Base64 Encoder/Decoder
UTF-8 Encoding Support: Accurately encode/decode all Unicode characters including Korean, emojis, and special characters.
Standard: RFC 4648 - The Base16, Base32, and Base64 Data Encodings
The Base64 Encoder/Decoder is a tool that converts text data to Base64 format or restores Base64 data to its original text. All processing happens in your browser and data is never sent to our servers.
How to Use
- 1
Select the "Encode" or "Decode" tab at the top.
- 2
In Live mode (default), conversion happens automatically as you type. Switch to Manual mode to convert only when you click the button.
- 3
Enter your text in the input area. UTF-8 encoding supports all Unicode characters including Korean, Chinese, emojis, etc.
- 4
The result is displayed below, and you can copy it to your clipboard using the "Copy" button.
- 5
Use the "Swap" button to exchange input and output and switch modes.
Use Cases
Email Attachment Encoding
Base64 encoding is used in email systems to transmit binary data in text format.
API Data Transfer
When transmitting image or file data in JSON format via REST APIs, Base64 encoding is commonly used.
URL-Safe Data Representation
Safely represent data containing special characters that cannot be included in URLs.
Web Development
Used to embed images as Data URLs in CSS or include inline resources in HTML.
What is Base64?
Base64 is an encoding scheme that represents binary data using only 64 ASCII characters. It is primarily used to transmit binary data over text-based protocols.
Base64 uses A-Z, a-z, 0-9, and two symbols (+, /) for a total of 64 characters to represent data. The = symbol is used for padding when necessary.
During encoding, 3 bytes (24 bits) of data are converted to 4 Base64 characters (6 bits each). This causes the encoded data size to increase by approximately 33% compared to the original.
Base64 is not encryption and provides no security features. It simply converts the representation format of data.
RFC 4648: This tool follows the IETF (Internet Engineering Task Force) RFC 4648 standard, which defines Base16, Base32, and Base64 encoding and was published in October 2006. It uses the browser's btoa/atob functions and TextEncoder/TextDecoder APIs to fully support UTF-8 characters.
Frequently Asked Questions (FAQ)
Q.Is my data safe?
A. Yes, completely safe. All encoding and decoding operations are processed only in your browser, and data is never transmitted to or stored on our servers.
Q.Is Base64 encryption?
A. No, Base64 is not encryption. It is simply an encoding method that converts the representation format of data. Data encoded with Base64 can be easily decoded by anyone, so it should not be used to protect sensitive information.
Q.Why does encoded data appear larger?
A. Base64 encoding converts 3 bytes of data to 4 characters, so the encoded result is approximately 33% larger than the original data. This is normal behavior for Base64 encoding.
Q.Can I encode Korean or special characters?
A. Yes, you can. This tool uses UTF-8 encoding, so it can accurately encode and decode all Unicode characters including Korean, Chinese, emojis, etc.
Q.Can I encode files to Base64?
A. This tool is designed for text-based input. To encode files (images, PDFs, etc.) to Base64, a separate file upload feature is needed. This will be added in a future update.
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