AVI is a legacy format from the 1990s that's large, often uncompressed, and incompatible with many modern devices. Re-encoding to H.264 MP4 typically reduces file size by 60–80% while producing a file that plays on every phone, tablet, and smart TV.
Convert old AVI files to modern H.264 MP4 — smaller files, better compatibility.
Upload your AVI file using the tool above, make sure the output codec is set to H264 and the container to MP4, then click Convert. No software installation required — encoding runs on our GPU servers.
Yes. The public tool works without sign-up for capped preview jobs up to 720p and 200 MB. Create a free account to unlock up to 8K/120fps, larger files, starter credits, and production encoding workflows.
Encoding speed depends on file length, queue depth, codec, and selected resolution. Short public jobs usually finish quickly, while account jobs give you higher limits and production controls.
H.264 (AVC) is a modern video codec with broad compatibility across virtually all devices and platforms. Converting to MP4 (H.264) is ideal for maximum device compatibility — every TV, phone, browser and player supports H.264.
Yes. By default the tool re-encodes audio to AAC at 192 kbps for MP4/MKV/MOV, or Opus at 128 kbps for WebM. You can also choose to copy the original audio stream unchanged or strip it entirely using the Audio selector.
The public encoder is useful for quick previews. For larger files, up to 8K/120fps output, bulk jobs, API access, storage outputs, and webhooks, create an account and run production workflows with predictable NEU estimates.