Best Window Locks

This sliding lock from Defender Security is a secondary lock that fits up to ⅛ inch thick rails and allows windows to lock into the ventilating position. It is constructed of aluminum and comes in a natural silver finish.

These locks come in a pack of four and are easy to install in just a few seconds. They are best used on metal horizontal sliding windows. To install, simply tighten the thumbscrew with pliers to securely lock windows.

The dimensions are 0.88 x 1 x 0.43 inches and this window lock is created to fit up to ⅛ thick rails. Be sure to take proper measurements of your windows before placing an order to make sure this is the right fit for your home.

This child-proof security lock from Defender Security only unlocks with a key. It has been designed to childproof the windows to secure them, especially at high elevations like the second floor. If you want a window lock that will keep your kids safely inside, this is the right option for you.

It can be used on vertical single and double-hung sliding windows and horizontal sliding windows. It can be installed on windows constructed of aluminum, wood and vinyl sash and frames.

Installation is easy with this lock. The sash lock features a 1 inch deep base, ⅝ of an inch deep keeper with a 2-inch mounting hole with center spacing on both the keeper and cam-action keyed locking latch.

It is made out of heavy-duty diecast Zinc with a white enamel finish. These locks are durable and long-lasting.

This is a non-turning key. When it is inserted, thumbturn and cam are released allowing it to be rotated open or rotated closed. To lock the device in the open or closed position, simply remove the key from the lock. You can rest assured that the keys are not all keyed alike. Each lot contains a limited mix of key numbers, so you can sleep easily at night.

These slider locks from Lion Locks are the most versatile of all our window locks on this list. This comes in a set that includes ten window locks that can be used for your patio door, sliding glass windows, and sliding glass doors.

They are crafted from heavy-duty aluminum that is designed to prevent damage from scratching.

These slider locks will fit along a track that is up to 3/16 inches wide. They will also fit without the rubber on a track that is up to 3/8 inches wide. They include additional gripping power to securely lock the window in a closed or ventilating position.

Lion Locks are very easy to install and do not require any tools. They utilize thumb screws that mount onto the window or sliding door track.

These Maxdot locks are a great solution whether you’re looking to keep burglars out, children in, or both!  These locks can keep the windows partially open or fully closed. This gives the bonus of added security and air circulation simultaneously. They are strong and solid locks that you can depend on for extra peace of mind.

These window locks are easy to install and do not require any additional tools. They apply to track heights more than 0.6 inches and track thickness no greater than 0.63 inches, This does not apply to the middle track of the window, so please check your window track before buying.

Each lock comes equipped with a yellow hex key that keeps the lock in place by key control. They are crafted from an aluminum alloy frame and stainless steel screws that can be reused many times.  If you have heavy windows or doors, you can apply multiple locks to increase safety.

If your main goal with window locks is to babyproof your home, look no further than this option from Toddleroo by the North States. These windows and door wedge locks limit the space that windows and sliding doors can open. Baby proof your home with confidence!

These are wedge window locks that will prevent your little one from opening sliding windows and doors by limiting how far they can open them. These are versatile as they work on double-hung and horizontal sliding windows and doors.

These are super easy to install as they feature an easy hook and loop installation. It requires zero tools, screws, or nails! Plus, with installation this easy there is no damage to your sliding doors or windows. The soft white color is aesthetically pleasing and blends in nicely with most home decor.

This is a window bar that is visible through the window to discourage potential home burglars. It is also child-proof as it has a child-safe locking mechanism that prevents children from opening it. What we love about this is you can mount it at variable heights depending upon your needs. This is also a great option if you have a window A/C unit.

Installation is quick and easy with either screws or tape. This is not a pressure-mounted bar, so you don’t have to worry about it getting loose. The manufacturer has provided detailed installation videos that you can watch to get started.

This window bar comes in a variety of sizes including small, medium, and large. Each size is adjustable. For example, the large bar easily slides from 25.75 inches to 47. 5 inches. Make sure to take proper measurements before placing your order.