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WebM is a video-audio format for delivering video on HTML 5 websites. It's only for HTML 5 websites to stream videos online and few portable devices and players currently support playing this kind of files. There are occassions that you want to edit the WebM video with iMovie for other uses. However, you will be disappionted because of format incompatibility issue. To fix the problem, you'll need to transcode WebM to a more editing-friendly format for iMovie. Here is the entire process.

To convert WebM to iMovie format on Mac OS X (macOS Mojave included), EaseFab Video Converter for Mac a good choice with high reputation. By running it, there's no need to set the codec by yourself: the Mac program has a optimized preset for iMovie (iMovie '11 included). Besides, it can also convert WebM to all popular video and audio formats like AVI, MP4, MOV, M4V, FLV, MKV, MPG and more. As an easy-to-use Mac app, the program can finish your WebM to iMovie conversions within only 3 steps.

Download the WebM to iMovie Converter free trial:

Note: Free trial limits the output files to 3 minutes.

Step-by-step Guide to Convert WebM videos to iMovie on Mac

Step 1. Add the WebM files

You can directly drag and drop your original WebM HTML 5 videos to the Mac or click "Add Video" button to browse and load the videos.

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Step 2. Choose the optimized preset for iMovie

Select "iMovie" as the output format in the "Editing Software" format list. The program has already optimized the video settings for iMovie. The output videos will keep the original quality of WebM video.

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Step 3. Start to convert WebM to iMovie on Mac OS X

After making all settings, please click the "Convert" button to start converting your WebM files to iMovie compatible files.

After the WebM to iMovie Mac conversion, you can freely use your WebM files on iMovie '08, iMovie '09, iMovie '11, iMovie HD etc.

This Mac WebM Converter app keeps updating to expand your digital enjoyment like support the new released devices like iPhone 6, expand output formats and provides more optimized presets for phones, tablets and so on to simplify the conversions. The program also makes all-out efforts to save your time like speed up the conversion by using the latest decoding and encoding techniques, convert several videos and audios at the same time etc. In addition, the WebM Converter for Mac provides some useful edition functions like cropping, trimming, video adjustment, adding watermark and more.