Change a video’s resolution, or fit it into a square, portrait or vertical frame. Free, and nothing is uploaded.
Sometimes a video is the wrong size. A 4K phone recording is too heavy to send, a landscape clip looks tiny as a Reel, or a website asks for 720p. This tool lets you resize video online in two ways: lower or raise the resolution while keeping the shape, or fit the video into an exact frame for social media. It works as a free video resizer online in Chrome, Edge, Safari and Firefox, on a computer or a phone. You can resize video online free, with no watermark and no account, and the file is never uploaded: all the work happens in your browser, on your own device. If you mainly need a smaller file in MB rather than a new resolution, the video compressor is the better tool, and this page explains the difference below.
The tool decodes every frame, scales it to the new size and encodes it again (H.264 for MP4, MOV and MKV, VP9 for WebM) at a balanced quality setting. The sound is kept. There are two kinds of size:
Worked example: in our own test (24 October 2026, Chrome on a desktop) the 9:16 story option produced a video of exactly 1080×1920. Computed with the keep-shape formula, a 1920×1080 video at 480p becomes 1920 × 480 ÷ 1080 = 853.3, rounded to the even number 854, so 854×480.
Click the box or drag the file onto it. You see the file name, size and a preview.
720p is selected by default. Choose 1080p, 480p or 360p to keep the shape, or a 1:1, 4:5, 9:16 or 16:9 frame.
A progress bar shows how far it has got. MP4 is the default; open More options to pick MOV, MKV or WebM.
Click Download to save the resized video. The result card shows the size before and after.
Scale your video to 1080p, 720p, 480p or 360p. The shape of the video stays the same, so nothing is stretched.
Fit any video into 1:1 (1080×1080), 4:5 (1080×1350), 9:16 (1080×1920) or 16:9 (1920×1080).
With the frame sizes the whole video is fitted inside and the spare space is filled with black bars. Your picture is never cropped.
Resizing happens in your browser on your own device. No sign-up, no watermark and no limit.
The 1080p, 720p, 480p and 360p options change the resolution without stretching or black bars. The table shows what you get for three common video shapes, computed from the formula above.
| Option | Landscape 1920×1080 | Vertical 1080×1920 | 4:3 1440×1080 |
|---|---|---|---|
| 1080p | 1920×1080 | 1080×1920 | 1440×1080 |
| 720p | 1280×720 | 720×1280 | 960×720 |
| 480p | 854×480 | 480×854 | 640×480 |
| 360p | 640×360 | 360×640 | 480×360 |
Fewer pixels means less work for the encoder and, usually, a smaller file. The chart shows how much of the 1080p picture is left at each option.
Apps often crop or zoom a video that does not match their frame, which can cut off faces or text. Resizing to the right frame first means you decide how it looks. The frame options give an exact size and fit your whole video inside. The table shows how much of the frame your picture fills; the rest is black bars.
| Option | Size | Landscape 16:9 video fills | Vertical 9:16 video fills | Often used for |
|---|---|---|---|---|
| 1:1 | 1080×1080 | 56% (bars above and below) | 56% (bars at the sides) | Square feed posts |
| 4:5 | 1080×1350 | 45% | 70% | Portrait feed posts |
| 9:16 | 1080×1920 | 32% | 100% | Reels, Stories, TikTok, Shorts, WhatsApp Status |
| 16:9 | 1920×1080 | 100% | 32% | YouTube, presentations, TVs |
Fill percentages are computed from the fit-inside rule the tool uses. If you would rather fill the frame and lose a little of the edges instead of having bars, use the video cropper.
For a portrait feed post, 4:5 1080×1350 takes up the most room on screen. For a square post use 1:1, and for Reels and Stories use 9:16 1080×1920.
Choose 9:16 1080×1920. A vertical phone video fills it completely. A landscape clip sits in the middle with bars above and below; to fill the screen instead, crop it to 9:16 with the video cropper.
YouTube Help says Shorts need a square or vertical aspect ratio, so a landscape clip does not meet that rule as it is. Choose 9:16 1080×1920 (or 1:1) to put it in a vertical or square frame.
Many people search for a video resizer in MB or KB when they really want a smaller file. Resizing changes the number of pixels. A lower resolution usually means a smaller file, but the exact MB size depends on the video, and this tool cannot aim for a size. The video compressor lets you pick a target size in MB, for example for WhatsApp, email or Discord. A good order is: resize to 720p here, then compress if it is still too big.
Every option on this page keeps the whole picture. The keep-shape options do not change the shape at all, and the frame options add black bars rather than cut. Nothing is ever trimmed from the edges. If you want the opposite, a full frame with the edges cut, that is cropping, and the video cropper does it.
On iPhone, open this page in Safari or Chrome, tap the file box and pick the video from your photo library or the Files app. The result goes to Downloads in Files. On Android, open it in Chrome and pick the video from your gallery; the result goes to your Downloads folder. On Windows or Mac, use any current browser and drag the file in. Use a computer for long or 4K videos; it is much faster than a phone, and files over about 1.5 GB may be slow or fail on phones.
The output size is exact: the 9:16 option gave 1080×1920 in our test, and the keep-shape options follow the formula, with the long side rounded to an even number. Honest limits:
Most online video resizers upload your file to their server, resize it there and send it back, often with a size limit, a sign-up or a watermark on the free plan. VidHaul uses the WebCodecs API, the video engine built into modern browsers, to decode, scale and encode the video on your own device. Nothing is uploaded, and once you have pressed Start the work keeps going even without an internet connection.
The sizes are not guesses. The keep-shape options always use your video’s own shape and even pixel sizes, and the frame options always fit the whole picture, so you can work out the result in advance from the tables on this page. The tool does only this job: it does not crop, change the speed or alter the colours.
We test with real files in a real browser. For resize video we check that the output has exactly the size the option promises: the 9:16 story option gave 1080×1920. The resolution table, the fill table and the pixel chart are not measurements; they are computed from the settings the code uses.
What we do not measure: we do not score visual quality and we do not predict the output file size, because it depends on the content of your video. The result card shows the size before and after, and Copy summary copies it for your notes.
| VidHaul resize video | Typical upload-based online video resizers | |
|---|---|---|
| Upload needed | No, the video stays on your device | Yes, the video is uploaded first |
| File size limit | No fixed limit (phones may struggle above about 1.5 GB) | Often a cap on free plans |
| Watermark | None | Sometimes, unless you pay |
| Sign-up | Not needed | Often needed for larger files |
| Works offline after loading | Yes, once the tool has started, the work needs no connection | No, the server does the work |
| Privacy | Video never leaves your device | Video is stored on a server for a while |
Only edit videos you own or have the right to use.
Choose your video on this page, pick a size such as 720p or 9:16, and press Start. When it finishes, click Download to save the resized video.
Pick 4:5 1080×1350 for portrait feed posts, 1:1 1080×1080 for square posts, or 9:16 1080×1920 for Reels and Stories. The video is fitted inside that frame with black bars where needed.
Choose 9:16 1080×1920. A vertical phone video fills the frame; a landscape video is placed in the middle with black bars above and below.
Use one of the frame sizes. They always fit the whole picture inside and add black bars instead of cutting anything off. For a filled frame with the edges cut, use the video cropper.
Lowering the resolution, for example from 1080p to 480p, usually makes the file smaller, but the exact MB size depends on the video. For a target size in MB, use the video compressor.
Making a video smaller (1080p to 720p) keeps it looking sharp on phones. Making a small video bigger cannot add detail, so it may look soft. Any resize re-encodes, so it is never a perfect copy.
The video keeps its own width-to-height ratio. A 16:9 video set to 720p becomes 1280×720, and a vertical 9:16 video becomes 720×1280.
Yes. It is free with no sign-up and no watermark, and your video is never uploaded.