AVI video caps uploads at Web or CMS MP4 upload 100 MB, Email or chat attachment 20 MB, Small form upload 10 MB. VidSmaller compresses any video down to 95 MB so it fits on the first attempt — H.264 MP4 out, no watermark, nothing to install, no account needed to try it. Cloud encoding keeps running if the tab closes. The no-account trial accepts videos up to 3 minutes and 200 MB; paid plans accept files up to 1.5 GB.
AVI is an older container that can hold many codecs, including lightly compressed or legacy video that creates very large files and poor browser compatibility.
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Checking your file limits…
Supported: mp4, webm, mov, mkv, avi, wmv and 33 formats in all
Convert the source to H.264 MP4 while targeting the destination size. This replaces the legacy container and reduces bitrate in the same job.
| Plan / upload method | Maximum file size |
|---|---|
| Web or CMS MP4 upload | 100 MB |
| Email or chat attachment | 20 MB |
| Small form upload | 10 MB |
Limits verified 2026-10-31. Sources: MDN — Media container formats: AVI · Microsoft Learn — AVI RIFF file reference
Every other page tells you the limit and stops there. The limit is the easy half. Here is the half that decides whether your video is watchable: at a 95 MB target, this is exactly how much bitrate is left for each duration, and the largest resolution that bitrate can carry without falling apart.
| Video length | Bitrate left for video | Resolution it carries | Verdict |
|---|---|---|---|
| 1 min | 12,888 kbps | 1440p | Looks fine |
| 5 min | 2,475 kbps | 720p | Looks fine |
| 10 min | 1,174 kbps | 480p | Looks fine |
| 30 min | 306 kbps | 360p | Visibly rough |
Method: the bitrate column is arithmetic — 95 MB spread across the duration, minus 128 kbps for stereo audio and 2% for container overhead. It is a hard ceiling, not an estimate. The resolution and verdict columns are a recommendation, derived from published H.264 bitrate ladders and pulled down about a third, because re-encoding footage that has already been compressed once survives lower bitrates than encoding a clean master does. Deliberately conservative — we would rather under-promise than tell you a video will look fine when it will not.
The left column is what you have to spend at each length; the cells are what each resolution needs. Green means you clear it comfortably, amber means it is watchable but soft, and grey means pick a smaller frame. Reading down a column shows how long a clip can get before that resolution stops being worthwhile on AVI video.
Source: Computed, not measured — no encoder was run to produce this figure · Method: 95 MB spread over the duration, minus 128 kbps audio and 2% container overhead. Thresholds come from published H.264 bitrate ladders, reduced by about a third for re-encoded source.
An AVI can contain old compressed video, lightly compressed frames or a codec that current browsers do not include. Two files with the same extension can behave completely differently. The conversion process must decode the actual stream first, then encode a modern H.264 MP4. If the codec cannot be decoded reliably, changing the filename will not fix the source.
AVI files created by older capture tools may prioritize editing speed over storage. That can leave far more data than normal playback needs. A delivery encode can be much smaller, especially when the source is standard definition or contains static material. Judge the result by readable detail and motion rather than trying to preserve the original bitrate.
Older AVI footage can be interlaced. If comb shaped edges appear during motion, the source may need deinterlacing before or during compression. A smaller progressive MP4 with correct deinterlacing can look better than a larger file that preserves the artifacts. Keep the original because deinterlacing choices are difficult to reverse.
AVI can carry audio and timing combinations that modern players handle inconsistently. A straightforward H.264 video and AAC audio MP4 is easier to upload and share. Verify synchronization from start to finish, especially on long archival captures where damaged indexes or variable timing can reveal problems late in the file.
MP4, MOV, MKV, AVI, WebM and 33 formats in all. Nothing to install — your browser uploads over a one-time link and the file never touches a third party.
We pre-set it below the hard ceiling on purpose. A target-size encode usually lands within a couple of percent of the number you gave it, but we have measured footage that overshoots by up to a tenth — and landing over a hard limit means the upload fails. Change it if you want a different number.
Encoding runs on our servers, so you can close the tab. The result comes back with no watermark on any plan, in an MP4 that an AVI video will accept.
AVI can contain lightly compressed frames or older codecs with inefficient settings. The extension alone does not reveal how much compression was used.
Support is unreliable compared with H.264 MP4. Converting to MP4 is the safer choice for websites, phones and common upload forms.
Re-encoding is lossy, but a sensible bitrate and resolution can preserve useful detail while reducing size substantially.
Yes, depending on how it was created. A delivery MP4 normally keeps the primary audio track for simpler playback.