What file types can I convert to Base64?

Any file type! PDFs, Word documents, Excel files, audio, video, fonts, archives - if it's a file, it can be Base64 encoded. The converter handles all binary data.

Is there a file size limit?

Browser memory is the only limit. We recommend files under 10MB for best performance. Large files may cause slowdowns since everything runs in your browser.

What's the output format?

You get a complete data URI with the correct MIME type: data:application/pdf;base64,... This can be used directly in HTML, stored in databases, or processed by APIs.

Will my files be uploaded?

No! Everything happens in your browser. Your files never leave your device. This is especially important for sensitive documents like contracts, IDs, or financial files.

File to Base64 Converter

Convert any file to Base64 encoding. Perfect for embedding PDFs, documents, and other files in web applications.

Select File

Drop any file here

or click to select

Supports all file types (PDF, DOCX, audio, video, etc.)

Base64 Data URI

Supports any file type

Generates complete data URI

Shows file size before/after

Copy Base64 with one click

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Base64 to Image

Convert Base64 strings back to viewable images. Decode data URIs and download as PNG, JPG, or other formats.

Base64 Encoder

Convert any text to Base64 encoding instantly. Perfect for encoding data for URLs, APIs, and data storage.

How to Use the File to Base64

Our file to base64 makes Base64 encoding and decoding simple:

1.Drop any file onto the upload area or click to select
2.See file information including size and type
3.Copy the data URI for use in your application
4.Embed in code or store in databases

Common Use Cases

•Embedding PDFs in HTML
•Storing files in databases
•Including assets in JSON configs
•Email attachment encoding

Why Use Our File to Base64?

•100% Private: All processing happens in your browser
•No Registration: Use immediately without creating an account
•No Limits: Process as much data as you need
•Works Offline: Once loaded, works without internet
•Unicode Support: Full emoji and international character support

Technical Details

Base64 encoding uses a 64-character alphabet to represent binary data as ASCII text. Every 3 bytes of input become 4 characters of output (~33% size increase).

Our tool uses the browser's native btoa() and atob() functions for fast, reliable conversion. Unicode text is first converted to UTF-8.