MP4
Basics
A widely used container for H.264/H.265 video and AAC audio.
Advantages
Broad device, browser, editor, and social-platform compatibility.
Limitations
Quality can decline when a lossy MP4 is encoded again.
100% client-side processing
AVI Compressor
Reduce a local AVI video's file size without uploading it. Choose the quality and output resolution that fit your use case.
Choose a video to begin.
About AVI compression
Compress AVI videos in your browser
AVI is a legacy Microsoft container often found in older Windows applications and video archives. It can be much larger than a comparable modern video file.
Best for
Modernizing and shrinking older video archives.
Compression tip
Balanced or Strong compression usually provides a meaningful size reduction for large legacy AVI files.
1
Choose a video
Select a local file. It is processed only on your device.
2
Adjust compression
Set the quality level and optionally reduce the maximum resolution.
3
Download the result
Preview the compressed MP4 and compare the output file size.
Supported input formats
Video formats this tool can process
MP4, WebM, MOV, MKV, AVI, FLV, and TS are accepted. A container alone does not guarantee compatibility: the video and audio codecs inside the file must also be available in the browser's FFmpeg runtime.
WebM
Basics
A web-focused container commonly paired with VP8, VP9, or AV1 video.
Advantages
Efficient for modern web playback and royalty-free workflows.
Limitations
Some older devices and desktop editors have limited support.
MOV
Basics
Apple QuickTime's container, often used by cameras and editing software.
Advantages
Strong fit for Apple and professional production workflows.
Limitations
High-quality files can be large and less convenient outside Apple tools.
MKV
Basics
A flexible Matroska container that can hold multiple audio, subtitle, and chapter tracks.
Advantages
Useful for archives and videos with multiple languages or subtitles.
Limitations
Native playback support varies across browsers, TVs, and phones.
AVI
Basics
A legacy Microsoft container used by older Windows applications.
Advantages
Often useful for preserving or importing older media libraries.
Limitations
Files tend to be larger and are less suitable for current web playback.
FLV
Basics
A legacy Flash Video container from earlier web-video workflows.
Advantages
Helpful for converting older archives into modern files.
Limitations
Flash is deprecated and current browser support is limited.
TS
Basics
An MPEG Transport Stream container common in broadcast and HLS segments.
Advantages
Resilient for transmission and common in streaming pipelines.
Limitations
Less convenient for editing, sharing, and seeking than MP4.
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MP4 Compressor
Compress MP4 videos directly in your browser. Reduce file size with quality and resolution controls.
WebM Compressor
Compress WebM videos directly in your browser. Reduce file size with quality and resolution controls.
MOV Compressor
Compress MOV videos directly in your browser. Reduce file size with quality and resolution controls.
MKV Compressor
Compress MKV videos directly in your browser. Reduce file size with quality and resolution controls.
FLV Compressor
Compress FLV videos directly in your browser. Reduce file size with quality and resolution controls.
TS Compressor
Compress TS videos directly in your browser. Reduce file size with quality and resolution controls.