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🇬🇧WebFileTools/Merge Videos

100% local processing — your data never leaves your device.

Merge Multiple Videos

Combine your clips into one MP4. Reorder files and pick output resolution. 100% browser-based.

Local proof

Proof of local processing

This tool is classified as local in the WebFileTools registry: processing is expected to stay inside your browser.

See transparency page
  • •The page is declared as local in the public tool catalog.
  • •No server-side storage is announced for this processing flow.
  • •The easiest verification is to monitor the Network panel while it runs.

How to verify it yourself

  1. 1Open your browser developer tools and switch to the Network panel.
  2. 2Run the processing flow with a test file.
  3. 3Confirm that no upload request containing your file is sent to WebFileTools.

You use this tool often? Pro includes files up to 500 MB and priority processing.

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What is Merge Videos?

Local video merger: concatenate multiple files into one MP4 with H.264 re-encode.

How to use this tool?

Add your videos, reorder them, choose output resolution, then download the merged MP4.

Benefits

  • Multi-file
  • Reorderable list
  • Optional 1080p / 720p
  • Nothing uploaded
  • FFmpeg.wasm

Frequently Asked Questions

Are my videos uploaded to a server?
No. Merging runs entirely in your browser via FFmpeg.wasm.
Can I merge different formats?
Yes. The tool re-encodes to H.264 + AAC for a compatible MP4 even when sources differ in codec or resolution.
How do I control clip order?
Use the up/down arrows to reorder the list before merging.

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