Base64 Encoder / Decoder
Encode and decode text to Base64 online. Support for standard Base64 and URL-safe Base64 with auto-encode on input.
About Base64 Encoder / Decoder
Our free online Base64 Encoder / Decoder is a powerful tool that converts text to and from Base64 encoding. Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format by translating it into a radix-64 representation.
Base64 is widely used in data transmission, email encoding (MIME), embedding images in HTML/CSS, and storing complex data in XML or JSON. It ensures that data remains intact without modification during transport, making it essential for web development and data exchange.
This tool processes your input entirely in the browser using JavaScript, ensuring your data never leaves your device. Encode or decode Base64 instantly with support for both standard Base64 and URL-safe Base64 variants.
The auto-encode/decode feature updates the output in real-time as you type, making it convenient for quick conversions. You can also swap input and output for bidirectional conversion with a single click.
Features
Fast Encoding
Encode and decode Base64 instantly with no registration or limits. Completely free to use.
Auto-Calculate
Automatically update the output as you type for real-time Base64 conversion.
URL-Safe Base64
Support for URL-safe Base64 encoding using - and _ instead of + and /.
Swap Input/Output
Quickly swap input and output for easy bidirectional conversion.
One-Click Copy
Copy the encoded or decoded result to clipboard with a single click.
Privacy First
All processing happens in your browser. Your data never leaves your device.
How to Use
Enter Your Text
Type or paste the text you want to encode or decode into the input editor on the left.
Select Mode and Options
Choose Encode or Decode mode, and select Standard or URL-Safe Base64 options.
Encode or Decode
Click Encode / Decode or enable auto-calculate for real-time Base64 conversion.
Copy the Result
Click Copy to copy the encoded or decoded result to your clipboard.
Frequently Asked Questions
What is Base64 encoding?
Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It uses 64 characters (A-Z, a-z, 0-9, +, /) and = for padding. Each Base64 digit represents exactly 6 bits of data, making it ideal for transmitting binary data over text-based protocols.
What is URL-safe Base64?
URL-safe Base64 replaces the + and / characters with - and _ respectively, making the encoded string safe for use in URLs and filenames. This variant is defined in RFC 4648 and is commonly used in web applications and API tokens.
When should I use Base64 encoding?
Base64 is commonly used for embedding images in HTML/CSS (data URIs), encoding email attachments (MIME), storing binary data in JSON/XML, generating API tokens, and transmitting binary data over text-based protocols like HTTP or SMTP.
Does Base64 encryption provide security?
No, Base64 is not encryption. It is an encoding scheme designed for data representation, not security. Anyone can decode Base64-encoded data. If you need to protect sensitive data, use proper encryption algorithms like AES or RSA instead.
How much larger is Base64-encoded data?
Base64-encoded data is approximately 33% larger than the original binary data. This is because every 3 bytes of binary data are encoded as 4 Base64 characters. The overhead comes from using only 6 bits per character instead of 8.
Is this Base64 tool free?
Yes, it is completely free to use with no registration, sign-up, or limits. You can use it as many times as you need for personal, educational, or commercial projects.