Free online image resizer sets a JPG, PNG, WebP or AVIF to an exact width and height in pixels, with the aspect ratio kept when one value stays on Auto. Select a fit mode and an output format, then download the resized image.
Image sizing work by OnlinePCApps since 2013
A photo straight from a phone or camera is often 4000 pixels wide or more, far larger than the slot it has to fit. Free online image resizer sets the exact width and height a place asks for, with the proportions kept intact.
A profile photo wants 400 by 400, a banner wants a fixed width and a marketplace rejects anything off its dimensions. Typing the required pixels into the online image resizer produces a picture that fits the slot.
A 4000 pixel photo shown in an 800 pixel column forces the browser to download and shrink it on every visit. Resizing to the width the layout uses cuts wasted bandwidth and helps the page paint sooner.
A passport photo portal, a visa form or a job board lists exact pixels. Entering those dimensions in the image resizer produces a file that matches the specification the office checks.
Select the JPG, PNG, WebP or AVIF to resize, either by dragging it onto the online image resizer panel or through the Upload Image button. One image file per run.
Type a width or a height in pixels, up to 8000. Leave the other field on Auto and the image resizer keeps the aspect ratio. Select a fit mode, an output format and a quality from 10 to 100.
Click Download Resized Image. The source file is never overwritten, which leaves it ready for another pass through the online image resizer at a different width.
To resize an image is to set its width and height in pixels. Online image resizer does that and outputs the resized image in PNG, JPEG, WebP or AVIF.
Type a width and a height in pixels, up to 8000 on either side. Leave one field on Auto and the image resizer fills it from the original proportions, so a 4000 by 3000 photo becomes 800 by 600 with no guesswork and no stretching.
Online image resizer outputs PNG, JPEG, WebP or AVIF, so a resize and a format conversion run in one pass. A quality value from 10 to 100 sets the compression level of a JPEG, WebP or AVIF result. How software knows an image file format explains what the extension is checked against.
Any platform size types straight in: 1080 by 1080 for a square post, 1080 by 1920 for a story, 1280 by 720 for a thumbnail or 1920 wide for a full HD screen. The exact pixels typed are applied, with Cover fit trimming any overflow.
When the new shape differs from the old, the fit mode decides the look. Cover fills the box and trims the overflow, Contain keeps everything visible, Inside and Outside keep the ratio within or beyond the box and Fill forces the exact dimensions.
Resize an image, resize a photo and set image dimensions all name one action here. A search for resize JPG, resize PNG or photo resizer lands on this online image resizer, and every source file stays exactly as it arrived.
Image resizing sets the pixel count of a picture. Direction, fit mode and output format decide how sharp the resized image looks, and what an image file remembers about its history explains the metadata riding along.
| The case | Result | What happens and why |
|---|---|---|
| Downscaling | stays sharp | Removing pixels the display no longer needs keeps the picture clean. |
| Upscaling | prevented | Upscaling is prevented by default, so a target larger than the source keeps the original pixel size. |
| Width or height only | ratio kept | The other field stays on Auto and fills in from the original proportions, so the picture never stretches. |
| Cover fit | fills and trims | Picture fills the exact box and the overflow is trimmed, the default in the online image resizer. |
| Contain fit | fits with bars | Entire picture stays visible inside the box and the leftover space is padded. |
| Inside, Outside, Fill | ratio or box | Inside and Outside keep the ratio within or beyond the box, Fill forces both dimensions. |
| Output format | PNG, JPEG, WebP, AVIF | Resized image is encoded in the selected format, so a resize and a conversion run in one pass. |
| Quality | 10 to 100 | Sets the compression level of a JPEG, WebP or AVIF output, with a default of 90. |
| Transparency | kept | Clear background survives when the output is PNG or WebP. |
| Where it runs | on the device | Every picture is processed in the browser, so nothing is uploaded. |
Online Image Resizer Draws the Same Picture at New Dimensions
Image resizing is a three-step bitmap operation: the source file is decoded to a bitmap, resampled to the target width and height, then encoded in the selected output format. The direction matters. Downscaling is the well-behaved case, because a properly band-limited filter drops the detail that cannot survive at the lower pixel count, so the resized image stays clean and free of moire and aliasing. Upscaling is the harder case, since enlarging cannot invent detail that was never captured, which is why the online image resizer prevents it by default and keeps the original pixel size instead. Two honest points guide the work. Leaving one field on Auto keeps a picture from distorting, because that value is filled from the original proportions. And when both values are typed, the fit mode decides the shape: Cover fills the box and trims the overflow, Contain keeps the entire picture with padded space and Fill forces the exact dimensions. Resizing to display size is also the step to do before compressing, not after. The standards linked below cover every input format and every output format on this page.
Both set new pixel dimensions. An online image resizer and a hosted resizer differ on price, caps and batch size, while a photo is often a personal one.
| Point of comparison | This tool Resized in the browser On the device | Hosted resizer Uploaded and resized on a server |
|---|---|---|
| Where the photos go | Never leave the device | Uploaded to a server |
| Price and caps | Free with no file cap | A free plan is usually limited |
| Camera RAW files | Common web formats here | RAW opens on a server or desktop |
| Hundreds of images | A set at a time in the browser | A big batch runs on their machines |
| A saved dimension preset | Entered fresh in the tab every visit | A desktop app remembers it |
Those last three rows favour a desktop or hosted route, because camera RAW, a run into the many hundreds and a remembered preset all ask for more than a single tab can offer. For everyday photos the top two rows decide it: the pictures stay put and the work carries no charge or cap.
Every picture is repainted at its target dimensions on a canvas inside the tab itself. That keeps the work local to whichever machine opened the page, with no file handed to a server for processing.
Pictures are often private: a screenshot, an ID card, a family shot none of which belong on someone else's server. Plenty of hosted resizers take a copy and pledge to erase it later. Doing the work on the device skips that transfer altogether.
Four other routes set a picture's dimensions without the online image resizer on this page, at different costs in effort, money and where the file goes. Online file tools and which ones upload sorts the upload question out.
Preview, Paint and ImageMagick keep the file local, yet one is Mac only, one is Windows only and one lives at a terminal. Online image resizer here needs no install and adds five fit modes and AVIF output.
A moment of background decides how to approach image resizing, whichever photo is on the way in and wherever the resized image is headed.
A downscaled file has thrown away pixels, and enlarging it back does not restore them. Work on a copy and keep the full-resolution master, so a clean source is always there to export at any size.
Shrinking a large photo is clean, because the filter drops only the detail the smaller size cannot hold. Enlarging a small one invents no detail, which is why the online image resizer declines to enlarge past the source size.
Order matters when a file needs both. Set the dimensions first, then run the result through the online image compressor to reduce file size, since compressing first and resizing later carries the artifacts through.
Point the desktop image resizer at a folder of hundreds and it drives the entire set to one width or preset in one run.
Aim it at a folder and every picture lands at the target width in one sweep, saved beside the source.
A stored preset carries width, height, ratio and format, so a repeat job takes one click and no retyping.
Camera RAW straight off a DSLR and multi-page TIFF are opened and resized, file types a browser tab cannot decode by itself.
Free to use, with nothing to install and no watermark. Set a picture to any width and height in the browser with the online image resizer.