VideoProc Converter

Compress WebM Video – Up to 90% Smaller

  • Reduce WebM file size, no watermark, batch task, mainatain Alpha channel
  • Adjust bitrate, GOP length, quality mode, Max Quality
  • 47x faster compression speed with Hardware Acceleration
  • All-in-one: edit, compress, convert, record, download video
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Top 5 Ways to Compress WebM File Online and Free

By Cecilia Hwung | Last Update:

Primarily intended to offer a royalty-free alternative to use in the HTML5 video and the HTML5 audio elements, WebM features a convincing web performance by enabling real-time, high-quality video playback on numerous devices and browsers. Though crafted with a higher compression ratio than MP4 or other media formats to better deliver content on the internet, the request to compress WebM file can still be found if the video size is too large. Thus, here in this post, we have collected the top 5 WebM compressors that you can leverage effortlessly to reduce WebM file size without perceivable quality loss.

compress webm

Best Way to Compress WebM File (Maximum Quality Reserved)

Equipped with a Max-Quality Compression Engine, VideoProc Converter enables you to free-compress WebM video with the maximum image quality reserved. Armed with a high-tech coding algorithm, the WebM compressor features all regular and advanced compression techniques, including increasing GOP, lowering bitrate and frame rate, downscaling the resolution, converting to a more aggressive codec, etc. The intuitive design can further streamline the WebM compression process, and within a few simple clicks, you can shrink your WebM file to over 90% of the original size.

VideoProc Converter – Best WebM Compressor to Free Reduce WebM File Size

  • 6 solutions to batch shrink WebM video files for all occasions with estimated output size.
  • The max-quality compression engine to retain the highest quality of your videos.
  • 47x real-time faster compression thanks to the Full GPU acceleration.
  • One-stop video solutions for both macOS and Windows: convert, resize, fix, edit, download…


Step 1. Free download VideoProc Converter, launch it, and import your WebM file.

VideoProc Converter Interface

Step 2. Compress the WebM file to a smaller size.

It is preferred to reduce WebM file by enlarging its GOP length, which can greatly reduce the video file size while maintaining the original image quality as much as possible. And to that end, go to the blue-gear Option icon > in the Format panel, find GOP in the Video Codec Options section, and increase the value. In addition, you can decrease the WebM file size by:

  • Lower the target bitrate, frame rate, resolution, etc.
  • Convert to a more aggressive codec.
  • Move the quality slider to the far right to prevent large quality degrading.
Compress WebM VideoProc

Step 3. Click Done after applying the adjustment and go back to the interface; Enable the Hardware Acceleration Engine, and hit Run to export the compressed WebM file.

How to Compress WebM File Online

For those who are reluctant to install a third-party WebM compressor while seek after a quick and easy solution to compress WebM files, you can check with the online WebM compressor. And among sundry video compressors online, we have singled out the following top four pieces in terms of WebM compress ratio, output quality, and performance.

1. Media. io

Running as an all-in-one online video solution, enables you to batch compress 25 WebM files (less than 500MB/each) for free by customizing the video resolution, size, bitrate, and output format as needed to shrink the video size. WebM Compressor

Step 1. Navigate to the Video Compressor website, and click Choose Files to upload your WebM file(s) from your computer or network disk.

Step 2. Compress WebM file size online. Tap on the gear icon, in which you can either directly shrink the video to a certain size or adjust video resolution, output format, and bitrate to customize your WebM compression output.

Step 3. Hit the Compress button to reduce the WebM file size.

2. XConvert

XConvert is another versatile online WebM compressor that you can opt for. Largely characterized by a fast compressing speed, the tool can easily reduce your WebM file on Windows, Linux, Mac, etc. And all you need is to upload the video file and choose your desired compression method by either file size percentage, preset, variable bitrate, or constant bitrate, and then you can leave the rest to the program.

XConvert WebM Compressor

Step 1. Launch XConvert video compressor on your browser.

Step 2. Select or drag and drop your WebM file to the program, adjust the Output Extension, and Video Codec, choose the desired compression method and set the wished video quality. Then click on the Compress button to shrink your WebM file.

3. VideoSmaller

VideoSmaller is a free video service that can reduce WebM video file size (less than 500MB) to over 70% online for both PC and mobile users. The platform comes with a low compression level mode to ensure the best quality output. Besides, you can also rescale the video width from the given options, and remove the audio to further compress the WebM file if needed.

VideoSmaller WebM Compressor

Step 1. Go to and click on Browse to locate and upload the WebM file that you wish to compress.

Step 2. Choose between settings to scale your video width, mute audio if needed, and click on the Upload Video button to export the compressed WebM file. The compression process might take some time depending on the video length.


Designed as an all-around website to compress files of all kinds, can free compress 5 WebM files (less than 200MB/each) at a time. To reduce WebM file via, you are allowed to work on the overall quality directly or customize specific video parameters like size, bitrate, frame rate, video aspect, etc. WebM Compressor

Step 1. Head over to

Step 2. Come down to the Compression Settings, and choose the desired compression options of either 'Change Overall Video Quality' to set the quality output value, or 'Change Specific Video Parameters' to set the video size, bitrate, frame rate, aspect, etc. You can also choose to remove the audio tracks to further reduce the WebM output size.

Step 3. Upload your WebM file(s), and after loading your file, the compression will automatically begin.

Step 4. When the process is complete, download the compressed WebM file as ZIP, or you can save it to the cloud storage.


Though online compression can be handy, it comes at a cost on other sides. For instance, the free trial would usually impose a maximum upload limit, and a subscription fee is required if exceeding the cap; besides, the annoying ads spread all over, let alone the privacy and security. Thus if you are seeking a thorough and limit-free solution to compress WebM file, check out VideoProc Converter – the best WebM compressor for all desktop users.


What is a WebM file?

WebM is an open and royalty-free media file format designed for web-based streaming. It consists of video streams compressed with the VP8 or VP9 video codecs and audio streams compressed with the Vorbis and Opus audio codecs.

WebM vs. MP4 file: what is the difference?

  • File size and quality: the compression ratio of WebM is generally higher than MP4, thus leading to more original quality loss than the latter. And the file size of WebM is smaller than MP4.
  • Compatibility and application: WebM is crafted for online streaming, while MP4 performs better with media devices. Lack of prevalence gives the format less compatibility with the common devices than the latter. Thus WebM is much preferred if you wish to upload the video to YouTube, while MP4 is much more decent if you are after a higher video quality and compatibility.
  • Codec: WebM, developed by Google, adopts VP8 or VP9, while MP4, developed by ISO, uses H.265, H.264, and AVC.

About The Author

Cecilia Hwung is the marketing manager of Digiarty Software and the editor-in-chief of the VideoProc team. She pursues common progress with her team and expects to share creative content and useful information with readers. She has a strong interest in copywriting and rich experience in editing tips.

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VideoProc is a primary branch of Digiarty Software that is a leading multimedia software company founded in 2006. It endeavors to provide easier hardware-accelerated video audio editing and conversion solutions. The installed base of the VideoProc product has reached 4.6 million units from 180 countries since its release 5 years ago.

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