Calculate Base64 string length and original file size. Understand encoding overhead and size implications.
Calculate from Base64 string or estimate from original file size
Base64 encoding converts binary data into ASCII text using 64 printable characters. This encoding increases the data size by approximately 33% (or 4/3 of the original size). The calculator helps you understand the size implications of Base64 encoding.
The formula is: Base64 Length = ceil((Original Bytes * 4) / 3). Padding characters (=) are added to make the length a multiple of 4. This tool calculates both directions: from Base64 to original size, and from original size to estimated Base64 length.
Estimate Base64 payload sizes for API request/response planning
Calculate storage requirements for Base64 encoded data
Understand bandwidth impact of Base64 encoding
Check if Base64 data fits within size constraints
Base64 encodes 3 bytes of binary data into 4 ASCII characters, resulting in a size increase of approximately 33%. This overhead is the trade-off for making binary data text-safe.
Calculations from Base64 strings are exact. Estimates from file sizes are accurate within the padding tolerance (0-2 characters), which is negligible for larger files.
Padding characters (=) are added to make the Base64 string length a multiple of 4. There can be 0, 1, or 2 padding characters depending on the original data length.
Absolutely! This Base64 length calculator is completely free with no limitations, registration, or hidden costs.