Documentation

Find the right guide for creating postcards or integrating Card4U with your tools.

Create and print

How it works

Follow the steps from design to delivery.

Print specifications

Prepare artwork with the correct size, resolution, and bleed.

B2B campaign guide

Plan and create targeted postcard campaigns.

Integrations

MCP for AI assistants

Connect an assistant, create a draft, review it, and send after confirmation.

REST API

Find API token management and the direct sending reference in your profile.

Link generator

Build a link that opens the postcard creator with your content.