Base64 Encoder & Decoder
Encode and decode Base64 strings instantly. Supports standard and URL-safe variants. All processing in your browser—zero uploads.
100% Private
All encoding/decoding happens in your browser. No data is uploaded to any server.
URL-Safe Support
Toggle URL-safe mode for Base64 strings used in URLs, filenames, or cookies.
Always Free
Professional-grade Base64 tool, completely free. No limits, no sign-up required.
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About Base64 Encoding
What is Base64?
Base64 is an encoding scheme that converts binary data into ASCII text format. It's commonly used for transmitting data over text-based protocols like email, JSON, and URLs.
URL-Safe Base64
URL-safe Base64 replaces + with -,/ with _, and removes padding (=) to make it safe for URLs and filenames.
Common Use Cases
- Encoding API keys and tokens
- Embedding images in HTML/CSS
- JWT token payloads
- Email attachments (MIME)
Privacy First
This tool runs entirely in your browser using JavaScript's native btoa() andatob() functions. Your data never touches our servers.