Base64 Encode / Decode
Need to safely embed an image in CSS or transfer complex data via JSON? Our free Base64 Encoder/Decoder provides instant, secure translation between plain text and Base64 strings.
What is the Base64 Encoder / Decoder - Encode Text Online?
The Base64 Encode/Decode tool is a developer utility that translates ASCII text or binary data into a 64-character alphabet format. This ensures data remains intact without modification during transit across systems that only support text.
How to use the Base64 Encoder / Decoder - Encode Text Online
- Select your desired action: 'Encode to Base64' or 'Decode to Text'.
- Paste your text or Base64 string into the input box.
- The translated string will instantly appear in the output box.
- Copy the result for use in your code.
Example
Encoding the word 'Hello'. The tool converts the binary data of 'Hello' into the Base64 format, resulting in the string 'SGVsbG8='.
Understanding Your Results
The encoded output is a safe string of letters and numbers that will not trigger formatting errors in HTML, URLs, or JSON files. The decoded output is your original, readable data.
Common Use Cases
- Web Development: Encoding small SVG icons or images directly into a CSS file using a Data URI to save HTTP requests.
- API Integrations: Decoding Basic Authentication headers (which are transmitted in Base64) to verify credentials.
- Email Formatting: Decoding raw MIME email bodies to read the text contents.
How it Works
Base64 encoding works by taking 3 bytes of data (24 bits) and splitting them into 4 chunks of 6 bits. Each 6-bit chunk is then mapped to one of 64 safe ASCII characters (A-Z, a-z, 0-9, +, /). Decoding reverses this exact mathematical process.
Tips & Accuracy Notes
- •Base64 is NOT encryption. It provides zero security. Anyone can decode a Base64 string instantly. Never use it to hide passwords without actual encryption.
- •Encoding data to Base64 increases the file size by approximately 33%.
Frequently Asked Questions
Why does my Base64 string end with '='?
The equals sign (=) is used for 'padding'. If the data being encoded doesn't divide perfectly into 3-byte chunks, the algorithm adds equals signs at the end to make up the difference.
Is Base64 secure?
No. Base64 is an encoding scheme, not an encryption algorithm. It is used to safely transport data, not to protect it from being read.
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Disclaimer: Tool processes data locally in the browser using the btoa() and atob() functions. Do not use Base64 as a substitute for secure encryption.