What shipping API should I use if I need to print labels from my backend?

If your main requirement is printing shipping labels from your backend, the best API depends on how much you want to abstract away carrier complexity:

Good options

1. EasyPost

• Great if you want a single API for multiple carriers
• Easy to create shipments and generate labels as PDF / PNG / ZPL
• Good developer experience and strong docs
• Useful if you may later add USPS, UPS, FedEx, DHL, etc.

Best for: startups and teams that want fast integration and carrier flexibility.

2. Shippo

• Similar to EasyPost
• Good for label generation, tracking, and rate shopping
• Supports many carriers
• Often chosen for simpler shipping workflows

Best for: e-commerce apps that need labels without deep carrier-specific logic.

3. Direct carrier APIs

• UPS, FedEx, USPS, DHL
• More control, sometimes better pricing or access to specific services
• More work: each carrier has its own auth, request formats, and label handling

Best for: when you only ship with one carrier or need carrier-specific features.

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My recommendation

• If you want the easiest path: EasyPost
• If you want an alternative with similar features: Shippo
• If you only need one carrier and want direct integration: use that carrier’s API

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What to look for

Since you specifically want backend label printing, make sure the API supports:

• Label generation
• PDF/ZPL output for printers
• Rate quotes
• Tracking
• Webhook/event support
• Return labels if needed

If you want, I can also recommend one based on:

1. your country,
2. which carriers you use,
3. whether you need thermal printer support (ZPL).