Welcome to OnlineCASS... lets fix some addresses!

About Us

Online CASS is a service of LetterStream; a printing, mailing and document solutions company. We built this tool for ourselves since we clean address lists on a daily basis.


We felt this tool was too useful not to share. Why not try it out now and see how easy and valuable our service is. It's fast and convenient, with no registration required!

Testimonials

We just picked up a new line of business and a new list of names and addresses.

Online CASS did a great job of perfecting addresses before we loaded them into our main database.
- Anthony Simons
Wow! So easy and so fast! I can't believe all I had to do was upload my file. Thanks, Online CASS, for all!!
- Laura Bengal
Using Online CASS has saved us hundreds of dollars in postage by allowing us to purge our database of undeliverable addresses. This is an incredibly useful tool, and amazingly fast!
- Elizabeth Martinez

ONLINE CASS © 2019 A LETTERSTREAM COMPANY. TERMS OF SERVICE