Converters · FREE ONLINE TOOL
Base64 Encoder & Decoder
Encode text to Base64 or decode Base64 to text instantly. Supports UTF-8, handles special characters. Free online tool, no registration.
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How to use Base64 Encoder & Decoder
- Select "Encode" or "Decode" mode using the toggle
- Paste your text (for encoding) or Base64 string (for decoding) into the input field
- The result appears automatically in real-time
- Click "Copy" to copy the result to your clipboard
- Use "Clear" to reset and start over
- For files, first read the file content, then encode
Examples & practical tips
- Text "Hello World" → Encoded: SGVsbG8gV29ybGQ=
- UTF-8 "Café ☕" → Encoded: Q2Fmw6kg4piV (preserves special characters)
- Basic Auth "user:pass" → dXNlcjpwYXNz (for Authorization headers)
- JSON payload → Encoded for safe URL transmission
About Base64 Encoder & Decoder
Convert between text and Base64 encoding effortlessly with our free online Base64 Encoder/Decoder. Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format, making it essential for data transmission across systems that only support text.
What is Base64 Encoding? Base64 converts binary data into a set of 64 printable ASCII characters (A-Z, a-z, 0-9, +, /). This encoding is widely used in email attachments (MIME), embedding images in HTML/CSS (Data URLs), JWT tokens, API authentication, and storing binary data in JSON or XML.
Common Base64 Use Cases: - Email Attachments: MIME encoding for binary files - Data URLs: Embedding images directly in HTML/CSS - API Authentication: Basic Auth headers (username:password encoded) - JWT Tokens: JSON Web Tokens use Base64URL encoding - Configuration Files: Storing binary data in text-based configs - Cookies: Encoding complex data for cookie storage
Tool Features: - Instant Encoding: Convert any text to Base64 in real-time - Reliable Decoding: Decode Base64 back to original text - UTF-8 Support: Properly handles Unicode characters, emojis, and special symbols - Error Detection: Identifies invalid Base64 strings - One-Click Copy: Copy encoded/decoded result instantly
Base64 increases data size by approximately 33% (3 bytes become 4 characters), so it's not a compression method. It's purely for ensuring safe data transmission across text-only channels. All processing occurs in your browser, ensuring privacy for sensitive data like authentication tokens.
When this comes in handy
- Encoding credentials for HTTP Basic Authentication
- Creating Data URLs for inline images in HTML/CSS
- Encoding binary data for JSON API payloads
- Decoding JWT token payloads for debugging
- Storing binary configuration in environment variables
- Encoding email attachments (MIME format)
Frequently asked questions
Is Base64 encoding the same as encryption?
No! Base64 is an encoding scheme, not encryption. Anyone can decode Base64 without any key or password. Never use Base64 alone for securing sensitive data. For security, use proper encryption algorithms like AES.
Why does my Base64 string end with = or ==?
The equals signs (=) are padding characters. Base64 works on groups of 3 bytes, and padding ensures the output length is a multiple of 4 characters. One = means 1 byte of padding, == means 2 bytes.
Can I encode images with this tool?
This tool is designed for text encoding. For images, you would need to first get the binary content of the image, then encode it. Many browsers support this with FileReader API. The result can be used as a Data URL.
What's the difference between Base64 and Base64URL?
Base64URL replaces + with - and / with _ to make the output URL-safe. Standard Base64 uses characters that have special meaning in URLs. JWT tokens use Base64URL encoding for this reason.
Why is my decoded text showing weird characters?
This usually happens when the original text was encoded with a different character set. Our tool uses UTF-8. If the source used a different encoding (like ISO-8859-1), the decoded text may appear garbled.
A little more know-how
Base64 Encoding Explained: When to Use It (and When to Avoid It) for Web Speed
Is Base64 making your website slower? Discover the pros and cons of Base64 encoding for images and data, and learn how to use encoders safely for modern web development.
Read guideThe Developer's Guide to Encoding: Base64, URL Encoding, and Unicode Explained
Why does 'hello world' become 'hello%20world' in a URL? What is Base64 actually for? A practical guide to encoding for web developers.
Read guideHow to Format JSON Online Quickly and Securely
Learn how to format JSON online quickly and securely using tools that protect your sensitive API data while instantly turning messy strings into readable code.
Read guideKEEP THINGS MOVING
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