VideoProc Converter AI

One-click to Compress WebM Video – Up to 90% Smaller

  • One-click to compress WebM by over 90%, maintain Alpha channel
  • 7 ways to reduce WebM size: specify the target size directly, transcode, etc.
  • Best quality ever with High Quality Engine and x265 encoding
  • Full-GPU accelerated, 47x faster with 2% CPU usage on average
  • AI-generative video processor: convert, compress, download, AI enhance, etc.
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Top 5 Ways to Compress WebM File Online and Free

By Cecilia Hwung | Last Update:

Summary: How to compress WebM file? Here we have curated the top 5 WebM compressor to reduce WebM file size free on Windows/Mac/online.

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 can still be found when the WebM file size is too large. Thus, here in this post, we have collected the top 5 WebM compressor that you can leverage effortlessly to reduce WebM size free on the PC and online.

compress webm

Best Way to Compress WebM File (Maximum Quality Reserved)

Equipped with a Max-Quality Compression Engine to to ensure the best WebM file quality reserved, VideoProc Converter AI enables you to easily compress WebM video in seconds by entering the target file size or dragging the compression ratio slider. In addition, the WebM compressor offers other 6 regular and advanced WebM compress methods to reduce your WebM file to over 90% of the original size, including increasing GOP, lowering bitrate and frame rate, downscaling the resolution, converting to a more aggressive codec, etc.

VideoProc Converter AI – Best WebM Compressor to Reduce WebM Size

  • 7 solutions to compress WebM file size 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.
  • AI-generative video processor: best AI video upscaling solution, compress, frame interpolation, stabilization, media convert, record, edit, download, and more.


Free Download For Win 7 or later
Free Download For macOS 10.13 or later

Note: The Windows version now supports AI-powered Super Resolution, Frame Interpolation, and Stabilization to enhance video and image quality. These AI features are not yet available in the Mac version but will be coming soon.

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

VideoProc Converter AI Interface

Step 2. Compress your WebM file size.

With the built-in compression toolkit, you can directly specify the output file size or drag the compression ratio slider to reduce the video file size .

Come down to the bottom section, find Toolbox > Compress, enter the target file size, or drag the slider to change the compression ratio to any value between 10% and 100%.

Compress WebM VideoProc


  • To make the WebM video even smaller, you can: 1) Select a lower resolution from the drop-down of "Resolution". 2) Drag the green knobs under the preview window to trim the video length.
  • The actual output WebM file size may be slightly different from the estimate.

On top of the given WebM compression solution here, you can also reduce WebM file size by:

  • Increase the GOP value
  • Lower the target bitrate, frame rate, resolution, etc.
  • Transcode to a more aggressive codec.
  • Adjust the audio.
Compress WebM VideoProc

Step 3. Click Done to confirm the settings and then hit Run to compress WebM.

How to Compress WebM File Online

For those who are reluctant to install a third-party WebM compressor but seek a quick and easy solution to compress WebM video file, you can check the WebM compressor online. And among sundry WebM video compressor online, we have singled out the following top four pieces regarding WebM compress ratio, output quality, and performance.

1. Media. io

Running as an online WebM 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 reduce the video file 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 the fast WebM compression speed, the WebM compressor can easily reduce your WebM file on Windows, Linux, Mac, etc. And all you need is to upload the WebM video file, choose your desired compression method, and 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 online video service that can reduce WebM file size (less than 500MB) to over 70% 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 WebM video 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 WebM 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 AI – the best WebM compressor for all desktop users.

Free Download For Win 7 or later
Free Download For macOS 10.13 or later

Note: The Windows version now supports AI-powered Super Resolution, Frame Interpolation, and Stabilization to enhance video and image quality. These AI features are not yet available in the Mac version but will be coming soon.


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 editor-in-chief of Digiarty VideoProc. With over a decade of experience, she specializes in delivering insightful content on AI trends, video/audio editing, conversion, troubleshooting, and software reviews. Her expertise makes her a trusted ally in enhancing users' digital experiences.

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Digiarty Software, established in 2006, pioneers multimedia innovation with AI-powered and GPU-accelerated solutions. With the mission to "Art Up Your Digital Life", Digiarty provides AI video/image enhancement, editing, conversion, and more solutions. VideoProc under Digiarty has attracted 4.6 million users from 180+ countries.

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