Merge Videos Online Free — No Watermark, No Upload, Combine MP4 Clips into One
Drop two or more videos here
or click to choose (MP4, MOV, WebM… — you can add more later)
processed in your browser · never uploaded
Joins clips into one MP4 in your browser — no watermark, no size limit, nothing uploaded.
A free online video merger for joining the clips you shot separately on your phone, stitching screen recordings together, or lining up several clips into one file — no editor to install, nothing uploaded. Drop two or more videos, reorder them with the arrows, remove any with ✕, and press Merge. The output takes the first clip's size; clips with a different size or aspect ratio are padded (black bars), cropped or stretched to fit. Everything is re-encoded to H.264/AAC MP4, so mixing MP4, MOV and WebM or different resolutions and frame rates is no problem. Clips without audio get silence inserted so later audio stays in sync. The key difference from typical online mergers: your videos never leave your device. Everything runs locally via WebCodecs, so multi-GB sources have no upload wait, and there is no account, watermark or clip limit. Processing time scales with the total length and resolution. A recent Chrome or Edge is recommended.
How to use
- Drop in two or more video files (you can add more later).
- Arrange them with the arrows and choose how to fit clips of a different size (pad / crop / stretch).
- Press “Merge”, then download the single MP4.
FAQ
Are my videos uploaded?
No. Loading, merging and exporting all happen inside your browser on your device — nothing is sent to or stored on a server. That's why there is no upload wait and no size or clip limit.
Can I merge videos of different sizes or orientations?
Yes. The output uses the first clip's size; other clips are padded (kept whole with black bars), cropped (filled, edges trimmed) or stretched (aspect ignored). When mixing portrait and landscape, put a clip of the orientation you want first and pick pad or crop.
Does it lower the quality? Can it merge without re-encoding?
All clips are re-encoded to H.264/AAC so that different formats, resolutions and frame rates join reliably. A high-quality setting is used, so the difference is normally invisible, but it is not lossless. For identical-format clips you want joined losslessly, a desktop editor's stream-copy concatenation is the tool.
Will audio drift if some clips have no sound?
No. Silence is inserted for clips without audio so the next clip's sound starts at the right time. Audio with a different sample rate is resampled to 48 kHz.
Which formats, how many clips, and how long does it take?
Input: MP4, MOV, WebM, MKV and other formats your browser can read, with no clip limit. Output: H.264/AAC MP4 (WebM in browsers that can't encode H.264). Time scales with total length and resolution; with hardware encoding it is often faster than real time.