How to Design Your Custom Mailer: Artwork Specs, Proofs & Templates
Designing a custom mailer isn''t the same as designing a business card or a website graphic. The material is flexible, the print surface curves, and small file mistakes get expensive at 5,000 units. This guide walks through everything you need to know before you upload artwork to our online designer or send us a print-ready file.
1. Start with the right file format
The best files for custom mailer printing are vector (AI, EPS, PDF) because they scale to any size without losing quality. If you only have raster art (PNG, JPG), it needs to be at least 300 DPI at final print size — a 72 DPI web logo will look pixelated on a 10x13 mailer.
- Preferred: Adobe Illustrator (.ai), print-ready PDF, or vector EPS
- Acceptable: 300 DPI PNG or TIFF at 100% print size
- Avoid: screenshots, social-media exports, Word/PowerPoint files
2. Use CMYK, not RGB
Screens display color in RGB (red, green, blue). Printing presses use CMYK (cyan, magenta, yellow, black). Bright RGB blues and neon greens simply cannot be reproduced in CMYK — they''ll shift toward purple or muddy green on press. Convert your file to CMYK before submitting, or expect color shift.
Pantone (spot) colors are available on flexographic runs but usually not on digital print. If exact brand color matters, ask for a physical proof.
3. Bleed and safe margins
Mailers are cut and sealed after printing, so anything within 1/8" of the edge risks being trimmed off. Two rules:
- Bleed: extend background colors and images 0.125" past the trim line on all sides.
- Safe area: keep logos, text, and anything you don''t want cut 0.25" inside the trim line.
We provide a free template (dieline) for every mailer size — download it from the product page or the designer tool and design directly into the safe area.
4. Digital vs flexo printing — which do you need?
| Digital | Flexo | |
|---|---|---|
| Best for | Low-medium runs, full-color art, photos | High volume (5,000+), 1–3 spot colors |
| Setup fees | None | Plate charges apply |
| Color match | CMYK only | Pantone available |
| Turnaround | Faster | Longer (plate making) |
Most ecommerce brands ordering under 5,000 mailers should stick with digital — no plate fees, faster turnaround, and full-bleed color is standard.
5. Sizing your artwork to the mailer
Design at 100% of the final flat mailer size. If you''re doing a 10x13 bubble mailer, your artboard is 10x13 plus bleed (10.25x13.25). Common size-to-product pairings:
- Jewelry, small accessories: #000 (4x8) or 6x9
- Books, small apparel: #2 (8.5x12) or 10x13
- Bundled apparel, shoes: #5 (10.5x16) or 14.5x20
See our full bubble mailer size guide and poly mailer size guide for printable-area dimensions on each.
6. Where to place logos, addresses, and QR codes
- Logo: center of the front panel, minimum 0.5" from any edge
- Return address block: upper-left, minimum 12pt type
- Shipping label zone: leave a clear 4x6 area on the front for the label
- QR code: minimum 1" square, 0.25" white quiet zone, tested from a real phone
- Social handles / thank-you note: back panel — great real estate for unboxing content
7. Getting a proof (and why it matters)
We send a free digital proof for every custom order before we print anything. Review it on a calibrated monitor and check:
- Spelling and phone numbers
- Colors look close to your brand
- Nothing important is inside the bleed zone
- Logo is sharp, not pixelated
For high-volume runs or exact color match, request a physical proof — a printed sample of your artwork on the actual mailer stock.
8. Design it yourself in the browser
If you don''t have a designer, our free online mailer designer handles bleed, safe zones, and sizing automatically. Upload a logo, add text and QR codes, pick a background color, and preview both sides before checkout.
Design a bubble mailer → · Design a poly mailer →
Frequently asked design questions
What file format do you need for custom mailer artwork?
Vector files (AI, EPS, or print-ready PDF) are best. Raster files (PNG, TIFF) work if they''re 300 DPI at final print size. Avoid screenshots, Word docs, and low-res web images.
Do you provide a design template or dieline?
Yes — every mailer size has a free downloadable template with bleed and safe-zone guides marked. The online designer applies these automatically.
Why does my printed mailer look different from my screen?
Screens use RGB; printers use CMYK. Bright RGB colors (especially blues, greens, and neons) shift when converted. Design in CMYK from the start, or request a physical proof for critical brand colors.
How much bleed do I need?
0.125" (1/8 inch) on every edge. Extend background colors and images past the trim line so the finished mailer has no white slivers after cutting.
Can I print full-bleed or on both sides?
Yes to both. Full-bleed edge-to-edge printing is standard on digital, and both-side printing is available on all our bubble and poly mailers.
Can I print white ink on a colored mailer?
Yes — white ink is available on black and colored poly mailers. Bubble mailers are typically printed on kraft or white stock; talk to us if you need white on a dark base.
Will you help me if I don''t have a designer?
Yes. Use the online designer for DIY, or contact us for design assistance — we''ll turn a rough logo and brief into a print-ready file.
Do I get a proof before you print?
Every custom order gets a free digital proof. Physical proofs (printed on the actual mailer stock) are available on request for large runs.
What''s the minimum order to print custom?
Our low-quantity custom bubble mailers start at just 100 units. Standard custom runs start at 500.
How long does design to delivery take?
Digital proof within 1–2 business days, revisions same-day, and production + delivery typically 10–14 business days after proof approval. Rush available on request.
Ready to design?
Open the Mailers HQ online designer and build your custom mailer in the browser — no software to install, template and bleed handled for you, and proceed straight to checkout when it''s ready.