File to Base64 Converter
Convert any file to Base64 encoded string online. Upload documents, images, audio, or any file type and get Base64 output for embedding or API transmission.
Input
Click to upload or drag and drop
Images, PDFs, text files, JSON, etc.
About This Tool
Mode: encode
URL-Safe: No
Base64 encoding converts binary data to ASCII text, making it safe for text-based systems like JSON, XML, and URLs.
Base64 Output
Enter text to see the Base64 encoded result here.
Frequently Asked Questions
What file types can I convert?
Any file type can be converted to Base64, including documents, images, audio, video, archives, and binary files. The MIME type is preserved in the output.
Is there a file size limit?
While there's no hard limit, very large files (over 10MB) may slow down your browser. For best performance, keep files under 5MB.
Will the original file be preserved perfectly?
Yes! Base64 encoding is lossless. When decoded, the file will be exactly identical to the original with no quality loss.
Can I upload multiple files?
Currently, files are processed one at a time. Upload each file separately and copy the Base64 output before uploading the next.
Practical Examples
Email Attachments
Encode files for MIME attachments in email applications.
API File Upload
Send files as Base64 strings in JSON API request bodies.
Data Storage
Store files in databases or configuration as Base64 strings.
Common Issues & Solutions
If upload fails, try a smaller file or a different file format.
The MIME type is detected from the file and included in the output metadata.
Very large files may cause browser memory issues - consider chunked encoding for large files.
The encoded output will be approximately 33% larger than the original file.