🎬 Video Merger
Combine multiple videos into one — drag your clips into any order, mix different sizes and formats, and join them seamlessly. Free, private & no watermark, right in your browser.
Pick several clips, drag them into the order you want, and combine them into one video — all in your browser. Different resolutions are matched automatically, with no watermark.
Merge Videos the Easy Way
Combine clips of any size or format into a single clean video — without uploading a thing.
Join Any Clips
Combine 2+ videos into one file, even MP4, WebM and MOV mixed together.
Reorder Freely
Drag clips up or down into the exact order you want them to play.
Auto Size-Matching
Different resolutions and aspect ratios are matched on a shared canvas — no jumpy joins or stretching.
Smart Audio
Silent clips get a matching silent track grafted on so sound never drifts out of sync.
Visual Timeline
A live bar shows clip order and how much of the total each one takes up.
No Upload, No Watermark
Everything runs in your browser with ffmpeg — clean output, fully private.
How to Merge Videos
Four steps — everything happens on your device.
Add your clips
Drag and drop or choose two or more MP4, WebM or MOV files.
Set the order
Use the up/down arrows on each card; the timeline updates live.
Choose audio
Keep audio for sound, or uncheck it for a silent merge.
Merge & download
Press Merge, preview the joined video, and download — no watermark.
Frequently Asked Questions
Ordering clips, mixing formats and sizes, the silent-track fix, limits, privacy, speed and quality.
How do I merge videos together?
Drop two or more clips into the box, then use the up/down arrows on each card to set the order they should play. Choose whether to keep the audio, then press Merge. The combined video appears right there to preview and download — nothing is uploaded, and there's no watermark.
Can I combine videos that are different sizes or formats?
Yes — that's the main thing this tool handles for you. Clips of different resolutions, aspect ratios and frame rates are automatically matched to a common canvas (the largest size in your set, capped at 1080p) with letterboxing where needed, so the join is seamless instead of jumping or stretching. MP4, WebM and MOV all work.
What happens to clips that have no sound?
If you keep audio on and one of your clips is silent, the tool quietly grafts a matching silent track onto it. This matters more than it sounds: without it, joining a clip-with-sound to a clip-without-sound makes the audio and video drift out of sync. Handling it automatically is what keeps everything lined up.
Is there a limit on how many videos I can merge?
There's no hard limit, but because everything runs on your own device, very many or very long clips take longer and use more memory. For smooth results, merging a handful of clips at a time works best. You can always merge in batches and then merge the results.
Are my videos uploaded to a server?
No. The whole merge runs locally using ffmpeg compiled to WebAssembly — your clips never leave your browser, nothing is stored, and there's no watermark or sign-up. It even works offline once the engine has loaded.
Why does merging take a little while?
Combining clips of different sizes means each one is briefly re-encoded to a shared format so they fit together cleanly, then stitched. That re-encoding is the slow part, and it's happening on your device rather than a powerful server — the trade-off for keeping your footage private and free.
Will the quality drop?
Each clip is re-encoded once at a high-quality setting, so for normal footage the difference is invisible. The final stitch itself is a lossless copy, adding no extra quality loss on top.
Can I reorder or remove a clip after adding it?
Absolutely. Each clip is a card with up and down arrows to move it and an ✕ to remove it, and the timeline bar at the top updates live to show the new order and how long each clip runs. Set everything the way you want before pressing Merge.