Free Base64 Encoder / Decoder Online
Encode and decode Base64 instantly. Secure, fast and fully client-side.
What is Base64 Encoding?
Base64 is a binary-to-text encoding scheme that converts binary data into an ASCII string format. It is commonly used to encode data for safe transmission over text-based protocols such as HTTP, email, and JSON APIs.
Base64 encoding ensures that binary data such as images, files, or encrypted values can be transferred without corruption.
Why Use a Base64 Encoder / Decoder?
Developers frequently need to encode or decode Base64 when working with APIs, authentication tokens, embedded images, or configuration files.
This tool allows instant encoding and decoding directly in your browser. No data is uploaded to any server, ensuring complete privacy and security.
Developer Use Cases
- Encoding images for embedding in HTML
- Decoding API tokens
- Handling file uploads in REST APIs
- Preparing authentication headers
FAQ
Is my data secure?
Yes. All processing occurs locally in your browser.
Can I encode large files?
Yes, but performance depends on your system memory.
What is Auto Detect mode?
The tool detects whether the input appears to be Base64 and automatically decodes or encodes accordingly.