What is Base64 Encoding?
Base64 is a binary-to-text encoding scheme that converts binary data into a sequence of 64 printable ASCII characters (A-Z, a-z, 0-9, +, /). It is widely used in web development, APIs, and email systems to safely transmit binary data over text-based protocols.
Encode text, Unicode, and Nepali characters to Base64
Decode Base64 strings back to original text
Upload and encode files up to 5MB
Real-time size statistics and overhead calculation
Swap input/output for quick re-encoding
Common Use Cases:
- Embed images in HTML/CSS using data URLs
- Encode API authentication tokens (HTTP Basic Auth)
- Convert binary files for JSON API payloads
- Debug Base64-encoded email attachments (MIME)
- Store binary data in text-based config files
- Encode credentials for webhook headers
Note: Base64 encoding increases data size by approximately 33%. It is not encryption and should not be used for security purposes.
Frequently Asked Questions
What is Base64 encoding?
Base64 is a binary-to-text encoding scheme that converts binary data into a sequence of ASCII characters. It uses 64 characters (A-Z, a-z, 0-9, +, /) to represent data, making it safe to transmit over text-based protocols like email (MIME) and HTTP.
Why does Base64 increase file size?
Base64 encoding represents every 3 bytes of binary data as 4 ASCII characters, resulting in approximately 33% size increase. This overhead is the trade-off for making binary data safe to transfer over text-only channels. The stats panel above shows the exact overhead for your data.
Is Base64 encoding the same as encryption?
No. Base64 is an encoding scheme, not encryption. Anyone can decode a Base64 string back to its original form without a key. It should never be used to protect sensitive data like passwords, API keys, or personal information.
What are common uses of Base64?
Base64 is commonly used for embedding images in HTML/CSS via data URLs, encoding email attachments (MIME), transmitting binary data in JSON APIs, HTTP Basic Authentication headers, and storing binary data in text-based databases or configuration files.