A free video converter that turns MOV, MKV, WebM, MP4 and GIF files into MP4, WebM, MOV or GIF, in your browser, with nothing uploaded.
Drop any video, pick MP4, WebM, MOV or GIF, and convert it in this browser. MOV and MKV copy into MP4 in a moment.
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The video and sound are copied into the new format as they are, when it takes them: nothing is lost, and it takes a moment. Otherwise they're re-encoded to look the same.
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Add a video to convert.
Everything happens in this browser, with its own video encoders, so your videos never leave your computer. There's no size limit but your computer's memory.
This free video converter turns any video into MP4, WebM, MOV or GIF, in your browser. It reads MOV, MKV, WebM and MP4, and GIFs too.
When the new format takes your video as it is, it's copied in a moment with nothing lost. Otherwise it's re-encoded to look the same, and nothing is uploaded.
Here's which format to pick, when a conversion is instant, and how it compares with CloudConvert.
TL;DRKey takeaways
What is a video converter?
A video converter turns a video file from one format into another, like MOV into MP4, so it plays or uploads where you need it.
A video file is a box, the format, holding the picture and the sound, each in its own codec. Converting changes the box, and the codecs only when the new box needs it.
Which format to pick
Each format is right for a different place:
- What it is
- H.264 video and AAC sound, the format everything plays
- Use it for
- Phones, computers, TVs, social media and every site
- What it is
- VP9 video and Opus sound, the web's own format
- Use it for
- Videos on web pages
- What it is
- Apple's QuickTime format
- Use it for
- Final Cut Pro, iMovie and QuickTime
- What it is
- A loop of up to 256 colors, with no sound
- Use it for
- Chats, slides and emails
When in doubt, pick MP4. It's the one every phone, player and site takes.
When it's instant
A MOV from an iPhone and an MKV from OBS hold H.264 or HEVC video, which MP4 takes as it is. So "Same quality, instant" copies them into an MP4 in a moment, with nothing lost.
A WebM holds VP9 video, which MP4 players don't expect, so it's re-encoded. The file list tells you which way each video will go before you convert.
- What it does
- Copies the video and sound into the new format, when it takes them
- Use it for
- MOV or MKV to MP4, with nothing lost
- What it does
- Re-encodes to H.264 and AAC, looking the same
- Use it for
- A file an old player or a site won't open
- What it does
- Fewer bits a second, still sharp
- Use it for
- Sharing and uploading
- What it does
- Fewer still, a little soft in fast motion
- Use it for
- Sending in a chat
- What it does
- Compresses to the size you set
- Use it for
- An email or an upload with a limit
Compared with CloudConvert
I ran the same 10-second files through this converter and through CloudConvert, a popular online converter, on September 30, 2026. The score is how alike the result looks to the original, where 1 is identical:
- This converter
- Under a second, copied, nothing lost. Or 2 s re-encoded to H.264, score 0.990
- CloudConvert
- 6.6 s with the upload, re-encoded, score 0.993
- This converter
- Under a second, copied, nothing lost
- CloudConvert
- 6.1 s with the upload, re-encoded, score 0.990
- This converter
- About 1 s, score 0.992
- CloudConvert
- 2.8 s with the upload, score 0.991
- This converter
- About 1 s, 995 KB
- CloudConvert
- 5.6 s with the upload, 1,430 KB
CloudConvert's servers re-encode with x264, the best H.264 encoder, so its files came out about a quarter smaller at a similar score. This converter uses your device's own encoder, copies when it can, and never uploads your video.
Nothing is uploaded
Most online converters send your video to their server and send back the result. This one converts in your browser, with the video encoders built into it.
So your video never leaves your computer, there's no upload to wait for, and there's no size limit but your computer's memory.
What it can't convert
Some files don't work in a browser:
- Old formats – AVI, WMV and FLV aren't read. MP4, MOV, MKV, WebM, Ogg and GIF are.
- Some sound codecs – a camera's AC-3 or DTS sound can't be decoded in most browsers.
- Copy-protected videos – videos from streaming apps are locked.
- Very long 4K videos – they work, but a phone may run out of memory.
For those, convert on a computer rather than a phone.
Who is the video converter for?
It's for anyone who records, edits or posts video:
- Video resizer – creators posting one video to TikTok, Reels and YouTube
- Video caption generator – anyone adding captions before posting
- Screen recorder – people recording tutorials and demos
- MP4 to MP3 converter – podcasters turning video into an audio feed
Teachers, marketers and support teams use it for the one file that won't open.
More free video tools
Here are my other video converters, and two for what comes next:
- Compress video – smaller videos, or a size you set
- MOV to MP4 – iPhone and Mac videos that play everywhere
- WebM to MP4 – browser recordings that play everywhere
- MKV to MP4 – OBS recordings, instantly
- Video to GIF – a short loop for chats and slides
- GIF to MP4 – a GIF as a video, a fraction of the size
- Video resizer – any video in TikTok, Reels or YouTube's size
- MP4 to MP3 converter – just a video's sound
They're all free, in your browser, with no watermark.
Video converter FAQs
Questions about the video converter? Here's what to know.
A video converter turns a video from one format into another, like MOV into MP4.
This one reads MOV, MKV, WebM, MP4 and GIF, and makes MP4, WebM, MOV or GIF.
MP4 with H.264 video is the one every phone, player and site takes.
Pick WebM for web pages, MOV for Apple's editing apps, and GIF for short loops.
When the new format takes the video and sound as they are, they're copied instead of re-encoded.
MOV and MKV to MP4 usually work that way.
Copying keeps it exactly.
Re-encoding keeps it close: 0.99 on a scale where 1 is identical, in my test.
Yes, the video converter is free, with no account, no watermark and no limit on files.
It runs in your browser, so it costs nothing to run.
No, the video converter converts your videos in your browser.
They never leave your computer.
I did.
I'm Navid Moazzez, and the video converter is one of my free tools on navid.me.
Read more about me.
Navid Moazzez
AI business strategist & AI OS builder
Navid Moazzez helps creators and founders master AI and build their own AI Operating System (AI OS) to automate their business and life.
Navid.me is reader-supported. When you buy through links on this site, I may earn an affiliate commission. Learn more.
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