Video resolution tells you how many pixels wide and tall the video is

A video's resolution is the number of horizontal pixels by vertical pixels that make up each frame. When you see "1920×1080" or "4K", those numbers describe the dimensions of the image. The first number is the width (how many pixels across), and the second is the height (how many pixels down). A 1920×1080 video has 1920 pixels going left to right and 1080 pixels going top to bottom.

Higher resolution means more detail and a sharper picture, but it also means the file takes up more storage space and requires more processing power to play. A 4K video (usually 3840×2160) will look noticeably clearer on a large screen than a 720p video (1280×720), but a 4K file might be five to ten times larger on your hard drive.

You do not need special software to find out what resolution your video is. Your operating system can show you this information in seconds, and there are free online tools that work in your browser if you prefer not to read anything.

Key Takeaways

  • Resolution is written as two numbers separated by an × — the width in pixels first, then the height, like 1920×1080.
  • On Windows, right-click the video file, select Properties, then Details to see the resolution listed as "Frame width" and "Frame height".
  • On Mac, select the video file and press Command+I to open the Info window, where resolution appears under Video section details.
  • Free online tools like MediaInfo Online let you upload a video to check its resolution without installing software.
  • Common resolutions are 720p (1280×720), 1080p (1920×1080), and 4K (3840×2160), though videos can be any dimension.

Finding resolution on Windows

Right-click the video file and select Properties from the menu that appears. A window will open showing basic information about the file. Click the Details tab at the top of that window.

Scroll down through the list until you see Frame width and Frame height. These two numbers are your resolution. If the frame width is 1920 and the frame height is 1080, your video is 1920×1080 (often called 1080p). Write them down or take a screenshot if you need to reference them later.

If the Details tab does not show video information, your Windows version may not support that view. In that case, use the free MediaInfo tool described below instead.

Finding resolution on Mac

Click once on the video file to select it. Then press Command+I on your keyboard. A window titled "Info" will open showing details about the file.

Look for a section labeled Video or Movie. Under that section, you will see a line that says Dimensions or shows the width and height directly. The format will be something like "1920 x 1080" or "3840 x 2160". That is your resolution.

If you do not see video information in the Info window, the file may be corrupted or your Mac does not recognize it as a video. Try opening the file in QuickTime Player instead — press Command+I while the video is playing, and QuickTime will display the resolution in the inspector panel.

Using a free online tool to check resolution

If you do not want to use your operating system's built-in tools, MediaInfo Online is a free website that shows video resolution without requiring you to install anything. Go to mediainfo.online in your web browser.

Click the Select File button and choose your video from your computer. The tool will upload the file and display detailed information about it, including resolution, frame rate, file size, and audio details. The resolution will be listed as "Width" and "Height" or as a single line like "1920 x 1080".

This method works on any device with a web browser — Windows, Mac, Linux, or even a phone. The downside is that you are uploading your video file to a website, so do not use this method if the video contains private or sensitive content.

Understanding common resolution names

Video resolution often gets a shorthand name based on the vertical pixel count. 720p means the height is 720 pixels (the width is usually 1280). 1080p means 1080 pixels tall (width 1920). 4K is a marketing term for roughly 3840×2160, though some 4K videos are slightly different dimensions.

The "p" stands for "progressive", which refers to how the image is drawn on screen — it is a technical detail you do not need to worry about. The important thing is that the number tells you roughly how sharp the video will be. A 1080p video will look sharper than a 720p video on the same screen, and a 4K video will look sharper still.

You might also see resolution written as "1920p" or other numbers that do not match the common names. That is fine — the video is still valid, just not one of the standard sizes. Websites like YouTube and streaming services accept videos at many different resolutions, not just the common ones.

Why resolution matters for your situation

If you are uploading a video to a website, that site usually tells you what resolution it accepts or recommends. YouTube, for example, accepts videos up to 4K but recommends 1080p for most creators because the file size is smaller and uploads faster. If you are storing videos on your phone or computer, knowing the resolution helps you understand how much space the file will take up.

If you are watching a video and it looks blurry or pixelated, checking the resolution can tell you whether the problem is the video itself or your playback settings. A 720p video will never look as sharp as a 1080p video, no matter how good your screen is. Conversely, if a video is 1080p but looks soft, the problem might be your video player settings or your internet connection, not the file.

Frequently Asked Questions

What if my video file does not show resolution information?

The file might be corrupted, or your operating system does not recognize it as a video. Try opening it in a video player like VLC (free on all platforms) — if VLC can play it, the file is probably fine, and you can use MediaInfo Online to check the resolution. If VLC cannot open it, the file may be damaged and cannot be repaired without specialized tools.

Is a higher resolution always better?

Higher resolution means more detail, but it also means larger file sizes and slower uploads. For social media, a 1080p video is usually the best balance — it looks sharp on most screens and does not take forever to upload. For archival or professional work, 4K is worth the extra storage. For web viewing on small screens, 720p is often sufficient.

Can I change a video's resolution after it is recorded?

You can scale a video to a different resolution using video editing software, but you cannot add detail that was not captured. Scaling a 720p video up to 1080p will make it larger but not sharper. Scaling down (like 4K to 1080p) works better and reduces file size.

Why do some videos show resolution like 1280×720 instead of 720p?

They are the same thing — 1280×720 is the exact pixel count, and 720p is the shorthand name based on the height. Different tools display it different ways. Both refer to the same resolution.

Does resolution affect how fast a video plays?

Resolution does not affect playback speed, but it affects how much data your device has to process. A 4K video requires more computing power to play smoothly than a 720p video. On older devices or slow internet connections, a high-resolution video might stutter or buffer, while a lower-resolution version plays without interruption.