Compress MP4

Shrink an MP4 video in your browser.

Free
No signup
Nothing uploaded
No watermark

Drop a file here

MP4, WebM or MOV · read on your device, never uploaded

Made on your own device. The video is never uploaded.

How to Compress MP4 Online

Type the size you need to hit, or press one of the 8, 16, 25, 50 or 100 MB buttons, and the bitrate and resolution are calculated from the length of the clip. Size is bitrate times duration, so this is arithmetic rather than trial and error. If you have no target, a compression level caps the resolution and lowers the bitrate together, because halving the long edge is what actually shrinks a video.

Shrinks an MP4 in the browser. H.264 in MP4 is the most compatible combination there is, which is why compressing rather than converting is usually the right move when the only problem is file size.

No software to install Free Works on any device

Step-by-Step Guide to Compress MP4

1

1. Drop your MP4 file in, or click to choose one
2

2. Set the options if the defaults do not suit you
3

3. Press the button — Compress MP4 runs in your browser and the result downloads straight to your device

Try it now

What Does Compress MP4 Do?

Shrinks an MP4 in the browser. H.264 in MP4 is the most compatible combination there is, which is why compressing rather than converting is usually the right move when the only problem is file size.

MP4 file

.MP4

Shrink an MP4 video in your browser.

At a glance

Takes: .mp4
Gives: An .mp4, or WebM, under the size you asked for
Target: A size in MB you type, or 8, 16, 25, 50 or 100 MB buttons
How: Target bits over duration, after a nominal audio track; resolution capped to match
Encoder: WebCodecs and your device's hardware encoder
Runs: In the browser; the video is never uploaded

Why Use Video Tools in Your Browser?

Phone videos are large, and every app has its own rules for length, shape and format. Trimming, compressing, converting and resizing clips here gets them ready to post or send without uploading your footage to a stranger’s server.

“A shorter, smaller clip is far more likely to get watched.”

Clips that fit upload limits
GIFs from short moments
Subtitles converted and shifted
Screen recordings without software

Vertical videos for Reels
Sound pulled out as MP3
Only the scenes you want
Footage kept on your device

What You Can Do with Compress MP4

Understands MP4 structure rather than treating the file as bytes

Compression happens on your own machine, at your machine's speed

Says plainly where the result approximates rather than reproduces

Capture and encoding happen in the same tab, so no recording is written to a server

Targets a real size limit — an email attachment, an upload cap — rather than a vague quality slider

Why Use ToolXkit for Compress MP4?

Your files stay with you

Everything runs inside your browser. Nothing you open or type is uploaded to a server.

Clip Tools for Different Users

Content creators

Trim, crop and resize clips for each platform without a desktop editor.

Teachers and trainers

Record lessons on screen and cut videos down to the useful part.

Small businesses

Make short product videos and GIFs for shop pages and status updates.

Students

Shrink project videos to meet the upload limit of a college portal.

Support teams

Record bugs and walkthroughs, then compress them for tickets and emails.

Families

Share wedding and birthday clips that open on everyone’s phone.

Best Times to Trim or Compress a Video

Video tools are most useful when you are:

Posting a Reel or Short
Sending a clip over email
Playing a file your TV rejects
Making a GIF for a chat
Recording a how-to for a colleague
Adding subtitles to a lesson
Saving only the best moments
Pulling music out of a clip

Tips and Good to Know

A ten-minute clip forced under 8 MB will look rough, because the bitrate has to stretch over every second. Cut it down first with Trim Video.
Audio takes its share of the budget first, so a very small target leaves little for the picture.
It compresses MP4 only. For AVI, MKV or MOV, convert to MP4 first or use Compress Video, which accepts them.

Frequently Asked Questions

Answers to common questions about this tool.

Do I need to install anything to compress MP4?

No. Compress MP4 runs entirely in your browser — there is nothing to download, no extension and no desktop program. It works the same on Windows, macOS, Linux, Android and iPhone.

Is it safe to compress MP4 online?

Safer than the usual alternative, yes. Most online tools upload your file to a server you know nothing about, where it sits until someone deletes it. Here the file never leaves your device — the processing happens in the page itself, so there is no server copy to leak, retain or sell.

Is there a limit on video length or size?

The site sets no limit. Video processing happens on your own device, so long or high-resolution clips need more memory and time. Short phone clips are quick, while hour-long 4K files are better handled on a computer.

Why is Compress MP4 slower than a desktop editor?

Video work is heavy, and here it runs inside a browser tab using your device’s own processor. That keeps the footage private, but it can take longer than installed software. Keep the tab open until it finishes.

Will the quality drop after compression?

Some detail is lost when a video is made much smaller. Moderate compression is hard to notice on a phone screen, while very small targets make fast motion look blocky. Try a setting and watch the result before sharing.

Can I turn a landscape clip into a vertical Reel?

Yes. Reels & Shorts Maker and Resize & Crop Video crop a wide clip to the tall 9:16 shape that Reels, Shorts and status updates use. Download the vertical version and it is ready to post.

Compress MP4

How to Compress MP4 Online

Step-by-Step Guide to Compress MP4

1. Drop your MP4 file in, or click to choose one

2. Set the options if the defaults do not suit you

3. Press the button — Compress MP4 runs in your browser and the result downloads straight to your device