About This Base64 File Converter
This online Base64 converter provides a simple way to transform files into Base64-encoded strings and convert them back to downloadable files. Base64 encoding is widely used in web development, email attachments, and data transmission where binary data needs to be represented as text.
Common Use Cases:
• File to Base64: Encode images, PDFs, or any file to Base64 string for embedding in HTML, CSS, or JSON
• Base64 to File: Decode Base64 strings back to downloadable files
• Data URL Generation: Create data URLs with MIME type auto-detection
• Image Preview: Automatically preview images when encoding or decoding
• Binary Data Transmission: Convert binary files for text-based protocols
Supported File Types: Images (PNG, JPG, GIF, SVG, BMP), PDFs, documents, archives (ZIP, GZIP), and any other binary file format. All processing happens locally in your browser for maximum security.
• File → Base64: Select file to automatically encode to Base64 string, supports image preview
• Base64 → File: Paste Base64 string, set filename to download decoded file
• Supports MIME type auto-detection (based on Base64 prefix or binary characteristics)
• Enable Data URL prefix to generate complete data URL with MIME type
• Automatically detects data:text/markdown;base64, etc. prefix and fills file info when decoding
• Image files will automatically show preview
• Large file encoding may take some time, please be patient
Related Tools:
• Integer Base Converter - Convert numbers between different bases
• ASCII Converter - Convert text to ASCII codes
• Hex Color Converter - Convert between hex and RGB colors
Frequently Asked Questions
What is Base64 encoding?
Base64 encoding is a method to convert binary data into ASCII text format. It uses 64 different characters (A-Z, a-z, 0-9, +, /) to represent binary data, making it safe for transmission over text-based protocols like email or HTTP.
Why convert files to Base64?
Base64 encoding is useful for embedding images in HTML/CSS, sending binary data via email, storing binary data in JSON/XML, and working with data URLs. It ensures data integrity during transmission over text-based systems.
Is this tool secure?
Yes! All file processing happens locally in your browser. No files are uploaded to any server, ensuring complete privacy and security for your data.
What file types are supported?
This tool supports all file types including images (PNG, JPG, GIF, SVG, BMP), PDFs, documents, archives (ZIP, GZIP), and any other binary file format. There's no file size limit, though very large files may take longer to process.
Convert Files to Base64 and Back
Our Base64 file converter makes it easy to encode any file to Base64 string and decode Base64 back to downloadable files. Perfect for embedding images in HTML/CSS, transmitting binary data over text-based protocols, or working with data URLs. Supports all file types including images, PDFs, documents, and archives.