Decorating your yard, front porch, front door and windows is essential because these are the first things that your guests and trick-or-treaters will see. Today’s roundup is dedicated to window décor, which can be easily DIYed in a couple of minutes.
Window Silhouettes
Silhouettes are an easy decoration for any window. They are usually in black color to be well seen in the darkness, can be also glowing to look more spooky. You can buy them or easily make them yourself cutting them of paper or cardboard, that’s very simple! You can create whole haunted scenes or scenes from your favorite scary movies. Witches, black cats, jack-o-lanterns, spiders, ghosts and skeletons are a great idea, just cut them out and attach. Invite your kids to participate and have fun together!

Haunted house-inspired Halloween window silhouettes.

These really spooky silhouette curtains will add to your outdoor Halloween decor.

Silhouettes are great Halloween window decorations and can really jazz up your home for trick or treat night.
Decals And Stickers
Stickers are another cool idea, they may be colorful or black ones, you can make them of self-adhesive paper or buy ready ones. They are easy to attach to the glass and can be easily removed, decals also have two sides, so they will be cool for both inner and outer side.

Bats are easy to make silhouettes but if you make a bunch of them they would look great on any window.

Simple small window decals can be bought anywhere and all you need to do is just to attach them to the windows.

Sweet ghost sticker is right you need if there's no time for crafting or as last minute Halloween decoration.
Other Ideas
Get more creative making various cool things! If you have an opportunity, use an animated projector to show skeletons or other stuff in your windows. Use black cheese cloth and make classy spooky curtains for Halloween. Create fun starring eyes on your window decals or silhouettes, use neon paint or something similar. Fun crasher ghosts figures will appear not only outside but also inside, and you will have a double effect. Place a scary figure or a faux witch by the window and enjoy the impression it produces. Decorate the window with faux spiderweb outside and inside, it’s budget-friendly and easy. Out some plastic spiders and a cool vintage candle holder to create an effect of a haunted house. Get inspired!

Cardboard affixed to window to make it look boarded up and skeleton proped to look like it's trying to get in.