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Better data. Better campaigns. Better ROI.
Postcoder helps marketing agencies and in-house teams capture accurate customer contact data – so your campaigns reach real people at real addresses, every time.
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Your marketing ROI is only as good as your data
Email delivers an average return of £42 for every £1 spent in the UK – but that figure assumes your emails actually reach real people. When contact data is inaccurate, every campaign underperforms. Hard bounces damage your sender reputation, reducing inbox placement for everyone on your list. Invalid mobile numbers mean SMS campaigns fire into the void. And direct mail sent to wrong or outdated addresses is simply wasted spend.
Most marketing teams measure opens, clicks and conversions but rarely audit how much of their audience was unreachable to begin with.
£42:1is the average ROI of email marketing in the UK but B2B email delivery rates fell by 4% in 2023 as contact data decayed. Every bounce and bad address is money left on the table.DMA Email Benchmarking Report 2024
What Postcoder does for marketing teams
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 marketing
The tools to keep your data clean, your campaigns effective and your clients happy:
Address lookup
Accurate address capture via postcode lookup or autocomplete for 249 countries. Supports online forms, landing pages and CRM integrations.
Email validation
Real-time email verification to protect deliverability, reduce bounce rates and keep your marketing database clean.
Mobile validation
Verify mobile numbers are genuine and live before they enter your SMS or telemarketing workflows.
Rooftop geocoding
Precise lat/long coordinates for location-based segmentation, targeted local campaigns and catchment area analysis.
OTP verification
Add a layer of consent and identity verification at the point of data capture for high-value lead generation campaigns.
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
"It ensures that the addresses our customers enter are correct and standardised. This has drastically cut down on errors and improved our customer satisfaction."
Niamh K. Head of Marketing and Digital Transformation / G2 review
"Postcoder is simple, reliable and cost effective. It just works."
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.
