Resize any video for any platform.

Name: Rescroll
Availability: InStock
Rating: 5 (1 reviews)
Author: Rescroll

Turn a video into 9:16 for TikTok and Reels, 1:1 or 4:5 for the feed, or 16:9 for YouTube. Free, full quality, no watermark, and nothing leaves your device.

100% free
No watermark
No sign-up
Full quality
Files stay on your device

Drop your video here

MP4, MOV or WebM, any size. You'll see the new shape before anything is made.

Choose a file

Processed on your device. Nothing is uploaded.

Loading the tool…

It runs in your browser. Nothing is uploaded.

How it works

How to resize a video, free, in three steps.

1
Drop in your video
Any MP4, MOV or WebM: a YouTube export, a phone video, a screen recording. It opens in your browser; nothing is uploaded.
2
Choose the shape and the fill
9:16 for TikTok, Reels and Shorts, 1:1 or 4:5 for the feed, 16:9 for YouTube. Keep the whole picture with a blurred fill or plain bars around it, or crop it to fill the frame and slide the crop where you want it.
3
Download the resized MP4
At 1080p, or up to 4K when your video has the detail for it. No watermark, and the sound is copied across untouched.

Why this one

Free, with nothing held back, and nothing uploaded.

Every platform's shape

9:16 (1080×1920) for TikTok, Instagram Reels, YouTube Shorts and Stories; 1:1 and 4:5 for Instagram and Facebook posts; 16:9 (1920×1080) for YouTube.

Blurred fill, not black bars

The whole picture stays in view, with a soft blurred copy of itself filling the space around it: the look you see on most reposted clips. Plain bars and full-frame crops are one click away.

Crop where it matters

Cropping a wide video to vertical? Slide the crop left or right to keep the speaker or the action in frame, and see it in the preview before you export.

Full quality, no watermark

The picture is drawn once at the new size and encoded at high quality; the sound isn't touched. Nothing is added: no logo, no watermark.

Your file is opened and processed by your own browser. It is never sent to a server, so it stays private, and there’s no upload to wait for.

Resizing a video for social media

Every platform wants its own shape. YouTube plays wide 16:9 video; TikTok, Reels and Shorts play tall 9:16; Instagram's feed favors 4:5 and 1:1. A video in the wrong shape plays small, with black bars, or gets cropped by the app in ways you didn't choose.

A video resizer changes the frame itself. This one gives you three ways to do it: the whole picture with a blurred copy behind it, the whole picture with plain bars, or a crop that fills the frame, which you can slide to keep what matters in view. The preview shows exactly what you'll get.

Ready-made versions of the video resizer

Horizontal to vertical

Make a 16:9 video fit TikTok, Reels and Shorts at 9:16, with a blurred fill or a crop.

Vertical to horizontal

Put a 9:16 phone video in a 16:9 frame for YouTube or a TV, with a blurred fill at the sides.

Square video converter

Make any video a 1080×1080 square for Instagram, Facebook and LinkedIn feeds.

Rescroll

Resizing is step one of repurposing.

Rescroll turns one long video into posts for every platform: it finds the best moments, reframes them vertically around the speaker, adds captions and gets each one ready to publish.

Finds the best clips in a long video
Reframes around whoever is talking
Captions and motion graphics on every clip

Try Rescroll See the AI video editor

Questions

The video resizer: your questions, answered.

How do I change a video's aspect ratio for free?

Drop the video on this page, choose the shape (9:16, 1:1, 4:5 or 16:9) and how to fill it, check the preview and download the MP4. It's free, adds no watermark and doesn't upload your video.

What size is a vertical video for TikTok, Reels and Shorts?

1080 × 1920 pixels, an aspect ratio of 9:16. All three play vertical video full screen at that shape, and it's what this tool makes when you choose 9:16.

Should I crop or add a blurred background?

Crop when the important part sits in one area of the frame, like one person talking: it fills the screen and looks native. Use the blurred background when everything in the wide frame matters, like a screen recording or a group shot, so nothing is cut off.

Does resizing lower the quality?

Changing a video's shape means re-encoding it, and this tool does that at a high quality setting. Making a picture bigger than it was can't add detail, so a 720p video stretched to fill a 1080p frame will look as soft as the original.

Is this video resizer really free?

Yes. There's no price, no trial, no account and no limit on how many files you do. The video resizer runs on your own device, in your browser, so it costs us nothing to run and we don't charge for it.

Does it add a watermark?

No. The file you download has no watermark, no logo and no intro or outro added. It's your file, changed only in the way you asked.

Is my video uploaded anywhere?

No. The file is opened and processed by your browser, on your device, and never sent to a server: not to us, not to anyone. You can check: watch the Network tab of your browser's developer tools while it works, and you'll see the file is never sent anywhere.

How big a file can it handle?

There's no file size limit of ours. Files of several gigabytes work, because the file is read from your disk as it's needed rather than loaded all at once. What sets the pace is your device: a long 4K video takes longer on an older laptop than on a new one.

Which browsers does it work in?

Current versions of Chrome, Edge and Safari, and Firefox on a computer: any browser with the WebCodecs API for encoding video and sound. Some files, like iPhone HEVC video, need Chrome, Edge or Safari to decode. A computer is much faster than a phone for long videos.

Where to go next.

AI video editor

The whole edit from a sentence: silences and bad takes cut, captions, color, zooms and graphics.

AI motion graphics

Counters, charts, app screens and maps designed from a description, on your own video.

All free tools

Video and audio tools, and 48 motion graphics generators. All free, all in your browser.