filetity

VIDEO + VIDEO -> ONE · Local tool

Merge Video

Combine several video clips into one, in the order you choose.

Last updated

How do I merge video files into one?

Drop the clips onto filetity's video merger, put them in the order you want with the arrows on each row, check the preview under each one, and merge. They are written end to end with no gap and no crossfade, in exactly the order shown. Formats can be mixed freely: MP4, MOV and WebM all decode on the way in, and the result is always an MP4. Clips at different resolutions are fitted to the largest width and height among them, with letterboxing rather than cropping, because upscaling a smaller clip costs bytes and loses nothing while cropping a bigger one throws its picture away. If every clip has audio, the merged file does too; if even one is silent, the merged file has no audio at all rather than a silent gap under a continuous picture. Everything happens in the browser tab with nothing uploaded.

  1. 01 / Your device

    the file stays here

  2. 02 / Browser memory

    the work runs locally

  3. 03 / Back to you

    saved on this device

When you would use this

Situations, not settings.

Several phone clips from one event
A birthday or a match recorded in three separate clips because the phone paused between them. Dropped in the order they happened and merged into the one file worth sending.
A screen recording split by a length cap
Some recorders cut a long capture into parts on their own. Rejoined here in the order they were made, so a walkthrough plays as one continuous video again.
A title clip or an end card around the footage
A short intro, the real recording, then a closing card, exported as three separate files. Merged into the single upload a platform actually wants.

How it works / no cloud

A conversion engine, not an upload form.

Each clip is decoded frame by frame and drawn onto one canvas sized to the largest width and height among the files, which becomes the merged track; a mismatched frame is letterboxed to fit rather than cropped or stretched. Audio is decoded the same way the audio joiner does it and written alongside, only when every clip has a track. Only one frame and one moment of audio are held in memory at a time, whatever the number of files or their length.

  • Offline ready
  • Installable app
  • No file limit queue

Straight answers

No accordion. Nothing hidden.

Is it free?
Yes, with no watermark and no page limit.
Does it need an account?
No. There is no account system.
Is my file processed on my device?
Yes. The file is read by your browser and never uploaded. There is no server to send it to.
What formats are supported?
MP4, MOV and WebM in, mixed freely. MP4 (H.264 and AAC) out.
What are the limits?
Clips are joined end to end with no gap and no crossfade. Different resolutions are fitted to the largest without cropping; if even one clip has no audio, the merged file has none, since a silent stretch under the picture would be a worse result than no sound at all.
Does it work on mobile?
Yes, on any modern mobile browser. Large files are limited by the memory the phone gives the browser.
Does it work offline?
Yes, after you have used it once. Your browser keeps what the tool needs, so it then works with no network connection.
What if my clips are different resolutions?
The merged video is sized to the largest width and largest height among the clips you gave, and anything smaller is letterboxed to fit rather than cropped or stretched, because upscaling a smaller clip costs bytes and loses nothing while cropping a bigger one throws its picture away.
Can I control the order?
That is the point of the list. Clips arrive in whatever order the picker handed them over, which is rarely the order you want, so each row has arrows to move it, a preview to confirm it is the right clip, and the merge follows the list exactly as shown.
What happens to the audio?
It merges alongside the picture when every clip has an audio track. If even one clip is silent, the whole merged file comes out with no audio, because a silent gap under a continuous picture reads as broken in a way a wholly silent video does not. Split the silent clip out and merge the rest to keep their sound.
Is there a gap or a crossfade between clips?
Neither. Each clip starts exactly where the previous one ends. A pause has to already be in the footage, and a crossfade needs a real editor that can overlap two clips in time, which this is not.
Can I mix formats, like an MP4 and a MOV, in one merge?
Yes. Every clip is decoded on the way in regardless of its container or codec, so what they arrived as makes no difference to the result, which is always one MP4.

Keep working locally

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