When merging is the right move
A few obvious cases: an interview cut into Q&A chunks that needs to be one deliverable, a screen recording that auto-split into chunks because the recorder hit a duration limit, b-roll plus the main take that should ship as a single video, or multiple speakers each recorded separately on their own machine. The browser tool now normalizes clips before joining them, so ordinary MP4 files keep playing after the first segment and retain audio in later segments.
How it works under the hood
We use FFmpeg's concat demuxer after first re-encoding each clip to a common H.264/AAC shape. That costs more time than stream-copying, but it avoids the common broken output where only the first MP4 segment plays or later audio disappears.
When you need a desktop tool instead
If your clips are very large, very long, or came from high-bitrate cameras, browser-side FFmpeg can run into memory limits. You can pre-convert one-clip-at-a-time with our WebM → MP4 converter or MOV → MP4 converter and then merge — or skip the browser memory ceiling entirely and use HandBrake, FFmpeg locally, or a video editor on your machine. For mixed-source merges at scale, desktop is faster.
Recording in chunks on purpose?
If you're recording a long session and worried about losing it all to a crash, chunked recording is sensible — but the easier path is a recorder designed for long sessions to begin with. Clipy handles long takes natively, ships you a sharable link without an upload-step round trip, and never asks for a signup on the viewer side. Use this merge tool to tidy up after the fact; use Clipy if you'd rather not need to merge.