> 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/bi-fold-self-mailers.md).

# Bi-Fold Self-Mailers

**Bi-Fold Self-Mailers give you more space than a postcard while eliminating the need for an envelope.** They’re perfect when you want to **convey more information** without sacrificing simplicity or adding mailing costs for envelopes.

These mailers are **folded in half**, sealed at the edges, and mailed as a **self-contained unit**.

### Bi-Fold Self-Mailer Specs

| **Feature**       | **Details**                                        |
| ----------------- | -------------------------------------------------- |
| **Flat Size**     | 6" x 18" (folded to 6" x 9")                       |
| **Paper Type**    | Premium Cardstock (similar to postcards, 16pt C1S) |
| **Sealing**       | Glue tabbed (edge-sealed for mailing)              |
| **Postage Class** | First-Class Mail (1-5 business days)               |

<figure><img src="/files/PzE1oFOWIunx4Bic8KLF" alt="" width="563"><figcaption></figcaption></figure>

<figure><img src="/files/JFTpBTBZcAv8iD2VPvXU" alt="" width="563"><figcaption></figcaption></figure>

### Why Bi-Fold Self-Mailers Work

* **More space for storytelling:**\
  Two panels allow for **expanded content**, great for **offers, event details, or product catalogs**.
* **No envelope needed:**\
  Savings on **material and postage** while ensuring your message **stays secure**.
* **Visually striking:**\
  The larger format (6x9 folded) stands out compared to standard letters and postcards.

### Best Use Cases for Bi-Fold Self-Mailers

| **Use Case**                        | **Why Bi-Folds Work**                                                         |
| ----------------------------------- | ----------------------------------------------------------------------------- |
| **E-commerce New Product Launches** | Highlight **multiple products or offers** with vibrant visuals.               |
| **Real Estate Market Updates**      | Share **neighborhood stats, recent sales, and market insights**.              |
| **Event Invitations**               | Provide **event details, maps, and RSVP instructions**.                       |
| **Educational Campaigns**           | Perfect for **non-profits or service providers** needing to explain programs. |

### Design Guidelines for Bi-Fold Self-Mailers

| **Element**        | **Spec**                                                            |
| ------------------ | ------------------------------------------------------------------- |
| **Resolution**     | 300 DPI for all images and graphics                                 |
| **Bleed**          | 0.125” around edges                                                 |
| **Safe Zone**      | 0.25” inside the edges                                              |
| **Folds & Panels** | Design with **front cover, inside panels, and back cover** in mind  |
| **File Format**    | PDF                                                                 |
| **Fonts**          | Sans-serif for readability (Open Sans, Lato); minimum **10pt** size |

### First-Class Mail Only

Bi-Fold Self-Mailers are shipped via **First-Class Mail** for faster delivery:

* **Estimated Delivery:** 1-5 business days
* **Includes address forwarding & return** if undeliverable

### Common Mistakes to Avoid

* **Ignoring the fold layout:**\
  Ensure that critical design elements (e.g., **headlines, CTAs**) don’t get lost in the fold lines.
* **Overcrowding the panels:**\
  Use the space wisely—keep **one core message per panel** to maintain flow and readability.
* **Skipping address placement:**\
  Make sure your **mailing address block** is positioned correctly on the **back cover panel**.