Sellers switch couriers for all kinds of reasons — pricing, reliability, coverage — and the good news is that because UK courier label formats are so standardised, switching rarely means replacing hardware. It does mean a bit of careful workflow planning to avoid a rocky transition.
Why sellers switch
Common triggers are pricing changes, service reliability issues, or simply consolidating from multiple couriers down to one for account-management simplicity. Whatever the reason, the physical label side of the transition is usually the easiest part — see our courier comparison guide for how similar Royal Mail, DPD and Evri actually are on label format.
Label format differences to check first
While the core 100 × 150mm size is universal, it's worth double-checking your new courier's specific label template against your printer setup before a full switch — particularly around returns label formatting, covered for Royal Mail specifically in our returns labels guide.
Running a parallel trial
Rather than switching every order overnight, running a subset of orders through the new courier for a week or two — while the bulk of volume stays on your existing setup — lets you catch printing or workflow issues on a small scale before they affect your whole operation. This is standard practice for larger operations and worth adopting even at small scale.
Retraining the packing team
Even though the label itself looks similar, courier-specific quirks (different QR code placement, different manifest or handover procedures at drop-off) mean a packing team used to one courier's process benefits from a short walkthrough of the new one, rather than assuming it's a drop-in replacement.
Keeping label stock compatible
Because label size and core dimensions are standard across couriers (see our 4×6 guide and core size guide), your existing label stock and printer generally carry over unchanged through a courier switch — one less thing to worry about during an already busy transition period.
Your stock stays compatible either way
Standard 100 × 150mm direct thermal labels work across every major UK courier, so switching never means switching labels.
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