How to convert MPG to WebM
- Click Choose files or drop your MPG video into the box above.
- Keep the default quality, or choose a target size, resolution or frame rate.
- Click Convert and download the WebM when it is ready.
MPG vs WebM
| MPG | WebM | |
|---|---|---|
| Usual codecs | MPEG-1 or MPEG-2 video with MP2 or AC-3 audio | VP8, VP9 or AV1 video with Opus or Vorbis audio |
| Plays on | DVD players, VLC and Windows; large files that phones and websites dislike | Chrome, Firefox, Edge and Android; partial support on iPhone and Mac; not accepted by many editors |
| Best for | DVDs, VCDs and older camcorders | Video embedded in websites and screen recordings |
| Introduced | 1993 by the MPEG group | 2010 by Google |
About MPG and WebM
What is MPG?
MPG files hold MPEG-1 or MPEG-2 video — the technology behind Video CDs and DVDs (VOB files are MPEG-2 too). The quality can be good, but files are several times larger than modern MP4 and phones often cannot play them.
- Plays in DVD players
- Good quality at high bitrates
- Big files
- Weak support on phones and the web
What is WebM?
WebM is an open, royalty-free video format designed for the web. Screen recorders and browsers often save clips as WebM. It is efficient, but many video editors, iPhones, smart TVs and upload forms do not handle it well, so WebM files are frequently converted to MP4.
- Royalty-free and efficient
- Plays in Chrome, Firefox and Edge
- Weak support in editors, TVs and some Apple apps
Why GlideConvert?
- Private by design. Your files are converted on your own device by your browser — they are never uploaded to a server. That keeps them private, avoids upload waits and means there is no queue.
- Fast. Images convert in a fraction of a second; video uses your device’s hardware encoder and is often simply repackaged without re-encoding.
- Free. No sign-up, no watermark. 10 images, 5 audio files or one video at a time — Pro lifts the limits and removes ads.
Frequently asked questions
Will converting MPG to WebM lose quality?
Often not at all. If the MPG file already contains video and audio that WebM supports (H.264 video and AAC audio are the most common), they are copied as-is: no quality loss, and even a large file converts in seconds. Otherwise the video is re-encoded at high quality — choose a quality level or a target file size in the options.
How long does converting MPG to WebM take?
Usually much less than the length of the video: modern browsers encode video with your device’s hardware. MPG needs a universal decoder (FFmpeg compiled to WebAssembly, a one-time ~32 MB download) which is slower — expect roughly real-time speed for HD video.
Which codecs does the WebM use?
VP9 video with Opus audio when your browser can encode them (falling back to VP8), the standard WebM combination supported by Chrome, Firefox, Edge and Android.
Is there a file size limit?
On the free plan each video or audio file can be up to 500 MB and each image up to 100 MB. With Pro the limit is 4 GB per file. Because everything happens on your device, the practical limit for very large files is your device’s memory.
Are my files uploaded to a server?
No. GlideConvert runs entirely in your browser: images are processed with the browser’s built-in codecs and WebAssembly, video and audio with hardware-accelerated WebCodecs (or a WebAssembly build of FFmpeg for older formats). Nothing is sent anywhere — you can even disconnect from the internet once the page has loaded.
Does it work on iPhone, Android, Mac and Windows?
Yes. It works in any up-to-date browser — Chrome, Edge, Safari, Firefox or Samsung Internet — on phones, tablets and computers, with nothing to install. Long or 4K videos convert faster on a computer than on a phone.