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Merge Videos

Merge Videos joins several clips — even in different formats or resolutions — into a single continuous file. Reorder them however you like and the tool normalizes everything to a common size and frame rate so the result plays back smoothly from start to finish.

01

Add your video

The file is read by your browser and stays on your device — there is no upload step.

Merge videos

Add clips, drag the order with the arrows, and export one file. Mixed formats and resolutions are matched automatically.

02

Your video

The work runs in this tab. Nothing is sent anywhere, and the download is generated locally.

Add 2+ clips

How to use Merge Videos

  1. 01
    Upload

    Add your clips

    Drop in two or more videos. Each one is listed with a thumbnail and duration.

  2. 02
    Customize

    Set the order

    Rearrange the clips with the up and down controls until the sequence is right.

  3. 03
    Process

    Merge & download

    Export to combine them into one MP4, MOV or WEBM and download the finished video.

Building the combined clip

  1. 01
    Add your clips

    Drop in every file that belongs in the finished video.

  2. 02
    Set the running order

    Arrange them into sequence. This is the edit — there is no timeline to rearrange afterwards.

  3. 03
    Check the joins

    Cuts between clips are instant. Where two shots are very similar the join can read as a glitch rather than an edit.

  4. 04
    Export

    One continuous video is rendered in the order you set.

When the clips do not match

  • Different resolutions

    Clips must share one output size, so anything that differs is scaled to fit. Mixing 4K and 720p means the 720p sections look noticeably softer.

  • Different frame rates

    A 30fps clip placed among 60fps footage has to be conformed, which can introduce slight judder on motion.

  • Different loudness

    The most noticeable mismatch of all. Clips recorded on different days will jump in volume at every join unless levelled first.

Worth checking first

  • Trim each clip before merging — Removing dead air is far easier per clip than hunting for it in a long combined file.

  • Orientation — One portrait clip among landscape footage will be pillarboxed. Rotate or crop it first.

  • Audio levels — Normalise the clips that are obviously quieter, or the finished video will make people reach for the volume.

Supported formats

  • MP4
  • MOV
  • WebM
  • AVI
  • MKV
Maximum file size —
bounded by your device's memory
Processed by —
FFmpeg (WebAssembly), on your device

Your file, and what the page does

Your file is never uploaded. Merge Videos reads it into this browser tab and processes it with FFmpeg compiled to WebAssembly on your own device. There is no upload endpoint in the application and no copy on any server — closing the tab discards it.

That is also why processing takes longer here than on a site that uploads: your device is doing the work rather than a rack of servers. The trade is that the file never leaves it.

What the page does send or fetch

The processing engine, once
The first time you use any video or audio tool, the browser downloads the FFmpeg WebAssembly build (~30MB) from the jsDelivr CDN and reuses the cached copy afterwards. That is a file coming to you — no part of your own file is in the request.
Ads on the page
The site is funded by advertising, so the page loads Google AdSense. That carries the usual web basics — IP address, browser, referring page — as on any ad-supported site.
An anonymous usage counter
When Merge Videos finishes we record that the tool ran, whether it succeeded and how long it took. No file data, no identifier, no cookie.

Your file is not on that list. How this works.

Frequently asked questions

Yes. Clips are scaled and letterboxed into a shared canvas, so mixed resolutions combine without distortion.

A silent track is generated for clips without sound so the audio and video stay aligned across the join.

There is no fixed limit on the number of clips. The combined size is the real constraint, since every clip is held in memory while the merge runs.

Yes — Merge Videos is completely free. There's no account, sign-up, watermark or limit.

No. It runs in any modern browser — Chrome, Edge, Safari, Firefox, Brave — with nothing to download or install.

Not sure merging is what you need?

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