Compress a video on your Mac without uploading it
By Himanshu Ranjan · Updated 8 November 2026
To compress a video on your Mac, select it in Finder, hold the right Option (⌥) key and choose Compress › Compress to 720p, or pick a size target such as Compress under 25 MB. FileDial saves a smaller copy beside the original and shows the size before and after. The video is processed on your Mac and never uploaded.
How to do it with FileDial
- Select one or more videos in Finder.
- Hold right ⌥ to open the dial at the pointer.
- Choose Compress › Compress to 720p, or a size target such as Compress › Compress under 25 MB.
- Check the result card for the size before and after; the new file sits beside the original.
- Not happy with it? Press Undo and try another option.
Your original file stays untouched. The result is saved beside it, and every result has Undo.
Which option to pick
| Tool | Use it when |
|---|---|
| Compress to 1080pCompress | You want a smaller copy that keeps full HD, for example a 4K clip you still want to watch on a large screen. |
| Compress to 720pCompress | Sharing in chat, on the web or on a phone, where 720p usually looks fine and files get much smaller. |
| Compress to 480pCompress | Size matters more than detail: quick previews, drafts for review or slow connections. |
| Compress under 50 MBCompress | You have a hard upload or attachment limit around 50 MB and care about the size, not the resolution. |
| Compress under 25 MBCompress | A typical email attachment limit; aim here when a video has to go out as an attachment. |
| Compress under 10 MBCompress | Very strict limits, such as forms or chat apps that refuse larger files. Best for short clips. |
Resolution or file size: which option to pick
A video's file size depends mostly on its bitrate, the amount of data spent on each second, and its length. Resolution is one lever on that: fewer pixels need fewer bits to look clean, which is why dropping from 4K or 1080p to 720p shrinks a file so much. The resolution options in FileDial are the right choice when you know where the video will be watched.
For most sharing, 720p is enough. Phone screens, chat windows and embedded web players rarely show the difference between 720p and 1080p at normal viewing distance, while the file is far smaller. On a MacBook, FileDial compressed a 366 MB 1080p video to 720p in 23 seconds, producing a 117 MB file.
The size-target options work the other way round. Compress under 25 MB, under 50 MB and under 10 MB start from the limit you have to meet. Because length drives size, a long video squeezed under 10 MB has very few bits per second to work with, so expect visible softness. For long recordings, trim first, then compress.
- Watching on a TV or large monitor: Compress to 1080p.
- Sending in chat or posting online: Compress to 720p.
- Email attachment: Compress under 25 MB.
- Rough draft for feedback: Compress to 480p.
Why not use an online video compressor
Online compressors ask you to upload the whole file, then download the result. With video that means hundreds of megabytes travelling both ways, and footage of your family, your clients or your workplace sitting on a server you know nothing about.
There is also a security angle. On 7 March 2025 the FBI Denver Field Office warned that free online document converter tools are increasingly used to spread malware: the conversion works, but the returned file can carry malware that leads to ransomware, and the sites can scrape personal data such as identity numbers, banking and crypto details, emails and passwords. The warning was about document converters, but the same upload-and-download pattern applies to video sites.
FileDial runs every tool on your Mac. The video is never uploaded, and compression works with Wi‑Fi off.
Other ways to compress a video on a Mac
macOS already includes free ways to make a video smaller. In QuickTime Player, open the video and choose File › Export As, then pick a lower resolution such as 720p or 480p. iMovie can share a project at a chosen resolution and quality. Finder can also re-encode selected videos from its right-click menu with Encode Selected Video Files, found under Quick Actions or Services depending on your setup.
These are good for a single file when resolution is all you need. FileDial is the better fit when you have an exact size target like 25 MB, when you want to compress a whole batch with one action, when you want the same presets every time, or when you want Undo and a clear before-and-after size on every result.
Questions
Does compressing a video in FileDial change the original?
No. Each compress tool saves a new copy beside the original, and the original file is left as it was. The result card shows the size before and after, and every result can be undone.
How do I compress a video for email on a Mac?
Select the video in Finder, hold right ⌥ and choose Compress › Compress under 25 MB. That size suits typical email attachment limits. For long videos, trim the parts you don't need first so the compressed copy keeps more detail.
Is my video uploaded anywhere?
No. Every FileDial tool runs on your Mac and files are never uploaded. Compression works with Wi‑Fi off. The only things that go online are the licence check and optional anonymous usage counts, which never include file names, paths or contents.
Can I compress several videos at once?
Yes. Select all the videos in Finder, open the dial and choose one compress option. FileDial runs it on every selected file and saves each smaller copy beside its original.
How fast is it?
On a MacBook, a 366 MB 1080p video was compressed to 720p in 23 seconds, producing a 117 MB file. Speed depends on the length of the video and your Mac.
What does FileDial cost and which Macs does it run on?
There is a 1-day free trial with every tool, no card and no account. After that it is $20 once for a lifetime licence on 2 Macs. It needs macOS 14 Sonoma or later on an Apple silicon Mac.