Can You Put Foil in an Air Fryer? Safe Use and What to Avoid
Yes, in most air fryers — if it's weighed down by food and clear of the element. How to use foil safely, foods to avoid on it and better liners.
In most basket-style air fryers you can use a small amount of aluminium foil, as long as it sits in the bottom of the basket under the food, does not cover all the holes, and cannot touch or blow into the heating element. Never put foil in on its own during preheating, avoid it with acidic foods such as tomatoes and citrus, and always check your manual — some manufacturers advise against foil altogether.
Foil is one of the most common things people reach for when they first get an air fryer, usually to save on washing up. The good news is that it is allowed in many models. The catch is that an air fryer works by blowing hot air at high speed, so anything that blocks that air or flaps about inside the drawer can cause problems.
This guide explains how to use foil safely, when to skip it, and which alternatives do the job better for different foods.
Why airflow matters
An air fryer is a compact fan oven. The element sits above the food and a fan pushes hot air down and around the basket, then back up through the holes or grille in the base. That circulation is what crisps the outside of chips, wings and breaded food.
If you line the whole basket with foil, the air can no longer pass underneath. The top of the food browns, the bottom steams in its own juices, and cooking takes longer. In some designs it can also cause the unit to run hotter than intended around the element.
How to use foil safely
If your manual allows foil, these rules keep it working with the air fryer rather than against it.
- Put food on top of the foil straight away so its weight holds the foil down. Loose foil can lift in the fan's draught.
- Leave a gap of at least a couple of centimetres around the edges so air can still move through the base.
- Fold the edges up slightly to make a shallow tray if you want to catch marinade or fat.
- Keep foil well below the heating element. Never tuck it over the top of food in a way that brings it close to the element.
- Do not put foil in the drawer during preheating unless something is sitting on it.
- Use a fresh piece each time and check it has not torn before you take the drawer out.
Tip: Some air fryers have a plate or crisper tray that sits in the bottom of the drawer. Foil goes on top of that, under the food — never underneath it.
Foods that should not go on foil
Aluminium can react with acidic and very salty foods. You may see small grey marks on the food or pin-holes in the foil, and it can give a metallic taste. It is best to use parchment or a silicone liner instead for:
- Tomato-based sauces and tray bakes
- Anything with lemon, lime or vinegar in the marinade
- Heavily salted or brined foods
- Fruit such as rhubarb or apples
When foil is genuinely useful
Foil earns its place for messy or delicate jobs. A shallow foil tray stops sticky glazes on chicken wings or ribs burning onto the basket. A loose foil parcel is a good way to cook fish fillets with butter and herbs, or garlic bread, where you want gentle heat rather than crisping.
You can also cover the top of a joint or a pie loosely for the last part of cooking to stop it over-browning — but only if your basket is deep enough that the foil stays well clear of the element and is tucked firmly underneath.
Alternatives: parchment, liners and tins
Each option has its strengths. Pick according to what you are cooking.
- Perforated parchment rounds: let air through the holes, so food still crisps. Must always be weighed down by food.
- Silicone liners: reusable and easy to wash. They block more air than parchment, so they suit saucy or sticky foods rather than chips.
- Paper liners (bowl-shaped): handy for wings and tray bakes; check they are rated for the temperature you are using.
- Small metal tins or oven-safe dishes: good for eggs, crumbles and small bakes. Make sure they fit with space around the sides.
Things that should never go in
Do not use cling film, plastic containers that are not rated as ovenproof, kitchen roll on its own, or greaseproof paper that is not weighed down. Paper and light liners can be sucked up into the element and scorch or catch fire. Glass and ceramic dishes are only safe if they are marked ovenproof and fit comfortably.
If you notice smoke, switch off at the plug, keep the drawer closed for a moment and let the unit cool before investigating.
Frequently asked questions
Which side of the foil should face up?
It makes little practical difference for cooking. The shiny and dull sides are a result of how foil is manufactured; non-stick foil is the exception, and its packaging tells you which side to use.
Can I put foil in a dual-drawer air fryer?
Usually, under the same rules: weighed down by food, not covering the whole base, and clear of the element. Check your model's manual, as guidance differs between brands.
Is parchment better than foil in an air fryer?
For crisp food, perforated parchment is often better because air can pass through. For sticky marinades or foil parcels, foil works well. Avoid foil with acidic foods.
Does foil damage the non-stick coating?
Not by itself, but sharp edges and scraping with utensils can scratch the coating. Lay foil gently and lift it out rather than scraping.
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General information only. Check product labels and manufacturer instructions before you start.
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