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File Compressor

Reduce video and audio file sizes — entirely in your browser, no upload required. Drop a file to start or pick a format below.

Drop a video or audio file here to compress

Format will be auto-detected · file never leaves your device

Video

MP4

Compress MP4 files

WebM

Compress WebM files

AVI

Compress AVI files

MOV

Compress MOV files

MKV

Compress MKV files

FLV

Compress FLV files

WMV

Compress WMV files

3GP

Compress 3GP files

MPEG

Compress MPEG files

TS

Compress TS files

Audio

MP3

Compress MP3 files

WAV

Compress WAV files

OGG

Compress OGG files

FLAC

Compress FLAC files

AAC

Compress AAC files

M4A

Compress M4A files

M4V

Compress M4V files

OGV

Compress OGV files

3G2

Compress 3G2 files

DivX

Compress DivX files

WMA

Compress WMA files

Opus

Compress Opus files

AIFF

Compress AIFF files

AMR

Compress AMR files

AC3

Compress AC3 files

AU

Compress AU files

CAF

Compress CAF files

SPX

Compress SPX files

MP2

Compress MP2 files

DTS

Compress DTS files

How does browser-based compression work?

kaimdt Converter uses FFmpeg compiled to WebAssembly to re-encode your files at a lower bitrate — directly in your browser. Nothing is uploaded to any server; your data stays on your device.

Pick a compression template (Quality, Balanced, Fast, Turbo) or fine-tune individual settings like CRF, resolution, FPS and audio bitrate for full control over the output.