Printed postcards are one of the most cost-effective and versatile direct mail formats you can send. They’re perfect for promoting offers, announcing events, thanking customers, or driving online traffic with QR codes and discount codes.
At LettrLabs, we print and mail four postcard sizes — each with its own design template and specifications:
- 4" x 6" Printed Postcard – Compact, budget-friendly, ideal for high-volume campaigns.
- 6" x 9" Printed Postcard – More space for visuals and offers without higher postage rates.
- 6" x 11" Printed Postcard – Maximum USPS-approved size for flat-rate postage; high visibility in mailboxes.
- 11" x 18" Trifold Printed Postcard – Brochure-style format with three panels for storytelling.
Why Printed Postcards Work
- Instant visibility – No envelope to open; your message is seen immediately.
- Cost-efficient – Great reach for a lower cost per impression than many digital channels.
- Highly targeted – Personalization, segmented lists, and automation make them relevant.
- Multi-purpose – Works for promotions, announcements, thank-yous, reminders, and fundraising.
Universal Design Guidelines
These best practices apply to all postcard sizes we print:
1. Bleed, Trim, and Safe Zones
To avoid white borders or cut-off content, always extend your background colors/images beyond the trim edge (bleed) and keep important text/logos inside the safe zone.
Exact dimensions for each size are listed in their individual guides.
2. Address Block Rules
Every postcard must have a clear area for USPS-required addressing and postage.
This section is built into our templates and must remain free of design elements.
3. Image Resolution & File Setup
- Minimum resolution: 300 DPI for crisp printing.
- File types: PDF, PNG, or JPEG under 10MB.
- Our built-in DPI calculator checks your design in real time before printing.
4. Branding & Readability
- Use high-contrast colors for text and calls-to-action.
- Keep messaging simple and scannable — most readers glance for 3–5 seconds.
- Place your CTA prominently (front or back) so it’s not missed.
Choosing the Right Postcard Size
Download Postcard Templates
Each size has a ready-to-use Canva template with pre-set bleed, trim, safe zones, and address block placement — so you can design with confidence.
- 👉 4" x 6" Printed Postcard Template
- 👉 6" x 9" Printed Postcard Template
- 👉 6" x 11" Printed Postcard Template
- 👉 11" x 18" Trifold Postcard Template
Need Help?
If you have questions about setting up your design, understanding postal requirements, or preparing files for print, contact our team — we’ll make sure your postcards meet both USPS guidelines and your campaign goals.
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