Free Base64 Encoder & Decoder
Encode text to Base64, decode Base64 strings, or convert files to data URLs. Perfect for developers and data integration tasks.
About Base64
- • Base64 encoding converts binary data to ASCII text
- • Commonly used in data URLs, email attachments, and APIs
- • File-to-Base64 creates data URLs for embedding in HTML/CSS
- • All processing happens in your browser - no server uploads
What is Base64 Encoding?
Base64 is an encoding scheme that converts binary data into an ASCII text format. It's commonly used to encode data for transmission over media designed to handle text, such as email, JSON, XML, and data URLs in HTML/CSS.
Features
- Text to Base64: Encode any text string to Base64 format
- Base64 to Text: Decode Base64 strings back to readable text
- File to Base64: Convert files to Base64 data URLs for embedding
- Copy to Clipboard: Quickly copy results with one click
- Unicode Support: Handles special characters and emojis correctly
- Instant Processing: All encoding happens in your browser
How to Use Base64 Tool
Encode Text to Base64
- Select "Encode Text" mode
- Enter or paste your text in the input area
- Click "Encode" button
- Copy the Base64 result
Decode Base64 to Text
- Select "Decode Base64" mode
- Enter or paste Base64 string
- Click "Decode" button
- View and copy the decoded text
Convert File to Base64
- Select "File to Base64" mode
- Choose a file from your computer
- Get the complete data URL with Base64 encoding
- Use the data URL in HTML, CSS, or JavaScript
Common Use Cases
Web Development
Embed small images directly in HTML or CSS using data URLs. This eliminates extra HTTP requests and can improve page load performance for small assets like icons.
API Integration
Many APIs require Base64 encoding for binary data transmission, especially when working with JSON. Base64 ensures binary data can be safely transmitted in text-based formats.
Email Attachments
MIME email protocols use Base64 to encode binary attachments. This allows images, documents, and other files to be included in email messages.
Authentication
Basic authentication headers often use Base64 encoding for credentials. OAuth tokens and JWT (JSON Web Tokens) also utilize Base64.
Frequently Asked Questions
Is Base64 encryption?
No, Base64 is an encoding method, not encryption. It's designed for data transformation, not security. Base64 encoded data can be easily decoded by anyone. Never use Base64 alone to protect sensitive information.
Why does Base64 increase file size?
Base64 encoding increases data size by approximately 33%. This is because it represents 6 bits of data using 8 bits (one ASCII character). The trade-off is compatibility with text-based systems.
Can I encode Unicode and emojis?
Yes! Our tool properly handles Unicode characters including emojis. The text is first encoded to UTF-8 before Base64 conversion, ensuring all characters are preserved.
What are data URLs?
Data URLs are URLs that include the actual data inline rather than referencing an external file. The format is data:[MIME-type];base64,[Base64-data]. They're useful for embedding images in HTML/CSS.
Is my data safe?
Yes! All encoding and decoding happens entirely in your browser using JavaScript. No data is uploaded to any server. Your files and text never leave your computer.