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Create a unified view of every customer
Standardise, validate and enrich customer data across all your systems.
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Fragmented customer data creates problems that are hard to identify, and harder to solve
The value of a unified customer view depends entirely on how much you can trust the records behind it. Accurate, consistent data means reliable reporting, effective communications, and operational processes that run without constant intervention.
Inaccurate data means the opposite. Ever captured an email address at checkout but it doesn't match the one already in the CRM? What about a postal address entered slightly differently across two systems? Or the mobile number that was never validated and quietly stopped working…
In isolation, none of these issues feels critical, but together they mean you're making decisions about marketing, delivery, compliance and risk based on customer records you can't fully trust.
Where fragmented data causes the most damage:
Duplicate customer records created because the same person appears with slightly different details across systems
Marketing campaigns that underperform because a portion of your contact list is out of date or invalid
Compliance and audit processes that are harder than they need to be when address data isn't standardised
Operational errors that trace back to a detail such as a wrong postcode that should have been caught earlier
How can Postcoder help?
Postcoder validates and standardises customer contact details at the point they're captured before they reach your database or CRM.
Address lookup returns data in a consistent, structured format every time: the same fields, the same layout, regardless of how a customer types their query. Email and mobile validation confirm that contact details are real and reachable. Because all of this happens through a single API, you're not managing multiple integrations or reconciling data from different sources. Everything comes back in one place, in one format.
The result is a customer database that's cleaner, more consistent, and easier to work with across every team that depends on it.
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.
Your data quality toolkit
Address lookup
Return validated, structured address data in a consistent format every time. Reduce the variation in how addresses are stored across systems, making deduplication and record-matching significantly easier.
Learn more about address lookupEmail validation
Confirm that email addresses are valid and deliverable at the point of entry. Keeps your contact list clean and your communications reliable.
Learn more about email validationMobile validation
Check that mobile numbers are real, correctly formatted and active on a network before they are saved to your records.
Learn more about mobile validationUPRN data
Include a Unique Property Reference Number with every lookup, a persistent identifier that stays with a property regardless of how its address is written. Useful for linking customer records across systems where the address format might vary.
Learn more about UPRN data
What our customers say
"Postcoder is a great tool we've integrated directly into our applications for checking addresses, emails, mobile numbers, and bank details. It's really reliable and easy to use, fitting perfectly into our systems without any hassle."
Verified user Computer Software / G2 review
"Postcoder supports both our internal and external user experience by enabling fast and accurate address entry. This speeds up data input and ensures consistent, verified data, which is essential for reliable reporting and operational accuracy."
T.W. Senior Product Manager / G2 review
"The additional features help create a more detailed profile of customers and verify key details, improving data accuracy and customer insights. The service is fast, efficient, and integrates seamlessly into our systems."
Verified user / G2 review
"Capturing high quality data from our customers and making it easy for them to provide their contact details, is important to us. We needed to find a solution that both the business and the customer could trust."
Carl Horn Head of Digital Servicing and Customer Transformation / Capquest
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.
