Resize MP4

Resize MP4 videos easily right in your web browser!
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Resize MP4 video online

Flixier helps you resize MP4 videos online easily and quickly, no downloads and installs required! You can crop videos to fix framing issues or convert them from portrait to landscape and vice versa easily in order to optimize them for mobile and post them as Instagram feed videos, stories or Tik Toks.

Resize MP4

Optimized for all platforms

Flixier offers preset Aspect Ratios and sizes optimized for all social media platforms in order to make resizing your video as easy as possible.

Use custom video resolutions

The options menu lets you enter your own custom video resolutions, allowing you to set the precise resolution of your video.

Compress videos easily

On top of resizing, you can also use Flixier to compress the videos easily and make them easier to send over instant messaging apps like WhatsApp or Messenger.

Generate subtitles and overs

Our cloud-powered technology can be used to generate perfectly synced subtitles in seconds, or create natural sounding text-to-speech voice overs for your videos. 

How to resize an MP4 file:

How to resize an MP4 file:

In order to resize your MP4 file, you first need to log into your Flixier account, and create a new project. Make sure to choose an Aspect Ratio that matches your desired video size. Drag your video over to the library. Alternatively, you can click the Import button to bring your video over from a variety of cloud platforms.


Drag on the edges of your video with the mouse button to resize it and make it fit the canvas you’ve chosen. You can also click the cog wheel in the bottom right corner to enter a custom resolution for your video.


When you’re done resizing your video, click the Export button. Flixier will take a couple of minutes to process your video and then you’ll be able to save it to your computer or publish it online.

Why use Flixier to resize MP4 files:

Resize videos easily

Flixier has an intuitive interface that lets you resize videos quickly and easily, without requiring any previous video editing experience.

Get the job done fast

Our video editor is cloud-powered, meaning that your videos are gonna be processed in a couple of minutes maximum, regardless of how fast the computer you’re using actually is.

Resize MP4 videos anywhere

Flixier runs in your web browser, which means that you don’t need to download or install to your computer and that you can run it on any operating system from Mac to Windows and Linux.

Resize MP4 online free

Flixier comes with a free plan which gives you access to the same features that the paid version offers, allowing you to resize MP4 videos and experience the power of online video editing without paying anything.


I’ve been looking for a solution like Flixier for years. Now that my virtual team and I can edit projects together on the cloud with Flixier, it tripled my company’s video output! Super easy to use and unbelievably quick exports.

Steve Mastroianni -

My main criteria for an editor was that the interface is familiar and most importantly that the renders were in the cloud and super fast. Flixier more than delivered in both. I've now been using it daily to edit Facebook videos for my 1M follower page.

Evgeni Kogan

I'm so relieved I found Flixier. I have a YouTube channel with over 700k subscribers and Flixier allows me to collaborate seamlessly with my team, they can work from any device at any time plus, renders are cloud powered and super super fast on any computer.

Anja Winter, Owner, LearnGermanWithAnja

Frequently asked questions.

Frequently Asked Questions

If you have any further questions, Get in touch with our friendly team
If you have any further questions, Get in touch with our friendly team

How do I make an MP4 file smaller?

How do I make an MP4 file smaller?

If you want to resize an MP4 video, you can do so easily by opening it up in Flixier and modifying the resolution and Aspect Ratio. If you want to reduce the filesize, you can use the Flixier video compressor to make the file smaller with minimal losses in audio and video quality.

How do I resize an MP4 video for free?

How do I resize an MP4 video for free?

You can resize MP4 videos for free by making a Flixier account and using our online video editor to resize it. You can choose from a number of preset video resolutions optimized for any social media platforms or type in your own custom resolution.

Can I resize an MP4 file on Windows or Mac?

Can I resize an MP4 file on Windows or Mac?

You can resize your MP4 files on Windows, Mac, Linux and ChromeOS if you use Flixier! Our online video editor runs in your web browser, making it compatible with any operating system and allowing you to resize MP4 files for free on any platform.

Can I resize an MP4 file on Windows or Mac?

Can I resize an MP4 file on Windows or Mac?

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