Video tools
17 tools, all running in your browser
Compressing, trimming, converting, and making GIFs, done by your own browser. A clip of your family, a screen recording from work, or a video you have not posted yet stays on your device.
Change the video
Compress, trim, cut, merge, rotate, or mute it, add music, put two side by side, and see or remove the date and place it records.
- Compress videoMake a video smaller by quality or to fit a size limit, as an MP4.
- Video metadata viewerSee when, where, and on what a video was recorded, and remove it.
- Trim videoCut the start and end off a video, on the exact frames you choose.
- Cut out part of a videoRemove one or more sections from a video and join what is left.
- Merge videosJoin several clips into one MP4, in the order you choose.
- Mute videoTake the sound out of a video and keep the picture exactly as it was.
- Rotate videoTurn a sideways or upside-down video the right way up.
- Add audio to videoPut a song or a recording on a video, in place of its sound or mixed with it.
- Combine videos side by sideTwo clips playing at once in one frame, side by side or stacked.
Change the format
Move a video between MP4, MOV, WebM, and MKV, or make a GIF.
Why a video is the file you least want to upload#
A minute of 4K from a phone runs to a few hundred megabytes, so sending one to a converter means waiting for the upload before any work starts, and again for the download after. Here the file is read from your disk by the page itself, so the only wait is the conversion.
Videos are also personal in a way most files are not. They show faces, homes, and children, and a phone writes the place and time of recording into the file. Everything on these pages runs inside your browser tab, so the video is never sent anywhere, which you can check by watching the network panel stay empty while it works.
Copying the video, or encoding it again#
A video file is a container, such as MP4, MOV, or WebM, holding a picture track and a sound track, each compressed with a codec such as H.264, HEVC, VP9, or AAC. Changing the container alone is quick and loses nothing: an iPhone MOV already holds H.264 or HEVC, which an MP4 can hold too, so MOV to MP4 copies the tracks across in a second or two.
Shrinking a video, or changing its codec, means decoding every frame and compressing it again. That takes roughly as long as the video plays, often less on a recent computer, and loses a little detail each time, so work from the original rather than from a copy that has already been compressed. Every page here says which of the two it did.
What your browser can do with video#
These tools use WebCodecs, which lets a page decode and encode video with the same codecs the browser plays it with. Chrome, Edge, and current versions of Safari can read and write the common codecs. Firefox reads most of them, but on a Mac it cannot read HEVC, the codec iPhones record in, and it cannot make AAC sound. Each page checks what your browser can do before it starts, and names a browser that can when yours cannot.
Some formats no browser can read at all: AVI and WMV usually hold codecs from before the web had video, and ProRes is an editing format. Export those from the app that made them as MP4 first.
Frequently asked questions#
Are my videos uploaded?
#
No. Each tool reads the video in your browser tab, converts it there, and hands the result back as a download. Nothing is sent to a server at any point.
Is there a limit on video size or length?
#
No fixed one. The finished video is held in your browser tab until you save it, so the limit is the memory the tab can use. A few minutes of 4K is fine on a recent phone, and a desktop handles far longer. If a long video fails on a phone, try it on a computer.
How long does a conversion take?
#
Copying the tracks into a new container, as MOV to MP4 usually does, takes a second or two whatever the length. Re-encoding, which compressing and changing codec need, runs at about the speed the video plays or faster, depending on your device and the resolution.
Can I convert AVI, WMV, or MKV files?
#
MKV opens when the codecs inside it are ones your browser reads, which most MKV files from a screen recorder are, and MKV to MP4 copies the H.264 or HEVC video in one into an MP4 unchanged. AVI and WMV files usually hold codecs no browser can decode, so they cannot be converted here.