A liner can look like an easy way to avoid washing an air-fryer basket. Before buying one, check whether your appliance permits it. Restrictions differ, and some manufacturers prohibit paper or foil in particular models because it can interfere with the way the appliance works.
Do not treat a product marketed as an air-fryer liner as permission from your appliance manufacturer. The seller may be describing a general use while your model has a different basket, heating arrangement or airflow requirement. The appliance instructions come first.
If a liner is allowed, check its own limits
Confirm the material, temperature range and intended use. Parchment, wax paper, foil and reusable silicone products are not interchangeable. A temperature rating alone does not establish that an item is suitable for a fan-driven countertop appliance.
Follow the permitted loading method. Never preheat with unsecured lightweight paper that could lift toward a heating element. Keep any liner in the position the appliance and liner instructions allow, and do not cover openings that need to remain clear.
Size matters, but a close fit is not always the objective. A liner that fills every corner may block circulation or create a different cooking surface. Avoid folding, cutting or improvising in ways that conflict with the instructions. Reusable mats should not be trimmed unless their manufacturer specifically allows it.
Cleanup still has to happen
A liner does not remove the need to inspect the basket and appliance after cooking. Grease and crumbs can collect elsewhere, and a reusable insert has its own corners or grooves to wash. Allow the appliance to cool and clean it according to the manual.
Consider whether the liner changes how you turn or remove food. A flexible tray may bend under a meal, and a paper edge is not a carrying handle. Use the intended basket or suitable utensils for handling hot contents.
If the model prohibits liners, the decision is simple: use its cooking surface as directed and follow the cleaning routine. If it permits them, judge whether they actually simplify your normal meal rather than buying a large pack before trying the approved arrangement.