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What is Base64?
Encode and decode Base64 data instantly. Base64 is used in data URIs, email attachments (MIME), API authentication, JWT tokens, and more. Our tool handles encoding and decoding of text and binary data.
Key Features
How to Use Base64
Enter text or upload a file
Select encode or decode
Click Submit to process
Copy the result
Common Use Cases
Tips & Best Practices
Base64 increases size by ~33% — use it only when necessary
Use URL-safe Base64 for data in URLs
Common use: embedding small images in HTML/CSS
Frequently Asked Questions
What is Base64?
Base64 is an encoding scheme that converts binary data into ASCII text using 64 characters (A-Z, a-z, 0-9, +, /). It's used when binary data needs to be transmitted over text-based protocols.
Is Base64 encryption?
No! Base64 is encoding, not encryption. Anyone can decode Base64 data. Never use it to protect sensitive information.
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Base64 is part of our Encoding tools collection at AllInAOne. Use our free online tools for all your encoding needs — no registration required.