USPS pre-flight · before the press

Catch the reject before you print 5,000 of them.

Upload the address side. Get a marked-up pass/fail against USPS clear zone, indicia, address block and size rules. Every finding cites its rule.

Check a postcard free Read the rules

No signup for your first check. Advisory only, never a USPS approval.

Postcard address side with pre-flight zones marked

FAIL · art in barcode clear zone

Four checks that cause most delays

Measured

Barcode clear zone

Bottom 5/8" x right 4-3/4" measured for any ink.

AI-judged

Indicia placement

Permit imprint or stamp box in the upper right.

AI-judged

Address in OCR area

Delivery address inside the scanner's read window.

Measured

Size & mail class

Trim, bleed, aspect ratio and class eligibility.

Upload

PDF for exact inches, or PNG/JPG.

Pick size & class

4x6 to 8.5x11. First-Class, Marketing Mail, EDDM.

Get the markup

Pass/fail, boxes on the art, PDF report to send the designer.

Cheaper than one reprint

All plans

Free

3 checks / month

10-Check Pack

$29 one-time

10 checks · $2.90 / check

Agency Pro

$49 / month

100 checks / month

Printer API

$149 / month

1,000 checks / month

For print shops & fleet apps

One API call per job: verdict, findings, report link.

curl -X POST /api/public/preflight \
  -H "x-api-key: pf_..." -H "content-type: application/json" \
  -d '{"size":"6x9","mail_class":"marketing","image_url":"https://.../back.jpg"}'