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Home Topics Premiere how to change the aspect ratio of a sequence in Premiere Pro

how to change the aspect ratio of a sequence in Premiere Pro

Jul 28, 2025 am 01:37 AM

There are four ways to adjust the aspect ratio of the sequence in Premiere Pro. 1. Adjust the frame size directly by modifying the sequence settings, such as changing it to 1024x768 (4:3) or 1080x1920 (9:16); 2. Manually adjust the material to the new aspect ratio, use "Set as frame size" or "Scale as frame size", and use the "Motion" function to fine-tune the position and zoom; 3. Create a new blank sequence and set the target aspect ratio preset or custom size, and then drag the original sequence in to avoid compatibility issues; 4. When exporting the media, change the width and height value in the output settings, and check the picture quality optimization option, but this method does not adjust the timeline layout. The key is to understand that aspect ratio is essentially resolution ratio, and you need to pay attention to the problem of picture cropping and composition adaptation.

how to change the aspect ratio of a sequence in Premiere Pro

It is actually not difficult to adjust the aspect ratio of a sequence in Premiere Pro. The key is to understand that the essence of aspect ratio is resolution ratio, so the method to modify it is mainly by adjusting the frame size in the sequence settings. Here are a few practical methods.

how to change the aspect ratio of a sequence in Premiere Pro

1. Modify the frame size in the sequence settings

This is the most direct way. There is no "one-click to switch aspect ratio" button in Premiere Pro, but you can do it by adjusting the frame width and height:

how to change the aspect ratio of a sequence in Premiere Pro
  • After opening the project, right-click the sequence on the timeline and select "Sequence Settings"
  • Find "Frame Size" in the pop-up window, for example, it turned out to be 1920x1080 (16:9)
  • Change the value to the ratio you want, for example:
    • 4:3 → 1024x768 or 800x600
    • 1:1 (square) → 1080x1080
    • 9:16 (vertical screen) → 1080x1920

Note: The video screen may be stretched or cropped after modification. It is recommended to adjust the screen layout in combination with the scaling and positioning of the next part.


2. Adjust the material to adapt to the new aspect ratio

When you change the aspect ratio of the sequence, the original material may not be automatically adapted. Manual adjustment is required at this time:

how to change the aspect ratio of a sequence in Premiere Pro
  • Right-click the video clip in the timeline and select "Set to frame size" or "Scale to frame size"
  • If there are multiple materials, you can select all of them and operate them uniformly
  • Use the Motion feature in the Effect Controls to fine-tune the position and zoom ratio

This method is especially important if your source material is horizontal and you want to output vertical screen content. Remember to check whether the key screen is cut out up, down, left and right.


3. Creating a new sequence is more secure

Sometimes directly modifying the aspect ratio of an existing sequence will lead to some special effects or transition misalignment. The recommended method at this time is:

  • Create a new blank sequence (File > New Item > Sequence)
  • Select the appropriate preset in the "New Sequence" window (such as YouTube vertical screen, Instagram square, etc.)
  • Or customize the frame size and enter the aspect ratio value you need
  • Then drag your original sequence in and automatically match the new aspect ratio

This can avoid some compatibility issues of old sequences, especially when publishing on multiple platforms.


4. Adjust again when output? It's OK

If you just want to see the effects of different aspect ratios, or determine the ratio when you finally export, you can adjust it in the export settings:

  • When exporting media, find Width and Height under Basic Settings in the Export Settings dialog box.
  • Enter the value corresponding to the target aspect ratio
  • At the same time, check "Use the highest rendering quality" and "Hardware accelerated encoding" to ensure picture quality

However, it should be noted that this approach only changes the output resolution and will not really adjust your picture layout on the timeline, and is more suitable for projects that have been adapted.


Basically these are the ways to operate. Although Premiere Pro does not have a special "Switch aspect ratio" button, as long as you master the method of frame size and picture adaptation, it is not troublesome to adjust. The key is to pay attention to whether the display range and composition of the material are appropriate.

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