If your printer refuses to print because the black cartridge is empty — and you need to ship something today using USPS — you’re not alone.
Many home printers will not print a shipping label if black ink is depleted, even if color ink is full.
The good news: you can convert your USPS label to a dark color and print it using color ink only.
Why Printers Won’t Print USPS Labels Without Black Ink
Most USPS labels are:
- Black text
- Black barcode
- Black tracking code
- Black address block
When black ink runs out, printers either:
- Print blank text
- Print faded barcodes
- Refuse to print entirely
This is especially frustrating if you just created your label using USPS Click-N-Ship from the United States Postal Service website.
Can USPS Accept a Blue Shipping Label?
Yes.
USPS scanners read contrast patterns — not color itself.
As long as:
- The barcode is dark
- The background is white
- The print is crisp
The label will scan normally.
Dark blue, navy, and deep green work well.
Avoid light colors.
How to Print a USPS Label Using Only Color Ink
Instead of buying a new cartridge immediately, you can:
- Download your USPS shipping label PDF
- Upload it to SuperTool’s PDF Color Changer
- Select dark blue
- Download the recolored PDF
- Print normally
Because the document is no longer black, your printer uses color ink instead.
No editing software required.
Best Color Settings for USPS Labels
Recommended:
- Navy blue
- Dark green
- Deep purple
Not recommended:
- Yellow
- Light blue
- Pastel colors
- Gray
Always maintain high contrast.
When This Is Especially Helpful
- You’re shipping Priority Mail today
- You’re mailing a return package
- You’re printing a prepaid label late at night
- Stores are closed and you need to ship now
Instead of delaying shipment, you can print immediately.
Try It Now
If your black cartridge is empty but your color ink still works, you can:
