Webm is the newly created video format opitimized for the web.The quality and file size are much better comparing to other video formats,such as AVI,FLV,WMV,MOV,etc.. And these are the big two reasons why YouTube adopts webm as its newest standard.Right now you can upload webm video directly to YouTube from computer.
There are couple of ways to convert/create webm video available on the web. In this article ,I will show you the easiest way to convert/create webm video with step by step guide.There are two main seactions included in this article:
1.How to create /convert webm videos with Bigasoft Webm Converter (Both for Windows and Mac user)
2.How to convert popular format video(avi,wmv,flv,mov,etc..) to webm with AnyMP4 Video Converter(Only for Windows user)
Software used: Bigasoft WebM Converter (For Windows, For Mac)
Pros:
1.Fast conversion speed.
2.Support a wider range of video formats.
3.Powerful functioality.You can Edit,Trip,Crop,Set your video before converting.
4.Not noly convert videos to webm videos, also convert webm video to other formats.
Cons:
1.Not totally free, just 30- day free of use.
2.Take some time to learn the advanced function.
Bigasoft WebM Converter is an excellent and professional WebM encoder which can encode and create WebM file and VP8 video for HTML5 video from various video formats including convert to WebM/VP8 from MP4, MOV, AVI, 3GP, FLV, H.264, MKV, WMV, RM, RMVB, VOB, Xvid, DivX, HD, AVCH, MTS, TS, etc. With the WebM video encoder you can convert video to high-definition WebM video, standard-definition (SD) WebM video or lower resolution WebM video (under 640*480 pixels).
Windows version dowload
Mac osx Version dowload
Step1. Download "Bigasoft WebM Converter" for free and install it to your computer.
Step 2. Launch Bigasoft WebM Converter, Click the " Add File " button to import file to this WebM Converter. Or simply drag and drop this file to the main interface of this software. Note: You can add either webm file or non-webm file in this step.
Optional: You can choose multipy files one by one by clicking the "Add File ".After adding your file, you can preview,rename and see the detailed infomation of your added file.

Step 3. In fact, the default output video format is WebM format, if you want to convert video file to webm, just do nothing in this step. If you want to convert webm video file to other video format, click the drop-down button on the right side of the " Profile " button to select Video Format you want as output video format.This converter supports most of video formats currently.
Step 4.
Click the " Start "
button to start the conversion, it will be finished in few minutes.
Optional: Edit for output WebM video.
The ideal WebM encoder also provides advanced functions for you to edit video before converting the video to WebM video format.
" Trim " function is for you to trim wanted video clip by setting the start time and end time.
" Crop " function is for you to cut off the black edges of the original movie video.
" Effect " function is for you to customize video like adding watermark, subtitle, audio track, artistic effects.
" Preference " function is for you to set preferred output video folder, output snapshot folder, image type, after conversion done action, CPU usage etc.
" Settings " function is for you to set output video size, video quality, audio quality, adjust audio volume, and choose audio channel and more.
You can also join several chapters into one by checking " Merge into one file " box.
You can drag and drop the folder where your video files are in to the Android Converter by checking " Copy Folder Structure " box.
You can output the converted video to source folder by checking " Output to Source Folder ".
Buy Windows Version(Only 39.99$)
Buy Mac osx Version(Only39.99 $)
Software used:Free WebM Encoder (For Windows)
Pros:
1. Cheaper price.
2. The user interface is much simple and clear than Bigasoft WebM Converter.
3. Add visual effect to the output video.
Cons:
1. limited video format support ,some kind of video formats (such as RM,RMVB) are not supported by this Webm Encoder
2.The convesion speed is a little slower when comparing to Bigasoft WebM Converter.
AnyMP4 Video Converter is a simple free utility that lets you convert your video files to the new WebM format. The program has an extremely easy-to-use interface. Just add the files you want to convert to the list (you can drag and drop them directly from Windows Explorer) and click the convert button. A variety of video formats can be converted, including AVI, MP4, FLV, WMV, and MOV.
Windows version dowload
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Step 1. Download "AnyMP4 Video Converter" for free and install it to your computer.
Step 2. Launch this WebM Converter, choose the file you want to convert by clicking "Add Video ".
Optional: You can choose multipy videos at one time,by clicking the "Add Folder " button, you can remove the file if you do not want to convert.

Step 3.When you finish adding your files,click "Settings" button at the bottom of the program and choose Webm as the out put fomrat at the end of this drop-down list and Click "Convert " button to start the conversion, it will take few minutes to convert,depneding on the size of your file .

Step 4. After the convesion completed, you can open the file at the "Open folder".
Optional: You can set your own output folder by clicking the "other" option.