Resize video online
Change the frame your video lives in — 16:9 to 9:16, landscape to square, or any size you type. The interesting part is what happens to the footage that no longer fits, and you get to choose.
Your video never leaves your device. There is no upload, no queue and no server copy. Free, with no sign-up, no watermark and no export limit.
What you can do
Presets for every platform
Instagram Reels and posts, TikTok, YouTube and Shorts, Facebook, LinkedIn and X, all at the pixel sizes each one actually wants.
Three ways to fill the frame
Crop to fill and reposition by hand; fit with a solid colour behind; or fit with a blurred, scaled copy of the video itself.
Any custom size
Type a width and height. Dimensions are kept even, because H.264 cannot encode an odd one.
Reframe, do not just letterbox
When you crop to fill you can slide the picture inside the new frame, so the subject stays in shot.
How to resize video online
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1
Add your video
Drag it in. The canvas starts at the source’s own size.
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2
Pick a size
Choose a platform preset or type your own width and height.
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3
Choose how it fills
Crop, fit with a colour, or blurred background — then nudge the framing until it looks right.
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4
Export
Download the resized MP4.
Handles clips up to 3 minutes, 1080p and 300 MB.
Questions
What size should a video be for Instagram Reels?
1080 × 1920 — a 9:16 portrait frame. The same size works for TikTok, YouTube Shorts and Facebook Stories, which is why one export usually covers all four.
How do I turn a landscape video into a portrait one?
Set the canvas to 1080 × 1920 and pick a fill mode. "Crop to fill" keeps the picture sharp but loses the sides; "blurred background" keeps the whole picture and fills the gaps with a blurred copy of itself.
Will resizing make my video blurry?
Making it smaller will not. Making it larger than the source stretches the pixels you already have, so it will look softer — that is true of every tool, not just this one.
Does resizing reduce the file size?
Usually yes, because there are fewer pixels to encode. If you want to hit a specific file size, set a lower resolution and a lower quality together.
Can I resize without cropping anything out?
Yes. Choose "Fit with bars" or "Blurred background" — both keep the entire picture and fill the leftover space rather than cutting into it.
Related tools
Ready when you are
Free, with no sign-up, no watermark and no export limit. Your video never leaves your device. There is no upload, no queue and no server copy.
Open Video Studio