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One page for every "convert to MP4"
You usually do not care what your file started as — you just want an MP4 that plays for whoever you are about to send it to. That is exactly what this page is for. Drop a screen recording your colleague saved as .mkv, a phone clip that came out as .3gp, an old .wmv from a Windows machine, or a .webm your browser handed you, and you get back the same universal H.264 + AAC MP4 every time. If you would rather start from a page tuned to your exact input, jump to WebM to MP4, MOV to MP4, MKV to MP4, or AVI to MP4.
Where MP4 matters most
The compatibility gap shows up the moment you leave the app that created the file. iMessage and Safari are fussy about anything that is not H.264 MP4. Windows Media Player chokes on half the open formats. Every social platform — X, LinkedIn, Instagram, TikTok — expects MP4 on upload. Converting once, up front, saves you from a stranger replying "it won't play" later. Need to shrink the result afterward? Run it through the video compressor, or browse the full video converter hub.
Skip the convert step entirely
If you are converting because your recorder hands you an awkward format, Clipy records straight to shareable, universally-playable video with no watermark and no signup wall — so there is nothing to convert afterward. It is the free screen recorder these tools were built to support.
Why MP4 is the format to convert to
MP4 (ISO/IEC 14496-14) is the universal video container. With H.264 video and AAC audio inside — exactly what this tool produces — it plays natively in every browser, every phone, every smart TV, and on every social platform that takes a video upload. Other formats are great in their own niche: WebM for in-browser playback, MKV for archival flexibility, MOV for the Apple ecosystem, AVI for legacy Windows tooling. But the moment you want a clip to "just play" for anyone, on anything, you convert it to MP4.
Why we always re-encode
Some converters try to remux — copy the existing video stream into an MP4 wrapper without touching it. That is faster, but it only works when the source codec is already MP4-compatible, and it silently fails on the odd containers people actually have: VP9 inside WebM, an old DivX AVI, a phone-camera .3gp, a screen-capture .ts. We take the slower, reliable path and re-encode every input to H.264 + AAC. The trade is a few seconds of processing for the guarantee that whatever you drop in comes out as a standard MP4 that plays everywhere.
Need a specific source format?
This is the head-term page that handles anything. If you already know what you are starting from, the dedicated pages have format-specific notes and FAQs: WebM to MP4, MOV to MP4, MKV to MP4, and AVI to MP4. And the video converter hub lists every format-to-format tool in one place.