Local developer utility

Video Merger

Reorder and join video clips with normalized dimensions and audio. Your input stays in your browser while you work.

Video Merger🔒 Processed locally

Arrange clips in playback order

MP4, WebM, MOV and other formats supported by the local engine.

100 MB per file · Five minutes combined · First use downloads about 31 MB of processing code

Fit within the selected canvas, preserving proportions and padding empty space with black.

Processing uses your device and can be slower than playback. Shorter clips work best on mobile. Unsupported codecs produce an error; no server fallback is used.

How to use Video Merger

Choose one or more local files above, enter any requested options, then run the action. The generated file appears with its own download control.

Processing runs locally in this browser. No input is uploaded or sent to a conversion service.

Video is processed in a local browser worker. MP4/WebM exports and short GIF clips are supported; input codec support varies. Up to 100 MB per file, 150 MB total and five minutes combined. The processing engine downloads from this site on first use; your files are not uploaded.

Inputs

Choose local files using the file picker.

Related tools

Video Compressor — Compress video locally and keep the original if the result would be larger.
Video Converter — Convert local video files to MP4 or WebM directly in your browser.
Video Trimmer — Cut a video to a selected start and end time without uploading it.
Video to Audio — Extract a video soundtrack as MP3 or WAV locally.