Base64 Encoder / Decoder
Online Base64 encoding and decoding tool. Supports text-to-Base64 conversion. Your data never leaves your device.
How to Use Base64 Encoder / Decoder
Paste text in the input box and click "Encode" for Base64 encoding or "Decode" to decode. Supports proper encoding/decoding of Unicode characters including Chinese. All computation happens in your browser — your data never leaves your device.
FAQ
What is Base64 encoding?
Base64 is a method of converting binary data to ASCII string format, commonly used for transmitting images, files, and other binary content in text-based protocols. It encodes every 3 bytes into 4 printable characters and is widely used in email attachments, Data URIs, and API data transmission.
Is my data uploaded to a server?
No. All ToolZen tools run locally in your browser. Your data stays on your device.
How much does Base64 encoding increase data size?
Base64 encoding increases data size by approximately 33%. This is because every 3 bytes of original data are encoded into 4 bytes. If your application has strict data transfer requirements, use Base64 encoding only when necessary.