compress video with iskysoft
Best Video Compressor - UniConverter
  • Best video shrinker to reduce video size on Mac or Windows PC.
  • Decrease video size by changing video size, resolution, bit rate, quality, etc.
  • Supports batch process.
  • Supports more than 150 video and audio formats, like MP3, MP4, MOV, MKV, WMV, AVI, etc.
  • Toolbox includes: Fix Metadata, GIF Maker, Screen Recorder, Video Compressor, etc.

How to Reduce Video Size on Mac and Windows Online Quickly

by Brian Fisher

Want to reduce video size without losing video quality? It is often a daunting task to search for video size converters. You will end up having several tabs open on your browser comparing the video size converter.

In this article, we have made things simple for you as we give you the best video size converter for Mac and Windows and how to use it. Also, we will show you ways to reduce video size online.

Part 1. How to Reduce Video Size on Mac

The best way to reduce video size without losing quality on Mac or Windows is by using UniConverter. This video size reducer is built with a video compression that allows you to adjust video quality, video bitrate, video size, and video resolution. This option can access when converting the files although you can obtain it through the stand-alone video compressor stored under the Toolbox feature. Moreover, UniConverter has fast compression speeds, and you can compress a batch of huge files from your computer.

Get the Best Tool to Reduce Video Size:

  • Easily reduce video to any size on Mac and Windows.
  • Reduce video size by adjust video resolution, bit rate, quality, and other parameters.
  • Support video in more than 150 formats, including MP4, MOV, AVI, MKV, MPEG, FLV, etc.
  • You can change the output format or keep the same format as needs.
  • Specialize in video conversion without losing quality, at 90X faster speed.
  • Compatible with macOS 10.7 Lion to 10.15 Catalina, and Windows 10/8/7/XP/Vista.

How to Reduce Video Size on Mac using iSkysoft Video Converter Mac

Step 1. Select video compress and add video

Open the installed iSkysoft video compressor on your Mac and click on Toolbox and then select Video Compress option. A new window will pop up, and you can now click on the + button to upload the video from your Mac that you want to reduce size.

Select video compress and add video

Step 2. Adjust video parameters to reduce video file size

Your video will then be uploaded, and you can see the compression settings on the new window. You can manually decrease or increase the size of your video, change the file size, choose a new output format, select resolution and change the video quality. Or just drag the bar to change the settings.

Adjust video parameters to reduce video file size

Step 3. Preview and export the compressed video on Mac

After making the adjustments, click on the Preview button to check the output quality. When you are satisfied with the settings, click on Compress button and the program will decrease video size according to your settings.

Preview and export the compressed video

Part 2: How to Reduce Video Size on Windows using iSkysoft Video Converter Windows

If you are using a Windows PC, you can follow this guide to learn how to reduce video file size without losing quality.

Step 1. Add video to iSkysoft video compressor

Open UniConverter on your Windows computer. On the home window, click on Convert followed by Add Files. Import the videos whose size need to be reduced.

Add video to iSkysoft video compressor

Step 2. Select an output format and adjust the video size

Next, click on the Target menu to change the output settings. Go for the “Video” tab, and you will be able to select a video output format.

After that, you can now click on the compress icon. A drop-down menu will appear which allows you to adjust file size, resolution, quality and bitrate. You can know adjust them according to your needs to reduce video size.

Select an output format and adjust the video size

Step 3. Preview and export the compressed video on Windows

After that, click on the Preview button to check the output quality of your file and then click on the OK button. Lastly, you can now compress your video file by clicking on Convert All button at the lower right on your screen. The program will begin to compress your video. That is how to shrink video file size on Windows using UniConverter for Windows.

Preview and export the compressed video on Windows

Part 3. How to Reduce Video Size Online

Alternatively, you can use video size reducer online to reduce video size online. In this section, we will introduce you to 5 tools to reduce video size online and how quick guide on how to use each online compressor.

1. Clipchamp Utilities

The first site that you can use to reduce video size without quality loss is Clipchamp utilities. Clipchamp utility website allows you to compress unlimited video file size, batch convert and convert your video. To use this platform must sign up using your email or Facebook address.

Step 1. After sign up, click on “Convert My Video” to upload a video file.

Convert My Video

Step 2. The file will be uploaded immediately. You will then choose how you want to customize your video that is either for the web, mobile, Windows or Animation.

customize your video

Step 3. Next, you have to customize the resolution, format, and quality of the video.

customize the resolution

Step 4. After doing so, click on “Start” on the right side of the screen. Clipchamp will reduce video size, and you can download it to your computer or share it online.

start reduce video size

2. Youcompress

Youcompress is a video shrinker that supports video files of different formats like MOV, MP4, and AVI to name a few. You can also compress images and PDF files and even audios. Here is how to use this online video shrinker.

Step 1. Visit Youcompress website on your Mac or Windows computer and then click on “Select File” button to select a video to compress.

Select File

Step 2. After that, click on “Upload File & Compress” button and the program will process your video. Once it is compressed, it will be available for download. If it is a private file, you can delete it from the site by clicking on “Delete file from the server.”

Upload File & Compress


There is also a website that allows you to reduce video size online. This website is easy to use, and its uploads speeds are high. Moreover, the quality of your video is not compromised unless you set it to the low-quality output format. Furthermore, this video size reducer online supports batch compression of files hence making it easier to work with large files. Below is a guide on how to compress videos using on Mac or Windows.

Step 1. Go to website and click on “Add Files” icon to select a video file from your computer. Alternatively, you can drag and drop the file to the program

add video to mediaio

Step 2. After uploading the file, you can then set a resolution, output size, and output format and then click on “Compress” button.

click on Compress button

Step 3. Next, you need to agree with its terms and will compress your video. Once the process is complete, you can then download the file back to your computer.

compress your video


PS2PDF is another video size reducer that is available online for free. With this site, you can compress your video within a click and also convert it to a different output format. Its compression settings involve adjusting video bitrate, quality and content rate factor. Now, let us have a look at how to compress video using PS2PDF.

Step 1. Go to PS2PDF website and click on “Select Files” button to upload a video from your computer.

Go to PS2PDF website

Step 2. When the video has been uploaded, hover to the setting window and then adjust the video output quality. After that, click on “Compress Now,” and the site will compress the video. You can then download it to your computer.

compress the video

5. VideoSmaller

Lastly, you can check the VideoSmaller to resize videos online. It is a free website, and the compressed file will be removed after a few hours. VideoSmaller, video size reducer, supports some video formats that are not more than 500MB. Here is how to use VideoSmaller website to compress videos.

Step 1. Go to VideoSmaller website on your computer and click on “Browse” to upload your video.

Go to VideoSmaller website

Step 2. Next, click on compression quality box and choose a preferred quality and then click on “Upload Video.”

click on compression quality box

Step 3. The video will be compressed within a few minutes. Once it is complete, you will have to download the file to your computer.

download the file to your computer

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Brian Fisher

staff Editor