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Compress Video

Cut video file size down with H.264 while keeping it watchable. Some detail is discarded to fit the target format; how much depends on the format and your settings.

Not uploaded to any serverConverted on this deviceGone when you close the tabHow this works

Drop your files here

MP4, MOV, MKV, WebM and 7 more formats · up to 512 MB each

or paste files from your clipboard

Ready when you are

Cut video file size down with H.264 while keeping it watchable. Everything happens in this tab; nothing is sent anywhere.

⌘K to search converters

How to use it

  1. 1

    Add your files

    Compress Video works with MP4, MOV, MKV, WebM, AVI, FLV, MPEG, 3GP, TS, OGV and WMV. Drop them in, browse for them, or paste from your clipboard.

  2. 2

    Choose your options

    Tune codec, resolution and bitrate and the audio track — or leave the defaults, which are sensible.

  3. 3

    Run it and download

    Press the button and save the result. Everything happens on your device, and nothing is uploaded.

Privacy, in plain words

Is it safe? Your video file is not uploaded anywhere

What “uploaded” normally means. On most online converters, pressing the button copies your file across the internet onto a computer owned by that website. That copy is what the word “upload” means, and it is the part nobody explains.

What happens instead. This site does not do it. There is no server here that receives files, so your video file is read, converted and handed back by the browser you are using right now. It never travels — so there is no copy to store, read, leak or hand over.

Check it yourself in ten seconds

Turn off your Wi-Fi after this page has loaded, then convert a file anyway. It still works, because everything needed is already on your device.

The longer explanation of how this works, and the full detail of what is and is not stored on the privacy page.

Why this matters more than it sounds

Video is the format where the thing being converted is usually a recording of people, and often of people who did not expect a third party to have a copy. It matters more than it sounds, because of what video files usually are:

Family videos

children, addresses, the inside of your house

Medical or therapy consultations

clinical recordings under strict handling rules

Unreleased footage

material under embargo or still being edited

Recorded meetings and calls

everything said, by everyone in the room

A file that is never sent cannot be kept, leaked, subpoenaed or used to train anything. That is a property of how this works, not a promise about how carefully it is run.

How Compress Video works

Cut video file size down with H.264 while keeping it watchable. Everything happens inside this page: the file is read from your device into memory, processed there, and handed back as a download. It is never sent anywhere, and closing the tab discards it.

What it accepts
MP4, MOV, MKV, WebM, AVI, FLV, MPEG, 3GP and 3 more. Files are identified by their contents rather than their name, so a mislabelled file is still handled correctly.
What you get back
A MP4 file, downloaded straight to your device.
What happens to the data
The result is re-encoded, so some detail is discarded permanently. Starting from the original rather than from an already-processed file keeps that loss to one pass.
Size limit
Up to 512 MB per file. Because the work happens on your own machine, available memory is the real constraint — a laptop handles far more than a phone.

The settings, and what each one changes

Compress Video exposes 8 settings. The defaults are chosen to suit the common case, so changing nothing is a reasonable way to start.

Target
Free text, used exactly as you type it.
Resolution
Choose between Keep original, 4K — 2160p, QHD — 1440p, Full HD — 1080p and others.
Frame rate
Choose between Keep original, 60 fps, 30 fps, 24 fps and others.
CRF
Constant Rate Factor. Lower is better quality. 18–28 is the useful range.
Encoder speed
Choose between Ultrafast, Very fast, Medium, Slow.
Video bitrate
Leave empty to let CRF decide. Setting this switches to fixed-bitrate encoding.
Audio
Choose between Keep audio, Remove audio.
Measured, not estimated

What this tool actually does to a file

Compressing a two-second clip at the default Recommended preset, with nothing else changed.

It depends entirely on the content: across the samples the result ranged from about the same size to 11% larger, with a middle case 7% larger.

Each row is one document, chosen because this tool behaves differently depending on what is inside the file.
SampleInOutChange
An easy clipThe compressible end of the range — a clean tone, or a moving test pattern — where a codec does its best work.70.9 KB78.8 KB+11%
A hard clipThe other end — pink noise, or dense video grain. Close to incompressible by design, and the worst case for every codec.1000 KB1019 KB+2%

Produced by this site's own converter. The same code that runs in your browser, at the same default settings, so these are the bytes you would download.

Samples are generated from a fixed seed rather than taken from real photographs or documents, so the corpus is reproducible and carries no licensing question — and so the numbers predict the shape of your result rather than its exact size. Measured 2026-10-01. The method, and the command that regenerates every figure on this page, are on the how it works page.

About these formats

Accepts

MPEG-4 Part 14

The default video container of the internet.

Extensions
.mp4, .m4v
MIME type
video/mp4
Best for
Sharing anywhere · Streaming · Social media
Compatibility
Plays on effectively every device.

Accepts

QuickTime Movie

Apple's QuickTime container, common from iPhones and cameras.

Extensions
.mov, .qt
MIME type
video/quicktime
Best for
Apple ecosystem · Video editing
Compatibility
Excellent on Apple, patchy on Windows and Android.

Good to know

Compress Video — questions

How does Compress Video work?

Cut video file size down with H.264 while keeping it watchable. Add your files above, adjust anything you want to change, and press the button. The result downloads straight to your device.

Is Compress Video safe — are my files uploaded to a server?

No, nothing is uploaded. On most online tools, pressing the button copies your file across the internet onto a computer owned by that website, where it is processed and then sent back. That copy is what "upload" means. This tool does not do it: your file is read and processed by the browser you are using right now, stays on this device the whole time, and is discarded when you close the tab. Turn off your Wi-Fi after the page loads and it still works, which is the quickest way to confirm it.

Can I use this on confidential or personal documents?

Yes — that is the case it was built for. Because the file never leaves your device, a confidential document is no more exposed than it is sitting in your own folder: there is no transfer, no copy on anybody else's hardware, no retention period and no staff with access. Nothing about the file is logged either — not its name, not its size, not its contents.

Do I need an account?

No. Every tool on FileTools360 works without signing up, and there is no watermark on the output.

What is the file size limit?

512 MB per file. Since everything runs locally, your device's available memory is the real constraint.

Read more about these formats

How to Make a Video File Smaller Without Ruining It

The three settings that matter, in the order they matter.

MP4 vs MOV: Which Video Format Should You Use?

Two near-identical containers with very different real-world support.

Related converters

All video converters
MP4 → MP3
MOV → MP4
Extract Audio from Video
Rotate Video
Trim Video
MKV → MP4
WebM → MP4
GIF → MP4

Runs entirely in your browser

FileTools360 by the numbers

527 converters and tools65 file formatsnothing ever uploaded.