> maximum | efficiency | compression <
// Base91 encoding with 91 ASCII characters for maximum space efficiency
Highest Efficiency
Base91 provides the best compression ratio among common base encodings.
All Printable
Uses 91 printable ASCII characters for maximum compatibility.
Space Saving
Achieves ~23% overhead compared to 33% for Base64, saving significant space.
>> technical info
How Base91 Works:
Base91 uses 91 of the 94 printable ASCII characters (excluding quotes and backslash). It achieves exceptional efficiency by packing 13-14 bits into every two output characters.
Example:
"Hello" → fPNKd
Why Use Base91:
- >Best compression efficiency
- >23% overhead vs 33% for Base64
- >All printable ASCII characters
- >Ideal for bandwidth-limited scenarios
- >Maximum data density
>> frequently asked questions
What is Base91 encoding?
Base91 is a binary-to-text encoding that uses 91 printable ASCII characters to achieve the highest compression efficiency among common base encodings.
When should I use Base91?
Base91 is ideal when you need maximum space efficiency and can work with all printable ASCII characters. It's perfect for bandwidth-limited applications or when storage space is critical.
How efficient is Base91 compared to Base64?
Base91 has only ~23% overhead compared to Base64's 33% overhead. This means Base91 produces significantly smaller encoded output for the same input data.
Is Base91 widely supported?
While not as common as Base64, Base91 has implementations in many programming languages and is used in applications where maximum compression efficiency is needed.