user6396: I want to make 1:1 ratio Instagram videos using Davinci Resolve. But I am unable to find how to change the aspect ratio to 1:1 using Davinci Resolve.

user22035: I would try to make a 1080x1080 (1:1) and import your 1920x1080 footage (I'm assuming) and scale the footage to your liking. You either can use part of the footage (crop to fill 1:1), or fit the whole 1920x1080p video within the 1:1 ratio square (it will show black bars).
edit: look at this video for Davinci Resolve Image Scaling... 
Look into image scaling preset in Project settings / also click here for DaVinci Resolve tutorial.
To change the scale of your video/images in the Edit Page, you'll need to open up the Inspector (top-right corner)

user24389: You can do this by going to File>Project Settings...  Under the Master Settings tab on Timeline resolution choose Custom and change For 1920x1080 processing to For 1080x1080 processing.

6396: <p>I want to make 1:1 ratio Instagram videos using Davinci Resolve. But I am unable to find how to change the aspect ratio to 1:1 using Davinci Resolve.</p>
 22035: <p>I would try to make a 1080x1080 (1:1) and import your 1920x1080 footage (I'm assuming) and scale the footage to your liking. You either can use part of the footage (crop to fill 1:1), or fit the whole 1920x1080p video within the 1:1 ratio square (it will show black bars).</p>

<p>edit: look at this video for Davinci Resolve Image Scaling... </p>

<p><a href="https://youtu.be/gAPrg7jykTg?t=1m48s" rel="nofollow noreferrer">Look into image scaling preset in Project settings / also click here for DaVinci Resolve tutorial.</a></p>

<p>To change the scale of your video/images in the Edit Page, you'll need to open up the Inspector (top-right corner)</p>
 24389: <p>You can do this by going to File>Project Settings...  Under the Master Settings tab on Timeline resolution choose Custom and change For 1920x1080 processing to For 1080x1080 processing.</p>
