How to Compress an AVI Video Online
Follow these three simple steps to compress an AVI video. No software installation required.
Select an AVI Video
Choose one AVI file from your device.
Choose Quality and Resolution
Select a video quality level and keep the original resolution or choose a lower output resolution.
Compress and Download
Start compression, compare the original and output file sizes, and download the compressed video.
How Does the AVI Compressor Work?
AVI video compression reduces file size by removing redundant information during re-encoding. CompressFly uses the H.264 codec to retain high visual quality while reducing the amount of data stored in the video. The selected quality and resolution settings control the balance between output size and visual detail.
CompressFly handles AVI compression with modern browser technology. No files are sent to a server: everything is processed locally in your browser. Smart video compression makes reducing AVI file size simple and free, with no signup required.
What "processed in your browser" means
- Your AVI file is not uploaded to a server.
- Compression runs locally on your device.
- The compressed video is created in your browser and downloaded directly to your device.
AVI Compression FAQs
How do I compress an AVI video online?
Use this online AVI compressor to reduce AVI video file size in three steps: 1. Select one AVI video from your device. 2. Choose the output quality and optional resolution. 3. Compress the video and download the result.
How can I compress an AVI video without losing quality?
Choose the High quality preset to retain as much visual detail as possible. Keep the original resolution when reducing the dimensions is not necessary.
How does the AVI compressor reduce file size?
The compressor re-encodes the AVI video with H.264 at a lower effective bitrate. Bitrate is the main factor that determines file size, while lowering the resolution—for example, from 4K to 1080p—can reduce it further. Everything runs locally in your browser.
How much smaller can an AVI video get?
Some high-bitrate AVI videos can become 50–90% smaller, but this is not guaranteed. AVI files that already use an efficient codec or a low bitrate may shrink much less. The result depends on the source codec, bitrate, resolution, motion, and selected settings.
How do quality and resolution affect AVI compression?
A lower quality setting usually creates a smaller file with more visible loss. Lowering the output resolution can reduce the size further, while keeping the original resolution preserves the source dimensions.
Is there an AVI file size limit, and is my video uploaded?
Your AVI video is processed locally in your browser and is not uploaded to a server, so there is no server upload limit. The practical limit depends on your device's available memory and processing power, as well as the video's length and resolution.