Merge Videos Online
Combine multiple videos into one file. Supports MP4, WebM, MOV, and AVI. Free, private, and entirely browser-based. Your files never leave your device.
Drop files here or browse
Supports MP4, WebM, MOV, AVI - up to 10 files, 50 MB each
Tips for merging videos
Lossless merge when possible
If all input videos share the same format and codec, the tool merges them without re-encoding for a lossless result.
Format conversion when needed
If input videos have different codecs, the tool re-encodes to H.264 + AAC MP4 for maximum compatibility.
Large files supported
Each video can be up to 500 MB. Merge up to 10 videos at once. Processing speed depends on your device.
Privacy first
All merging happens in your browser using WebAssembly. Your video files are never uploaded anywhere.
Reorder before merging
Add files in the order you want them to appear in the final video. The list shows the merge order.
How to merge videos online for free
Whether you need to combine video clips from different recordings, join scenes from the same event, or merge screen recordings into a single tutorial, this free video merger makes it easy. The browser-based tool processes everything locally, so your video files are never uploaded to any server.
The merger uses FFmpeg WebAssembly to handle the concat operation. If all input videos share the same codec and container format, the merge is done with stream copy for a lossless result. If the videos have different codecs, the tool re-encodes them to H.264 + AAC in an MP4 container for maximum compatibility.
Each input video can be up to 500 MB, and you can merge up to 10 videos at once. The first merge requires a one-time download of the video engine (~30 MB), after which subsequent merges start immediately. The output is always MP4 format for broad device and platform compatibility.
Frequently asked questions
How do I merge videos?
Upload multiple videos using the drop zone, arrange them in the order you want (top to bottom), then click Merge Videos. Download the result when processing is complete.
Is my video uploaded to a server?
No. All merging happens locally in your browser using WebAssembly (FFmpeg.wasm). Your files never leave your device.
What video formats are supported?
The merger supports MP4, WebM, MOV, and AVI input formats. The output is always MP4 (H.264 + AAC) for maximum compatibility.
Can I merge videos with different formats?
Yes. If the input videos have different codecs, the tool automatically re-encodes them to H.264 + AAC MP4 before merging.
Is there a file size limit?
Each video can be up to 500 MB, and you can merge up to 10 videos at once. Larger files take longer to process depending on your device.
Will merging reduce video quality?
If all input videos share the same codec and container format, the merge is lossless (stream copy). If re-encoding is required, the tool uses high-quality settings (CRF 23) to minimize quality loss.