PDF prints too light

Thirty-second diagnosis

1. Print a page of a different document — anything you know prints well.
2. If that also prints faint, stop: this is a printer problem. Check toner-save mode, the cartridge, and the density setting.
3. If it prints normally, the faint document is at fault. Continue.
4. Open the faint PDF and zoom to 400%. If the text is grey rather than black on screen, the colour is the problem.
5. If the text looks black on screen but very thin, the font weight is the problem.
6. Either way, upload the file above — darkening handles the first case, and Thicken thin text handles the second.

Why screens lie about contrast

A monitor is an emissive display: its white is a light source, and the human eye reads a grey shape against a bright field as clearly darker than it really is. Paper is reflective; its brightest possible white is the paper itself under the light in your room.

So the same 45% grey that reads as "dark enough" on screen prints as an obvious grey. Add a printer running in toner-save mode, and it lands somewhere near invisible. This is a display-technology problem, not a mistake you made.

Cases this fixes

• Bank statements and invoices exported with light grey body text.
• Scanned contracts where the signature is barely visible.
• Shipping labels and receipts printed from thermal originals.
• Government and legal forms photocopied several times over.
• Design-tool exports that use 60% grey for what should be black.

Cases this does not fix

• A printer that is genuinely low on toner or ink.
• A worn drum unit, which usually shows as banding rather than uniform faintness.
• Draft or eco mode left on in the driver or on the printer panel.
• Text that was never captured by the scan in the first place.