Base64 Encoder/Decoder - Free Online Tool
Encode and decode Base64 strings instantly in your browser
What is Base64 Encoding?
Base64 encoding is a method of converting binary data into ASCII text format using a set of 64 printable characters (A-Z, a-z, 0-9, +, /). It's essential for transmitting binary data over text-based protocols like email, JSON APIs, and web applications.
Why Use Base64?
- 🌐 Web Safe: Transmit binary data in URLs and HTTP headers
- 📧 Email Compatible: Include images and files in email messages
- 📋 JSON Friendly: Embed binary data in JSON without breaking syntax
- 🔒 Data Integrity: Preserve binary data through text-only systems
Common Use Cases
| Scenario | Example |
|---|---|
| Web Development | Embedding images directly in CSS/HTML (data:image/png;base64,...) |
| API Integration | Sending files through REST APIs as base64 strings |
| Configuration Files | Storing certificates, keys, and binary config in YAML/JSON |
| Email Attachments | MIME encoding for email attachments |
| Database Storage | Storing small binary files as text in databases |
How to Use
Encoding Text to Base64
Input: Hello, World!
Output: SGVsbG8sIFdvcmxkIQ==
Decoding Base64 to Text
Input: SGVsbG8sIFdvcmxkIQ==
Output: Hello, World!
Features
✅ Instant Results — Real-time encoding/decoding as you type
✅ Both Directions — Encode to Base64 and decode from Base64
✅ UTF-8 Support — Handle international characters correctly
✅ Large Files — Process large text inputs efficiently
✅ Copy & Paste — One-click copying of results
✅ No Tracking — Your data stays private, never sent to servers
Technical Details
- Character Set: A-Z, a-z, 0-9, +, / (64 characters total)
- Padding: Uses
=characters for proper alignment - Output Size: ~33% larger than original data
- Standards: RFC 4648 compliant
Security Note
⚠️ Base64 is NOT encryption — it's just encoding. Anyone can decode Base64 data easily. For security, use proper encryption before Base64 encoding.
Ready to encode or decode Base64 data?