Base64 Encoder Decoder
Encode and decode Base64 strings and files. Free, fast, and runs 100% in your browser.
Base64 encoding is essential for embedding images in CSS, transmitting binary data in JSON APIs, and handling email attachments. This tool encodes text to Base64 and decodes Base64 back to readable text instantly. Supports both standard and URL-safe Base64 variants. All processing happens in your browser — no data is transmitted.
Feature Overview
| Feature | Details |
|---|---|
| Encode | ✓ |
| Decode | ✓ |
| URL-safe variant | ✓ |
| Real-time | ✓ |
| Privacy | 100% client-side |
Frequently Asked Questions
What is Base64 used for?
Base64 converts binary data into ASCII text for safe transmission in text-based protocols like JSON APIs, email (MIME), and CSS data URIs.
Does encoding increase size?
Yes. Base64 encoding increases data size by approximately 33%. This is the tradeoff for safe text-channel transmission.
Can I encode files?
This tool works with text input. For file-to-Base64, read the file and paste its content.