How do I merge videos into one file for free?

Add 2 to 10 clips, put them in order with the arrow buttons in the file list, pick 720p or 1080p, then press Merge videos. Every clip is normalised to matching settings and then joined, and the result downloads as a single MP4. Nothing is uploaded.

Can I merge clips with different formats and resolutions?

Yes — that is the whole point of the two-stage process. Mixed MP4, MOV, WebM, AVI and MKV clips at different resolutions and frame rates all work, because each one is first re-encoded to identical settings before anything is joined. Files that differ cannot be concatenated directly.

Will portrait and landscape clips look right together?

They will play correctly but not look seamless. Every clip is fitted inside the chosen frame and padded rather than stretched, so nothing is distorted — but a portrait clip in a 1080p landscape output gets wide black bars either side. Mix orientations only when you are happy with that.

What frame rate does the output use?

Everything is normalised to 30 fps, which is what makes clips from different cameras join without stuttering at the joins. It does mean a 60 fps clip is halved, so smooth slow-motion footage will look slightly less fluid in the merged file than it did on its own.

Should I pick 720p or 1080p?

720p is the default and is faster to encode and smaller to store, which suits social clips and anything watched on a phone. Choose 1080p when your source clips are genuinely 1080p or higher and the result is going on a large screen — it will not add detail to 720p sources.

What if one of my clips has no audio?

It is handled automatically. If a clip has no audio track, a silent one is generated for it during normalisation, which keeps everything in sync. Without that, joining a silent clip to clips with sound is the classic cause of audio drifting out of step partway through.

Will merging reduce quality?

Each clip goes through one re-encode during normalisation, at a high quality setting. The joining step itself is a stream copy, so there is no second generation of compression. In practice one careful re-encode is visually hard to spot, but it is not lossless.

How long does it take?

Roughly the total playing time of all your clips combined, because each one has to be re-encoded. Encoding runs on a single CPU thread with no GPU acceleration, so keep the tab in the foreground — background tabs get throttled by the browser and the job crawls.

Merge Videos

Merge and join multiple video files into one online free — concatenate MP4 clips in your browser. No upload required — instant, private, in-browser.

Files never leave your deviceInstant — no upload waitFree, no sign-up

Choose videos or drag & drop them here2–10 clips — mixed formats are fine, joined on your device

or import from

Merge videos into one file — 2 to 10 clips, in any mix of formats and resolutions. Each clip is normalised so they join cleanly, then combined into a single MP4. Runs entirely in your browser with FFmpeg compiled to WebAssembly: no upload, no sign-up, no watermark.

Why mixed clips need two stages

Videos can only be joined directly if they share the same codec, resolution, frame rate and audio format. Clips from a phone, a screen recorder and a download almost never do, which is why naive tools either refuse them or produce a file that breaks at the first join.

So this works in two passes. First every clip is re-encoded to identical settings — your chosen resolution, 30 fps, H.264 video and AAC stereo audio at 44.1 kHz. Then those matched pieces arejoined with a stream copy, so the joining step itself adds no further compression. One re-encode total, not two.

What normalisation does to your clips

Every clip is brought to these settings before joining.
Property	Result	What to watch for
Resolution	720p or 1080p, your choice	720p is the default
Aspect ratio	Fitted and padded, never stretched	Mixed orientations get black bars
Frame rate	Forced to 30 fps	60 fps footage is halved
Video codec	H.264	One generation of compression
Audio	AAC, 44.1 kHz, stereo, 128 kbps	Mono sources become stereo
Silent clips	Given a generated silent track	Prevents audio drifting out of sync
Container	Always MP4 out	Plays everywhere

Two rows deserve attention before you commit to an encode. The 30 fps normalisation is what makes clips from different cameras join without a visible hitch, but it halves 60 fps footage — if you shot smooth slow motion, it will be slightly less fluid in the merge than it was on its own.

And padding rather than stretching is the right default, since nobody wants a distorted face, but it is worth picturing the result. A portrait phone clip inside a 1080p landscape frame keeps its shape and gains wide black bars either side. If your clips are all portrait, that is fine on its own; mixing orientations in one timeline is what produces an awkward-looking file.

Order matters, and it is set before you press merge

Add your clips — 2 to 10, added in one go or several. Each is listed with its size.
Set the sequence with the arrow buttons in the file list. The list order is the playback order, top to bottom.
Pick the resolution. 720p unless your sources are genuinely 1080p or better.
Press Merge videos and keep the tab in the foreground. Progress reports which clip is being prepared.

Expect the job to take roughly the total playing time of all your clips, because every one of them is re-encoded. Trimming before merging is therefore the single best way to save time — cutting dead air out of three clips with trim video first is faster than merging everything and cutting afterwards, and trim has a lossless mode.

How this compares to the alternatives

Joining several clips.
	ToolJiffy	Typical online merger	Desktop editor
Clips uploaded to a server	No	Yes, all of them	No
Mixed formats accepted	Yes	Often refused	Yes
Clip limit	2–10, 500MB each	Commonly 2–3 free	None practical
Watermark	Never	Very common on free tiers	No
Transitions between clips	No — hard cuts only	Sometimes	Yes
Speed	Total clip length, one CPU thread	Fast server-side	Fastest, all cores
Price	Free, unlimited	Free tier then paid	Free to paid

Note the transitions row. Clips are joined as hard cuts — there are no crossfades or wipes. For a simple compilation that is usually what you want; for anything requiring a fade between scenes, fade video can soften the ends of a clip before you merge it.

Frequently Asked Questions

How do I merge videos into one file for free?
Add 2 to 10 clips, put them in order with the arrow buttons in the file list, pick 720p or 1080p, then press Merge videos. Every clip is normalised to matching settings and then joined, and the result downloads as a single MP4. Nothing is uploaded.
Can I merge clips with different formats and resolutions?
Yes — that is the whole point of the two-stage process. Mixed MP4, MOV, WebM, AVI and MKV clips at different resolutions and frame rates all work, because each one is first re-encoded to identical settings before anything is joined. Files that differ cannot be concatenated directly.
Will portrait and landscape clips look right together?
They will play correctly but not look seamless. Every clip is fitted inside the chosen frame and padded rather than stretched, so nothing is distorted — but a portrait clip in a 1080p landscape output gets wide black bars either side. Mix orientations only when you are happy with that.
What frame rate does the output use?
Everything is normalised to 30 fps, which is what makes clips from different cameras join without stuttering at the joins. It does mean a 60 fps clip is halved, so smooth slow-motion footage will look slightly less fluid in the merged file than it did on its own.
Should I pick 720p or 1080p?
720p is the default and is faster to encode and smaller to store, which suits social clips and anything watched on a phone. Choose 1080p when your source clips are genuinely 1080p or higher and the result is going on a large screen — it will not add detail to 720p sources.
What if one of my clips has no audio?
It is handled automatically. If a clip has no audio track, a silent one is generated for it during normalisation, which keeps everything in sync. Without that, joining a silent clip to clips with sound is the classic cause of audio drifting out of step partway through.
Will merging reduce quality?
Each clip goes through one re-encode during normalisation, at a high quality setting. The joining step itself is a stream copy, so there is no second generation of compression. In practice one careful re-encode is visually hard to spot, but it is not lossless.
How long does it take?
Roughly the total playing time of all your clips combined, because each one has to be re-encoded. Encoding runs on a single CPU thread with no GPU acceleration, so keep the tab in the foreground — background tabs get throttled by the browser and the job crawls.