Merge Videos into One MP4

Join video clips in a chosen order. Normalize them to a common 16:9 size and 24 fps, keep or remove audio, and download one MP4.

Open workspace Free to use · No signup

01Add your videos
02Adjust & preview
03Export your result

All video tools

Video workspace FFmpeg-powered

Video stays on your device. The editing engine downloads from a CDN when first used.

Choose video clips or drop them hereMP4 / WebM / MOV and other FFmpeg-supported formats · Device memory limits apply

Preview uses browser-supported codecs. The FFmpeg engine may accept additional file types.

Export settings

Output width Include audio (all clips must have audio)

Clips normalize to 16:9 at 24 fps before a fast final join. This can be slow for long inputs.

Choose a video to begin.

Download result

FFmpeg diagnostics and export command

If export fails, copy these details. The last stderr messages usually explain the cause. Do not paste private filenames if sensitive.

Logs will appear when export starts.

Merging needs at least two usable clips and sufficient memory for intermediate outputs. Inputs are staged one at a time, but that does not guarantee large-file support. Mixed audio-stream layouts can fail or produce unexpected sound; inspect the result or retry without audio. No transitions are added.

When to use this tool

Assemble related demonstrations or recording segments into one video. Arrange the clips in reading order before export and check each join for continuity.

How to use Merge Videos into One MP4

Choose at least two clips. Add more files if needed, and use the list controls to reorder or remove clips.
Choose the common output width and whether to retain available audio.
Export the combined MP4 and check the clip order, borders and audio around each join.

Supported video formats and output

Accepts supported video containers including MP4, MOV, WebM, MKV, AVI and M4V. Each clip is normalized to H.264 MP4 at 24 fps on a 16:9 canvas, with padding where needed. The normalized clips are joined into one MP4.

Limits and quality

Local processing and engine downloads

The application processes selected media in this browser. The FFmpeg engine and workers load from a third-party CDN when first needed; those requests disclose ordinary connection information. Keep the original files and check your downloaded result. Export needs JavaScript, WebAssembly and worker support.

Frequently asked questions

Can I change the clip order?

Yes. Use the move-up and move-down controls in the selected clip list before exporting.

Will different aspect ratios fill the screen?

The tool fits clips inside a common 16:9 canvas and pads unused space rather than stretching the picture.