Free browser-based media tool
Combine several clips into a single video. When every clip shares the same codec and resolution, the join uses stream copy and adds little extra load; mixed sources are re-encoded to match the first clip.
Best for joining phone clips into one video, stitching separately recorded segments, or recombining parts of a file that was split earlier.
Merge video online for free with no watermarks. Join MP4, MOV, WebM and MKV clips in your browser: matching clips are joined with stream copy, mismatched ones are re-encoded to match the first clip.
Yes, the video merger is free to use. There is no registration required, no login needed, and no subscription fees, and the merged output carries no watermark. The practical limit is your browser memory, since the clips you join are held in your device's RAM while the engine works.
Step 1: Add two or more clips to the input area — you can select them in one go or add them one by one. Step 2: Check the order of the list; clips are joined in the order shown, so drag or move an entry if it is out of place. Step 3: Leave the mode on Fast Join (stream copy) if all clips come from the same source, or switch to Unified Re-encode if they do not. Step 4: Click '🚀 Start Processing' and wait for the single joined file to appear in the output gallery.
Fast join copies the existing compressed stream instead of decoding frames, so when all clips share the same codec, resolution, frame rate and audio parameters, the work is mostly file copying. When the parameters differ, stream copy is no longer reliable — and it does not always announce that. ffmpeg can finish with a success code while the muxer drops the frames it cannot place on a monotonic timeline, leaving a file that opens fine but goes wrong partway through. This tool therefore probes every clip before a fast join and switches to Unified Re-encode as soon as the parameters disagree. That path decodes all clips together and costs more CPU and memory, but it is the one that stays correct.
With stream copy the video data is moved without being re-compressed, so the joined result keeps the quality of the input clips. Unified Re-encode decodes and encodes again, which is a lossy step for H.264/H.265 output; how visible that is depends on the bitrate you choose and on the source footage.