Compare original file sizes with Base64 encoded sizes. Understand the compression overhead for different file types.
Upload any file to compare its original size with Base64 encoded size
Supports all file types (Max 10MB) - Images, documents, text files, and more
Base64 encoding is not compression - it's actually encoding that increases file size by approximately 33%. This tool helps you understand the size impact of Base64 encoding on different file types and sizes.
The overhead comes from converting binary data (8 bits per byte) into ASCII text (6 bits per character), requiring approximately 4 Base64 characters for every 3 bytes of original data. This makes binary data text-safe for transmission through text-only protocols but at the cost of increased size.
Test Base64 impact before embedding images in CSS/HTML
Analyze size overhead for HTML email attachments
Evaluate Base64 payload sizes for API endpoints
Compare encoding overhead across different file types
No, Base64 is an encoding algorithm that increases file size by ~33%. It makes binary data text-compatible but doesn't compress it.
Base64 converts 8-bit bytes to 6-bit ASCII characters, requiring 4 characters to represent 3 bytes, resulting in a 33% size increase.
For small files (< 100KB), convenience often outweighs the size overhead. It's also useful when you need text-safe encoding for systems that don't support binary data.
Absolutely! This Base64 compression test tool is completely free with no limitations, registration, or hidden costs.