Online MP4 Joiner
Merge as many MP4 files as you want right in your web browser. Add transitions between clips, edit them on the timeline, and export when you're ready.
Over 1 million creators use Flixier every day including brands like:
How to Join MP4 Videos
Merge and Edit MP4s in One Place
Drag and Drop Clips
Rearranging your sequence is as simple as dragging clips into a new position on the timeline. There’s no need to re-upload or start over if you change your mind about the order.
Match Aspect Ratio Across Clips
Adjust the aspect ratio of individual clips so mismatched footage lines up cleanly once merged. Get vertical phone clips and widescreen recordings looking the same with one click.
Preview Before Exporting
Play back your combined clips on the timeline before exporting, so you can catch pacing issues or out of order clips before exporting.
Edit Your Video As You Go
Crop, split, or change the aspect ratio of your clips to fit whichever platform you're publishing to. Flixier's MP4 editor covers all of this without needing a separate tool.
Everything you need to create
and finish AI videos
Why Use Flixier to Join MP4 Clips
Skip the App Install
Merge your MP4 files entirely in your browser, without downloading and installing any heavy software on your computer.
Adjust Audio While Merging
Having trouble with uneven audio on your MP4s? Flixier allows you to balance volume levels on individual clips and add music tracks if you want too.
Combine More Than MP4s
Use Flixier to combine images, audio, and video together, so you're not limited to merging one file format at a time.
Publish Directly to Socials
Export your merged video and publish it straight to YouTube, TikTok, or Instagram, without having to save and re-upload.
Unlike any tool
you've used before
“I have over 11 years in the broadcast industry, building teleproductive facilities, using high-end editing equipment. And this is better than anything else I've used in my lifetime.”
Still have questions?
We got you!
How do I join MP4 files online for free?
Open Flixier in your browser, drag your video files onto the timeline, and arrange them in the order you want. Once everything's in place, click Export and have Flixier render them into a single video.
Can I add transitions between MP4 clips?
Yes. Flixier has a built-in library of transitions you can drag and drop between clips, so your merged video moves smoothly from one to the next instead of cutting abruptly.
Does joining MP4 files reduce quality?
No. Flixier processes your files in cloud servers, so the output keeps the same visual clarity as your original clips. Nothing is compressed and there’s no quality loss in the process.
What is the maximum number of MP4 files I can merge?
There's no set limit. You can upload and merge as many MP4 files as you need in a single project, which makes Flixier a good fit for building longer montages. However, the free plan is limited to 2GB of storage and 10 minutes of exports per month, so you might want to consider upgrading to another pricing plan if you need more than that.
Can I trim MP4 clips before merging?
Yes. Select any clip on the timeline and either cut out the part you don't want, or drag the edge of the clip to trim it before you export.
