Informed Delivery Image Specifications: Ride-Along vs Representative Images Explained

When you run an Informed Delivery campaign, the images you submit determine how your mailpiece appears in subscribers' Daily Digest emails and dashboards. Get the specifications wrong, and USPS rejects your files. Get them right but ignore design best practices, and your campaign underperforms despite meeting technical requirements. This guide covers both—the exact specifications your images must meet, and the creative considerations that make the difference between a campaign that generates clicks and one that gets scrolled past.

USPS offers two image types for Informed Delivery campaigns, each serving a different purpose and requiring different specifications. Understanding when to use each type—and how to design for maximum impact within tight dimensional constraints—is essential knowledge for any business running enhanced direct mail campaigns.

Ride-Along Images: Specifications and Purpose#

A ride-along image appears below the grayscale scan of your mailpiece in the Daily Digest email. Think of it as a banner advertisement that accompanies your mail, providing a clickable call-to-action for recipients who see your piece in their preview.

Technical specifications for ride-along images:

| Requirement | Specification | |-------------|---------------| | Maximum dimensions | 300 × 200 pixels | | File format | JPEG only | | Color mode | RGB | | Maximum file size | 200 KB | | Aspect ratio | Fixed at 3:2 |

The dimensional limits are strict—USPS will reject images that exceed 300 pixels wide or 200 pixels tall, even by a single pixel. The 200 KB file size limit is generous for an image this small; you're unlikely to hit it unless using extremely high compression ratios that create visible artifacts.

Ride-along images must include a destination URL. When recipients click the image in their Daily Digest, they're taken to your specified landing page. The URL is set during campaign submission in the Mailer Campaign Portal, not embedded in the image file itself.

When to use ride-along images: The ride-along format works well when your mailpiece's grayscale scan displays clearly and you want to add a promotional element. A dental practice sending appointment reminders might use a grayscale scan of the postcard alongside a ride-along banner reading "Book Online – Save 10%" with a link to their scheduling page. The authentic appearance of the mail scan builds trust, while the ride-along provides an immediate action path.

Representative Images: Specifications and Purpose#

A representative image replaces the default grayscale scan entirely, showing recipients a full-color version of your mailpiece. This is valuable when the automated scan doesn't capture your design effectively—colorful postcards, branded envelopes, or pieces where the address side doesn't convey your message.

Technical specifications for representative images:

| Requirement | Specification | |-------------|---------------| | Maximum dimensions | 780 × 500 pixels | | File format | JPEG only | | Color mode | RGB | | Maximum file size | 200 KB | | Aspect ratio | Approximately 1.56:1 |

Representative images allow significantly more visual real estate than ride-along images, but they come with an important constraint: the image must reasonably represent your actual mailpiece. USPS reviews submissions and can reject images that don't match what's being mailed. You cannot use a representative image as a pure advertisement—it needs to look like the mail you're sending.

The practical implication is that representative images work best as high-quality photographs or scans of your actual mailpiece, rather than original creative designed specifically for Informed Delivery. A real estate agent mailing just-listed postcards might photograph the postcard showing the property image and listing details, then submit that as the representative image.

When to use representative images: Choose representative images when your mailpiece's value is primarily visual and the grayscale scan won't do it justice. Marketing mail with vibrant colors, product photography, or design-forward creative benefits from the full-color treatment. Conversely, if your mail is primarily text-based—like a letter or a simple postcard with basic information—the grayscale scan may actually look more authentic.

Using Both Image Types Together#

You're not limited to choosing one image type. Campaigns can include both a representative image (replacing the grayscale scan) and a ride-along image (appearing below it), giving you maximum visual impact plus a clear call-to-action.

The combination approach makes sense for campaigns where you want to showcase your mailpiece's design while still providing an obvious click target. A retail company promoting a seasonal sale might show the full-color representative image of their promotional mailer, with a ride-along banner below offering "Shop the Sale Now" with a direct link to the sale landing page.

Consider the visual hierarchy when using both types. The representative image gets primary attention as the main visual element—it should be your strongest visual asset, clearly showing what recipients will find in their mailbox. The ride-along image below it should drive action without competing visually, typically using simple, high-contrast design with clear text.

Design Best Practices for Small Formats#

Working within 300 × 200 pixels presents genuine design challenges. You have less space than most web banner formats and need to communicate value, include branding, and drive clicks—all while being viewed on mobile devices where the effective size shrinks further.

Prioritize readability over complexity. At ride-along image dimensions, intricate designs become muddy. Use high-contrast color combinations (dark text on light backgrounds, or vice versa) and ensure any text is large enough to read at small sizes. A good test: view your design at 50% zoom on your screen. If you can't read it easily, mobile viewers won't either.

Lead with your call-to-action. The ride-along image's purpose is driving clicks, so make the intended action immediately obvious. "Book Now," "Shop Sale," "Claim Offer"—direct, action-oriented text performs better than clever taglines that require interpretation.

Limit text to essential words. You don't have room for detailed copy. Three to five words for your primary message is typically the right range. If you need more explanation, save it for the landing page—the ride-along image just needs to earn the click.

Use brand colors strategically. Consistent brand colors help recipients recognize your business across the mail scan and ride-along image. But within the ride-along itself, prioritize the contrast between text and background over strict brand color adherence.

Consider the viewing context. Your ride-along image appears in an email alongside potentially several other mailpieces' scans. It needs to stand out from the surrounding content without feeling jarring or disconnected from your mail's visual identity.

Common Image Mistakes and How to Avoid Them#

Reviewing rejected submissions and underperforming campaigns reveals patterns worth avoiding.

Submitting images with wrong dimensions. The specifications are exact—299 × 200 works, but 301 × 200 fails. Always verify final dimensions before export, and don't rely on your design software's canvas size if you've used any scaling during the design process.

Using CMYK color mode instead of RGB. Print designers often work in CMYK, but Informed Delivery requires RGB. An image designed for print that gets exported without color mode conversion will be rejected. Check your export settings before saving the final file.

Exceeding file size limits. While 200 KB is generous, heavily layered or complex images can exceed it. If your file is too large, increase JPEG compression slightly rather than reducing dimensions—you need every pixel you're allowed.

Creating representative images that don't match the actual mail. USPS reviews representative image submissions against the mailpiece description. Significant mismatches lead to rejection. Use actual photographs or accurate renderings of your mailpiece, not generic promotional graphics.

Ignoring mobile viewing. The majority of Informed Delivery engagement happens on mobile devices. Design and test for mobile-first—if text is barely readable on a phone screen, redesign with larger, simpler elements.

Forgetting the destination URL context. Your ride-along image promises something (a discount, information, easy booking), and your landing page must deliver it immediately. Generic homepages or irrelevant destinations create friction that wastes the click you earned.

Preparing Files for Submission#

Before uploading images to the Mailer Campaign Portal, run through this checklist to avoid rejection or display issues.

Verify dimensions are exactly at or below limits. For ride-along images, confirm your file is 300 × 200 pixels or smaller. For representative images, confirm 780 × 500 pixels or smaller. Dimensions must be in whole pixels—no fractional values.

Confirm file format and color mode. Export as JPEG (not PNG, GIF, or other formats) using RGB color mode (not CMYK, grayscale, or indexed color). These requirements exist for consistent display across email clients and devices.

Check file size. Each image must be under 200 KB. If you're over the limit, try increasing JPEG compression in small increments until you're under 200 KB without visible quality loss.

Review visual quality at final size. View the image at 100% zoom—what you see is what recipients see. Look for compression artifacts, text readability issues, or color problems that might have emerged during export.

Test on mobile if possible. Send the image to yourself and view it on your phone. Mobile display is the most demanding context and will reveal any readability or clarity issues.

Grayscale vs Color: What the Data Shows#

One interesting finding from USPS program data challenges assumptions about image strategy. Grayscale images—the default scan appearance—generate approximately 13% higher click-to-open rates than color representative images in aggregate campaign data.

The interpretation matters. This doesn't mean grayscale is universally better, but it suggests that the authentic "this is really coming to my mailbox" appearance of grayscale scans builds trust with recipients. Overly polished representative images may feel more like advertisements than mail previews, creating a subconscious hesitation.

The practical takeaway: don't assume you need representative images for every campaign. If your mailpiece scans clearly in grayscale and looks like legitimate mail, that authentic appearance has value. Reserve representative images for situations where grayscale genuinely fails—pieces with reversed text, low-contrast designs, or visuals that lose meaning without color.

Testing remains the best approach. If your volume allows, run campaigns with different image strategies against portions of your list and compare actual click-through rates for your specific audience and creative.

Frequently Asked Questions#

Can I use PNG or GIF files instead of JPEG?#

No. USPS only accepts JPEG format for Informed Delivery campaign images. This applies to both ride-along and representative images. If your design was created in another format, you must convert it to JPEG before submission.

What happens if my image is slightly over the dimension limits?#

Your campaign will be rejected during the submission process. The Mailer Campaign Portal validates image dimensions against exact pixel limits, and there's no flexibility—a 301-pixel-wide ride-along image fails just as clearly as a 500-pixel-wide one.

Can my representative image show the back of my mailpiece instead of the front?#

Your representative image should reasonably represent what your mailpiece looks like. Since the default grayscale scan shows the address side (front), a representative image typically shows that same perspective. However, if your mailpiece's value is on the reverse side, you could show that—just ensure USPS doesn't flag it as not matching your mail.

How do I know if my design works on mobile devices?#

The most reliable test is viewing the actual image on a mobile device. Export your design at final dimensions, email it to yourself, and open it on your phone. If text is hard to read or details are unclear, simplify your design.

Should I include my logo in the ride-along image?#

Including recognizable branding helps recipients connect the ride-along image to both your mailpiece and your business. However, logos should be sized and placed so they don't compete with your call-to-action. A small logo in one corner is typically sufficient—you don't need it to dominate the limited space.

Making Every Pixel Count#

The constraints of Informed Delivery image specifications force design discipline. You can't overwhelm recipients with massive graphics or lengthy copy—you have 300 × 200 pixels (or 780 × 500 for representative images) to make your point and earn a click.

That constraint is actually valuable. It requires focus on what matters: clear communication, obvious calls-to-action, and designs that work at small sizes on mobile screens. The businesses that succeed with Informed Delivery campaigns treat the specifications not as limitations but as guardrails that force better, more focused creative.

Start with your goal—what action do you want recipients to take?—and design backward from there. Every element in your image should serve that goal. If something doesn't contribute to the click, it's taking space from something that could.

When you submit images that meet specifications and follow design best practices, you maximize the return from every mailpiece that reaches an Informed Delivery subscriber. In a landscape where 72.9 million consumers are previewing their mail digitally, that's an opportunity worth optimizing for.