Join two or more video clips into one file without uploading them anywhere. This concat video editor runs entirely in your browser: drop your MP4 or WebM clips, put them in order, and merge. No sign-up, no watermark, and your files never leave your device.
100% local processing · no upload · no watermark
Drop video clips here, or click to choose files
MP4, WebM — anything your browser plays · up to 20 clips · files never leave your device
Most online video joiners upload your footage to a server. This one doesn't — and that changes everything else about it.
Clips are concatenated locally with the canvas and WebAudio APIs built into your browser. Nothing is transmitted, stored or reviewed by anyone, which makes it safe for unreleased or client footage.
No account, no email, no trial limits. Because merging runs on your own device, there is no server cost to pass on to you — the tool is free the way a calculator app is free.
The merged file you download is exactly what your clips add up to — clean video, your audio, no logo burned into the corner and no forced outro.
AI video models like Veo 3.1, Seedance and Hailuo return short 5–15 second clips. Generate several, download them, and stitch them into one longer video here — this is the fastest scene-by-scene workflow for AI footage.
Every clip shows a thumbnail, duration and resolution before you merge, and you can reorder the list until the story reads right. Mixed resolutions are letterboxed automatically.
Merged output keeps your clips' resolution up to 1920×1080 and is re-encoded at a high bitrate, so the result looks like your source footage, not a compressed preview.
From separate clips to one downloadable file, without leaving the page.
Drag and drop your video files onto the tool above, or click to pick them. MP4 and WebM both work; add up to 20 clips per merge.
Use the arrows to move each clip up or down the list. Check the thumbnails and durations — the merged video plays clips top to bottom.
Press Merge videos. The editor plays through your clips once to record the combined file — watch the progress bar — then download your MP4.
Common questions about merging and joining videos online.
Yes — completely free, with no sign-up, no watermark and no clip limit beyond 20 files per merge. The merging happens on your own device using standard browser APIs, so there are no server costs behind the tool.
No. Unlike most online video joiners, nothing is transmitted anywhere. Your clips are read locally, decoded in your browser and re-encoded into one file that is saved straight back to your device. The page works even if you go offline after loading it.
Anything your browser can play: MP4 (H.264) and WebM are the most common. The merged file is saved as MP4 in Chrome, Edge and Safari, and as WebM in Firefox — both formats upload fine to YouTube, TikTok, Instagram and most editors.
The editor records the combined video in real time as it plays through your clips — that is the trade-off for doing everything locally with zero upload. A 60-second merge takes about a minute. Server-based tools are faster only because they upload your footage first.
There is a single re-encode at a high bitrate (up to ~8 Mbps at 1080p), which is visually indistinguishable from typical source footage. Generation after generation of re-encoding is what degrades quality — one pass does not.
Yes, and that is exactly what many visitors use it for. Generate a few short clips with Veo 3.1, Seedance or Hailuo on this site, download them, then concat them here into one longer video — a scene-by-scene workflow that is much cheaper than generating one long clip.
Generate short AI videos with Veo 3.1, Seedance or Hailuo — free credits on sign-up — then come back and merge them into one video.