🔐 Base64 Encoder/Decoder
Encode & decode text, files & images instantly
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All file types supported
Perfect for data URLs
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Output Result
💡 What is Base64?
Base64 encodes binary data as ASCII text. Used for emails, data URLs, API transmission, and embedding images.
Why Use Our Base64 Encoder/Decoder?
Instant
Encode/decode in milliseconds
Text Support
Encode text to Base64 or decode back
File Encoding
Convert any file to Base64
Image Support
Encode images to data URLs
100% Private
All data stays in your browser
No Limits
Encode files of any size
What is Base64 Encoding?
Base64 encodes binary data into ASCII text format using 64 printable characters (A-Z, a-z, 0-9, +, /). This allows binary information to be safely transmitted and stored across systems that only support ASCII text. Perfect for converting data to formats compatible with all platforms. For color-based data, try our color code converter.
Why Use Base64?
- Email: Send binary files through email systems
- Data URLs: Embed images in HTML/CSS without external files
- APIs: Transmit binary data over HTTP safely
- Authentication: Encode username:password credentials
- Storage: Store binary data in text-based databases
Encoding vs Decoding
Encoding (Text → Base64)
Converts readable text or binary data into Base64 format. The output looks like random characters but contains all information needed to reconstruct the original data. This process is essential for data transmission across different systems and platforms. Use our percentage calculator to calculate size increase ratios.
Example: Text Encoding
Original: Hello World
Encoded: SGVsbG8gV29ybGQ=
Decoding (Base64 → Text)
Reverses encoding, converting Base64 strings back to original format. Used when receiving encoded data that needs to be read or used.
Example: Text Decoding
Encoded: SGVsbG8gV29ybGQ=
Decoded: Hello World
Common Uses
Email Attachments
SMTP protocols originally supported only ASCII text. Attachments convert to Base64 automatically. Your email client decodes them when received.
Data URLs for Web Images
Embedding images as Base64 eliminates separate image files. Useful for logos, icons, and inline email marketing. Perfect for optimizing website performance. For health tracking applications, consider using our BMI calculator with Base64 encoded data.
API Authentication
APIs use Base64 to encode credentials for Basic Authentication. The string transmits in HTTP headers safely. For strong credential generation, use our password strength checker before encoding.
JSON API Payloads
APIs transmit binary data as JSON using Base64 encoding. This allows binary data in text-based JSON format. Track your API documentation with our word counter tool for better content management.
Size Increase
Important: Base64 encoding increases size by approximately 33%. The 3 bytes of binary data need 4 Base64 characters to represent. For large-scale data projects, use our financial calculator to estimate bandwidth costs.
Privacy & Security
All data processes locally in your browser using JavaScript. Data never leaves your device, reaches servers, or gets logged. You have complete privacy and control.