Which frame becomes the preview?

The first video frame. The PNG shows the picture that plays at the very start of the clip.

Is the preview resized?

Yes. The output is scaled to a maximum width of 640 pixels (height stays proportional), so it is small and loads fast in a browser.

What if my video has no picture?

Audio-only WEBM files can't produce a preview, and the conversion fails with a clear error instead of making a blank image.

Generate a WEBM preview image online

Need a thumbnail or cover image for a WEBM video? This page captures a frame from the clip and saves it as a single PNG preview you can drop into a chat, a CMS, or a design file.

How to make a WEBM preview

Upload a WEBM video up to 80 MB.
Press Convert file.
Download the PNG preview image.

What you get

One PNG, up to 640 pixels wide, showing the first frame of your video. The picture is a flat image — no audio or playback.

When this helps

Adding a thumbnail beside a WEBM in a file list or CMS
Sharing a quick visual of a video without sending the clip itself
Creating cover images for video galleries or email