Base64 Encoder
Encode any text or string to Base64 format instantly.
data:text/plain;base64,...
## What does Base64 Encoder do? Encode any text or string to Base64 format instantly. This free online tool runs entirely in your browser, ensuring your data stays private.
How to use Base64 Encoder
- 1
Input Data
Type/paste text into the input box, or drag and drop a file into the area.
- 2
Set Options
Toggle URL-safe encoding (replaces + and /) or MIME line breaks (every 76 characters).
- 3
View Results
The Base64 string is generated instantly. You can also view the size increase percentage.
- 4
Copy Output
Copy the raw Base64 string, or copy it as a Data URI (useful for embedding images in HTML/CSS).
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Frequently Asked Questions
What is Base64 encoding?
Base64 converts binary data (like images or documents) into a printable ASCII string format. It's commonly used to embed files directly into HTML or CSS.
What is URL-safe Base64?
Standard Base64 uses the '+' and '/' characters, which have special meanings in URLs. URL-safe Base64 replaces them with '-' and '_' so the string can be safely passed in a web address.
Why did the file size increase?
Base64 encoding represents 3 bytes of data using 4 characters. This inherently increases the total data size by exactly 33.3%.
What is a Data URI?
A Data URI allows you to include data in-line in web pages as if they were external resources. For example, <img src='data:image/png;base64,...'>.
Is my data sent to a server?
No. Everything, including file encoding, happens entirely within your web browser. Your files never leave your computer.