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If you already have a designer or artwork you like, you can skip Mailr’s AI design flow and bring your own postcard. Mailr checks the files against its print rules, lets you place the QR code, and adds the design to your library. Start at Designs → Upload your own design, or use the Upload your own design button in the header of Your designs. The page opens with the kicker MANUAL DESIGN and the line “Bring your own print-ready 6 × 9 in postcard artwork. We’ll check it and add it to your library, ready to use.” The wizard has three steps — 1 Design details · 2 Artwork · 3 Preview & finish — with QR placement happening on the Artwork step; we give it its own heading below.
Owners and Staff can both upload designs — design work isn’t Owner-only. Members can only view. See Team & roles.

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Card specs — hand this to your designer

Every Mailr postcard is 6 × 9 in, printed on both sides. You supply one PNG per side. Step 1 also offers downloadable guides: Front template (PNG) and Back template (PNG), which mark trim, safe area, and the postal keep-out. If Photoshop or Illustrator kits aren’t listed yet, the page says so — “the PNG guides above have the full print spec.”

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Upload your artwork

1

Name the design and pick a front style

Fill in Design name and an optional Description. Then choose a Front style:
  • Personalized photo front — “Each recipient’s own home photo shows through your artwork with your design on top — via a transparent window, or behind a semi-transparent full-card design.”
  • Classic front — “A flat, opaque design printed exactly the same for every recipient. No personalization.”
This choice decides how your file is checked, so get it right before you export. The Artwork specs panel on this step repeats the full spec.
2

Drop in the front and back

Step 2 has two dropzones reading Drop your PNG here or click to browse, with the hint PNG · 2775 × 1875 px · up to 15 MB. Each file runs an Artwork check with pass/fail rows.
A clean file shows a green This front is print-ready. or This back is print-ready. banner.
Flip the Print guides switch to overlay Trim — card is cut here, Safe area — keep text inside, and, on the back, Postal area — keep clear.
3

Place the QR code

Set the QR position on this step (details below). You can’t continue until the placement passes the edge and postal-area rules.
4

Preview and finish

Step 3 shows the front and back previews with the same guides. The note “Sample home shown — each recipient sees their own home.” means exactly that: the house in the preview is a stand-in. Press Finish — use this design.
You’ll see “Your design is ready to use” — “…passed every print check and is active in your library now — pick it whenever you start a campaign.” From there, Start a campaign with it or Back to your designs.

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Place the QR code

Every postcard carries a unique QR code per recipient — a code that opens that household’s own landing page. On an uploaded design you decide where it prints. The picker has two tabs:
  • Draw on Template — click and drag a box on your artwork (hint: “Click and drag to draw QR zone”). The box labels its own size.
  • Enter Coordinates — type X, Y, Width, and Height in pixels at 300 DPI.
The instructions read: “Drag the box to where the QR code should print. Keep it out of the shaded postal area (bottom-right corner). We’ve started it in a safe spot for you.” Two rules block you until they pass: the box must sit at least ¼ inch in from every edge, and on the back it must stay clear of the bottom-right postal area. If you draw a small box, Mailr grows it to its minimum printable size, centered where you put it, and bakes a clean white pad behind it so it scans over your artwork. A front QR is optional — the switch reads Add a QR code to the front: “Optional. QR codes are generated per recipient — we’ll bake a clean white pad here so it stays scannable over your artwork.”
The QR shown in the preview is a placeholder: “Preview only — the real QR code is generated per recipient.” Real codes are produced when the campaign is produced.

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Keep the postal area white

The bottom-right corner of the back is reserved: the postal service prints the mailing address and postage there, so it must be pure white with no artwork in it. If yours has something in it, use the one-click Auto-clear postal area button — “This paints the bottom-right postal corner pure white so mail can be addressed there.”

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Approval

Uploaded designs skip the approval checklist that AI-generated designs go through. Passing the artwork check is the gate — once both sides are print-ready and the QR placement is valid, the design lands Active in your library with an Uploaded badge and is immediately pickable when you build a campaign.

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Fix a rejected file

“This artwork is 2550 × 1650 pixels. Please export the artwork at exactly 2775 × 1875 pixels (6.25 × 9.25 inches at 300 DPI, full bleed).” That’s the same size as the spec table — 9.25 in wide by 6.25 in tall. Re-export at exactly 2775 × 1875 px. Scaling a smaller file up will look soft in print — go back to the source file instead.
The file isn’t a PNG, or it’s corrupted. Export a fresh PNG (not JPG, not PDF, not TIFF) and upload again.
“This design is set up as a fixed front but contains transparent areas. Export a flattened, fully opaque image with no transparency.” Flatten the file onto an opaque background, or switch the Front style to Personalized photo front if you meant the home photo to show through.
“This design is fully opaque, so the home photo has nowhere to show through. Leave the photo area fully transparent — or use semi-transparent artwork anywhere the photo should show behind your design.” Delete the pixels in the photo window and export the PNG with real transparency.
“This file is almost completely blank…” Usually a hidden layer or an export from the wrong artboard. Check the file opens with your artwork visible, then re-export.
“The bottom-right postal area must remain pure white… or use the auto-fix to clear it to white.” Press Auto-clear postal area, or move your artwork out of that corner and re-export.
Move the box at least ¼ inch in from every edge — “Move the front QR at least ¼ inch in from every edge.” On the back it also has to sit clear of the shaded postal corner: “Move the QR at least ¼ inch in from every edge and clear of the bottom-right postal area.”

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Next steps

What's personalized

Exactly which parts of a card change per recipient.

QR codes

How tracking codes are placed and what happens on a scan.

Create a campaign

Put your uploaded design in the mail.

Design overview

Templates, designs, and the brand kit in one place.