Clips into one continuous MP4 — mixed sizes and formats handled, merged on your own device.
Two or more clips — mixed sizes and formats are fine · merged on your device, nothing is uploaded
No size limit · files are processed on your device and never uploaded · how it works
Runs in your browser. Files are never uploaded — you can go offline after the page loads.
How to use the Merge Videos
Drop two or more clips — mixed sizes and formats are fine.
Arrange with ↑↓ — the list order is the play order.
Merge, preview the result in the page, download one MP4.
Easy to use
Drop files, pick options, download. Whole folders at once, no signup, no daily limit.
Best quality
The same engines the professionals use — SVGO, resvg, MozJPEG, libwebp, libavif — compiled to run in your browser.
Private & secure
Files are processed on your device and never uploaded. Close the tab and nothing remains anywhere.
Merging done honestly
Two clips can only play as one when they agree on size, frame rate and audio format — which phone clips, screen
recordings and downloads never do. Tools that pretend otherwise produce stutters and audio drift at the joins. This
merger normalises every clip to a common 720p/30 frame (letterboxed, never stretched), resamples the audio, and
concatenates cleanly — a merge that plays right everywhere, from any mix of inputs.
Everything runs on FFmpeg in your browser at about the combined length of the clips — the price of your videos
never touching a server. Trim each clip first (lossless, instant) so you merge only the
parts you keep, and compress the result if it needs to travel by chat.
Frequently asked questions
Why does the output become 720p?
Because merging honestly requires one common format — clips of different sizes and frame rates cannot be butted together raw. Everything is normalised to 1280×720 at 30 fps (letterboxed, never stretched), which merges any mix reliably and suits sharing. Clips already alike merge cleanly at that spec too.
How long does it take?
About the combined length of the clips — the encoder runs on one core in your browser. The trade: none of your videos ever upload anywhere.
Most online converters upload your file to a server. InfyTool ships the actual encoders to your browser as WebAssembly instead, so processing happens inside your tab — faster for batches, and nothing to delete afterwards.
No upload, ever. Turn off Wi-Fi after the page loads and every tool keeps working.
No limits. No file-size cap, no queue, no watermark, no account.
Runs on your CPU. Batches use several cores in parallel; nothing is throttled.