The fastest way to shrink a video file

The size of a video file depends on three things: how long it is, what resolution it plays at, and how much the file is compressed. You can reduce file size by lowering any of these three, but compression gives you the most control. Most video editing software and free tools let you export the same video at a lower bitrate — the amount of data stored per second — which shrinks the file without changing what you see on screen.

If you need a smaller file right now, the simplest path is to use HandBrake, a free program that works on Windows, Mac, and Linux. You open your video file, choose a preset like "Fast 720p30" or "Very Fast 480p30", and click Start. HandBrake handles the compression automatically and saves a new, smaller file. The whole process takes minutes to an hour depending on your video length and how powerful your computer is.

If you want to keep your video at its current resolution but just make the file smaller, you can also re-export it from whatever program created it — Adobe Premiere, DaVinci Resolve, iMovie, or Windows Photos — by choosing a lower quality or bitrate setting before you save.

Key Takeaways

  • Compression is the easiest way to shrink a video file; you can reduce size by 50 to 80 percent without changing resolution or length.
  • HandBrake is free and works on all operating systems; it automates compression and requires only that you select a preset and click Start.
  • Lowering resolution (from 1080p to 720p, for example) shrinks files faster than compression alone but changes what the video looks like.
  • Trimming the video or removing audio entirely will reduce file size, but only if you do not need those parts.
  • Different video formats (MP4, WebM, MOV) compress differently; MP4 is the most widely compatible and usually compresses well.

Understanding video compression and bitrate

Video compression works by storing less information per second of video. A bitrate is measured in megabits per second (Mbps). A typical 1080p video might be recorded at 10 Mbps, meaning 10 million bits of data for every second of video. If you re-export that same video at 5 Mbps, the file will be roughly half the size, but you will not see a dramatic difference unless you pause and look closely.

The trade-off is real but usually invisible at normal viewing speeds. A video at 5 Mbps looks softer than one at 10 Mbps if you zoom in or watch on a large screen, but on a phone or in a web browser, most people cannot tell the difference. This is why compression is the first choice: you get a much smaller file with almost no visible loss.

Different codecs — the algorithms that do the compression — work at different efficiency levels. H.264 (also called AVC) is the standard codec for MP4 files and is supported everywhere. H.265 (HEVC) compresses better, meaning smaller files at the same quality, but not all devices can play it. WebM format uses the VP9 codec and compresses very efficiently, but again, not all devices support it. For most purposes, H.264 in an MP4 container is the safest choice.

Using HandBrake to compress your video

Download HandBrake from handbrake.fr (the official site). Install it like any other program. Open HandBrake and click the folder icon to select your video file.

On the right side, you will see a list of presets. These are pre-configured compression settings. "Fast 720p30" means the video will be compressed quickly and output at 720p resolution at 30 frames per second. "Very Fast 480p30" is smaller and faster but lower quality. Start with a preset close to your current resolution — if your video is already 1080p, choose a 1080p preset, or drop to 720p if you want a much smaller file.

Click the Start button. HandBrake will show a progress bar. Depending on your video length and computer speed, this can take anywhere from a few minutes to an hour. When it finishes, you will have a new MP4 file in the folder you chose. The original file stays unchanged.

Lowering resolution for bigger file size reductions

If compression alone is not enough, lowering resolution will shrink the file much more. A 1080p video (1920 × 1080 pixels) contains four times as much visual information as a 720p video (1280 × 720 pixels). Dropping from 1080p to 720p can cut file size by 50 percent or more, depending on bitrate.

This is a visible change. The video will look softer and less detailed, especially on a large monitor or TV. On a phone screen or in a small web player, most people will not notice. If your video is going to be watched on a phone or shared on social media, 720p is usually fine. If it will be watched on a TV or edited further, keep it at 1080p and use compression instead.

You can set resolution in HandBrake by choosing a preset with your target resolution in the name, or by clicking the Video tab and changing the width and height manually. You can also lower the frame rate — changing from 30 fps to 24 fps saves a little space and is common in film and streaming video.

Re-exporting from your editing software

If you created the video in editing software like Adobe Premiere, DaVinci Resolve, iMovie, or Windows Photos, you can shrink it without using a separate tool. Open your project, go to File > Export or File > Save As, and look for a quality or bitrate setting.

In Adobe Premiere, this is under File > Export > Media. You will see a dropdown for Bitrate Encoding. Choose "Variable Bitrate" and set the target bitrate lower than the original — try 6 Mbps if the original was 10 Mbps. In DaVinci Resolve, go to File > Export and adjust the bitrate in the Video tab. In iMovie on Mac, go to File > Share > File and choose a quality level from the dropdown.

This approach is faster than using HandBrake if you already have the software open, but it requires you to know where the export settings are in your specific program. If you do not have editing software, HandBrake is simpler.

Trimming and removing audio to save space

If your video has long sections you do not need, trimming it will reduce file size proportionally. A 10-minute video that you trim to 5 minutes will be roughly half the size. You can trim in HandBrake by clicking the Range button and setting start and end times, or in any video editor by deleting the unwanted sections before you export.

Audio also takes up space. A typical video has stereo audio (two channels) at 128 kbps. If you do not need audio — for example, if you are creating a silent social media clip — you can remove it entirely and save 10 to 15 percent of file size. In HandBrake, click the Audio tab and delete the audio track. In most editors, you can mute or delete the audio track before exporting.

Removing audio is permanent, so only do this if you are sure you do not need it. If you might need it later, keep the original file and create a separate audio-free version for sharing.

Choosing the right format for your situation

MP4 is the standard format for video on the internet and works on all devices. If you are sharing a video online or sending it to someone, MP4 is the safest choice. WebM compresses better and is used by some websites, but not all devices can play it. MOV is Apple's format and works well on Mac and iOS, but Windows and Android devices sometimes struggle with it.

If you are uploading to YouTube, Facebook, or Instagram, use MP4. If you are sharing with someone on Mac, MOV is fine. If you are embedding video on a website and want the smallest possible file, WebM is worth trying, but have an MP4 backup in case visitors cannot play it.

The format you choose does not matter as much as the bitrate and resolution. A well-compressed MP4 at 5 Mbps will be smaller and look better than a poorly compressed WebM at 8 Mbps.

Frequently Asked Questions

How much smaller will my file be if I compress it?

That depends on the original bitrate and how much you lower it. Cutting the bitrate in half usually cuts file size by 40 to 60 percent. Lowering resolution from 1080p to 720p cuts it by roughly 50 percent. Combining both can reduce file size by 70 to 80 percent, though the video will look noticeably softer.

Will compression make my video look bad?

Not at normal viewing speeds on a phone or computer. You might see a slight softness if you pause and zoom in, or if you watch on a very large screen. Most people cannot tell the difference between a video at 10 Mbps and one at 5 Mbps unless they are looking for it. Start with a moderate compression and watch a sample before you compress the whole file.

Can I compress a video that is already been compressed?

Yes, but the quality will drop more than if you had compressed the original. Every time you compress, you lose some information. If you have the original uncompressed or lightly compressed file, use that. If all you have is an already-compressed video, you can still make it smaller, but it will look worse than compressing the original would have.

Does HandBrake work on my phone?

HandBrake is only available for Windows, Mac, and Linux computers. For phones, you can use apps like VidCompressor (Android) or Video Compressor (iOS), though they are usually slower and less flexible than HandBrake on a computer.

What bitrate should I use?

For 1080p video, 5 to 8 Mbps is a good balance between file size and quality. For 720p, 3 to 5 Mbps works well. For 480p, 1 to 2 Mbps is enough. Start with the middle of that range and watch a sample to see if it looks acceptable to you.