Merge Videos — Combine Multiple Video Files into One

Join multiple video files into a single continuous video. Drag to reorder, then merge — all processing happens locally in your browser.

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.

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.

Supported formats

	Formats
Input	MP4, WebM, MKV
Output	MP4, WebM, MKV

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.

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.

Related tools

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.