Adler-32 Checksum Calculator
Enter text to compute its Adler-32 checksum.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
The Adler-32 checksum is a fast error-detection algorithm that processes text or binary data byte by byte, maintaining two running sums — A, the sum of all bytes plus one (mod 65521), and B, the running sum of A after each byte (mod 65521) — then combines them into a single 32-bit value as B×65536 + A. This calculator computes both running sums and the final checksum in hexadecimal and decimal form for any input text.
Adler-32 was designed as a faster, simpler alternative to CRC-32 and is best known as the checksum built into zlib, the compression library used by PNG, ZIP-family formats and countless other systems, where it's applied to compressed data blocks to catch transmission or storage corruption. Software developers and systems programmers use tools like this to verify their own Adler-32 implementation matches a known-good reference, or to manually check the checksum embedded in a zlib stream while debugging.
Was this helpful?
Popular calculators
Loan Calculator
Monthly payment, total interest and full amortization schedule.
Percentage Calculator
Percent change, percent of, and ratio calculations.
Discount Calculator
Calculate final price, savings, and discount amount.
BMI Calculator
Body mass index from height and weight (metric or imperial).
Age Calculator
Compute your exact age in years, months and days from a birth date.
Compound Interest Calculator
Calculate the final amount and interest earned with compounding.
All Calculators
No calculators found
Comments (0)