tinyvid.dev

Convert AVI to MP4

AVI is a decades-old Windows container that modern browsers simply won't play. Convert it to a lightweight MP4 that streams anywhere and embeds in one paste — free up to 200 MB, no account.

tinyvid · converter

Drop your video here

or browse files
MP4 · MOV · AVI · MKV · WebM · GIF|Free up to 200 MB
01About the conversion

Why convert AVI to MP4?

AVI (Audio Video Interleave) is a container Microsoft introduced back in 1992. It's still produced by old camcorders, screen-capture tools and legacy software, and it can wrap almost any codec — DivX, Xvid, MJPEG and more. That flexibility is exactly why it's a poor fit for the web: there's no guarantee a browser can decode what's inside.

No major browser plays AVI in a video tag — Chrome, Safari, Firefox and Edge all skip it — so an AVI on a web page simply won't appear. AVI files also lack modern streaming features and are often bulky, because the codecs of that era were far less efficient than today's.

Converting AVI to MP4 re-encodes the old stream into H.264 (with AV1 where it pays off) inside the universally supported MP4 container. TinyVid shrinks the file, smooths out the odd frame rates common in old AVIs, and gives you ready-to-paste embed code for any site.

02Step by step

How to convert AVI to MP4

  1. Drag your .avi file into the box above or browse from disk — up to 200 MB free, no sign-up.
  2. Choose a preset: Standard player for everyday embedding, or Max compression to squeeze an old file down.
  3. Optional: in Advanced settings pick H.264 for the widest reach and set a resolution cap.
  4. Hit Convert — TinyVid decodes the legacy AVI codec and re-encodes it to MP4.
  5. Copy the embed snippet and drop it straight into your page.
03FAQ
01How do I convert AVI to MP4 online for free?
Upload the .avi above, pick a preset and press Convert — files up to 200 MB convert to MP4 for free with no account. Up to 4 GB is a one-time payment by size.
02Why doesn't my AVI play in the browser?
No mainstream browser supports the AVI container in a video tag, and AVI can hold old codecs like DivX or Xvid that browsers can't decode. Converting to MP4 with H.264 makes it play everywhere.
03Is MP4 better than AVI for a website?
For the web, yes — MP4 is universally supported, streams progressively, and with modern codecs is far smaller than an equivalent AVI. AVI has no place in a video tag.
04Will converting a large AVI reduce its size?
Usually a lot. Old AVI codecs are inefficient; re-encoding to H.264 or AV1 typically produces a much smaller MP4 at similar visual quality.
05Does the audio survive the conversion?
Yes — TinyVid re-encodes the audio track to AAC alongside the video, unless you choose a muted preset like Hero background.
06Do I need to install codecs or software?
No. The conversion runs online, so there are no codec packs or apps to install — and no login for free or one-time paid conversions.