MPEG to WebM Converter

MPEG vs WebM — Which One Do You Actually Want?

If you are holding a .mpeg or .mpg file, you are holding an MPEG program stream: the DVD, VCD, and TV-capture-card format from the 1990s. It is a fine archive container and a terrible web container — no browser will decode it in a <video> tag. WebM is the opposite: it is useless as a disc format and it is the format the open web was built around. So the short answer is that you convert to WebM when the file's destination is a web page, and you leave it as MPEG when the destination is a disc, an editing timeline, or a hardware player from the DVD era.

Side-by-side Comparison

When to Stay on MPEG

• You are authoring or re-authoring a DVD or VCD, where MPEG-2 program streams are the required payload.
• The file is a capture-card master and you want to keep the first-generation encode rather than stack a second lossy pass on top of it.
• Your playback target is a DVD player, a PVR, or a hardware decoder from that era — none of which read WebM.
• The material is interlaced and you intend to deinterlace it properly in an editor later; re-encoding first bakes the field artifacts into the new file.

When to Convert to WebM

• The clip is going into a web page and you want it to start playing without a plugin, a download, or a fallback.
• The MPEG-2 bitrate is the problem. MPEG-2 spends bits generously by modern standards, so VP9 usually reaches comparable visual quality at a fraction of the size.
• You want the audio in an open codec — MPEG program-stream audio (MP2/MP3/AC-3) is not valid inside WebM, so it is re-encoded to Opus or Vorbis on the way through.
• You need alpha, which VP8 and VP9 support and MPEG-2 does not.

If the file instead needs to play on phones, smart TVs, and social platforms, H.264 is the safer landing zone — use MPEG to MP4 for that.

How to Convert MPEG to WebM

1. Upload Your MPEG File: Drag and drop, or click "+ Add Files" to pick one or more .mpeg / .mpg files. Batch uploads are supported and every file in the batch uses the same settings.
2. Choose Video Codec and Audio Codec: Video Codec offers VP9 (default), VP8, and AV1. Audio Codec offers Opus (default) and Vorbis — those are the only two audio codecs WebM permits.
3. Set File Compression, Video resolution or Trim: File Compression defaults to Quality Preset at "Very High (Recommended)"; Specific file size, Constant Bitrate, Variable Bitrate, Constant Quality and Constraint Quality are the alternatives. Video resolution keeps the original by default, and Trim takes a start time and a duration.
4. Convert and Download: Click Convert. Files upload over an encrypted connection, are processed on our servers, and are deleted automatically after a few hours — no sign-up, no watermark, never shared.

Picking the Video Codec

The VP8 caveat is worth repeating because the control does not look broken: our VP8 encoder path deliberately does not emit a CRF value, since VP8 has no CRF mode. If you select VP8, set the size with Constant Bitrate, Variable Bitrate, or Specific file size instead.

Frequently Asked Questions

Which codec does the WebM use by default — VP9, VP8 or AV1?

VP9. It is the default video codec for every WebM output here, and it is the right pick for almost everyone: markedly more efficient than VP8 at the same visual quality, with hardware decode common on devices from roughly 2017 onward. AV1 compresses harder still but encodes far more slowly. VP8 exists mainly for legacy decode targets.

Does my MPEG's MP2 or AC-3 audio survive the conversion?

The sound survives; the codec does not. WebM only permits Opus and Vorbis audio, and MPEG program streams carry MP2, MP3, or AC-3 — so the track is decoded and re-encoded into Opus (the default) or Vorbis. It stays in sync and keeps its channel layout, but it is a fresh lossy encode, not a copy of the original stream.

My widescreen DVD rip came out squashed after I resized it — why?

Because DVD-era MPEG-2 stores non-square pixels. A 16:9 NTSC DVD is a 720x480 raster with a pixel aspect ratio that stretches it to roughly 854 wide at playback. Leaving Video resolution on "Keep original" carries that ratio into the WebM intact, but any resize option flattens the pixel aspect to square — so a 480p preset on a 720x480 anamorphic source produces a 3:2 picture instead of 16:9. If you need to resize anamorphic material, use Width x Height and type the display dimensions yourself: 854 x 480 for 16:9 NTSC, 640 x 480 for 4:3 NTSC, 1024 x 576 for 16:9 PAL, or 768 x 576 for 4:3 PAL.

Will converting to WebM remove the interlacing combs in my old capture?

No. There is no deinterlacing filter anywhere in this conversion, so if your MPEG-2 source is field-based, the comb pattern is re-encoded into the WebM exactly as it appears. A WebM cannot signal interlacing the way MPEG-2 can, so the combing simply becomes part of the picture. Deinterlace in a video editor first if that matters, then convert.

Why doesn't the Constant Quality slider change anything when I pick VP8?

Because VP8 has no constant-quality mode. The slider renders for VP8 in the current UI, but the encoder path skips it — in our testing, the same 6-second clip encoded through the VP8 constant-quality path came out byte-for-byte identical (423,402 bytes) at slider position 10 and at position 50. Use Constant Bitrate, Variable Bitrate, or Specific file size on VP8; the CRF sliders only bite on VP9 and AV1.

How much smaller should I expect the WebM to be?

It depends entirely on the source bitrate, but the direction is reliable: MPEG-2 was designed around DVD bitrates of roughly 4-9 Mbps for standard definition, and VP9 reaches similar perceptual quality at a small fraction of that. If you need a specific number rather than a ratio, switch File Compression to Specific file size and type the megabyte target you want.

Do the Preset Resolutions give me an exact width and height?

No — the preset list sets height only, and the width follows from the source raster. That is fine for progressive square-pixel footage and wrong for anamorphic DVD material, where the stored raster is not the display shape. If you need exact dimensions, use the Width x Height option instead, which is also the correct place to fix anamorphic DVD material.

Is WebM safe to put straight into a <video> tag?

Yes, for the overwhelming majority of visitors. caniuse currently puts WebM at 96.25% global support, with Chrome from 25, Firefox from 28, Edge from 79, desktop Safari from 16.0, and iOS Safari from 17.4. The gap is older Apple hardware, so if you support long-tail iOS devices, ship an H.264 MP4 as a second <source> — you can produce one from the same file with MPEG to MP4.

Can I convert just one scene instead of the whole recording?

Yes. Trim takes a start time and a duration in either seconds or HH:MM:SS.sss, so you can encode a single scene out of a long capture without touching the rest. For a longer session of cutting where you want to preview the in and out points first, Video Cutter accepts .mpeg and .mpg directly.