Free Online Video Resizer
Choose an output height with the video resizer. Save a smaller or larger MP4, keep the frame proportions and check the resulting dimensions.
How to use the video resizer
- Choose the video and note its original frame height.
- Select the output height. The width is calculated from the original proportions.
- Export and check the dimensions of the saved video.
Output sizes for a 720-pixel height
- 1920 × 1080
- 1280 × 720
- 1440 × 1080
- 960 × 720
- 1080 × 1080
- 720 × 720
These examples assume square pixels. All three outputs have the same height, but their widths differ because the sources have different proportions. Compare both numbers with the receiving system’s requirements. When inspecting older footage that uses non-square pixels, also check the display aspect ratio reported by the player.
Choose a height that fits the screen
The video resizer sets the height of the picture in pixels. A setting of 720p means the saved frame is 720 pixels tall. Its width depends on the shape of your source. A wide recording and a portrait recording given the same setting therefore produce files with different widths. Look up the actual width and height in the original file’s media information before deciding which option matches the requested delivery size.
For a landscape recording with square pixels, multiply the new height by the original width and divide by the original height. A 1920 × 1080 frame reduced to 720 pixels high becomes 1280 × 720. The encoder needs an even width, so a result that falls between two suitable widths can be rounded. Check the downloaded file when a service imposes a limit on both dimensions.
The height options in this video resizer are 360, 480, 720, 1080, 1440 and 2160 pixels. Choose according to the screen area where the video will actually play. If it appears in a small space within a web page, start by checking the dimensions of that space. If a receiving editor has specified an exact frame, verify that the height and the original proportions together can produce it.
Resize a portrait, square or widescreen recording
A portrait recording is taller than it is wide. For a 1080 × 1920 phone recording, choosing 720p in the video resizer sets the long side to 720 pixels. It does not set the short side to 720. If your destination requires precisely 720 × 1280, the needed height would be 1280 pixels, which is outside this page’s list. Pick a supported size only if the destination accepts it.
A square source stays square when scaled. A landscape recording remains landscape, including black bars that were already encoded as part of the image. If two copies show the same movie with different amounts of black space, inspect them in the same player window. Bars that appear and disappear when you change the window shape may be added by the player. Bars visible inside the actual source frame will also be resized.
Changing the shape of a frame involves a separate decision. Filling a square with a widescreen clip means cutting content off the sides, adding empty space above and below, or changing the picture’s proportions. This video resizer scales the existing composition. Use the crop tool first if you need to remove the sides and can decide where faces, slides or captions should remain in the frame.
Check text, faces and detail after scaling
Compare small text at the intended playback size. On a screen recording, open a frame with a menu expanded and read the least prominent entry. Watch the pointer move across the same menu. A still frame can look sharp even when letters shimmer during movement. If the smaller export loses information needed to follow the demonstration, move up one height setting and export again from the original.
Increasing the height makes existing details occupy more pixels. If a face is already out of focus or a label is unreadable in the source, a larger export has no additional recorded detail from which to reconstruct it. Start with the largest available original, especially when you have both a camera recording and a smaller version previously sent through a messaging app.
When you compare two sizes, use the same player and zoom setting. First look at the result in the space where it will be published. Then inspect at actual size to see whether a problem comes from the export or from the player enlarging a small copy. Keep the original for future versions. Repeatedly scaling an already resized export can blur edges that were distinguishable in the original.
Video resizer questions
Can the video resizer make a smaller file for email?
Reducing the number of pixels can reduce the amount of data needed for a viewing copy. Duration, motion, audio and encoding settings also influence the final byte count. If an email service gives you a strict allowance in megabytes, use the compressor to target that limit and measure the saved file before attaching it.
Will resizing correct a sideways recording?
Rotation changes which edge of the picture appears at the top. Resizing changes the dimensions of that picture. If a recording appears sideways in the destination player, correct its orientation first and inspect the saved result. Use the video resizer on the corrected source if you also need a particular height.
Why does the exported clip look different in a presentation?
A slide may enlarge a small video to cover the whole screen or crop it into an existing placeholder. Open the exported file outside the presentation to check its dimensions and composition. If it looks correct there, inspect the slide’s fit, crop and playback settings before resizing the source again.
Can I specify a width and height separately?
The video resizer provides one height selector and calculates a matching width. When both dimensions are mandatory, compare the target aspect ratio with the original. If those shapes differ, decide whether any part of the image may be cropped or whether the unused space should be filled before preparing the final delivery.