Software Venture Consulting

FileMaker Pro downloads & Resources
FileMaker Custom Functions
FileMaker Web Viewer Examples
FileMaker Pro & Lasso Consulting
FileMaker Books
FileMaker Articles
FileMaker Error Reference

Free Web Tools
Free FileMaker Tools

Personal Pages

Shopping Cart
Shopping Cart


Free Newsletter


Privacy Policy

FileMaker is a registered trademark of FileMaker, Inc. in the U.S. and other countries.


 FileMaker Pro Custom Functions

List  |  Show Random  |  Upload  |  Add This to Your Site

ChecksumAdler32 ( text ; seed1 ; seed2 )

Rate this function:  

  Average rating: 4.3  (39 votes)
  Discuss this Custom Function

Vaughan Bromfied, Vaughan Bromfield design

Creates a checksum of the input text bases on the Adler-32 algorithm.

Sample Input:
ChecksumAdler32 ( "wikipedia" ; 1 ; 0 )
Sample Output:

 Then copy & paste into FileMaker Advanced's Edit Custom Function window.

Click here to copy To Clip Manager if you have myFMbutler's Clip Manager installed


ChecksumAdler32 ( text ; seed1 ; seed2 )

The initial values for seed1 and seed2 must be 1 and 0 respectively.

Adler-32 is a checksum algorithm which was invented by Mark Adler.
This custom function was written by Vaughan Bromfield <>.

This function is based on the algorithm published on the Adler-32 page on Wikipedia (accessed 2010-02-17)

The published algorithm used ASCII encoding and returns a hexadecimal result; this cf implementation uses Unicode encoding and returns a decimal (base 10) result.

There may be other differences.

All care taken but no responsibility. Your mileage may vary.

Note: these functions are not guaranteed or supported by Please contact the individual developer with any questions or problems.

This is my Custom Function and I want to edit it


Could the people that rate the function poorly please add a comment to let me know what the disappointment is. Thanks - Vaughan.

Vaughan Bromfield, Sydney, Australia
November 11, 2010 8:35pm

Make a comment about this Custom Function (please try to keep it brief & to the point). Anyone can post:

Your Name:
characters left. If you paste in more than 1500 characters, it will be truncated. Discuss the function - advertisements and other useless posts will be deleted.
Answer 8 + 8 =
Search for Custom Functions:

Custom Functions Widget
Download the Custom Function Dashboard Widget for OS X
Keep all the latest Custom Functions right at your fingertips!

Newest Custom Functions:

1. PreviousMonthEndDate ( myDate )
  (Wed, Mar 07, 3:35am)
2. PreviousMonthName (myDate)
  (Wed, Mar 07, 3:33am)
3. FmTableFields ( tableName ; fieldsInclude ; fieldsExclude ; classExclude ; typeExclude ; prefixExclude )
  (Fri, Mar 02, 6:32am)
4. sql.getTable ( fullyQualifiedFieldObject )
  (Thu, Feb 22, 8:36am)
5. sql.getField ( fullyQualifiedFieldObject )
  (Thu, Feb 22, 8:34am)
6. FilterOut ( ListA ; ListB )
  (Wed, Feb 21, 6:11pm)
7. Char0 ( )
  (Sun, Feb 18, 2:35am)
8. CreateVCardFile ( FirstName ; LastName ; CompanyName ; Phone ; Email ; WEB ; hAddress1 ; hAddress2 ; hZip ; hCity ; hCountry ; wAddress1 ; wAddress2 ; wZip ; wCity%2
  (Sun, Feb 18, 1:50am)

RSS Feed of Custom Functions