The simplest way to combine videos depends on what you already have

Merging videos means taking two or more separate video files and joining them into a single file in the order you choose. The easiest path depends on three things: what software is already on your computer, whether you need to edit between clips (trim, add transitions, adjust audio), and what format your videos are in.

If you have a Mac, iMovie is already installed and handles basic merging in minutes. On Windows, the Photos app does the same thing without downloading anything. If you want more control—trimming clips, adding fade effects between videos, or adjusting sound levels—you'll need video editing software like DaVinci Resolve (free) or Adobe Premiere Elements (paid). The built-in tools work fine if your clips are already the right length and you just need them in sequence.

Key Takeaways

  • Mac users can merge videos in iMovie without installing anything; Windows users can do the same in the Photos app.
  • If your video files are different formats or frame rates, converting them to the same format first prevents playback problems.
  • Merging takes just a few clicks once your clips are imported, but trimming, adding transitions, or adjusting audio requires a dedicated editor.
  • Export settings matter: choose the same resolution and frame rate as your original videos to avoid quality loss.

Merging videos on a Mac with iMovie

Open iMovie and create a new project. Click File, then New Movie. A blank timeline appears at the bottom of the screen. Drag your first video file from your computer into the timeline—it will snap into place as the opening clip.

Drag your second video into the timeline right after the first one. iMovie automatically places it at the end. Repeat for each additional video in the order you want them to appear. If a clip is too long, click it once to select it, then drag the edge inward to trim it. When all clips are in order and trimmed, click File and Share, then choose your export format (MP4 is standard). Name your file and click Save. The merged video will be ready in a few minutes depending on length and your computer's speed.

Merging videos on Windows with the Photos app

Open the Photos app (search for "Photos" in the Windows search bar). Click Create at the top, then select Video with music. Click New video project and give it a name. Click Add to import your first video file. The clip appears in the timeline at the bottom.

Click Add again and select your second video. It automatically places after the first one. Continue adding videos in the order you want them. To trim a clip, click it in the timeline, then drag the edges inward. When finished, click Export at the top right, choose your resolution (1080p is standard), and click Export as video. The merged file saves to your Videos folder.

Converting videos to the same format before merging

If your videos come from different cameras or phones, they may be in different formats—one might be MP4, another MOV, another WebM. Merging videos in different formats sometimes causes playback problems or forces the editor to convert them automatically, which takes extra time. Converting them all to the same format first prevents this.

Use a free converter like HandBrake (available for Mac and Windows). Open HandBrake, click Open Source, and select your first video. Under Summary, choose Format and select MP4. Click Start Encode. Repeat for each video. Once all videos are MP4 files, import them into iMovie or Photos and merge as normal. This step takes longer upfront but prevents errors during merging.

Using DaVinci Resolve for more control over transitions and audio

If you want to add fade effects between clips, adjust volume levels, or add background music, DaVinci Resolve is free and more powerful than the built-in tools. read it from Blackmagic Design's website and install it. Open DaVinci Resolve and create a new project.

Click the Media tab on the left, then click the folder icon to import your video files. Drag your first video into the timeline at the bottom. Drag your second video next to it. Repeat for all clips. To add a fade transition between two clips, right-click the space between them and select Add Transition, then choose Dissolve. To trim a clip, click it in the timeline and drag its edges. To adjust volume, click a clip and use the volume slider in the inspector panel on the right. When finished, click File, Export, choose MP4 format, and click Export.

Checking your video files before you start

Before merging, open each video file and note its resolution (1080p, 4K, 720p) and frame rate (usually 24, 30, or 60 frames per second). You can find this information by right-clicking the file, selecting Properties (Windows) or Get Info (Mac), and looking for video details. If all your videos match, merging will be seamless. If they don't match, the editor will convert them to match the first clip, which can reduce quality or cause stuttering.

If your videos have different resolutions or frame rates, convert them all to match before merging. Use HandBrake or a similar tool to set them all to the same resolution and frame rate. This takes extra time but ensures the final merged video plays smoothly without quality loss.

Exporting your merged video in the right format

When you export your merged video, you'll see options for format, resolution, and frame rate. Choose MP4 as your format—it plays on nearly every device and platform. For resolution, match your original videos: if they were 1080p, export at 1080p. If they were 4K, export at 4K. For frame rate, match the original as well (usually 30 fps).

Exporting takes time proportional to your video length and your computer's speed. A 10-minute merged video might take 5 to 15 minutes to export. Don't close the program or shut down your computer during export. Once finished, play the merged video in a media player to confirm all clips are in order, transitions work (if you added them), and audio is at the right level.

Frequently Asked Questions

Can I merge videos that are different sizes or resolutions?

Yes, but the editor will resize them to match the first clip's resolution. If your first video is 1080p and your second is 4K, the 4K video will be shrunk to 1080p, losing quality. Convert all videos to the same resolution before merging to avoid this.

What if the videos have different audio levels?

iMovie and Photos don't let you adjust individual audio levels. If one video is much louder than another, use DaVinci Resolve instead—click each clip in the timeline and adjust its volume slider in the inspector panel until they match.

How long does it take to merge videos?

Arranging clips in the timeline takes minutes. Exporting the final merged file takes longer—usually 5 to 20 minutes depending on total length and your computer's speed. A 30-minute merged video might take 15 to 30 minutes to export.

Can I undo the merge if I make a mistake?

Yes. In iMovie and Photos, click Edit and Undo, or press Ctrl+Z (Windows) or Command+Z (Mac). In DaVinci Resolve, use the same keyboard shortcuts. You can rearrange clips, remove clips, or start over without affecting your original video files.

What if my videos won't import into the editor?

The editor may not support that video format. Try converting the file to MP4 using HandBrake first, then import the converted file. If the video file is corrupted, try opening it in a media player to confirm it plays—if it doesn't, the file itself is damaged and cannot be merged.