Base64 Encode/Decode
Convert between text and Base64 encoding, supports Chinese and files
Original Text
Base64 Result
Features
Professional Base64 encode/decode tool
Chinese Support
Perfect support for Chinese character encoding/decoding, using UTF-8 encoding to ensure no character loss
File Encoding
Support direct file upload for Base64 encoding, suitable for images and other binary files
Quick Swap
One-click swap input and output for convenient multiple encode/decode operations
Instant Processing
Local browser processing, no server response wait, encode/decode completed instantly
Standard Encoding
Uses standard Base64 encoding algorithm, compatible with various programming languages and platforms
Privacy & Security
All data is processed locally in your browser, never uploaded to any server
Frequently Asked Questions
Common questions about Base64 encoding/decoding
What is Base64 encoding?
Base64 is an encoding method that converts binary data into printable ASCII characters. It uses 64 characters (A-Z, a-z, 0-9, +, /) to represent data, commonly used to transmit binary data in text protocols, such as email attachments, Data URLs, JWT Tokens, etc.
Will data grow after Base64 encoding?
Yes, Base64 encoding will increase data size by approximately 33%. This is because every 3 bytes of original data will be encoded into 4 characters. Although the size increases, it allows data to be safely transmitted in text environments.
Why does it show "Invalid Base64 string" when decoding?
This is usually because the input string is not in valid Base64 format. Please check: • Whether the string contains illegal characters (only A-Z, a-z, 0-9, +, /, = are allowed) • Whether the string length is a multiple of 4 • Whether characters were missed or extra spaces were copied
How to convert an image to Base64?
Click the "Upload File" button to select an image file, and the tool will automatically convert the image to a Base64 encoded string. If you need to use it in HTML or CSS, you can add a Data URL prefix in the format: data:image/png;base64,{Base64String}
Is Base64 encoding secure? Can it be used for encryption?
Base64 is not an encryption algorithm, it is just an encoding method that anyone can easily decode. Its purpose is to convert binary data to text format for transmission, not to protect data security. If you need to protect sensitive data, please use real encryption algorithms such as AES, RSA, etc.