Will transformed shipping labels (USPS, UPS, FedEx) still scan?

Yes! Optical barcode readers rely on high contrast rather than black ink specifically. Selecting Navy Blue (#000080) or Dark Cyan creates sufficient contrast for 1D and 2D barcode scanners.

Print PDFs & Labels Without Black Ink

Q: How do I print a PDF when I run out of black ink?

Upload your PDF or shipping label to PDFColour.com, choose a target color like Navy Blue or pick a custom color with the color selector, and click convert. The tool swaps all black text to color so your printer uses cyan, magenta, and yellow cartridges.

Swap dark text or backgrounds to solid custom colors, gradients, or compressed formats so your printer uses remaining color cartridges.

Click to upload or drag & drop PDF / Label

100% Private Client-Side Processing • No Watermarks • No Server Uploads

Color Mode Strategy:

Select or Pick Custom Color:

Custom Picker:

Tint Page Background (e.g., Soft Yellow/Cream for easy reading)

Pages to Convert:

Compression & Quality:

Darkness Sensitivity Threshold:

Pure Black Only Includes Dark Grays

Why Printers Refuse to Print Without Black Ink

Understanding printer driver locks and how text color conversion fixes it.

1. Empty Black Cartridge Lock

Most HP, Canon, Epson, and Brother inkjet printers lock printing when the black cartridge reads empty, even if full color cartridges remain.

2. Optimized Pixel Recoloring

PDFColour isolates pure black and gray vector/raster text pixels in your document, substituting them with high-density Navy Blue, Dark Red, or Custom Hex tones.

3. Color Nozzle Routing

When you print the recolored document, your printer driver automatically routes ink commands to the active Cyan, Magenta, and Yellow printheads.

Frequently Asked Questions

How do I print a PDF when I run out of black ink?

Upload your PDF to PDFColour.com, select a dark target color (like Navy Blue or pick a custom hex color), and click Convert. Download the generated file and hit print. Your printer will use remaining color cartridges to print readable text.

Will converted shipping labels (USPS, UPS, FedEx) scan properly?

Yes. Barcode scanners use optical contrast to read bar lines. Dark Navy Blue (#000080) and Dark Cyan provide near-identical optical contrast to black, allowing full scannability.

How is PDFColour better than Supertool or i2pdf?

PDFColour runs 100% locally in your browser, keeping your documents private and free of watermarks. It also supports custom color pickers, vertical text gradients, background page tinting, and fast 32-bit pixel rendering.