Pages come out wrinkled, creased or curled

Paper soaks up moisture from humid air and then curls when heated or wetted by ink. Keep it sealed and flat, don't leave a large stack in the tray for weeks, and try flipping the stack over in the tray.

Many laser printers have a rear output door; opening it lets pages exit straight out instead of curling around the internal rollers. Use it for card, labels and envelopes too.

Plain paper ripples when soaked with ink, which is called cockling. For photos, graphics or full-page color, use heavier inkjet or photo paper.

Diagonal creases usually mean the sheet entered at an angle. Set the guides snugly, don't overfill the tray, and check the paper path for a scrap or obstruction.

Use envelopes suited to your printer type and load them as your manual shows. Some laser printers have envelope levers near the rear that reduce pressure on envelopes; your manual will say if yours does.

In Settings > Bluetooth & devices > Printers & scanners > your printer > Printing preferences, choose the type that matches the paper. On a laser, a heavy or card setting used with ordinary paper makes the fuser hotter and adds curl, so try plain or light.

On an inkjet, choosing a photo paper type or the highest quality while printing on plain paper lays down more ink than it can absorb. Match the paper type and use Normal quality for documents.

Some laser printers have a curl-reduction or humidity option in the printer's own menu or in the driver's device settings. Check your manual for the exact name on your model.

In the print dialog, open Media & Quality and choose the media type that matches your paper, not a heavier one.

On an inkjet, the highest quality settings lay down more ink and make plain paper ripple. Use Normal for everyday documents.

Some printers offer curl-reduction or humid-environment settings in their control panel or built-in web page, which you can open with Show Printer Webpage under Options & Supplies on many models.