Make your life much easier.
Preview has been officially reviewed and approved by Instagram. Therefore, it is completely safe to use for your account.
You can:
- Auto-post Instagram Reels, photos, videos, carousels
- Plan your Reels feed
- Plan your main grid
- Test different cover images
- And more.
Do it on your phone or computer .
- How to auto-post Instagram Reels on the phone
- How to auto-post Instagram Reels on desktop
- Important information to auto-post Reels (must read)
- The ideal Instagram Reels dimensions and duration for auto-posting (and appearing in the Reels tab)
- Can you post square or rectangle Reels videos?
- Can you auto-post a Reels with your own cover image from your camera roll?
- Custom cover image trick with auto-post
- How many Reels can you auto-post with Preview?
Let’s start.
How to auto-post Instagram Reels with Preview App on the phone
Here’s how to automatically schedule a Reels with Preview App ( see images below ):
- Press on the Reels tab
- Press + to upload your Reels video
- Drag and drop to change the order of the video in the feed
- Press on the video
- Open the caption
- Prepare your caption / hashtags
- Turn on Schedule Post
- Turn on Auto-post
- Turn on Show in Feed if you want to see your Reels in your main feed
- Click on the Reels tab
- Click +
- Upload your Reels
- Drag and drop to change the order of the video in the feed
- Click on the video
- Click on the Caption button
- Write your caption / hashtags
- Click on Schedule
- Turn on Show in Feed if you want to see your Reels in your main feed
- The ideal Reels dimensions and duration
- What if you want to post a square or rectangle Reels video?
- Can you auto-post with your own custom Reels cover image?
- What if you want to auto-post with a custom cover image?
- How many Reels can you auto-post with Preview App?
- Square Reels: 1080x1080px (1:1 aspect ratio), or
- Portrait Reels: 1080x1350px (4:5 aspect ratio), or
- Landscape Reels: 1080px by 566px (1.91:1 aspect ratio)
- Your followers’ Home Feed
- The Explore Page
- But NOT on the Reels tab
- Open your Insta Story
- Add a background color , photo or video
- Use the Camera Roll sticker to add your video on top of the background
- Save the final design (press on the three dots … and Save)
- Upload it in Preview
- Create a cover image
- Open your Instagram Reels editor
- Add the cover image as the first second of the video, for 1 second (or even less)
- Instagram will use the first second of your video (your custom cover image) as the thumbnail














How to auto-post Instagram Reels with Preview App on Desktop
You can do the same thing on Preview Desktop .
I will show you extra tricks too.
To auto-post Instagram Reels on Desktop with Preview ( see the images below ):














Important information to auto-post Instagram Reels
Want to get the most out of your Reels auto-post?
Let’s talk about:
The ideal Instagram Reels dimensions and duration
Reels can be 3 seconds minimum and 15 minutes maximum.
However, Instagram says that:
Reels that are 3 to 90 seconds and 9:16 aspect ratio are eligible to appear in the Reels tab.
They are also more likely to be selected by the Algorithm to appear on the Reels Explore Page.

Therefore, if you want your Reels to appear in your Reels tab , make sure it is between 3-90 seconds long, and has an aspect ratio of 9:16 (which is 1080×1920 px).
However, if you don’t mind NOT appearing on the Reels tab, you can post a Reels that is longer than 90 seconds, or that has a different aspect ratio / dimension.
For example, you can post a:

These Reels size will make you appear on:
At the moment, we are not sure if these Reels sizes would appear on the Reels Explore Page.
Can you post square or rectangle Reels videos?
As we explained in the previous section, Instagram might not show a square or rectangle Reels in the Reels tab. And the Algorithm might not select your Reels to appear on the Explore or Reels page.
So what can you do?
Preview will have the feature to edit your videos soon. We will share the tutorial soon.
For now, upload your square or rectangle video on a 1080x1920px background. Then save this taller video and upload it in Preview.
One way to do it is by using your Instagram Story editor :
Super quick and easy!








Can you auto-post Reels with your own cover image from your camera roll?
If you are using the auto-post feature , you cannot upload your own cover image from your camera roll.
Why?
Because Instagram does not allow other apps or websites to auto-post with custom cover images from your camera roll yet .
However, if you manually post your Reels from Preview to Instagram, you can upload your own cover image in Preview . This is great if you want to test different cover images.
Good news: If you really want to auto-post with a custom cover image – there’s a trick. See the next section.

Custom cover image trick
What if you really want to use a custom cover image?
Use this trick:
People will not notice. It is a trick many content creators use.








How many Reels can you auto-post with Preview?
As many as you want. There is no limit per day, week or month.
However, Instagram does not recommend auto-posting more than 25 posts a day. Your account could get flagged or blocked.
That’s it!
And have fun auto-posting your Reels!