Base64 Encoder / Decoder
Encode text and files to Base64, or decode Base64 back to text and files — all in your browser. No uploads, no tracking.
Base64 Encoder/Decoder
Encode and decode Base64 for text and files with instant previews. 100% client-side processing, no uploads, completely private and secure.
Key Features
Professional-grade tool designed for speed, security, and simplicity
Encode & Decode
Convert text and files to Base64 or decode Base64 back to original format.
File Support
Handle images, documents, and any file type for Base64 encoding.
Privacy Protected
All encoding and decoding happens locally. No uploads to any server.
How It Works
Simple browser-based Base64 encoding and decoding process.
Choose Mode
Select whether you want to encode (text/file to Base64) or decode (Base64 to text/file).
Input Your Data
Paste text, drag a file, or upload content to be encoded or decoded.
Get Results
Instantly see the Base64 output or decoded content. Copy or download the result.
Common Use Cases
Data URLs
Embed images, fonts, or files directly in HTML, CSS, or JSON.
API Integration
Send binary data through text-based APIs and webhooks.
Email Attachments
Encode files for MIME email attachments and inline content.
Technical Information
Processing Method
Uses browser native atob() and btoa() functions for text, and FileReader API for file encoding. Binary data converted to Base64 using RFC 4648 specification.
Requirements
Modern web browser with JavaScript enabled and FileReader API support.
Compatibility
Works with all file types. Output compatible with all Base64 decoders and RFC 4648 compliant systems.
Performance
Text encoding is instant. Files up to 50MB processed in seconds. Larger files may take longer depending on device performance.
Security & Privacy
Data Handling
All encoding and decoding operations happen entirely in your browser. Files and text never leave your device.
Privacy Protection
Zero data collection or storage. No tracking, no server uploads, complete privacy guaranteed.
Security Recommendations
Base64 is NOT encryption - it's easily reversible. Never use Base64 alone to protect sensitive data. Use proper encryption (AES, RSA) for security.
Similar Tools
Tools for encoding and decoding data formats.
Understanding Base64
A quick primer on how Base64 encoding works and where it should (and shouldn't) be used.
What is Base64?
Base64 is a binary-to-text encoding that represents binary data using a 64-character ASCII alphabet. It's commonly used to embed images or transmit binary data in text formats (e.g., JSON, XML, data URLs).
How it Works
Data is processed in 3-byte (24-bit) chunks and mapped to four 6-bit values, each represented by an ASCII character. If the input isn't divisible by 3, padding characters (=) are appended.
Limitations & Security
Base64 is not encryption — it's reversible and should not be used to protect secrets. It increases data size by ~33%. For confidentiality, use proper encryption instead.