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Yes, in most air fryers, as long as the foil goes inside the perforated cooking basket, is held down by food, and does not cover the holes in the basket floor. Never line the drawer underneath the basket, never let foil touch the heating element, and never preheat with a loose sheet in an empty basket — the fan will lift it. Skip foil entirely for acidic or heavily salted foods, which react with aluminum. Check your own manual: a minority of models, particularly those with an exposed bottom element, forbid foil outright.
Where exactly should the foil go?
Inside the basket, under the food, and nowhere else. An air fryer is a small convection oven: a fan drives hot air down past a heating element and through the perforated basket so it reaches every surface of the food. Foil laid inside the basket with food sitting on top stays put and interferes with only the base of that airflow. Foil laid in the drawer beneath the basket, wrapped around the basket exterior, or draped over the heating coil interferes with the whole system. Leave a clear margin of at least an inch around the foil so air can pass around the edges.
What happens if foil blocks the basket perforations?
The appliance runs hotter than it should and your food cooks worse. Those holes are the return path for circulating air; sealing them turns a convection oven into a covered pan. Food browns on top and steams underneath, cook times stretch, and grease pools on the foil instead of draining into the drawer, where it can smoke once it exceeds its smoke point. On models where the thermostat sits away from the obstructed zone, the element simply keeps firing to hit a temperature the blocked chamber cannot register normally. If you are chasing crunch, the honest answer is to use no liner at all.
Why is preheating with foil the dangerous part?
Because nothing is holding it down. During preheat the basket is empty and the fan is at full speed, and a light sheet of foil will lift, tumble and contact the heating element. Aluminum will not melt at those temperatures, but foil bridging an energized element can arc and scorch, and any grease residue on it ignites readily. The National Fire Protection Association consistently reports cooking equipment as the leading cause of home structure fires, and the avoidable version of that story starts with a liner going in before the food does. Preheat empty, then add the foil and the food together.
Which foods should never sit on foil?
Anything acidic or heavily salted. Tomato sauce, citrus, vinegar marinades and salt-heavy rubs react with aluminum, and Reynolds Kitchens explicitly warns that highly acidic or salty foods can pit foil and cause discoloration where they sit. You will see the evidence as gray specks and pinholes on the used sheet. Sugary glazes are a separate problem: they scorch onto the foil, weld it to the basket and smoke. Use parchment for those, or cook directly in the basket.
What do air fryer manufacturers actually say?
Guidance is more consistent than the internet suggests: foil in the basket is broadly accepted, foil in the drawer or base is broadly forbidden. Model-specific manuals override any general rule, and units that heat from below are the ones most likely to prohibit foil entirely.
| Placement | Verdict | Why |
|---|---|---|
| In the basket, food on top | Generally allowed | Weighed down, limited airflow loss |
| Covering the whole basket floor | Avoid | Seals the perforations, blocks circulation |
| Lining the drawer under the basket | Do not | Airflow path and grease channel; often near the heat source |
| Loose sheet during preheat | Do not | Fan lifts it into the element |
| Wrapped around the exterior or vents | Do not | Traps heat inside the housing |
Is parchment paper a better option?
For most cooks, yes. Perforated parchment rounds sold for air fryers are punched precisely so air still moves through, which foil cannot do. The catch is the temperature rating — many parchment papers top out around 420°F to 450°F, so read the box before a 400°F cook and never let the paper touch the element. Silicone liners sit in between: reusable and heat-tolerant, but solid-bottomed, so they cost you the same crisping foil does.
| Liner | Airflow | Heat limit | Best for |
|---|---|---|---|
| No liner | Full | Appliance max | Fries, wings, anything crisp |
| Aluminum foil | Blocked underneath | Any air fryer setting | Saucy, glazed or messy items |
| Perforated parchment | Good | Often 420–450°F | Delicate or sticky foods |
| Silicone liner | Blocked underneath | Typically 450°F+ | Reusable everyday cleanup |
Where to go next
If foil is going in because cleanup is grim, fix the cleanup instead — how to clean an air fryer and whether the basket is dishwasher-safe both help. Foil misuse is also a common cause of air fryer smoking, and what you cannot cook in an air fryer covers the rest of the limits. Shopping? The best air fryers ranks models on aggregated owner ratings, and everything lives under the small kitchen appliances hub.
We never buy or physically handle the products we rank — our picks come from aggregated owner reviews and expert consensus, explained on how we rank. Your appliance manual is the final authority on liners in your specific model.