How to Encode Base64 Online
Encode any text or string to Base64 format instantly using our free browser-based tool. No sign-up, no data uploaded.
Steps
Open the Base64 Encoder
Navigate to the Base64 Encoder tool and select the Encode mode.
Enter your text
Paste or type the text you want to encode. The tool accepts any UTF-8 text input.
View the Base64 output
The Base64-encoded string appears instantly. It uses the standard Base64 alphabet (A-Z, a-z, 0-9, +, /) with = padding.
Copy the result
Click the Copy button to copy the encoded string to your clipboard for use in your project.
Understanding Base64
Base64 converts every 3 bytes of input into 4 ASCII characters from a 64-character alphabet. This makes the output roughly 33% larger than the input, but guarantees it is safe to transmit over text-based protocols like HTTP, SMTP, and JSON.
Frequently Asked Questions
Base64 is used to represent binary data as ASCII text. Common uses include embedding images in HTML/CSS, encoding email attachments (MIME), and transmitting data in JSON APIs.
No. Base64 is an encoding, not encryption. Anyone can decode a Base64 string. Do not use it to protect sensitive information.