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3 Ways to Change Aspect Ratio in Premiere Pro

By Cecilia Hwung | Last Update:

Don't know how to change the aspect ratio in Premiere Pro? What to do if you have already started editing and find out the video is not in the desired aspect ratio as you wish? Maybe you want a 16:9 video and suddenly discovered that your video is 4:3 resolution. Or maybe you want to create a 1:1 square video for Instagram by changing the aspect ratio settings via sequence settings in Premiere.

Change Aspect Ratio in Premiere Pro for a New Sequence

In fact, the right workflow is to determine what aspect ratio you are going to use in the very beginning. With that answer in mind, you shall shoot in that aspect ratio, and set the corresponding aspect ratio in sequence settings before editing.

Follow these steps to set aspect ratio in Premiere Pro via Sequence Settings:

Step 1. Launch Premiere Pro and open your existing project (or create a new project).

  • Open up Premiere Pro and stay in the Start page.
  • Click on the "New Project" to create something new with your own settings.
Create New Project in Adobe Premiere

Step 2. Press Ctrl + N to create a new sequence (or go to Files > New > Sequence).

Step 3. Set sequence settings. The Frame size is the dimension of the video you are going to make. Once it's settled, you will see the aspect ratio right besides the box.

change aspect ratio in sequence settings

For instance, if the frame size is set at 1920 horizontal 1080 vertical, then the aspect ratio is 16:9. If you are going to make a square video, the number of pixels horizontally shall equals that vertically. Say, 1080x1080, 760x760, etc.

Editing Tips:

It's difficult for beginners to learn all those big concepts or to ensure that sequence settings match their source video. In that case, you can import the source video into resources bin, and drag it to timeline. Then Premiere will ask if you want the sequence settings to match your source video.

Step 4. Press Ctrl+ I to import a video (or go to File > import…)

import video

Note: though you can directly drag and drop a video into the resource bin, or even directly drag it to the timeline, it is a good habit to import video the way step 4 does.

Step 5. Drag and drop your clip into the timeline.

If there is a mismatch, then you shall see the following dialog box.

clip mismatch warning

Step 6. Click change sequence settings.

By so doing, parameters such as timebase (Adobe's way of saying FPS), fields will match your video.

Step 7. Check what the current sequence settings are in Menu: Sequence > Sequence settings.

Step 8. Now that all the other settings match the source video, it's your call to change aspect ratio or leave it as it is.

The actions to take are case-specific, and largely depend on how you decide to reconcile the mismatch between source clips and the output video dimension you require.

Change Aspect Ratio in Premiere Pro for an Existing Sequence

"But what if I just notice the aspect ratio is wrong? How to change the aspect ratio of an existing sequence in Premiere Pro?"

There are three methods to convert a portrait video to landscape in Premiere.

  1. Crop the portrait video, and obviously, you will lose many interesting scenes because the top and bottom part of the video are being cropped.
  2. Pillar boxing the source video: this will add black bars on both sides of the vertical video.
  3. A more popular way of pillar boxing: instead of adding black bars, a blurred background will be added, with the same content of the video.

To better illustrate the steps, we use cases below.

Method 1: Change Aspect Ratio by Cropping (Pan and Scan)

Step 1. Click sequence settings from the menu.

Step 2. Change 1080x1920 to 1920x1080.

Step 3. Click on the clip, and you shall see the blue box with pointers. Drag it to enlarge image to fill in the screen.

change aspect ratio by upscaling

Since the top and bottom part of the video are cropped, you might want to add key frames and motion effects to pan the video to include more details of the scene.

Above all, this strategy is not recommended, unless what is being cropped won't affect how the video delivers its message.

Method 2: Change Aspect Ratio by Adding Black Bars

Step 1. Click sequence settings from the menu.

Step 2. Change 1080x1920 to 1920x1080.

Step 3. Click on the footage, and drag the blue pointers to resize the video.

change aspect ratio with pillar boxing

Though you can successfully change aspect ratio from 9:16 to 16:9, it is not practical in daily life. Though 4:3 to 16:9 works the same way, with less area of black bars, it is still not desirable. Our recommendation remains the same: think carefully and set correct aspect ratio before shooting the video.

Method 3: Change Aspect Ratio by Adding an Adjustment Layer

Step 1. Change sequence settings to 1920x1080.

Step 2. Drag your clip to video track 2.

Step 3. Copying your clip by pressing Alt (Option on Mac) and drag your clip to track 3.

add blur effect to change aspect ratio

Step 4. Click video clip on the first track, and blur the video clip.

change aspect ratio by scaling down and blurring

Bonus Tips: How to Quickly Change Aspect Ratio

For video editing beginners or occasional users, it would be an overkill to launch large programs to change aspect ratio. There are many lightweight video processing tools on the market to fulfill your need. VideoProc Converter is a handy and visualized video-processing software by which you can set aspect ratio with one mere click.

VideoProc Converter - Crop videos or change aspect ratio easily

  • Built-in Crop feature to remove unwanted edges.
  • Full list of aspect ratio options: 16:9, 16:10, 1:1, 4:3, 4:5, 2:1, 2:3, etc.
  • One click to make a horizontal video to vertical, and vice versa.
  • Convert video formats, transcode, change resolutions, etc.
  • Editing features: compress, cut, crop, merge, stabilize and more.

Step 1. Free download VideoProc Converter.

Step 2. Load the original video.

  • Open VideoProc Converter > click the first button "Video" to enter into Video Processing panel.
  • Click on the "+Video" button to add the original video from the local drive.

Step 3. Modify the settings.

  • Choose the target format in the bottom toolbar > Click Browse to select the save path > Click Crop button

Step 4. Aspect ratio change in VideoProc Converter.

In the Crop editing page, first check the box to Enable Crop, and there're two ways for you to change aspect ratio:

Enable Crop in VideoProc
  • Method 1: Mere one click - click Preset arrow to choose the common aspect ratio, such as 16:9, 4:3 and 1:1 (square video). That function is not supported in Premiere Pro and makes cropping easy especially for beginner-level users.
  • Method 2: Crop the image from the left, top, right, bottom by adjusting position numbers. (Similar to percentage adjustment in Premiere Pro)
Change Position of Video - VideoProc

Step 5. Click Done and export the target video.

Types of Different Aspect Ratios

An aspect ratio specifies the ratio of width to height. It's the aspect ratio that determines the shape of your video - square, rectangle, vertical, widescreen, full screen, etc.

Different video recording standards use different aspect ratios. For example, people usually use a 16:9 frame aspect ratio for YouTube and a 9:16 aspect ratio for TikTok and other mobile videos. It is essential for your final delivery.

Commonly used aspect ratios are:

  • Fullscreen (4:3): used on television before widescreen was introduced.
  • Widescreen (16:9): the most commonly used aspect ratio for online videos, documentaries, and films.
  • Anamorphic (2.40:1): wide widescreen often used in movies for a cinematic feel.
  • Square (1:1): commonly used on Instagram and other social media.
  • Vertical (9:16): used for videos recorded on your phone and mobile social media like Tiktok and YouTube short.

Sum Up

A wrong aspect ratio would result in video distortion or unsightly black bars — if you are not adding it intentionally to create wide screen cinematic look — but the problem is, too often than not, one only notice the problem after editing is finished. Say, you already added titles, stickers, and everything. Later you find out the video is edited in 4:3, while popular YouTube video uploading setting is 16:9. If you go ahead and upload it anyway, there will be ugly black bars on the left and right sides.

Using VideoProc Converter, you can quickly change the aspect ratio of a video without a learning curve. Besides cropping a video and changing the aspect ratio, this software also helps you to fix Premiere won't support MKV errors, you can use it to rough cut video, convert video to editing friendly video format without quality loss.

About The Author

Cecilia Hwung is the marketing manager of Digiarty Software and the editor-in-chief of VideoProc team. She pursues common progress with her team and expects to share more creative content and useful information to readers. She has strong interest in copywriting and rich experience in video editing tips.

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VideoProc is a primary branch of Digiarty Software that is a leading multimedia software company founded in 2006. It endeavors to provide easier hardware-accelerated video audio editing and conversion solutions. The installed base of the VideoProc product has reached 4.6 million units from 180 countries since its release 3 years ago.

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