3 Ways to Compress H.264 Video File Size without Losing Quality

When it comes to high-quality video recording and distribution, H.264 is one of the widely used file formats. H.264 is also termed MPEG-4 Part 10 or Advanced Video Coding (MPEG-4 AVC) and the format is supported by an array of devices for 4K recording like GoPro HERO, DJI Phantom, iPhone, and others.

Since videos in H.264 format is recorded in high quality the size is quite large, this may lead to issues regarding the storage and the sharing of the files. To overcome these and other similar issues with H.264 files, compression works as the best solution. Though there is no dearth of video compression tools in the market, the choice has to be made wisely so that you can compress video without losing quality.

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Part 1. 3 Ways to Compress H.264 Video File Size without Losing Quality

The best tool that we recommend to compress H.264 video files without losing quality is Wondershare UniConverter. This reliable software can reduce your H.264 as well as other files in lossless quality and with added features like batch processing, fast compression, preview option, and more.

Using Wondershare UniConverter, H.264 videos can be compressed in different ways like editing the files, changing parameters, reducing size, and more. Check out these compression methods below to make video size smaller.

Method 1. Compress H.264 videos by changing H.264 codec to HEVC

HEVC format delivers the same quality of the videos as H.264 while reducing its size to half. Thus, one of the simplest ways to compress H.264 files is by converting them to HEVC and for this video converter function of Wondershare UniConverter can be used.

Steps for H.264 compression by converting H.264 to HEVC using Wondershare UniConverter

Step 1 Add H.264 files to Wondershare Converter

Download, install and run the Wondershare software on your PC, and from the main interface choose the Converter tab. Click on the Add Files icon or the + sign to browse and add the videos.

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Step 2 Choose HEVC as the target format

After the files are added, expand the drop-down menu at the Output Format section at the bottom-left corner. Choose HEVC from the Video tab and also choose the desired resolution.

Step 3 Convert H.264 to HEVC

At the File Location tab, you can choose the desktop folder to save the converted files. Click on Start All button to finally start the video conversion. On the interface, the converted files can be checked from the Finished tab.

change h264 codec to hevc
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Method 2. Shrink 4K AVC videos by lowering the resolution

The H.264 videos are generally recorded in high 4K resolution making the size of the files large. Watching these videos on general TV and other screens with reduced resolution will not have any change in the visual experience. Thus, by lowering the resolution of your videos, the file size can be decreased considerably. To get this task done in a hassle-free manner Wondershare UniConverter works as an excellent choice.

Steps to lower resolution using Wondershare UniConverter for H264 video compression

Step 1. Add video to Wondershare UniConverter

Choose the Converter option from the main interface of the Wondrtshare software. Add the video file by clicking on the + sign or Add Files button. Multiple files for batch processing can be added.

Step 2. Choose the resolution

After the file is added, click on the Settings button and a pop-up window will open. Here choose a lower resolution from the drop-down list at the Resolution option.

Note: To change the resolution of multiple files at the same time, click on the settings icon next to the Output Format section on the bottom-left corner.

Step 3. Start processing

The file Location tab will let you choose the destination folder. Finally, click on the Start All button to proceed with the processing.

lower resolution to shrink videos

Method 3. Reduce H.264 video size by trimming and cropping

If your H.264 files have unnecessary parts and portions, deleting them will result in size reduction. Using the trimming and cropping function of Wondershare UniConverter you can easily get rid of the unnecessary video parts and thus reduce its size without any quality loss.

Steps for trimming and cropping using Wondershare UniConverter

Step 1. Choose Wondershare Video Editor

Launch the Wondershare UniConverter software and from the main interface choose Video Editor from the left-side options.

Step 2. Trim and Crop Video

Trim: Click on the Trim button and browse for H.264 video to be edited. The added file opens in a trimming window. Move the slider at the video thumbnail ribbon under the video to select the video part. Click on the scissors icon that will separate the selected part and mark it as Segment 1. Similarly, multiple segments can be created.

Next, choose the portions that are not desired, click on the Delete icon. Multiple segments can be deleted in this manner. Click the checkbox next to Merge into one file to combine all the remaining parts as a single video. Click on OK to confirm the settings.

Crop: Click on the Crop button and browse to add the desired H.264 video. The file will open in a crop setting window. Enter the desired height and the width of the video to crop its size. Select the aspect ratio as desired. Click on OK to confirm.

reduce video size by trim crop

Step 3. Star processing

When cropping and trimming are done, select the destination folder at the File Location tab and then finally tap on the Start All button.

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Part 2. FAQs on How to Compress H.264 Videos

1. How much does H.264 codec compress?

If we compare H.264 with MPEG-2, the former can be compressed to a level where the same video quality can be maintained while reducing the storage space and bandwidth to half. In comparison to H.264 codec, the ratio of compression of HEVC is almost double and thus the codec is preferred by a lot of platforms and devices. It is due to the high compression ratio, H.264 4K files are compressed by converting the codec from H.264 to H.265 which is HEVC.

2. Is H.264 a highly compressed codec?

Yes, H264 is popular because of its high compression ratio while maintaining video quality.

3. How can I reduce H.264 video file size with Ffmpeg?

Using FFmpeg H,264 files can be reduced and compressed in several ways, like by converting H.264 codec to H.265, reducing the bit rate, and more. If you are well versed with the one-line commands of FFmpeg, H.264 file compression is quick and fast.

Try UniConverter for Free Now - bulk compress videos without losing quality!

Over 3,591,664 people have downloaded it to try the advanced features.


Compressing H.264 files are quick and hassle-free using Wondershare UniConverter. The interface is simple and the files can be compressed in various different ways. Install the software on your Windows and Mac and start enjoying the wide range of software features.

* Some of the above codec formats may need to be supported by system.

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