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WebM for Lazys

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A wrapper around ffmpeg and AviSynth made for converting videos to WebM without having to use the command line, fork of this project.

Important to know:

About WebM

WebM is an open, royalty-free, media file format designed for the web. WebM defines the file container structure, video and audio formats. WebM files consist of video streams compressed with the VP8 or VP9 video codecs and audio streams compressed with the Vorbis or Opus audio codecs. The WebM file structure is based on the Matroska container.

For more information about WebM, see the FAQ.

Benefits of WebM

WebM for Lazys features


Get the last update with just one click.


What can i do?

You can get and edit your video easly with the next options.


Paste the url of the video you want and press enter, the download will start. You will get the best quality.


Disable option in general tab to select manually the format do you want.


To download just a part from a youtube video add @*start-end e.g.*5:35-5:45


Trim precisely the length, with a simple interface. You can do multiple trims if you need. Go to.. the exact frame or time you want to start the trim, also save the current frame to source path.



Crop what is just important for you, you can see in real time the new resolution also you can set the exact size that you want or set an aspect ratio like 16:9, 9:16 and more under Set dimensions. Just move the edges with the mouse or use the keyboard.


Dynamic Crop

Follow an object on the canvas easly. Steps for a correct workflow:

  1. Use trim to define the clip lenght (optional)

  2. Open Crop filter and select Dynamic Crop. When it is actived will be green which means that each movement will be registered dynamicCrop

  3. Define the crop size. Even numbers are required new resolution set dimensions


For this example the edition requires 30 seconds.

Final result

Right side was processed with dynamic crop.

Dynamic Speed

Add specific speed to just a section of video:

  1. Use trim to define the clip lenght

  2. Dynamic filter will be enable
  3. Add points in the frame you want with the desire rate (a final ¯\ _ /¯ shape is recomended)
  4. There is not limit for points


Final result

A specific section is slowdown.



Make grid videos to compare or shared different views. You can choose between horizontal or vertical. It requires that both videos share codecs, dimensions, length. Output file is in same path as video #1. Above you can find an example.



If your video looks dark, you can try with some pre-set filters. Now you can create your own filter using Advanced option, change gamma, contrast and saturation.



Add text, change font, size, position, also set when it start and end.



Rotate your video to any direction with just one click.



Loop function, forward and reverse making an infinite effect.


Use different levels of stabilization for your clip. Left side original, right side processed. Find it in Advanced>Processing.

Merge and Convert

Drag and drop two or more video files inside the application, select what do you want to do. Search for the result in source path.


There is More that you can do

Shortcut keys



Version 3.40.2

Version 3.40.1

Version 3.40.0

Version 3.39.3

Version 3.39.1

Version 3.39.0

Version 3.38.0

Version 3.37.0

Version 3.36.0

Version 3.35.0

Version 3.34.0

Special thanks to this month supporters:

Version 3.33.1

To see more changelog.

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This software is released under the MIT license.