What you can edit on a Mac without buying anything

Every Mac comes with iMovie, a video editor that handles the most common tasks: trimming clips, arranging them in order, adding transitions between scenes, and including background music or voiceovers. If you have an iPhone or iPad, you already know how iMovie works there — the Mac version is nearly identical. For most people cutting together home videos, family clips, or short social media content, iMovie is enough.

If you want something more powerful without paying, DaVinci Resolve is free on Mac and does professional-level color correction, audio editing, and effects. It has a steeper learning curve than iMovie, but the free version is genuinely capable — many paid editors use it as their main tool. The trade-off is that it takes longer to learn and your Mac needs decent specs (at least 8GB of RAM, ideally more).

For very simple edits — a single clip you want to trim or rotate — you can also use the QuickTime Player that comes built into macOS. Open a video file, press the Edit menu, and you'll see trim and rotate options. This is the fastest route if you only need one or two cuts.

Key Takeaways

  • iMovie comes free on every Mac and handles trimming, arranging clips, adding transitions, and background music without any learning curve if you've used it on iPhone.
  • DaVinci Resolve is free and more powerful than iMovie, but requires a Mac with at least 8GB of RAM and takes longer to learn.
  • QuickTime Player, already on your Mac, can trim and rotate a single video in seconds if that's all you need.
  • Video files on Mac are usually MP4, MOV, or M4V — all three work in iMovie and DaVinci Resolve without conversion.
  • Exporting from iMovie takes a few minutes depending on video length and your Mac's speed; DaVinci Resolve can take much longer on older machines.

How to start editing in iMovie

Open iMovie from your Applications folder or Launchpad. Click File, then New Movie. You'll see a blank timeline at the bottom of the window and a media browser on the left showing your Photos library and any video files on your Mac.

Drag a video clip from the media browser onto the timeline. The clip appears as a rectangular block. Double-click it to see playback controls — you can watch it right there and decide if you want to keep it. To trim the clip, position your cursor at either end of the clip block until it turns into a resize arrow, then drag inward to cut out the beginning or end. iMovie shows you a preview as you drag, so you can see exactly where the cut lands.

Add a second clip by dragging another video below the first one. iMovie automatically places it after the first clip ends. Repeat until you've arranged all your clips in the order you want. If you want to delete a clip, click it once to select it, then press Delete.

Adding transitions, music, and titles

Transitions are the effects that play between clips — a fade to black, a slide, a dissolve. Click the Transitions button in the toolbar (it looks like two overlapping squares). A panel opens showing available transitions. Drag one onto the space between two clips. iMovie shows a small icon where the transition sits. Double-click the transition to adjust how long it lasts — most transitions are 0.5 seconds by default, but you can make them shorter or longer.

To add music, click the Music and Sound Effects button (it looks like a musical note). Search for a song or sound effect, or click the arrow next to "Music" to browse your iTunes library. Drag the audio onto the timeline below your video clips. The audio track appears as a separate bar. You can drag it left or right to change when it starts, and you can drag the edges to trim it like you do with video.

For titles and credits, click the Titles button. Choose a style, drag it onto the timeline before your first clip (for an opening title) or between clips. Double-click the title to type your text. iMovie plays the title animation automatically when you export.

How to use DaVinci Resolve if you want more control

Download DaVinci Resolve from Blackmagic Design's website — search "DaVinci Resolve free download" and look for the official site. Install it like any Mac app. Open it and create a new project. The interface is more complex than iMovie: you'll see a media browser on the left, a timeline at the bottom, and a large preview window in the center.

Import your video files by clicking File, then Import Media, or by dragging files directly into the media browser. Drag clips from the media browser onto the timeline. Trimming works the same way as iMovie — position your cursor at the clip edge and drag. DaVinci Resolve also lets you right-click a clip and choose "Trim to Playhead" if you play to a specific point and want to cut there.

The real advantage of DaVinci Resolve appears in the Color page (click the Color tab at the top). Here you can adjust brightness, contrast, saturation, and color balance for individual clips. You can also add effects and transitions, though the menus are less obvious than in iMovie. If you only need basic editing, iMovie is faster. If you're color-correcting footage or doing detailed audio work, DaVinci Resolve is worth the learning time.

Exporting your finished video

In iMovie, click File, then Export. Choose a preset based on where you're sharing the video: 1080p for YouTube or social media, 4K if your original footage is 4K, or a smaller size if you're emailing it. iMovie shows you the estimated file size and how long the export will take. Click Next, choose where to save the file, and click Save. The export runs in the background — you can keep working or close iMovie while it finishes.

In DaVinci Resolve, click the Deliver tab at the top. Choose a format from the left panel — H.264 is the standard for most uses. Adjust the resolution and quality if you want, then click the folder icon to choose where to save. Click Start Render. DaVinci Resolve exports in the foreground, so your Mac will be slower while it works. On older machines, exporting a 10-minute video can take 30 minutes or more.

Both programs save your project file separately from the exported video. The project file (with a .imovieproj or .drp extension) lets you reopen and edit later. The exported video is the finished file you share or upload.

Common problems and how to fix them

If iMovie won't import a video file, the file format might not be supported. iMovie works with MP4, MOV, M4V, and a few others, but not all formats. Try opening the file in QuickTime Player first — if QuickTime can play it, iMovie should be able to import it. If QuickTime can't play it, you may need to convert the file using a free tool like HandBrake before importing.

If your Mac is running slowly while editing, you have too much in the timeline or your Mac doesn't have enough RAM. Close other apps. If that doesn't help, try working with shorter clips or lower-resolution footage. DaVinci Resolve is especially demanding — if it's sluggish, switch to iMovie or reduce the resolution of your source files.

If the audio is out of sync with the video after export, this usually means the original file had a problem. Try re-importing the file or converting it with HandBrake first. In DaVinci Resolve, you can also right-click a clip and choose "Sync" to manually adjust audio timing.

When to move beyond free tools

iMovie and DaVinci Resolve handle most editing tasks, but they have limits. iMovie doesn't let you work with multiple audio tracks easily, and it can't do advanced color grading. DaVinci Resolve can do both, but it's not designed for fast, simple edits — it's built for precision work.

If you're editing regularly and want something between iMovie's simplicity and DaVinci's complexity, paid options like Final Cut Pro (Mac only, one-time purchase) or Adobe Premiere Pro (subscription, works on Mac and Windows) exist. But most people editing videos on Mac start with iMovie and only move to something else when they hit a specific limitation they can't work around.

Frequently Asked Questions

Can I edit 4K video on a Mac with iMovie?

Yes, iMovie handles 4K video, but your Mac needs decent specs — at least 8GB of RAM and a recent processor. Playback may stutter on older machines. If you're working with 4K, DaVinci Resolve is actually more efficient because it's designed for high-resolution work.

How do I add subtitles or captions to my video?

iMovie doesn't have a built-in captions tool. You can add text using the Titles feature, but it won't move with the video — it's static text over the footage. For actual subtitles, you'd need to use DaVinci Resolve (which has a captions page) or a paid tool like Final Cut Pro.

What's the difference between exporting and saving in iMovie?

Saving creates a project file (.imovieproj) that stores your edits and lets you reopen and change things later. Exporting creates the final video file (MP4 or MOV) that you can watch, upload, or share. You need to export to actually have a video file other people can watch.

Can I edit videos from my iPhone on my Mac?

Yes. Connect your iPhone to your Mac with a USB cable, or use AirDrop to send videos wirelessly. They'll appear in iMovie's media browser. You can also import videos from your Photos library if they're synced across devices.

Why is my exported video so large?

Video files are large by default. A 10-minute 1080p video is typically 1–2 GB. If you need a smaller file, export at a lower resolution or lower bitrate. iMovie's presets handle this automatically — choose a smaller preset if file size matters more than quality.