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.
Related Tools
JSON Formatter
Online JSON formatting, validation, and compression tool. Features syntax highli...
UUID Generator
Online UUID v4 and ULID generator. Supports batch generation and one-click copy....
RegEx Tester
Online regular expression testing tool. Real-time match highlighting with common...
Color Picker
Online color picker and converter. Supports HEX, RGB, and HSL format conversion....