Video Merger
Join several clips into one video, in order, on your device — no upload.
About this tool
Add clips in order, remove any you don't want, press merge: they play back to back while the browser records one continuous video. Download as WebM. Nothing is uploaded.
How joining works without a server
Concatenating video files properly means matching codecs, resolutions and timestamps — which is why desktop tools re-encode, and why online merger sites upload your clips to do it. The on-device equivalent is honest and simple: every clip is drawn into one canvas at the first clip's size (letterboxed if a later clip has a different shape), played in sequence at full speed, and recorded as a single stream with the audio mixed in where the browser allows. A five-minute result takes five minutes and comes out as WebM (MP4 conversion where supported). Typical jobs: the three parts of a screen recording that split at a pause, phone clips from the same event, an intro or title card in front of a talk. Practical advice: trim each piece first so you only record what belongs, put the clip with the shape you want first, and keep the batch under about twenty minutes on a phone. For transitions, titles or overlays between clips, a proper editor is the right tool; the watermark tool can brand the merged result afterwards.
Frequently asked questions
Do the clips need to be the same size?
No — later clips are fitted into the first clip's frame and letterboxed if their shapes differ. Put the clip with the shape you want first.
Is the sound kept?
Yes, mixed into the recording wherever the browser supports routing element audio (modern browsers do).
How long does merging take?
As long as the combined clips play — recording is real time. Trim the pieces first.
Why WebM?
Browsers can record WebM everywhere but not MP4. It plays in every browser and modern player; convert with the MP4 tool if an app insists.