Plain
No fragrance or gimmicks.
Updated
Bird guides
Plain paper is the safest cage liner for most pet birds. It is low-fume, easy to change, and lets you see droppings clearly. Avoid scented liners, dusty bedding, cat litter, corn cob, walnut shell, and loose materials that hide mess or mold.
A good liner helps you clean and monitor health. It should not add fragrance, dust, or guesswork.

Cleaning and Air Safety
Plain paper is the safest cage liner for most pet birds. It is low-fume, easy to change, and lets you see droppings clearly. Avoid scented liners, dusty bedding, cat litter, corn cob, walnut shell, and loose materials that hide mess or mold.
Build a simple daily cleaning rhythm.
Use the hub for nearby questions after this answer.
Use supplies after the care plan is clear, not before.
Pick gear that makes the daily routine easier to repeat.
No fragrance or gimmicks.
Droppings must be easy to inspect.
Bird lungs are sensitive.
Wet liner should not sit.
Loose bedding hides problems.
Daily changes should be simple.
Use plain paper, paper towels, or other unscented flat paper that lets droppings stay visible.
Droppings are health information. Loose bedding can hide changes in color, amount, wetness, blood, or undigested food.
Scented products, shavings, dusty substrates, and litter-style materials can irritate airways or make cleaning harder.
Even the safest liner becomes a problem if it stays wet, moldy, or covered in old food and droppings.
Choose the boring liner that makes daily checks obvious.
Plain newspaper is often used, but avoid glossy, heavily inked, scented, or wet paper.
It is a poor default because it can hide droppings, hold moisture, and mold.
No. Cat litter is dusty, scented or clumping in many cases, and not appropriate for bird cages.
Use the cage design safely. The key is that the bird cannot shred or eat soiled liner and you can inspect droppings.
Use these after the care plan is clear. Match size and materials to the bird you actually keep.
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Plain paper makes droppings easier to monitor without scented products.

Keeps daily cage wipe-downs simple without fragrance or harsh residue.

Separate clean food and water dishes that are easy to wash every day.

Tracks food, weight, sleep, droppings, behavior, and vet questions in one place.