Ship your packages where they need to go with ease

Window Book has partnered with EasyPost to create a robust, easy-to-use, flexible shipping solution for companies of all sizes. For over 30 years, Window Book has been improving the operational efficiency of North America's mailers and shippers. Today, over 50% of USPS mail is processed by Window Book clients!

Window Book logo

Date Founded



Cambridge, MA

Shipping company type

Ecommerce Tools

Number of customers



Window Book helps people in business be more profitable by mailing and shipping more intelligently. Window Book has enabled over 9,997 companies to produce over $39.5 billion dollars in postage statements and hundreds of millions of dollars in increased profits by using our software since 1988.

Enterprise Shipper™

Enterprise Shipper™ is Window Book's easy-to-use and economical package shipping system. It combines the best of traditional client/server and web-based architecture to provide local storage of your shipping data. They have an exceptional real-time integration with on-premise order management or ERP systems. With a responsive and intuitive user interface, fast label-generation, high-performance scale interface, cloud-based delivery tracking and notification, and real-time address-standardization, individuals can save 15% off Commercial postage rates.

Multi-carrier shipping system

Rate-shopping for manual or automatic carrier selection across all carriers including USPS, UPS, FedEx, DHL

Faster, cost-effective shipping

A great solution for those shipping 10 packages per day or 10,000! WindowBook allows individuals to process individual parcels up to large batches. They provide address lookup in real-time, and their advanced automation reduces the amount of labor needed.

Additional EasyPost partners

Acumatica logo
WeSupply logo
inFlow Inventory Logo logo
XPSship logo
Insight Works logo
Loop logo
ReturnLogic logo
PrattBox logo
SKULabs logo
SmartShyp logo
Linnworks logo
Bandzoogle logo
And More

Small business shipping rates

Through EasyPost, small businesses access USPS Commercial Pricing and UPS marketplace rates for domestic and international shipments. Spend less on shipping with trusted carriers using our Create Label interface.

Flexible Shipping APIs for any online merchant

EasyPost's best-in-class Shipping APIs provide end-to-end flexibility and more control over parcel shipping and logistics processes for:

  • Ecommerce retailers
  • Fulfillment centers
  • Marketplaces
  • Enterprises
  • And more!

Save time with simple shipping

Save up to 88% on retail rates using our modern Shipping API, Tracking API, and Address Verification API for USPS, FedEx, UPS, DHL, and many more.