Ready to make every pound of fundraising go further?
Join over 10,000 organisations using Postcoder to capture better supporter data and build stronger relationships. Start your free 30-day trial today – no credit card required.
Every penny counts. Don't waste it on bad data.
Postcoder helps charities and not-for-profit organisations capture accurate supporter data - reducing wasted donor communications, maximising fundraising ROI and building the trusted relationships that keep supporters giving.
The hero includes a visual product demo...
Dirty data wastes fundraising budgets and damages donor relationships
For charities, every pound of fundraising expenditure needs to work as hard as possible. When supporter data is inaccurate – wrong addresses, invalid emails, outdated mobile numbers – direct mail goes undelivered, email campaigns bounce and Gift Aid submissions fail. The financial cost is real, but so is the reputational risk: mailing deceased supporters, or sending communications to people who have moved away, can cause genuine harm to the relationships charities depend on.
The fix is straightforward. Capturing and validating supporter data accurately at the point of entry is one of the most cost-effective investments a charity can make.
95%of direct mail is engaged with, with fantastic potential for ROI. Don't let dirty data sabotage your opportunity to reach supporters.Marketreach
What Postcoder does for charities
What is Postcoder?
Postcoder is a multi-feature API you can integrate into your website or app quickly and easily using pre-built integrations, sample code and API reference, all within clear and well-structured docs. You can be up and running in minutes with a free trial, and Postcoder's support specialists are always on hand if you need help.
The ultimate toolkit for charities
The tools to protect your fundraising budget and strengthen every supporter relationship:
Address lookup
Verified address capture via postcode lookup or autocomplete. Sourced from authoritative Royal Mail data.
Email validation
Confirm supporter email addresses are real and deliverable before sending fundraising appeals or campaign updates.
Mobile validation
Verify mobile numbers are genuine and live – essential for SMS campaigns, donation acknowledgements and event reminders.
OTP verification
Secure supporter account registration with SMS one-time password verification.
Bank validation
For charities collecting direct debit donations, validate bank account details in real time to reduce failed payments and administration.
What our customers say
"Postcoder has been great; there has been a noticeable quality increase in our campaigns. In some the pickup rate went from 30% to 60–70% and our appointment ratings for a campaign went from a 15% average to 40% for one client!"
Daniel Jones IT Technician / Lead Pronto
"Efficiency at its finest. Very easy to use and easy implement via integration and the response time when using the tool in real world applications is quick, effective and accurate."
Craig F. Employment Vetting Manager / G2 review
"A simple and effective user interface combined with some good prices and excellent customer service. Would highly recommend."
Dan B. Verified User / G2 review
Award-winning API with top performance, easy admin and great support
Businesses rate Postcoder 4.7 stars out of 5 on the world's most trusted software marketplace.
