Free online PNG to WEBM converter

A website or editing workflow that accepts WebM video cannot use a PNG still directly. Converting the image creates a video clip that holds the image for a chosen duration.

What PNG is

PNG is a raster image format commonly used for screenshots, diagrams, interface graphics, and images with transparent areas. Image editors and design tools such as GIMP, Photoshop, and Inkscape can export PNG files; screenshots often use it as well. A PNG file is a still image, not an animation or video.

What WEBM is

WebM is a video container commonly used for web playback, usually with VP8 or VP9 video. It can provide smaller web-ready video files than some older formats, and VP9 WebM can carry transparency, though support for transparent playback varies among players and browsers. Converting one PNG produces a video showing that image for a specified duration; it does not create motion from the image.

How to convert PNG to WEBM

Online on 101convert.com

1. Open the PNG-to-WEBM converter on 101convert.com and upload one or more PNG files. The page shows the per-file size limit.
2. Set the video length before converting.
3. Start the conversion and download the resulting WEBM file or files.

Offline with desktop software

FFmpeg is free and open-source, and runs on Windows, macOS, and Linux. To make a five-second video from one PNG, run:

ffmpeg -loop 1 -framerate 30 -i input.png -t 5 -c:v libvpx-vp9 -pix_fmt yuv420p -an output.webm

Replace input.png with the image filename and change -t 5 to the required duration in seconds. This command encodes a 30-frame-per-second video without audio. The yuv420p pixel format discards PNG transparency for broad playback compatibility.

To retain transparency, use -pix_fmt yuva420p instead, if your FFmpeg build supports VP9 alpha encoding. Transparent WebM playback is not supported consistently, so check the target player or browser.

Quality and compatibility

A still image has no motion to preserve; the chosen duration controls how long it appears, while the video codec controls encoding quality and file size. Standard yuv420p output does not retain transparency. Some video workflows also require even image dimensions for 4:2:0 video, so pad or resize a PNG with odd width or height if the encoder reports a dimension error.