Base64 Encoder/Decoder
Base64 encoding converts binary data to ASCII text using 64 characters (A-Z, a-z, 0-9, +, /). It increases size by ~33%. Used for embedding images in HTML, email attachments, and data URLs. Padding uses = character.
Encode text to Base64 or decode Base64 to text. Supports URL-safe encoding and Unicode characters. Free online Base64 converter.
Text to Encode
How to Use
- 1
Choose encode or decode
Select Encode to convert text/data to Base64, or Decode to convert Base64 back to original text
- 2
Enter your input
Type or paste the text you want to encode, or paste a Base64 string to decode
- 3
View the result
See the encoded or decoded output displayed instantly in real-time
- 4
Copy result
Click the copy button to copy the Base64 string or decoded text to your clipboard
Frequently Asked Questions
- What is Base64 encoding?
- Base64 is a binary-to-text encoding scheme that converts binary data into ASCII characters using 64 characters (A-Z, a-z, 0-9, +, /). It increases data size by ~33% but allows binary data to be safely transmitted through text-only channels like email or JSON.
- Why use Base64 encoding?
- Base64 is used to: embed images in HTML/CSS (data URLs), transmit binary data in JSON/XML, encode email attachments (MIME), store binary data in text-only databases, and pass data through URLs. It ensures binary data survives text-based transmission without corruption.
- Is Base64 encoding secure?
- No, Base64 is encoding, not encryption. Anyone can decode Base64 data—it provides no security. It is merely a format conversion. Never use Base64 to "hide" sensitive data. For security, use proper encryption (AES, RSA) and then optionally Base64 encode the encrypted output.
- What is the difference between Base64 and Base64URL?
- Standard Base64 uses '+' and '/' characters, which have special meanings in URLs. Base64URL replaces these with '-' and '_' to be URL-safe without escaping. It also typically omits padding '=' characters. Use Base64URL for data in URLs, filenames, or query parameters.
- How much does Base64 increase file size?
- Base64 increases data size by approximately 33% (4 characters for every 3 bytes of input). This is because 3 bytes (24 bits) are encoded as 4 Base64 characters (6 bits each). A 1 MB file becomes ~1.33 MB when Base64 encoded.