Merge videos online
Merge multiple video clips into one file in your browser. Concatenate MP4 and MOV instantly. 100% secure — processed 100% on your device, no upload.
Drop video clips to merge
Add 2 or more clips — MP4, MOV, AVI, MKV, WEBM
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Resize video for vertical paid ads without re-uploading client masters
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How to merge multiple video clips
Add two or more video clips using drag and drop or the file picker. Clips appear in the order you add them — use the same format and codec for best results with fast stream copy.
Click "Merge videos" to concatenate all clips into a single MP4. FFmpeg WASM runs the concat demuxer locally without sending files to a server.
Processed 100% on your device — no files are uploaded to any server. Track progress with the live bar and download your merged video when complete.
Why choose SnapKit? Our tools are 100% Private, No Server Upload, Instant Browser-Based, with No File Size Limit — plus free ringtone and video makers. Whether you merge PDFs, convert HEIC photos, or trim MP4 clips, your files stay on your device with zero cloud storage.
Why choose SnapKit?
Every tool is built around four promises: privacy, speed, freedom, and accessibility. No cloud pipeline — just your browser and your files.
100% Private — No Server Upload
Files are processed on your device with client-side WebAssembly and Canvas. No bytes are sent to our servers.
Instant Browser-Based speed
Skip slow uploads and downloads. Your CPU and GPU do the work locally for near-instant results.
No File Size Limit — Free forever
No registration walls, no watermarks, and no arbitrary caps. Use ringtone, video, PDF, and image tools freely.
Works on every device
iPhone, Android, Windows, and Mac browsers are all supported with the same private, instant experience.
Frequently asked questions
Can I merge MP4 videos online for free?
Yes. Add your clips, click Merge videos, and download a single MP4. The joiner runs in your browser with FFmpeg WASM. Processed 100% on your device — no files are uploaded to any server.
Is merging videos in the browser private?
Yes. This is a 100% secure, browser-based tool. Your clips never leave your device — no cloud storage, no account, and no server processing.
Do merged clips need the same format?
For fastest merging without re-encoding, use clips with the same resolution and codec (e.g. all MP4 H.264). Mixed formats may require re-encoding in other tools.
Is my data safe with this tool?
Yes. All processing runs 100% on your device using client-side WebAssembly, Canvas API, and browser APIs. No bytes from your files are transmitted to our servers — zero server upload, absolute privacy.
Why is the processing speed so fast?
Because your file never leaves your browser. SnapKit uses WebAssembly and Canvas to harness your device CPU and GPU directly, skipping slow network upload and download steps.