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File to Base64 Converter | Free Online Tool

Convert any file (PDF, ZIP, images, documents) to Base64 text. 100% free, client-side processing with no ads, no tracking, and no cookies.

✓ 100% Ad-Free ✓ Privacy-First ✓ No Signup ✓ Zero Cookies

Drop a file or click to upload

No size limit. Processed locally.

Examples

PDF file encoded for API transmission or storage

Input:

document.pdf (50KB)

Output:

JVBERi0xLjQKJ...

ZIP archive encoded for database storage

Input:

archive.zip (1MB)

Output:

UEsDBBQAAAAIA...

When to Use This

  • Transmitting binary files via JSON APIs
  • Storing files in text-based databases
  • Embedding files in configuration files
  • Preparing files for data URI usage

Related Tools

Base64 Encoder

Encode text and files to Base64

Base64 Decoder

Decode Base64 to original content

Text to Base64

Convert plain text to Base64

Base64 to Text

Decode Base64 to readable text

How It Works

Base64 is a binary-to-text encoding scheme that converts binary data into ASCII characters. The Base64 alphabet uses 64 characters: A-Z, a-z, 0-9, +, and / (with = for padding). This encoding is essential for transmitting binary data over text-based protocols like HTTP, JSON, and XML.

When you encode data, binary bytes are converted to a sequence of Base64 characters, increasing the size by approximately 33%.

Frequently Asked Questions

What file types can I encode?
Any file type. Base64 encoding works on binary data regardless of format—PDFs, ZIPs, images, videos, databases, executables, or any other file.
Is there a file size limit?
There is no hard limit imposed by the tool. However, Base64 increases file size by approximately 33%. For very large files (over 100MB), browser performance may be affected.
Is my file uploaded to a server?
No. All processing happens locally in your browser. Your files never leave your device. Zero cookies, zero tracking, zero ads.
Can I use this for API development?
Yes. Many APIs require binary files to be sent as Base64 strings in JSON payloads. This tool produces the correct Base64 encoding for any file upload scenario.
Why is the output so long?
Base64 encodes 6 bits per character, resulting in approximately 33% more characters than the original binary size. This is normal and expected for all Base64 encodings.
Why is this File to Base64 converter free?
As a professional IT solutions company, our business relies on our core enterprise services, not ad revenue. Because this File to Base64 converter processes your files entirely locally on your device, it costs us virtually nothing to host. This allows us to provide a high-quality, ad-free utility without monetizing your screen time.
Is my file data sold or tracked?
Absolutely not. There is a common saying in tech: "If you are not paying for the product, you are the product." We built this File to Base64 converter specifically to challenge that standard. Because this tool uses 100% client-side processing, your files never even reach our servers. We do not track your usage, use cookies, or harvest your data.

Your Privacy is Protected

All Base64 encoding and decoding happens entirely in your browser. Your text and files never leave your device, are never sent to any server, and are never stored. We use zero cookies, zero tracking, and zero ads.