Image Resizer
Change the dimensions of your JPG, PNG, or WebP images by exact pixels or by percentage.
Drag and drop an image here, or
50 means half the original size, 200 means double.
PNG is lossless: quality is ignored.
Choose an image and press Resize to see your result.
Files never leave your browser.
Resize Image Dimensions, Free and Private
When you need to resize image files, you usually need exact dimensions: a 1080 by 1080 post, a 1600 pixel wide blog hero, or a tiny thumbnail. Pixel File lets you resize image files right in your browser by pixels or by percentage, with an aspect-ratio lock that keeps everything undistorted. There is no signup and nothing uploads anywhere – your photo never leaves your device.
Resizing is one of the most common photo chores on the internet. Oversized images slow down pages, get cropped badly by social networks, and bounce email attachments. Setting the dimensions yourself puts you in control, and pairing a resize with compression is the classic one-two punch for web-ready images.
How to Use the Image Resizer
- Drop your image into the tool above or click to browse your device. JPG, PNG, WebP and other common formats are supported.
- Type the width and height in pixels, or choose a percentage to scale the image down. Keep the aspect-ratio lock on to avoid stretching, and preview the new dimensions before you download.
- Click Resize and download the new file. If the file is still heavy, run it through the image compressor afterwards.
How It Works
Resizing uses canvas resampling: the image is drawn onto a new canvas at the target dimensions, and the browser computes each new pixel from the original ones. This is a genuine re-render, not a stretch, so downscaling actually produces a sharper-looking small image because multiple original pixels are blended into each new one. Upscaling works too, but it cannot create detail that was never there, so enlarging beyond the original size looks progressively softer.
The aspect-ratio lock keeps the width-to-height proportion constant, so changing the width automatically sets the correct height. The percentage mode applies the same resampling at a chosen fraction of the original size, which is handy for “make everything half the size” jobs. Everything happens locally in your browser, so no file is ever sent to a server.
A Worked Example
Say you have a 4032 by 3024 phone photo (about 4.2 MB) and need an Instagram post. Resizing to 1080 by 1080 with the aspect-ratio lock off (square crop handled by Instagram itself) or 1080 by 1350 for a portrait post drops the file to roughly 300 to 500 KB depending on detail, and the small image actually looks crisper on a phone screen than the original did at full size. For a blog thumbnail, resizing to 320 by 180 pixels at 50 percent quality compression afterwards yields a file under 30 KB that loads instantly.
Frequently Asked Questions
Does resizing reduce the file size?
Almost always. Fewer pixels means less data, so a downscaled image is much smaller on disk. For the smallest possible file, resize first and then compress with our image compressor.
Can I enlarge an image to bigger dimensions?
Yes, you can type larger dimensions, but the result will look softer because the browser has to invent new pixels. For big enlargements, dedicated upscaling software gives better results.
What is the aspect-ratio lock?
It keeps the width and height proportional, so your photo never looks stretched or squashed. Turn it off only when a platform demands exact dimensions like a square 1080 by 1080.
Which formats can I resize?
The resizer handles JPG, PNG, WebP and other browser-readable image formats. If your iPhone photo is in HEIC, convert it first with our HEIC to JPG tool.
Is my photo uploaded to a server?
No. The resizer runs 100% in your browser, so your files never leave your device. Nothing is uploaded, stored, or shared.
Does resizing lose quality?
Downscaling discards pixels permanently, so you cannot get the original resolution back from the resized copy. Keep a backup of the original if you might need the full size later.
More Free Tools
Once your dimensions are right, you may want to compress the image for a smaller file size, crop an image to focus on one part, convert the image format to JPG, PNG or WebP, or increase the DPI of a photo you plan to print. Every Pixel File tool is free and runs entirely on your device.