Base64 File Encoder

Convert any file to Base64 format instantly. Supports all file types including documents, archives, executables, and binary files. Perfect for embedding files in JSON, APIs, or data URIs.

🔒 Privacy First: All encoding happens locally in your browser. Your files never leave your device or get uploaded to any server.

Select File to Encode

Selected:

Base64 Output

Encoded Base64 String (first 1000 characters)

✓ Copied to clipboard!

File Name:

File Type:

Original Size:

Base64 Length: characters

Size Increase: %

What is Base64 File Encoding?

Base64 file encoding converts any file into a text string using Base64 format. This allows binary files to be transmitted through text-based systems like JSON APIs, email, or embedded in HTML and CSS. The encoding process converts raw file bytes into ASCII characters that are safe for text transmission.

Common Use Cases

API Data Transmission: Send files through JSON APIs by encoding them as Base64 strings in request/response payloads.

Email Attachments: Embed small files directly in email messages using MIME Base64 encoding.

Data URIs: Create data URIs for embedding files in HTML, CSS, or JavaScript without external file references.

Database Storage: Store small files directly in database text fields using Base64 encoding.

Configuration Files: Embed binary data or files in configuration files that only support text format.

Supported File Types

This tool supports all file types including:

Documents: PDF, DOC, DOCX, XLS, XLSX, PPT, PPTX, TXT, RTF

Archives: ZIP, RAR, 7Z, TAR, GZ

Executables: EXE, DLL, SO, APP

Media: MP3, MP4, AVI, MOV, WAV (Note: Use image-specific tools for images)

Data: JSON, XML, CSV, SQL, DB

File Size Considerations

Size Increase: Base64 encoding increases file size by approximately 33%. A 1MB file becomes ~1.33MB when encoded.

Browser Limitations: Very large files (over 50MB) may cause browser performance issues or memory errors. For large files, consider splitting them or using server-side encoding.

Recommended Use: This tool works best for files under 10MB. For larger files, consider using command-line tools or server-side encoding.

Privacy and Security

Your files are processed entirely in your browser using JavaScript File API. No file data is ever sent to any server. All encoding happens locally on your device, ensuring complete privacy for sensitive or confidential files.