🔄 Base64 File Converter

Professional base64 file converter supporting bidirectional conversion. Upload any file type to get clean base64 encoding, or paste base64 strings to download as files. Perfect for data URIs, email attachments, API payloads, and web development workflows.

Conversion Type:

Choose whether to convert file to base64 or base64 to file

Upload File:

Select any file to convert to base64 (images, documents, etc.)

Base64 Input:

Paste your base64 string here (with or without data URI prefix)

Output Filename:

Specify filename for the decoded file (include extension)

Include data URI prefix:

Add "data:mime/type;base64," prefix for direct HTML usage

Include data URI prefix

Use URL-safe encoding:

Replace + with - and / with _ for URL-safe base64 (RFC 4648)

Use URL-safe encoding

Conversion Result:

🔄 FILE CONVERSION

example.jpg → Base64 String (Ready to Copy)

15.2KB file • Standard Base64 encoding

📄 File Information

Filename

example.jpg

Size

15.2 KB

Type

image/jpeg

🔤 Base64 Output

            data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAYEBQYFBAYGBQYHBwYIChAKCgkJChQODwwQFxQYGBcUFhYaHSUfGhsjHBYWICwgIyYnKSopGR8tMC0oMCUoKSj/2wBDAQcHBwoIChMKChMoGhYaKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCj/wAARCABQAFADASIAAhEBAxEB/8QAHwAAAQUBAQEBAQEAAAAAAAAAAAECAwQFBgcICQoL...
        

💻 Usage Examples

HTML Data URI

                    <img src="data:image/jpeg;base64,/9j/4AAQ...">
                

CSS Background

                    background: url(data:image/jpeg;base64,/9j/4AAQ...);
                

🔧

JavaScript Required:

This base64 converter requires JavaScript for file processing and base64 conversion operations.

How to Use This Base64 File Converter

The Base64 File Converter enables bidirectional conversion between files and base64 strings. Upload any file type to get a clean base64 encoding, or paste base64 strings to download them as files. Perfect for web development, data URIs, email attachments, and API integrations.

Perfect for:

Creating data URIs for HTML images and CSS backgrounds
Embedding small files directly in web pages
Email attachment encoding and decoding
API payload preparation for file uploads
Converting base64 strings back to downloadable files

Simply choose your conversion direction, upload a file or paste base64 text, and get instant results with copy-to-clipboard functionality and download options.

How It Works

Base64 encoding is a binary-to-text encoding scheme that converts binary data into ASCII text format. Here's how our Base64 File Converter works:

File to Base64: Upload any file, and the tool reads it as binary data then converts to base64 using the browser's native encoding functions
Data URI Creation: Automatically detects file type and creates proper data URI format with MIME type prefix
Base64 to File: Paste base64 strings (with or without data URI prefix) and decode back to binary data
File Download: Creates downloadable blob from decoded data with specified filename and proper MIME type
Format Options: Supports standard base64 and URL-safe encoding for different use cases

All processing happens locally in your browser - no files are uploaded to servers, ensuring complete privacy and security for your data.

When You Might Need This

• Web developers creating data URIs for small images, icons, and CSS background images to reduce HTTP requests
• Email systems encoding file attachments as base64 for MIME message transmission and decoding received attachments
• API integrations sending file data as base64 strings in JSON payloads for image uploads and document processing
• Mobile app developers embedding small assets directly in application code to avoid external file dependencies
• Database administrators storing small binary files as base64 text in database fields for easy retrieval
• Security researchers analyzing base64-encoded malware samples and decoding suspicious file attachments
• Content management systems converting uploaded media files to base64 for inline HTML embedding
• DevOps engineers encoding configuration files and certificates as base64 strings for container environments
• QR code generators converting images and logos to base64 for dynamic QR code generation with embedded graphics
• Backup solutions encoding critical files as base64 text for storage in text-based systems and cloud services

Frequently Asked Questions

What is Base64 encoding and when should I use it?

Base64 is a encoding scheme that converts binary data to ASCII text using 64 characters (A-Z, a-z, 0-9, +, /). Use it when you need to include binary data in text-based formats like HTML data URIs, JSON APIs, email attachments, or when storing files in databases as text.

Are there file size limits for base64 conversion?

While our tool can handle files up to 10MB, remember that base64 encoding increases file size by approximately 33%. For web use, keep images under 10KB for optimal performance. Large files may cause browser memory issues and slow page loading when embedded as data URIs.

What's the difference between standard and URL-safe base64?

Standard base64 uses + and / characters which can cause issues in URLs. URL-safe base64 replaces + with - and / with _ to make the encoded string safe for URLs, filenames, and query parameters without URL encoding.

Can I convert base64 strings back to files without knowing the original file type?

Yes, but you'll need to specify the correct filename with extension. If the base64 includes a data URI prefix (data:image/jpeg;base64,...), we automatically detect the MIME type. Without this prefix, you should know the original file type to set the proper extension.

Is it safe to use this tool for sensitive files?

Yes, all conversion happens locally in your browser using JavaScript - no files are uploaded to our servers. Your data never leaves your computer. However, remember that base64 is encoding, not encryption, so encoded data can be easily decoded by anyone with the base64 string.