Private browser tool

Video Merger

Place one MP4 directly after another and download a combined video without re-encoding.

No uploadNo accountFree to use

✓ Runs locally in your browser

↥Choose or drop a filevideo/mp4, .mp4 · up to 500 MB

🔒 Your media file is never uploaded to Voysum.

Private by default

Useful conversion without giving up your file.

Compatible tracks are joined without full video re-encoding.

The original encoded streams are preserved.

Videos remain in browser memory throughout the merge.

Common questions

How local browser processing works and what to expect.

Which videos can be merged?

For stream-copy merging, both MP4 files should use matching codecs, resolution, frame rate, and audio layout.

What if the files are different?

Use the resize or conversion tools first so their technical properties match.

Keep working

Extract audio from video locally in your browser. Your file is never uploaded.

Convert MP4 video to MP3 locally in your browser with no file upload.

Convert WAV to MP3 privately in your browser. No upload, signup, or payment.

Need the words too?

Voysum can transcribe the converted recording and create subtitle files.