Join videos into one, free.
Add several clips, put them in order, and merge them into a single MP4 — all in your browser, so the videos never leave your device.
How to join videos into one
- Add your clips. Drop or choose several MP4, MOV or WebM files — they load in your browser and are never uploaded.
- Put them in order. Use ↑ / ↓ to set the sequence and × to remove a clip.
- Join & download. Click Join; the clips are merged into a single MP4 and saved to your device.
Why join videos in your browser
Stitching clips together normally means uploading them to a site or installing an editor. Here the whole join happens on your own device, so nothing is uploaded — which matters when the footage is personal, unreleased or just large. There is no account, no watermark stamped across the result, and no queue: you add clips, order them, and get one MP4 back.
Because the clips are genuinely re-encoded into a single video (not just played back-to-back), the result is one clean file that plays anywhere — not a playlist. Different sources with different sizes, frame rates and codecs all end up as one consistent MP4.
Getting a clean join
The output is sized to fit your largest clip, and any clip with a different shape is letterboxed — fit inside the frame with black bars — so nothing is stretched or distorted. For the tidiest result, use clips that share an aspect ratio. Each clip keeps its own audio, lined up with its section; a clip with no sound simply plays silent while the rest stays in sync.
The join runs in real time on your device — a two-minute result takes about two minutes to build — so keep the tab open and in the foreground while it works, and expect long or high-resolution joins to be heavier on older machines. TrackMix only works with clips your browser can play, which keeps everything private and off any server.
Frequently asked questions (5)
Is the video joiner free?
Yes — completely free, with no sign-up, no watermarks, and nothing uploaded; clips up to about 600 MB each are supported in the browser.
Do my videos get uploaded?
No. The clips are joined entirely in your browser, so your video never leaves your device.
Can I join clips with different sizes or formats?
Yes. The clips are re-encoded into one MP4 sized to fit your largest clip; anything with a different shape is letterboxed — fit with black bars — so nothing is stretched.
Will the joined video keep its audio?
Yes — each clip's audio is kept and lined up with its section. If a clip has no audio, that part is silent so everything after it stays in sync.
How many clips can I join, and how long can they be?
As many as you like, up to about 900 MB of video in total. It re-encodes in real time on your device, so long joins take a while — keep the tab open and in the foreground while it runs.