> For the complete documentation index, see [llms.txt](https://help.openletterconnect.com/olc-help-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/products-and-specs/postcards.md).

# Postcards

**Postcards are the go-to choice for high-volume, visually engaging direct mail campaigns.** They're cost-effective, quick to produce, and designed to **grab attention fast**.

Whether you’re announcing an event, promoting an offer, or staying top-of-mind with prospects, postcards deliver your message **without needing to be opened**.

### Sizes & Specifications

| **Size**      | **Dimensions** | **Postage Class**   | **Delivery Speed**             |
| ------------- | -------------- | ------------------- | ------------------------------ |
| **4x6 inch**  | 4" x 6"        | First-Class Mail    | 1-5 business days (estimated)  |
| **6x9 inch**  | 6" x 9"        | First-Class Mail    | 1-5 business days (estimated)  |
| **6x11 inch** | 6" x 11"       | Standard-Class Mail | 7-21 business days (estimated) |

> 📌 **Why the difference in postage class?**\
> USPS **First-Class** delivers faster, but the **6x11 size exceeds First-Class limits**, so it's shipped via **Standard-Class Mail**.

### Paper Type

* **16pt C1S Paper** (Coated One Side)
  * **Sturdy, premium cardstock**
  * **Smooth finish** with **glossy coating on one side** (perfect for high-quality images)
  * **Writable on the uncoated side**, great for personalized notes or QR codes.

### Best Use Cases for Each Size

| **Size**      | **Best For**                                                                                     |
| ------------- | ------------------------------------------------------------------------------------------------ |
| **4x6 inch**  | Budget-friendly campaigns, quick promotions, reminders, or high-volume outreach.                 |
| **6x9 inch**  | Stand-out messaging, detailed visuals, mid-sized campaigns (great for real estate investors).    |
| **6x11 inch** | Bold, large-format promotions where visibility is key (e.g., big sales events, seasonal promos). |

> 💡 **Pro Tip:**\
> The **larger the postcard**, the **more it stands out** in the mailbox—but costs increase accordingly.

### Design Guidelines

* **Resolution:** 300 DPI for images and graphics
* **Bleed:** Add **0.125” bleed** beyond the cut edge
* **Safe Zone:** Keep critical text/logos **0.25” inside** the edges
* **File Format:** PDF
* **Color Mode:** CMYK for print accuracy

<figure><img src="/files/EmsJBnVa1Awos4HAL6zy" alt="" width="485"><figcaption></figcaption></figure>

<figure><img src="/files/7AXxU95SdVC3XCA6WkWT" alt="" width="488"><figcaption></figcaption></figure>

### When to Use Postcards

* **Real Estate Investors:**\
  Send **6x9 postcards** to absentee owners with a bold headline: *“We’re looking to buy homes in your area!”*\
  Add a **QR code** linking to a lead capture form.
* **E-commerce Stores:**\
  Use **4x6 postcards** for **new customer promos** or **seasonal discounts**—drive traffic back to your online store.
* **Local Services:**\
  Announce **grand openings**, **special events**, or **limited-time offers** with **large 6x11 postcards** for maximum visibility.

### Common Mistakes to Avoid

* **Overcrowding the design:**\
  Use whitespace strategically. A cluttered postcard is harder to read and less effective.
* **Ignoring the call-to-action:**\
  Every postcard should have a **clear CTA**: *Call Now*, *Scan this QR Code*, or *Visit our Website*.
* **Skipping address verification:**\
  Ensure your mailing list is clean—OLC automatically validates addresses via **Accutrace** to reduce undeliverable mail.