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Updated By Cecilia Hwung - Contact Author

Review of Top 3 Online MP4 Compressors Free for File Size Reduction

Summary: The post will review 3 online MP4 compressors for you if you need to compress MP4 video to smaller size online free. It also recommends a software program that can compress, resize, edit, convert, download and record virtually any videos.

MP4 or MPEG-4 Part 14 is a container format for storing audio, video, subtitles, images, and all other media data. It is currently the most popular video format around the globe which supported by all devices including phones, computers, TVs, etc. Even online video streaming sites like YouTube prefer MP4 because of its vast compatibility. That's why you can directly upload your videos to YouTube and many other similar websites without transcoding or serious editing. But from time to time, you need to compress your MP4 video files.

Why Do You Need to Compress an MP4 video?

To save storage: MP4 videos can be shot in resolutions ranging from as low as 144P to 4K UHD. However, you can't just play a 4K UHD MP4 video on a 720p screen. When the format is no different, the resolution factor kicks in here as the major fact impact the file size. You don't need to bother yourself spending large space to store high-resolution MP4 which shows no visible difference when playing on your device. That's the most common reason to compress MP4.

For sharing online: Another fact you should note is that most online video sharing websites also have video size limits beyond which you can't upload a video. For example, YouTube has a 128GB or 12 hours limit on uploading of videos. Though you don't need to bother about this mammoth figure because this limit can't be reached easily, the same thing can't be said for other websites that are not as popular as YouTube. Such websites may always find themselves incapable of processing large videos. That's why it would be a good idea to compress those videos.

Free Download the Best MP4 Compressor to Shrink Your Video

Strapped for time? Click one of the links below to jump straight to your most interested part.

Part 1: Top 3 MP4 Compressors – How to Compress MP4 Online

1. KeepVid

KeepVid provides a dedicated and free way to compress MP4 online. KeepVid is trusted by people around the world and currently, no reports are available about its malicious behavior.

Keepvid Video Compressor
Keepvid Video Compressor


  • Completely free to use without any limits.
  • Can compress MP4 in just three steps while using KeepVid.
  • As per its privacy policy user videos are safe from leaks and not get stored on their servers.
  • Cons:

  • Information about video size limits
  • can't process videos that don't have audio.
  • Safety can't be guaranteed as it is an online tool.
  • Intrusive ads may bug you.
  • 2. Wondershare Online Uniconverter (media.io)

    This online and free MP4 compressor is currently having a better reputation than others. This online service is owned by a trusted brand so it is pretty safe to use. Check out its pros and cons below.

    Wondershare MP4 Compressor
    Wondershare Online Uniconverter


  • Employs only a three-step approach to compress MP4.
  • It is completely free.
  • Provides size-based and resolution-based video compression techniques.
  • Supports resolutions up to 4K.
  • Uploaded video gets deleted within a few hours.
  • Cons:

  • No specific info about video uploading size limits.
  • Only suitable for beginners.
  • Can only process videos up to 200MB in size.
  • 3. OnlineVideoConverter.Com

    OnlineVideoConverter.com is a standalone website that also provides a dedicated video compression service. The good thing about this online MP4 compressor is that it can also process video files from links like HTTP and FTP.



  • Provides size based and quality based MP4 compression.
  • Let's users to manually delete their videos instantly after compression. Though all videos are deleted within 24 hours.
  • Can remove audio from MP4 videos.
  • Can process videos having no audio.
  • Cons:

  • The website is filled with many ad codes. These ads destroy user experience, so use an ad-blocker browser plugin.
  • Limited functionality.
  • Part 2: VideoProc - The Best MP4 Compressor Software

    If you are in a hurry, have a fast internet connection, don't bother about privacy leaks, viruses, and malware then you can go with online MP4 compressor tools. Though the tools we mentioned above are pretty safe, we can't validate their security. That's why we highly recommend VideoProc to you. It is all-in-one audio, video processor, video downloader, editor and recorder software.

    Some of the killer features of VideoProc are as follows:

  • 1. Completely safe from any malware, viruses, or ransomware, and privacy leaks.
  • 2. Provides quality customization options for videos. You can resize videos, change bit-rate, change quality, etc.
  • 3. VideoProc can also compress MP4 videos of very large sizes thanks to its level-3 GPU acceleration which is a hardware-based software performance booster.
  • Customize your Settings
    Customize your Settings

    If you want a reliable and trustworthy solution then don't think further and give VideoProc a chance at least once. You can download this software from the links below.

    Final Thoughts

    You just have learned how to compress MP4 while using the top 3 recommended online tools. But be warned, not all online tools are safe to use. It is hard to say about the malicious behavior of such online tools. So, it is highly recommended that you use such tools with responsibility and before going to any website research about its online reputation. If you don't want to waste your time on these things then blindly go with VideoProc which has all the necessary features that you'll need to compress MP4. VideoProc is safe, powerful, versatile, reliable, small in size, easier to learn, and user-friendly. It is your turn now to explore more of its features by downloading, installing, and using it yourself.

    Free Download VideoProc to Shrink the Size of Your Loved MP4 Videos


    Cecilia Hwung Twitter

    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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