# Merge Videos — Merge videos on Mac

Join clips into one video, in the order you choose. Part of OneMacTools, 151 private tools in one native Mac app (macOS 26 or later); category: Video. Runs on your Mac; nothing is uploaded.

Drag clips into order and join them into one MP4. Clips with different sizes or no audio are handled for you, fitted to 1080p, 720p or 4K in landscape, portrait or square.

Page: https://www.onemactools.com/tools/merge-videos · Download: https://www.onemactools.com/download · Pricing: https://www.onemactools.com/pricing

## How to use it
1. **Install FFmpeg once.** The first time, OneMacTools offers to install FFmpeg through Homebrew with one click.
2. **Drop your clips.** Add two or more videos. They can have different sizes, shapes and frame rates.
3. **Put them in order.** The clips are joined in the order shown. Drag them in the list to reorder.
4. **Choose the size and shape.** Pick 1080p, 720p or 4K, and Landscape, Portrait or Square, in the right-hand panel.
5. **Click Merge.** The clips are joined into one MP4 called “Merged”, saved in a new dated folder in Downloads › OneMacTools. Play it with the Preview (eye) button or Show in Finder. The separate clips stay as they were.

## Options
- **Resolution:** 1080p (the default), 720p or 4K. Every clip is fitted into this size.
- **Shape:** Landscape (16:9, the default), Portrait (9:16) or Square (1:1). Clips that don't match the shape are fitted inside it with black bars, never stretched or cropped.

## Tips
- Pick the shape most of your clips already have. A portrait phone clip in a landscape merge gets wide black bars at the sides.
- Trim each clip first so the joined video doesn't have dead air between parts.
- Clips without sound are fine: silence is added for them so the audio stays in sync.
- Use 1080p unless every clip is 4K. Choosing 4K for phone clips only makes the file bigger.
- Run Compress to Size on the merged video if you need to email or post it under a limit.

## Questions
**How do I merge videos on a Mac?**
Drop two or more clips onto Merge Videos, drag them into order and click Merge. They're joined into one MP4.

**How do I change the order of the clips?**
Drag the clips up or down in the list before you click Merge. They're joined in the order shown.

**Can I join videos of different sizes or shapes?**
Yes. Each clip is fitted into the size and shape you choose, with black bars where it doesn't fill the frame. Nothing is stretched.

**What if one of my clips has no sound?**
That's fine. Silence is added for that clip, so the sound for the others stays in sync.

**Can I add transitions between clips?**
No. Clips are joined with straight cuts.

**Why do I see black bars in the merged video?**
A clip's shape doesn't match the Shape you chose, such as a portrait clip in a landscape video. Choose the shape most of your clips have, or crop clips first with Crop Video.