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How to Reduce and Compress MP4 File for Smaller Size with MP4 Compressor

People are itching to save all movies and videos in MP4 format on their hard drives. But you can't have your cake and eat it too. The large amount of MP4 videos take up a whole lot space, though files in MP4 format are playable on almost all media players. No wonder many people ask for solutions to reduce MP4 file size in order to release their hard disc space or fit on the memory card for their mobile devices. If you happen to be the one sweating over to find a reliable solution to compress MP4 video file, the following guide will be helpful, showing you everything about how to reduce file size of MP4 without lossing quality.

Three Major Reasons to Compress MP4 File Size

Besides the abovementioned reason of freeing up your space by compressing MP4 videos, there're other 3 reasons why people are urgent to compress MP4 video files.
1. In spite MP4 is regarded as one of the best YouTube upload formats, the file with larger size usually gives rise to YouTube upload failure, not to mention slow upload speed. So you need to shrink MP4 down so as to share it on YouTube or Facebook faster and successfully.
2. E-mailing an MP4 video clip with smaller size to friends is much easier and faster than a larger one.
3. For a successful playback of a high-resolution video on a small-screen phone, you need to reduce and compress MP4 video for smaller size to fit the screen, see with the help of a professional MP4 video compressor.

Fast Compress Reduce MP4 File Size - No Quality Loss

Compress MP4 files to smaller-sized video formats for faster web upload and emailing, and save storage space and play on portable devices.
* Compress MP4 in batches at fast speed (1 min for a 520MB 4K MP4 file)
* Compress HD/4k videos to MP4, MOV, WMV, FLV, WMV, etc with smaller size.
* Change codecs, lower resolution, bit rate, frame rate to shrink MP4 file size.
* Directly compress MP4 to iPhone/iPad/Android playable formats/resolutions.
* Compress MP4 to web sites, like YouTube, Facebook, Vimeo and more.
* Personalize MP4 video before compression, such as crop/edit/trim/subtitle.

Hot Search: Online video compressor, free video compressor, compress video for email, video compressor for Mac

Top 3 Ways to Reduce & Compress MP4 Video File for Uploading, Emailing, Playing and Space-Saving

Way 1: Reduce Size of MP4 to a Smaller-Sized FLV, WMV

There is a bewildering array of video formats besides MP4 - AVI, WMV, FLV, MOV, MKV, etc for compressing files, - and on top of that, how these formats stack up against each other, especially in terms of providing smaller file size than MP4? Which one is the best format to compress MP4 to? The table below will list the formats with both pros and cons.

Video formats




One  of  the  most  common  formats compressed  with  a  wide  variety of codecs; Compatible with many media players.

It is too large to compress


A  tightly  compressed  format  that  requires  a  minimal  amount  of  storage  space; Have 2x better compression than MPEG-4; Good choice for video email and storage on your hard disk.

Have bad compatibility with non-windows platforms, like iPhone, iPad and other Apple devices.


A suitable format for web video. It's workable to compress MP4 to smaller FLV for web upload.

It's expensive and time consuming to create an FLV content.; Longer wait time to access a web page with Flash.


Open-source; supports menus for the inclusion of audio tracks in different languages;

Not universal across all media players and devices; Usually come with larger file size up to 40GB

From the tablet listed above, you can easily draw a conclusion that WMV and FLV provide relatively small size. If you hope to compress MP4 format, it's advised to convert MP4 to WMV or FLV to reduce MP4 file size using a professional free MP4 video converter.

See also: How to compress video files, resize video for upload, compress AVI, compress MOV, MP4 vs WMV, AVI vs MP4

Way 2: Change Parameter Settings, Incl. Video Resolution, Frame Rate and Bit Rate to Compress MP4 Files

Video resolution: The video resolution is closely bound up with video size and quality. Higher resolution usually results in larger video file size. Changing the original video to a smaller resolution will lead to a smaller file size. For HD MP4 video, as high as 1920*1080P, it's recommended to reduce to 1280X720, 640×480, 640×360, and more resolutions to make MP4 file smaller. Generally, 640×480 is highly recommended as it is suitable for most mobile devices (iPhone, iPad, Android) and fits for many websites (YouTube, Facebook, Vimeo), provided you don't care much about the artifacts of the compressed file.

Bit rate: As for the bit rate, lowering the bit rate will bring about the decrease of the video file size. But please keep in mind the image quality will be bad in case you make the bit rate too low. We suggest you lowering the bit rate 20-30% of the original file.

Frame rate: With regard to frame rate, it has a lot to do with the file size. the lower frame rate, the smaller size you will get, and vice versa. Below is the suggested MP4 compression settings for YouTube as well as Vimeo. You can set it at 23.97fps to lower the file size of MP4 before compression.


MP4 compression settings for YouTube

MP4 compression settings for Vimeo


H.264 (Provide higher video quality for smaller MP4 file sizes)



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

640 pixels wide (SD) or 1280 pixels wide(HD)

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)

Frame rate

The same as the original

24, 25, or 30 FPS as its value about 20 makes no difference.

See also: Best video codec, compress 8K videos, Compress 4K UHD to 1080P

Way 3: Trim Unwanted Part to Downsize MP4 Video File

Generally, trimming unwanted video clips from your big video file is a feasible way to decrease MP4 video file size. And some video editor tools as well as video converters that toast the editing features can realize the task. You can either change the video file into multiple segments or cut off the unwanted clips like commercials, to get MP4 file size compressed.

Feasible Tools to Reduce and Compress MP4 Files without Lossing Quality

Now that you've figured out the ways to compress and reduce MP4 file size, let's step forward to find the best MP4 video size reducer. Without any doubt, it couldn't be better to find one tool integrating the abovementioned MP4 downsizing features. Luckily, MacX Video Converter Pro (or Windows Version) realizes all what you need. It features MP4 video compression, parameter adjusting, excellent video editing and batch MP4 conversion. All you have to do is to load large-sized MP4 video, choose smaller-sized WMV or FLV, change the codecs, lower the bit rate, resolution, frame rate, etc, trim the unwanted parts if you like, and start the conversion.

The compression speed is never an issue with MacX Video Converter Pro. Support Multi-core CPU and hyper-threading technology, it makes full use of CPU, up to 8 cores, to fasten compression speed to a great degree. One thing needs to be mentioned, it is world's first media converter for Mac taking advantages of the breakthrough hardware acceleration Intel Quick Sync Video, thus managing to compress MP4 up to 5x faster than other converters, while sparing the computer resources for other tasks. Plus, the boasting of high quality engine will ensure a lossless quality even if you conduct the MP4 compression to make it smaller using the MP4 resizer. Therefore, you can play it on mobiles without worrying about storage full, upload it to Youtube, email to your friend as fast as possible with crisp image.

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Just follow the steps below, where tutorials about how to reduce and compress MP4 file size with the MP4 compressor is shown to you, if you've already downloaded the MP4 video compressor and got it installed on your computer.

How to Compress MP4 Files for Smaller Size

Step 1: Free download MP4 compressor and open it, load video to be compressed. Since batch conversion is supported, you can add more than one large space-hogging MP4 files to be compressed at a time.
Step 2: Choose the video format as you want, such as WMV or FLV. And place the scroll bar to left for a low-quality but fast MP4 compression;
Note: For a lossless MP4 compression, you can stay MP4 format unchanged, and just directly to change its parameter settings.
Step 3: Trigger off the "Setting" window, where you can adjust the MP4 video parameters like resolution (640x480), frame rate (23.97fps), aspect ratio and bit rate.
Step 4: Go to the "Edit" Window to crop and trim MP4, delete unnecessary contents and black bars, in such a way of reducing MP4 file size with lossless compression.
Step 5: With all the steps finished, you can tap the RUN button to start compressing MP4 video to smaller size. The result shows the original 520MB MP4 file is compressed and reduced at least 40%, with file reduced to 310MB only.

compress MP4 to make it smaller

After the MP4 video compression procedure is finished, you can eventually utilize this MP4 compressor's sister MacX MediaTrans to transfer MP4 videos from Mac to mobile device (iPhone iPad included) without eatting up mobile space when you are on the journey or on the way home. It's also the ideal iPhone manager for you to free up space on iPhone iPad iPod by transferring iOS photos, videos, music and more if you have no extra space for MP4 MOV videos storage, instead of deleting anything you don't want to.

Other Alternatives to Shrink Size of MP4, MOV, AVI, WMV, etc

1. Reduce MP4 video size in Windows: Windows Movie Maker provides a simple way to reduce the file size of any video thanks to its video editing and creating features. You can just import the MP4 video to be resized once you open the Movie maker, put it into the movie maker tineline, open the "Save Movie" wizard and select the desired file size for the finished video file on your computer.

2. Compress MP4 video with iMovie: Apple iMovie is an excellent video editing tool that can easily adjust the file size of a video, be it MP4, MOV, AVI or MKV. You just import your video file into iMovie by clicking and drapping the file's icon into the right panel of the iMovie window, click and drag it again down into the timeline at the bottom of the window, select "Export using QuickTime", click "Options" to choose desirable format, date rate, frame rate, etc, then click "Export" to finish video size reducing.
See also: iMovie supported video formats

3. Compress MP4 Video with Handbrake: Although Handbrake doesn't allow to compress MP4 to files like WMV or FLV wiht smaller size, it does let you adjust parameter settings, including video quality, resolution and bit rate. If you are just wanting to reduce MP4 file size for uploading to YouTube or other web sites, you can just check the Web Optimized box to get the desired result. Check the solution if Handbrake outputs large file size >>

4. Decrease MP4 Video with Free Online Video Compressor: Clipchamp is definitely the free online video compressor champion in its circle. It's simple, fast and versatile, that's why more and more users give it a thumb up. To reduce and compress MP4 files online, you just need 3 simple steps to go: Select files > Select output > Create. I choose a HD MP4 music video of Demi Lovato's Cool for the Summer (53.2MB with duration of 3:47 in 720p) and compress MP4 MV to FLV format. Around 4 mins cost for the whole MP4 compression. I must admit the MP4 compression speed is closely related to my computer hardware configuration and network connection speed. If your hardware and network connection is good enough, the speed will get enhanced greatly.

Side-by-Side Comparison and Test about Detailed Compression Ratio

Below is the table about the detailed compression ratio of the above 5 MP4 compressors.
Computer specifications: macOS Sierra (10.12) or Windows 10 64 bit; 4.0GHz quad-core Intel Core i7; 2TB Fusion Drive; Intel Iris Pro Graphics 6200.
Input video: a 4.30 min MP4 with a resolution of 3846x2160.
File Size: 520 MB


MacX Video Converter Pro

Windows Movie Maker




Supported input formats

Support 370+ codecs, incl. AVCHD, MTS, MKV, TOD, MOD, MP4, FLV, etc.



MKV, AVI, MP4, TS, M2TS, unencrypted DVD-like source.


Supported output formats

MP4, FLV, WMV, MOV, 3GP, MPEG4, H.264, MTS, MKV, and other 180 video/audio formats

MPEG, WMV, H264, MP4, MP3, AVI, MOV and WMA

H.264, MPEG4  



Compressing time

1.1 min

2.1 min

2.2 min

2.42 min

2.52 min

Size after compression






Compression rate






Quality after compression






Ease of use






Profiles for devices

iPhone, iPad, Samsung, Android, PS4, and other 350+ devices.



iPhone, iPad, Apple TV


Profiles for web

YouTube, Facebook, Vimeo




built-in YouTube, Vimeo, Facebook, and Google Drive integrations

Profiles for editing/gaming

iMovie, Final Cut Pro, PS4, PS3, etc





Best MP4 Video Compressor for Windows and Mac

Best software to compress MP4 files on Mac/PC by converting MP4 to smaller-sized WMV, FLV, etc in batch.

• Compress/convert any video: convert compress any video to over 180 video formats and 14 popular audio formats.
• 350+ Preset Profiles for Apple and Android Devices: Compress video files to 350+ portable devices like iPhone 7/6s/Plus, iPad Air 2, iPad Mini 4, etc.
• Video Edit/Parameter Adjust: compressing MP4 to lower resolutions, codecs and bit rates, and editing MP4 files via trimming & cropping.
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