Sendcloud

Sendcloud is a shipping automation platform from a Dutch company based in Eindhoven and one of the most widely used shipping tools in Europe. It is built for online stores that want to handle parcel shipping professionally — from their first orders to hundreds of parcels a day — without signing a separate contract and negotiating rates with every carrier.

It works simply: you connect your store, orders start syncing automatically, and for each one you just pick a carrier and print the label — one by one or in bulk. You can ship right away using Sendcloud's pre-negotiated rates, so you don't need contracts of your own; and if you already have some, you simply upload them to your account and keep using them.