Local Video Compressor

Compress Video Online Without Uploading

Reduce MP4, MOV, MKV, AVI and WebM file size directly in your browser. Your videos stay on your device.

Local processing

Video Compression Guide

Local compression for private videos

Use this tool for screen recordings, work demos, chat attachments and social clips that you do not want to upload.

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MP4 MOV WebM MKV AVI

Features

Why use local video compression

The goal is a clear, controllable workflow with fewer privacy and upload risks.

Local browser processing

Files stay in the browser's temporary memory file system and are not uploaded.

Target-size compression

Enter a desired MB size and the app estimates the bitrate from video duration.

Common format support

Use MP4, MOV, WebM, MKV or AVI as input and download MP4 output.

Basic and advanced modes

Start quickly or tune codec, CRF, preset and compatibility.

Supported Formats

Popular video formats supported

Input supports MP4, MOV, WebM, MKV and AVI. Output is MP4 for broad playback support.

.mp4 Most universal format
.mov Common on Apple devices
.webm Web-optimized format
.mkv Open container format
.avi Classic video format
.MP4 Unified output format

How It Works

Compress in three steps

Sign in first. No server upload.

01

Choose a local video

Click the upload area or drop a file. The browser reads size, duration and resolution.

02

Set a compression target

Use target MB for a quick result, or switch to advanced settings.

03

Download the result

Compare sizes, preview the output and save the MP4 file.

Privacy

What local processing means

The browser reads the full file only in the current session. This tool does not save file lists, snapshots, video content or output files.

Good for private content

Compress work materials, recordings or internal training videos locally before sharing.

Still limited by the browser

Compression uses CPU and memory. Keep the page open and prefer a desktop browser for large files.

Quality

Compression does not have to destroy quality

Smart bitrate calculation and codec choices help reduce size while preserving quality.

Smart bitrate estimate

Target size and duration are used to estimate a practical video bitrate.

Codec choices

H.264 is compatible. H.265 can be smaller but slower.

Quality controls

CRF presets help choose between quality and file size.

Use Cases

Common use cases

These workflows balance file size, quality and privacy.

Phone recordings

Reduce large screen recordings before sharing or archiving.

Work demos

Compress private demos and internal recordings before sending.

Social uploads

Lower upload time and failure risk before posting.

Email attachments

Aim for a specific MB size near attachment limits.

FAQ

FAQ

Local processing, output format, compression quality and browser limits.

Are videos uploaded?

No. The file is read by your browser and processed with ffmpeg.wasm on your device.

Why might the output not be smaller?

A video that is already compressed may not shrink much. Try higher CRF or a smaller target.

Why do large files fail more often?

Large files need more memory and CPU. Desktop browsers are more reliable.

Should I use H.264 or H.265?

Use H.264 for compatibility. H.265 can be smaller but is slower and less compatible.

Can I close the page while compressing?

No. Closing or refreshing the page interrupts the task and clears temporary files.

Use Cases

Common use cases · VideoCompressTool

These workflows balance file size, quality and privacy.

Compressed size

Compressed size

Smart bitrate calculation and codec choices help reduce size while preserving quality.

Language

Language

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Free and paid service

Free account

Free signed-in accounts can compress 1 video per day. The same local browser compressor, MP4 output, format detection and privacy-first processing remain available.

Free account

Free signed-in accounts can compress 1 video per day. The same local browser compressor, MP4 output, format detection and privacy-first processing remain available.

Lifetime membership

After payment is confirmed, the account receives lifetime access and can compress without the daily free-use limit. The membership is tied to the signed-in account.