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Printer diagnostics

Test what the browser can see. Know when it cannot.

Print controlled DeviceOK references to separate document-specific problems from repeatable color, alignment, banding, smearing or scaling defects.

Run these first

Relevant live checks

Printer Color Test PagePrint CMYK and RGB reference blocks to inspect missing colors and obvious print-quality problems.

Printer Grayscale Test PagePrint a stepped grayscale to inspect tonal separation, color casts, and blocked shadows or highlights.

Printer Alignment Test PagePrint fine lines and alignment references to inspect registration and obvious misalignment.

Printer Small Text Test PagePrint small text at several sizes to inspect sharpness, edge quality, smearing, and readability.

Printer Margin & Clipping TestPrint border references to inspect clipping, scaling, centering, and unexpected page margins.

First diagnostic sequence

Do the high-signal checks before risky changes

1
Print the reference closest to the symptom
2
Compare a second document
3
Run the printer maker's own diagnostic if the same defect repeats

What DeviceOK/browser can help check

Generate controlled printable patterns
Help compare page scaling and print defects
Record what the user observes

What this browser page cannot prove

See the physical paper automatically
Read ink/toner sensors generically
Run model-specific nozzle/head maintenance