Resize a video, free
Change your video's resolution or aspect ratio — 1080p, 720p, square, 9:16 story format — entirely in your browser, with no upload.
Drop your video here, or choose a file
Up to 500 MB, up to 10 minutes. The footage stays in your browser — we never upload it.
It works on a phone, but noticeably more slowly: the encoding runs on your own device's processor. For longer videos a desktop is quicker.
Resolution or aspect ratio — which one do you need?
They are not the same thing, and most of the frustration comes from confusing them. Resolution is how many pixels the picture is made of: a 1920×1080 recording scaled to 720p shows exactly the same thing with a quarter of the pixels, so the file is smaller and it uploads faster. Aspect ratio is the SHAPE of the picture: a 16:9 landscape clip only fits a square or a 9:16 portrait frame if you sacrifice something.
That is why the tool asks when you change the aspect ratio. “Crop” throws away the edges of the picture and fills the new frame completely — the right choice when what matters is in the middle. “Blurred backdrop” keeps the whole frame and fills the space left over with an enlarged, blurred copy of itself — the usual Instagram and TikTok answer. “Black bars” is the same thing, unadorned.
Which size for which platform?
Portrait 9:16 is the format of Instagram Reels, TikTok and YouTube Shorts — it fills a phone screen. 4:5 takes up the most room in the Instagram feed without cropping the picture. Square 1:1 is the old feed standard and is still the safest choice when you do not know where the video will end up. 16:9 is the default for YouTube, Vimeo and every monitor.
For resolution, 720p is the sensible default: on a phone it is practically indistinguishable from 1080p, and the file is half the size. 480p is useful when the video has to get through email or chat — but if size is the actual goal, the video compressor works to an exact size limit.
Frequently asked questions
Can I enlarge the video?
No, and that is deliberate. “Enlarging” a 640×360 recording to 1080p means making more pixels out of the same detail: the file gets bigger, the picture gets no sharper — only blurrier. So if the original is smaller than the size you picked, we keep the original and tell you.
Does resizing hurt the quality?
Resizing means re-encoding, so one generation of compression loss is unavoidable. We encode at CRF 23, which on live-action footage is practically invisible. The audio is re-encoded to AAC at 128 kbps.
My portrait phone video shows up as landscape. Is that a problem?
No — the sizing is based on the frame YOU see, not on the way it happens to be stored in the file. Phones write the rotation as a separate piece of data, and this tool takes it into account exactly as your player does. If the rotation itself is the problem, the video rotator is the tool for it.
What file do I get?
H.264 video and AAC audio in an MP4 with a fast-start header — even if the original was MOV, WebM or MKV. Every phone, browser and social platform accepts that combination.
Need a specific file size? Compress the video to a size limit.