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Video compression means to reduce the amount of data on a video. It's normally done by decreasing and removing redunt data from the video. People needs video compression because video files take up a lot of storage space in the hard drive, and large files are burdensome and very heavy to transfer. You want to compress video files so as to release free space, compress video for YouTube, transfer to your device or email to others.

Simplest Way to Compress Large Video Files

iSkysoft iMedia Converter Deluxe, which is very suitable to compress video files to play on portable devices because the optimized presets are built-in the tool.

compressing video files

Key Features of iSkysoft iMedia Converter Deluxe

  • Support compression of most video formats, including MP4, MOV, MKV, MTS/M2TS and many others.
  • Flexible compression settings for you to set container, codec, resolution and bit rate with ease.
  • You're able to personalize your video before compression.
  • The program performs video compression much faster than other software.
  • Perfectly supports Mac OS X 10.6 or later (including El Capitan) and Windows 10/8/7/XP/Vista.

Guide to Resize Videos with iSkysoft iMedia Converter Deluxe

Step 1. Load Your Video Files

You can import videos by accessing "File" -> "Load Media Files", or directly drag and drop files to the video compressing program.

compressing videos mac

Step 2. Start to compress video files

Choose "File" -> "Encode Settings", then Click the "Encode Settings" button when it appears, then you can lower the value of resolution (important), frame rate and/or bit rate. Then click "Create Custom" and estimated the best video file size that meet your needs.

video resizer

Step 3. Save the compressed video files

Click "Convert" to export your vidoes after compression, then you will sucessfully shrink video files to smaller size.


To compress video files with a video compressor, there are 5 options that you can personalize to reduce the size of your video.

Option 1: Simply select a proper output format to reduce the video size such as MP4, FLV, 3GP etc, because they are usually smaller than other files due to high compression rate. You can preview the video size on the main window before conversion. But make sure your recipient can play the video in the selected output format.

Option 2-5: You can set the Codec, Resolution, Frame Rate and Bit Rate to make your file smaller. The settings depend on the size and the quality of the video you want to compress too. Please keep reading to lean basic knowledgements about video compression settings.

To do so, after drag and drop the video into the window of program, click "File" on the top left corner, choose "Encode Settings" to open a dialog to set the parameters.

Be patient in compressing your video files, because large size and high quality video files can take minutes or even hours to be compressed.

Why Choose iSkysoft iMedia Converter Deluxe for Mac/Windows

There're many aspects that you need to consider when choosing the video compression tool that satisfies you most, such as the price, the compression quality and speed, ease of use, etc. The following table tells you why iSkysoft iMedia Converter Deluxe is the best one that you should get to compress videos on Mac.

Supported Formats iSkysoft iMedia Converter Deluxe is able to compress HD videos (mts, m2ts, h.264), standard formats (mp4, mov, avi, mkv, flv, etc) and audio formats (MP3, AIFF, M4A).
Compressing Speed This software compresses videos in an extremely fast speed, while most tools in the market doesn't .
Ease of Use The compression settings is easy and flexible, which meets your most daily use. You can compress your video within 3 easy steps.
Price iMovie, Quick Time Pro and Final Cut Pro are comprehensive and professional video tools. But they're expensive if you only look for a powerful and easy to use video compression tool. iSkysoft Video Converter is much cheaper than them.
Additional Features The additional video editor helps you to personalize videos as your wish
Customer Support iSkysoft offers you 24-hour support that solves any minor problem that you might ecounter

Suggestions for Common Video Compression Settings

Normal Compression:

Normal compression reduces the file size and keeps the video quality as much as possible. There are different ways on how to make video files smaller, and the popular ways include re-encoding with an effective video transcoder and using a file compressor.

Loseless Compression:

The goal of loseless compression is to contain all quality of the original video. However, this is not so useful because it barely decrease the amount of data on a video. And most people want to do a video compression with the goal of reducing the video size.

There is no compression setting that is suitable for all users. The requirement differs from desired output dimensions, computer performance, specific compression artifacts and many other aspects. Here're some suggestions that might help you to make the best video compression settings for you.

  • You're highly recommended to compress your video as H.264 in MOV or MP4 format, because they are usually smaller than other files due to high compression rate.
  • The compressed file size totally depends on the compress bit rate. Normally, the smaller video you want, the lower bit rate. The bit rate also controls the image quality. Please mind that the image will totally be destroyed if the bit rate is too low.
  • Besides,the codec also influences the compression. Mostly you can select H.264 here.
  • In most situations, a ratio of 640 * 480 is sufficient. But it also depends on your need.
  • The frame rate, frame size, or codec of the source image doesn't matter so much on video compression.

Knowing the video format, ratio and bit rate that influences the size of compressed video, it'll be much easier for you to select the best video compression settings.

Recommended Video Compression Settings for Youtube & Vimeo

  Video compression settings for Youtube Video compression settings for Vimeo
H.264 H.264
Frame rate
The same as the original video 24, 25, or 30 FPS
Bit rate

1000 kbps (360p), 2500 kbps (480p), 5000kbps (720p), 8000kbps (1080p), 10Mbps (1440p), 35-35kbps (2160p)

2,000 – 5,000 kbit/s (SD) / 5,000 – 10,000 kbit/s (720p HD) / 10,000 – 20,000 kbit/s (1080p HD)

426x240 (240p), 640x360 (360p), 854x480 (480p), 1280x720 (720p), 1920x1080 (1080p), 2560x1440 (1440p), 3840x2160 (2160P) 640 pixels wide (SD) or 1280 pixels wide (HD)

Tips for Resizing Video for Free

compressing videos mac

There's an easy and free way to compress large videos to small size, on condition that your video is .MOV format and your Mac runs OS X 10.7 or above.

  • Navigate MOV video in Finder.
  • Right-click the video and select "Encode Selected Movie File" in the following menu.
  • Select the resolution that you want to encode the video to. Normally sellecting lower resolution than the original video can resuce the file size.

As a free and easy solution, it only changes the resolution of your MOV video. If you want to make the video smaller, you'll need the help from iSkysoft iMedia Converter Deluxe or iMovie and Final Cut Pro.

Any Product-related questions? Tweet us @iSkysoft to Get Support Directly

Head johnson
I have been working on video editing project and for that purpose I needed to compress so many videos. Here I found an effective way to get those done.
Martin carla
Since many days, I have been searching for this guide on how to compress a large video on Mac. I found some more relevant articles on this site.
Thank you! But how do i trim a video? Does it needs to be re converted?
Brian Fisher
Hi William, you can try below two ways to sync the audio and video: 1,You can trim the video by using the built-in editing tool to sync the audio tracks; 2, Alternatively, you can first edit the audio tracks only to adjust it, and then load it to the video with our video converter to sync them. Please take a try. Any other question, please let us know.
thank you for this knowledge!
Does this video converter adds audio tracks? And if "yes", can i resynchronize the audio with the video? Sorry to ask so much, but i have some videos that must have audio resynch and i've tried to do that with both Adobe Premiere Pro and Sony Vegas, but the video output quality gets a little bad. I even tried to use higher H.264 levels and VBR 2 pass with the same bit rate as the original file (or a little more). Can you help me?

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