Encoding Tool
Base64 Encoder / Decoder
Encode text to Base64 format or decode Base64 strings back to plain text. Perfect for data encoding, API testing, and secure data transmission.
Characters: 0
Words: 0
Pro Tips
Encode for safe data transmission
Decode to read encoded data
Use with JSON for API calls
Not a security encryption
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Frequently Asked Questions
Everything you need to know about Base64 encoding
What is Base64 encoding and why is it used?
Base64 is a binary-to-text encoding scheme that converts binary data into ASCII text using 64 characters (A-Z, a-z, 0-9, +, /). It's commonly used for transmitting binary data over text-based protocols like email attachments, embedding images in HTML/CSS, and encoding binary data in JSON APIs.
How do I encode a string to Base64?
Simply paste your text into our tool and click "Encode" or use the "Convert" button. Our tool will instantly convert your text to Base64 format. You can then copy or download the encoded result. In JavaScript, use btoa() function, or use our online tool for quick encoding.
How do I decode Base64 to plain text?
Switch to "Decode" mode in our tool, paste your Base64 string, and click "Convert". The tool will decode it back to plain text. In JavaScript, use atob() function. Our tool handles both UTF-8 and ASCII text, making it perfect for decoding API responses and email attachments.
Is Base64 encoding secure for sensitive data?
No, Base64 is NOT a security encryption method—it's an encoding scheme. It does not provide any security or confidentiality. Anyone can decode Base64 easily. It's used for data transmission compatibility, not for protecting sensitive information. Always use proper encryption for sensitive data.
What's the difference between Base64 and UTF-8 encoding?
UTF-8 is a character encoding that represents Unicode characters as bytes, used for storing and transmitting text. Base64 is a binary-to-text encoding that converts binary data into ASCII text. They serve different purposes: UTF-8 for text representation, Base64 for safe transmission of binary data over text-based protocols.
Why do I see Base64 in JSON API responses?
JSON is text-based and can't directly include binary data (like images or file content). Base64 encoding converts binary data into a text-safe format that can be included in JSON. It's commonly used for uploading images, file attachments, and transmitting encrypted data in API calls.
Does Base64 encoding increase file size?
Yes, Base64 encoding increases file size by approximately 33%. Every 3 bytes of original data become 4 bytes of Base64 data due to the encoding algorithm. While this overhead is acceptable for small data like images in HTML/JSON, it's not recommended for very large files due to increased bandwidth and storage requirements.
What characters are used in Base64 encoding?
Base64 uses 64 characters: uppercase A-Z (26), lowercase a-z (26), digits 0-9 (10), plus sign (+), and forward slash (/). The equals sign (=) is used for padding at the end. This character set ensures safe transmission over text-based protocols without requiring special handling.