Base64 Encoder/Decoder - Encode & Decode Base64 Online Free
Encode text to Base64 or decode Base64 strings back to text instantly. Free online Base64 encoder and decoder tool for developers.
Base64 Encoder and Decoder
About This Base64 Encoder/Decoder
Our free online Base64 encoder and decoder helps developers convert text to Base64 format and back instantly. Perfect for encoding data for APIs, email attachments, data URIs, and secure data transmission. Fast, accurate, and 100% private.
Key Features
Switch between encoding text to Base64 and decoding Base64 back to text with one click.
Real-time encoding and decoding as you type or paste. No waiting, no delays.
Copy encoded or decoded results to clipboard with a single click.
All encoding happens in your browser. Your data never leaves your device.
How to Use the Base64 Encoder
- Choose Mode: Click "Encoder" to encode or "Decoder" to decode
- Paste Data: Enter your text or Base64 string in the input box
- View Result: The conversion happens automatically in real-time
- Copy Result: Click "Copy Result" to copy the output to clipboard
What is Base64 Encoding?
Base64 is an encoding scheme that converts binary data into ASCII text format using 64 printable characters (A-Z, a-z, 0-9, +, /). It's widely used in web development and data transmission.
Why Use Base64 Encoding?
- Email Attachments: Encode binary files for email transmission (MIME)
- Data URIs: Embed images and files directly in HTML/CSS
- API Communication: Send binary data in JSON or XML
- Authentication: Encode credentials for HTTP Basic Auth
- Data Storage: Store binary data in text-based databases
- URL Safety: Make binary data URL-safe for transmission
Common Use Cases
Convert images to Base64 for inline embedding in HTML or CSS without external files.
Encode username:password for HTTP Basic Authentication headers.
Encode attachments and special characters for email transmission.
Create data URIs for embedding resources directly in web pages.
Base64 Format Explained
Base64 uses 64 characters to represent data:
- A-Z: Uppercase letters (26 characters)
- a-z: Lowercase letters (26 characters)
- 0-9: Digits (10 characters)
- +, /: Special characters (2 characters)
- =: Padding character
Important Notes
- Base64 increases data size by approximately 33%
- It's encoding, not encryption (not secure by itself)
- Padding (=) is added to make length divisible by 4
- URL-safe Base64 uses - and _ instead of + and /
Related Tools
Enhance your encoding workflow with these related tools: