Free Video Merger
Concatenate multiple videos into one — no re-encode when codecs match. Drag to reorder, preview, export MP4. Browser-based, no upload.
Why Do This in Your Browser?
Joining several video clips into one is conceptually the simplest video edit there is — and yet most online tools insist on re-encoding the result, which takes minutes and degrades quality slightly. FFmpeg's concat demuxer can stream-copy clips together in seconds when they share a codec and container, with zero re-encoding.
This tool does exactly that. Drop in multiple videos, drag to reorder, click Merge. When the clips share the same codec (the most common case if they all came from the same phone or camera), the merge is a stream copy — fast and bit-exact. When codecs differ, the tool transcodes the misfits to match the longest clip's codec, then concatenates.
How It Works
Stream-copy concat works by reading the bitstream of each video sequentially and writing it to a new container. No decode, no encode — every byte is preserved. The output is identical to manually splicing the source files in a hex editor (but obviously safer).
When the input clips have different codecs, resolutions, or framerates, the tool falls back to a transcode-then-concat pipeline. All clips get normalized to the dominant codec (H.264) at the dominant resolution and 30fps. This takes longer but is necessary — direct concatenation of mismatched streams produces broken playback.
Tip: Pair the Video Trimmer with the merger to build multi-cut edits — trim each segment, then merge. If your clips have mismatched codecs, run the odd ones through the Video Converter first to avoid a slow transcode-then-concat path.
Common Use Cases
How We Compare
Honest read on free, paid, and self-hosted options for this kind of job: