Free Online Base64 Encoder & Decoder Tool
Encode and decode Base64 strings instantly with our free online tool. Secure, fast, and works entirely in your browser.
100% Private & Secure✓ Offline Ready
Your data is processed locally in your browser and is never uploaded to any server.
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What is Base64?
What is Base64?
Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It is commonly used when there is a need to encode binary data that needs to be stored and transferred over media that are designed to deal with textual data.
- Encoding: Converts data to Base64 format
- Decoding: Converts Base64 back to original data
- Safety: Not encryption, just encoding
- Use Case: Data transmission and storage
- Privacy: 100% client-side processing, no data uploaded to server
Common Uses
- Data URIs: Embedding images directly in HTML/CSS
- Email: Sending attachments via MIME
- Web Storage: Storing complex data in cookies or URLs
- APIs: Transmitting binary data in JSON
- Authentication: Basic HTTP authentication headers
- Obfuscation: Simple data hiding (not secure encryption)
How to Use
- Select Encode or Decode mode
- Paste or type your text in the input field
- For short text (under 1000 chars), see instant results
- For longer text, click the process button
- Use the Swap button to quickly reverse the operation
- Click the copy icon to copy the result to your clipboard
Glossary
- Base64 Encoding
- A method of converting binary data into ASCII text format using 64 characters (A-Z, a-z, 0-9, +, /).
- ASCII
- American Standard Code for Information Interchange - a character encoding standard for electronic communication.
- Binary Data
- Data in the form of 0s and 1s that computers use to store and process information.
- MIME
- Multipurpose Internet Mail Extensions - a standard for formatting files to be sent over the internet.
- Data URI
- A URI scheme that allows embedding small files inline in web documents.
- Padding
- Equal signs (=) added to the end of Base64 encoded strings to ensure proper length.
What is Base64?
What is Base64?
Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It is commonly used when there is a need to encode binary data that needs to be stored and transferred over media that are designed to deal with textual data.
- Encoding: Converts data to Base64 format
- Decoding: Converts Base64 back to original data
- Safety: Not encryption, just encoding
- Use Case: Data transmission and storage
- Privacy: 100% client-side processing, no data uploaded to server
Common Uses
- Data URIs: Embedding images directly in HTML/CSS
- Email: Sending attachments via MIME
- Web Storage: Storing complex data in cookies or URLs
- APIs: Transmitting binary data in JSON
- Authentication: Basic HTTP authentication headers
- Obfuscation: Simple data hiding (not secure encryption)
How to Use
- Select Encode or Decode mode
- Paste or type your text in the input field
- For short text (under 1000 chars), see instant results
- For longer text, click the process button
- Use the Swap button to quickly reverse the operation
- Click the copy icon to copy the result to your clipboard
Glossary
- Base64 Encoding
- A method of converting binary data into ASCII text format using 64 characters (A-Z, a-z, 0-9, +, /).
- ASCII
- American Standard Code for Information Interchange - a character encoding standard for electronic communication.
- Binary Data
- Data in the form of 0s and 1s that computers use to store and process information.
- MIME
- Multipurpose Internet Mail Extensions - a standard for formatting files to be sent over the internet.
- Data URI
- A URI scheme that allows embedding small files inline in web documents.
- Padding
- Equal signs (=) added to the end of Base64 encoded strings to ensure proper length.