Super Boring Tools

Search tools

Find a tool by name or what it does.

Video Merger

Join two or more video clips into one MP4, in the order you choose. Mixed formats and orientations line up automatically.

Video clips
Drop video clips here or click to browse
or paste from clipboard (Ctrl+V) · MP4, MOV, WebM, MKV, AVI
Files stay in your browser. Nothing is uploaded.

Merging re-encodes every clip to one format so mixed sources always play. The first clip sets the frame; other clips are scaled and padded to fit, at 30 fps. This is the heaviest job on the site: a few short phone clips take a couple of minutes, and long footage is best merged in a desktop browser.

How to merge videos online

  1. Add your clips

    Drag two or more video files onto the drop zone or click to browse. MP4, MOV, WebM, MKV, and AVI can be mixed in one merge.

  2. Put them in order

    Use the up and down controls to arrange the clips from first to last; the merged video plays top to bottom, and the first clip sets the frame size.

  3. Merge and wait

    Click Merge videos. Each clip is prepared in turn and then joined, and the progress bar reports every stage.

  4. Preview and download

    Check the result in the player, then download the merged file as one MP4.

Why use this tool

Mixed formats and orientations

MP4, MOV, WebM, MKV, and AVI clips can go into one merge. Every clip is conformed to the first clip's frame, scaled to fit and padded where the shape differs, so portrait and landscape sources line up.

Exact order without dragging

Up and down controls move each clip precisely, which works just as well on a touch screen as with a mouse. Remove any clip from the list with one click.

Silent clips handled

A clip with no audio track gets a silent one during the merge, so a muted screen recording never breaks the join or knocks the sound out of sync.

One standard MP4 out

The merged file is always H.264 video with AAC audio at 30 fps, the combination that plays on phones, browsers, TVs, and editors without extra codecs.

Nothing leaves your browser

The whole merge runs on your device. Clips are never uploaded, stored, or logged anywhere.

Free with no watermark

No account, no branding on the output, and no cap on how many merges you run.

About this tool

This tool merges two or more video clips into a single MP4, entirely in your browser. Add MP4, MOV, WebM, MKV, and AVI files in any combination, put them in order with the up and down controls, and download one continuous video. Before joining, every clip is re-encoded to a common format: H.264 video with AAC audio at 30 fps, sized to the first clip's frame. Clips with a different shape are scaled to fit and padded, clips without sound get a silent audio track, and that is why mixed sources merge cleanly instead of producing a file that stalls partway through.

Typical jobs include stitching phone clips from a trip into one video, combining separate screen recording takes into a single walkthrough, and assembling event footage shot by several people. The first clip sets the frame for the whole video, so lead with the clip whose size and orientation you want the result to keep. If a clip needs tightening first, trim it before merging, and if the finished file comes out large, the video compressor can shrink it afterwards.

Merging is the heaviest job on this site because every clip is re-encoded before the join. A few short phone clips take a couple of minutes; long footage takes correspondingly longer and is more comfortable in a desktop browser than on a phone. In exchange, nothing is uploaded at any point, so family videos, work recordings, and unreleased footage stay on your device. Audio files get the same treatment in the audio joiner, and documents in PDF merge.

Frequently asked questions

How do I control the order of the clips?
The list order is the playback order: the clip at the top plays first and the clip at the bottom plays last. Use the up and down controls next to each clip to rearrange, and the remove control to drop a clip from the merge.
Can I merge videos with different sizes or orientations?
Yes. Every clip is re-encoded to match the first clip in the list: clips with a different shape are scaled to fit inside that frame and padded with bars where the aspect ratio differs. Put the clip whose size and orientation you want the result to keep at the top of the list.
Does merging reduce video quality?
Merging re-encodes every clip once, because that is what makes clips with different formats, frame rates, and sizes join reliably. The output is H.264 video with AAC audio at 30 fps at a quality level chosen for the web; for typical phone clips and screen recordings the difference is hard to spot. Clips larger than the first clip's frame are scaled down, which is where any visible loss would come from.
How long does merging take?
Merging is the heaviest job on this site because every clip is re-encoded before the join. A few short phone clips take a couple of minutes; long or high resolution footage takes correspondingly longer and is best done in a desktop browser. The first run also downloads the video engine once per session.
What happens to clips that have no sound?
Clips without an audio track get a silent one during the merge, so the joined video keeps one continuous soundtrack instead of failing or falling out of sync. Clips that already have sound keep it.
Are my videos uploaded anywhere?
No. The clips are read, re-encoded, and joined entirely inside your browser, and the merged file is saved straight to your device. Your footage never leaves your machine.

Related tools