USPS Flat Rate Shipping Label Maker — Free
USPS Flat Rate shipping uses special Priority Mail boxes where you pay one flat price regardless of weight — if it fits, it ships. This makes Flat Rate the most economical option for heavy items that fit in the provided boxes. Our label maker creates labels formatted with the correct Flat Rate indicators and Priority Mail service markings. Choose from Small, Medium, and Large Flat Rate boxes, plus Flat Rate envelopes and padded envelopes.
Delivery Time
1-3 business days (Priority Mail)
Best For
Heavy items that fit in Flat Rate boxes at one fixed price
Carrier
USPS
USPS Flat Rate Shipping Tips
- Order free Flat Rate boxes and envelopes from USPS.com — they are completely free.
- The Large Flat Rate box can hold up to 70 lbs for one flat price, making it excellent for heavy items.
- Flat Rate is only worth it for heavier packages — for light items, regular Priority Mail is cheaper.
- You must use official USPS Flat Rate packaging — you cannot use your own boxes with Flat Rate pricing.
- Flat Rate Padded Envelopes are ideal for books, DVDs, and small electronics.
Label Preview
USPS-STYLE FORMAT
From:
Sender address
Ship To:
Recipient address
Enter reference # to generate barcode
REF-000000
shippinglabel.co
5 fields needed to generate
Ship like a pro from $9/mo. Unlimited clean labels, 4×6 thermal printing, saved addresses. See plans → Cancel anytime.
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How it works: We format the label with your barcode/QR. Buy postage from your carrier (USPS, UPS, FedEx, DHL) — they add the tracking barcode at drop-off.