Merge Videos
Join two or more MP4 clips into one video, losslessly when possible, right in your browser. Runs entirely in your browser, so your data never leaves your device.
Drop two or more videos here, or click to browse
Clips merge in queue order · never leave your device
Output
Queue your clips and press Merge; the combined video appears here.
Your videos never leave this tab
Merge Videos is JavaScript that your browser has already downloaded, and it does the whole job on your own machine. On a normal site, a 5 GB video means 5 GB uploaded, a wait in somebody's queue, and 480 MB downloaded again. Here it means 0 bytes up and 0 bytes down.
- No upload
- No file size limit
- Works offline once loaded
- Nothing stored or logged
How to use Merge Videos
- 1. Add the clips you want to join. Drop two or more .mp4 files onto the queue, or click to browse. Each clip is analyzed on the spot so the list shows its size and duration, and the files never leave your device.
- 2. Put them in the right order. Drag rows into place, or use the up and down arrows for precise moves. The number next to each clip is its position in the final video, and the footer keeps a running total of clips, size, and duration. Remove a clip with the x, or keep adding more.
- 3. Merge and download the combined video. Press the Merge button. The tool first tries a lossless join, which is instant and keeps the original quality; if the clips use different codecs or resolutions it re-encodes them into one consistent video instead. Preview the result and download merged.mp4.
When to use Merge Videos
Merge Videos joins several MP4 clips into a single file, entirely in your browser with no upload. When the clips come from the same camera or recorder it joins them losslessly in seconds; when they differ it re-encodes them into one consistent video. Use it whenever footage that belongs together is split across files.
- Rejoining a recording the camera split. Phones and action cameras cut long recordings into 4 GB chunks; queueing the parts in order rebuilds the full take without re-encoding or quality loss.
- Assembling clips into one video to share. A few short moments from an event are easier to send as one file than as a dozen attachments; drag them into order and merge them into a single highlight reel.
- Adding an intro and outro to a screen recording. Put a title clip before a product demo and a call to action after it, producing one polished video without opening a video editor.
- Combining recordings from different sources. A 1080p screen capture and a 720p webcam clip do not join losslessly, so the tool re-encodes them, fitting every clip into the first clip's frame with letterboxing where needed.
Examples
Stitch phone clips together
Input
intro.mp4 + main.mp4 + outro.mp4, dragged into order
Output
merged.mp4, joined losslessly in seconds
Combine mismatched recordings
Input
a 1080p screen recording + a 720p webcam clip
Output
one video, both clips fitted to the first clip's frame
About the Merge Videos tool
Merge Videos is a free online tool that works entirely inside your web browser. Join two or more MP4 clips into one video, losslessly when possible, right in your browser. Because the processing happens on your own device, nothing you enter is uploaded, logged or stored anywhere.
This page is one of 12 Video utilities on EditSafely. Each one does a single job well, and all of them follow the same rule: your input stays on your machine.
There is nothing to configure. Provide the input and the result appears on its own. The finished file is put together in browser memory and saved with the Download button, so it never touches a server on the way to your disk. 2 worked examples further down the page show exactly what the tool produces for real inputs.
Because nothing leaves your device, the tool is suitable for sensitive content such as internal documents, credentials or customer data. It also responds instantly, since every keystroke is handled on your own machine rather than by a remote API.
Frequently asked questions
Does Merge Videos cost anything?
Yes, it is completely free. All 2,671 tools on EditSafely work without an account, a subscription or usage limits.
Are my files uploaded to a server?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
Which files does Merge Videos accept?
It accepts MP4 videos. There is no file size cap imposed by a server; very large files are limited only by your device's memory.
Do I need to sign up or install anything?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
How do I save the output?
Click the Download button once the result is ready. The file is built in your browser's memory and handed straight to your downloads folder, without passing through a server.