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The video merger is a Professional feature. Upgrade your plan to access it.
The Video Downloader Plus video merger combines multiple video files into a single continuous output. Add your files, drag to set the order, choose an output format, and merge — everything runs locally in your browser.

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How to merge videos

1

Open the tool

Go to vidow.io/tools/merge.
2

Add video files

Click Add videos and select multiple files, or drag them onto the page. You can add files from multiple sources.
3

Drag to reorder

Drag the video clips into the order they should appear in the final output.
4

Choose output format

Select your preferred output container format.
5

Merge

Click Merge. Processing runs entirely in your browser — no data is uploaded.
6

Download

Download the merged video file when processing is complete.

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Supported formats

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Notes on compatibility

For best results, input files should share the same codec, resolution, and frame rate. When the tool detects incompatible files, it re-encodes them to a common format before merging — this takes longer but always produces a valid output.

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How it works

Merging runs locally in your browser using a WebAssembly build of FFmpeg. When input files are compatible, the merger concatenates them directly without re-encoding for fast, lossless results. Re-encoding is applied automatically when needed. No data is sent to any server.

Video Trimmer

Trim individual clips before merging them.

Add Audio

Add a background track or narration to the merged video.

Video Compressor

Reduce the file size of the merged output.