Built by Switch Labs
Base64 Encoder & Decoder
Encode and decode Base64 strings instantly. Free online tool for text, files, and images. Client-side processing ensures complete privacy—your data never leaves your browser.
- Text & file encoding
- Image preview support
- Drag & drop upload
Input
0 characters
Base64 Output
0 characters
What is Base64 Encoding?
Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It uses 64 different characters (A-Z, a-z, 0-9, +, /) to encode data, making it perfect for transmitting binary data over text-based protocols.
Common Uses for Base64
- 1Embedding Images in HTML/CSS: Convert images to Base64 data URIs to embed them directly in your HTML or CSS files, eliminating additional HTTP requests.
- 2Email Attachments: MIME email protocols use Base64 to encode binary attachments for transmission over text-based email systems.
- 3API Data Transfer: Many APIs use Base64 to encode binary data like images, PDFs, or other files in JSON responses.
- 4Authentication Tokens: OAuth tokens and other authentication credentials are often Base64 encoded for secure transmission.
Advanced Features
URL-Safe Base64
Perfect for URL parameters and file names. Replaces + with -, / with _, and removes padding =.
Line Wrapping
Choose 64 or 76 character line wrapping for MIME compatibility and better readability in emails and configuration files.
Multiple Encodings
Support for UTF-8, ASCII, Latin-1, and UTF-16 character encodings to handle international characters and legacy systems.
Image Preview
Automatically detects and previews encoded images, making it easy to verify your Base64 image data before embedding.
Perfect for Developers & Designers
Whether you’re embedding images in HTML/CSS to reduce HTTP requests, working with API responses that include binary data, or need to encode files for transmission, this tool provides a fast, secure, and private way to encode and decode Base64 data. All processing happens locally in your browser—your files and data never leave your device.
Privacy First
All encoding and decoding operations are performed entirely in your browser using client-side JavaScript. Your files, images, and data are never uploaded to any server, ensuring complete privacy and security.