the result straight to your clipboard or download it as a standalone text/binary file.
Tips for Working with Base64
- •Base64 Size Expansion: Base64 converts 3 bytes of binary data into 4 ASCII characters, resulting in an expected ~33% increase in data size.
- •Full UTF-8 & Emoji Support: Unlike standard browser btoa(), our engine handles all multi-byte Unicode strings, special symbols, and emojis safely.
- •URL-Safe Encoding: Use the URL-Safe option when embedding Base64 strings in query strings or JWTs to replace '+' and '/' with '-' and '_'.
- •100% Private in Browser: All operations execute directly inside your browser session with Web APIs. No strings or files are ever sent over the network.
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