How to compress a video
- 1
Click Choose file or drop a video — MP4, MOV, WebM, MKV, AVI and other common formats work.
- 2
Choose a Compression level — Recommended is a good balance, Strong gives the smallest file, Light the best quality.
- 3
Choose a Max resolution — 720p by default, 1080p for larger screens, 480p for the smallest size, or Original to keep it.
- 4
Click Convert and wait for the progress bar. The compressed MP4 downloads automatically.
Why are videos so large?
Phones record at high bitrates so footage still looks good after editing: a minute of 4K iPhone video can weigh several hundred megabytes, and even 1080p fills up fast. That’s great for your library, but not for sending. Email attachments, chat apps, school and job platforms all have size limits, and on a mobile connection a large file takes ages to send.
Two things decide the size of a video:
- Resolution — how many pixels each frame has. 4K has nine times the pixels of 720p.
- Bitrate — how much data is spent per second. Modern encoders like H.264 can spend far less while keeping the picture clean.
TurboConvert lowers both: the Max resolution option scales the picture down (the proportions are kept), and the Compression level controls how aggressively the encoder reduces data.
Which settings to choose
| Goal | Compression | Max resolution |
|---|---|---|
| Keep it sharp for a TV or a large monitor | Light | 1080p |
| Share in chat apps or social media | Recommended | 720p |
| Send by email | Strong | 720p or 480p |
| Smallest possible file | Strong | 480p |
| Reduce size without changing resolution | Recommended | Original |
Most people watch shared videos on a phone, where 720p looks sharp. If you only remember one setting, use Recommended + 720p — the default.
Tips for a smaller file
- Trim first. Duration multiplies everything. Cutting the dead time at the start and end with Trim video often saves more than any setting.
- Remove the sound if you don’t need it. Mute video drops the audio track entirely.
- Need just the audio? MP4 to MP3 turns a 200 MB talk into a few megabytes.
- Want a short loop? A clip of a few seconds can be shared as a GIF with Video to GIF.
- Got an iPhone MOV? You can compress it directly — the output is an MP4 that plays everywhere. To change the format without compressing, use MOV to MP4.
What the levels mean
The three Compression levels set how much detail the encoder is allowed to discard:
- Light — best quality: almost indistinguishable from the original on a phone or laptop screen. Choose it for footage you’ll keep or show on a big screen.
- Recommended — good quality: the best trade-off for sharing. Fine detail in fast motion may soften slightly, but faces, text and colors stay clean.
- Strong — smallest file: visible softening, especially in dark or busy scenes, in exchange for a much smaller file. Good for previews, drafts and email.
Combined with a lower Max resolution, even the Recommended level usually gives a dramatic reduction for phone footage.
How it works
TurboConvert uses FFmpeg, the open-source engine behind many professional video tools, compiled to WebAssembly so it runs inside your browser. Your video is read from your disk, re-encoded on your device’s processor and saved to your downloads. Nothing is uploaded: there’s no waiting for a large file to transfer, no queue, no watermark, and no copy of your video on anyone else’s server — an important difference for family videos, client footage or recordings of meetings.
The trade-off is speed: your computer does the work instead of a server farm. A desktop or laptop is recommended for long videos; on a phone, keep the screen on and the tab in the foreground until the download starts.
Common problems
- It’s slow: compression is the heaviest operation a video tool does. Choose a lower max resolution — fewer pixels to encode makes it faster as well as smaller.
- The file barely shrank: the source was already efficiently compressed (for example a video downloaded from a streaming platform). Pick Strong and a lower resolution.
- The page reloaded on my phone: mobile browsers may pause background tabs. Stay on the page during the conversion, or use a computer.