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Base64 ↔ File Converter

Encode any file as Base64 or decode Base64 back into a downloadable file.

File → Base64

Base64 → File

Base64 File Converter – Encode & Decode Files

Base64 encoding is a fundamental technique used throughout web development, data transmission, and file handling. The Base64 ↔ File Converter by ToolfolioHub provides a simple, secure way to convert any file to Base64 encoding or decode Base64 strings back into downloadable files—all entirely in your browser.

Whether you're embedding images in CSS/HTML, transmitting binary data through text-based protocols, or working with APIs that require Base64 encoding, this tool handles the conversion seamlessly while keeping your files private and secure on your device.

What is Base64 Encoding?

Base64 is an encoding scheme that converts binary data (like images, PDFs, or any file) into a text string using only 64 ASCII characters (A-Z, a-z, 0-9, +, /). This makes it possible to:

  • Embed binary files in text-based formats (HTML, CSS, JSON, XML).
  • Transmit binary data through protocols that only support text (email, HTTP).
  • Store binary data in text-based databases or configuration files.

Base64 encoding increases file size by approximately 33%, but provides universal compatibility across all systems and protocols.

Key Features & Benefits

1. File to Base64 Encoding

Convert any file type to Base64:

  • Images: PNG, JPG, GIF, SVG, WebP—perfect for data URIs in HTML/CSS.
  • Documents: PDFs, Word documents, spreadsheets.
  • Any File Type: Videos, audio files, archives, executables—any binary file.

Simply select a file, and the Base64 string appears instantly—ready to copy and use.

2. Base64 to File Decoding

Convert Base64 strings back into files:

  • Paste a Base64 string into the input field.
  • Optionally specify a filename (e.g., `image.png`, `document.pdf`).
  • Download the decoded file instantly.

3. Client-Side Processing

All conversion happens locally in your browser:

  • Privacy: Files never leave your device—no server uploads.
  • Security: Sensitive files remain secure and private.
  • Speed: Instant processing without network delays.

4. One-Click Copy

Copy Base64 strings to your clipboard instantly for use in code, APIs, or documentation.

How to Use the Base64 File Converter

Encoding a File to Base64

  1. Select a File: Click "Choose File" or drag and drop a file into the file input.
  2. View Base64 Output: The Base64-encoded string appears in the textarea automatically.
  3. Copy the String: Click "Copy Base64" to copy the string to your clipboard.

Decoding Base64 to a File

  1. Paste Base64 String: Paste a Base64-encoded string into the "Base64 → File" textarea.
  2. Set Filename (Optional): Enter a filename with the correct extension (e.g., `image.png`).
  3. Download: Click "Download File" to decode and download the file.

Typical Use-Cases & Audience

Web Developers

Developers use this tool for:

  • Data URIs: Embed small images directly in HTML/CSS (e.g., `url(data:image/png;base64,...)`).
  • API Integration: Convert files to Base64 for APIs that require Base64-encoded payloads.
  • Email Attachments: Encode attachments for email APIs.
  • LocalStorage: Store small files as Base64 strings in browser storage.

Designers

Designers use this tool to:

  • Embed logos and icons directly in CSS.
  • Reduce HTTP requests by inlining small images.
  • Share encoded assets with developers.

Why Choose This Tool over Others?

  • Complete Privacy: All processing happens locally—no file uploads to servers.
  • Universal Compatibility: Works with any file type.
  • Bidirectional: Encode files to Base64 and decode Base64 back to files.
  • No Registration: Use instantly without signing up.

FAQs

What file sizes can I encode?

Browser memory limits apply—typically 2-4GB depending on your device. For large files, consider:

  • Using command-line tools for server-side processing.
  • Chunking large files into smaller pieces.

Most practical use cases (images, small documents) work perfectly in the browser.

Is Base64 secure?

Base64 is encoding, not encryption. It's not secure for protecting sensitive data—anyone can decode it. Use it for data transmission, not security. For sensitive files, encrypt first, then encode.

Why is my Base64 string larger than my file?

Base64 encoding increases file size by approximately 33% because it converts binary data (8 bits per byte) to text (6 bits per character). This is normal and expected.

Get Started Now

Use the tool above to encode files to Base64 or decode Base64 strings back into files. All processing happens securely in your browser.

Conclusion

The Base64 ↔ File Converter is an essential tool for web developers, designers, and anyone working with file encoding. By providing secure, client-side conversion in both directions, it simplifies workflows while maintaining complete privacy and security.