Image Resizer

How to resize an image to exact dimensions

Resizing an image means changing how many pixels it contains. Enter a width and height, drop your images, and the tool redraws each one at the new size in your browser, with nothing uploaded. Keep "maintain aspect ratio" on and the image scales to fit inside your width and height without stretching, so circles stay round and faces stay natural. Turn it off only when you deliberately need to force an exact width and height and do not mind some distortion.

Switch the units to suit the job. Pixels are what the web uses, so a 1200 by 800 blog image or a 1920 by 1080 hero is measured in pixels. Percent scales every image by the same factor, which is handy when a folder of photos just needs to be half the size. Inches and centimeters are converted at 96 pixels per inch, useful when someone hands you a physical dimension. Whatever you choose, the preview shows the real result for your first image so you can confirm before downloading.

Resize for Instagram, YouTube and social platforms

Every platform has its own ideal dimensions, and posting the wrong size means awkward cropping or soft, upscaled images. The presets cover the sizes people search for most: 1080 by 1080 for an Instagram post, 1080 by 1920 for a story, 1280 by 720 for a YouTube thumbnail, 1920 by 1080 for a hero image and 1200 by 800 for a blog image. Pick a preset, drop your images, and download the set. For a platform not listed, choose custom and type the exact width and height.

A few sizes come up again and again in searches, and each is a single click or a quick custom entry here:

• 1920 × 1080 — full-HD hero images, desktop backgrounds and 16:9 visuals. Resize an image to 1920x1080 for a standard widescreen banner.
• 1280 × 720 — a lighter 16:9 size and the standard YouTube thumbnail dimension.
• 1200 × 800 — a common 3:2 blog and article image.
• 1080 × 1080 — square Instagram posts and profile-style crops.
• 1080 × 1920 — vertical 9:16 for Instagram and Facebook stories and reels.
• 820 × 312 — the Facebook page cover size.
• 500 × 500 and 240 × 240 — small square avatars, icons and marketplace thumbnails.

Because you can drop a whole folder at once, preparing a batch of images at a consistent size, then downloading them as a ZIP that keeps your folder structure, takes seconds rather than opening each file in an editor.

Resize an image to 20KB, 100KB or a target file size

Reducing the dimensions is also the simplest way to bring a file's weight down, since fewer pixels means fewer bytes. If you need to resize an image to 100KB, or even resize an image to 20KB for a form with a strict limit, start by scaling it to the smallest dimensions that still look right, which often gets you most of the way there. When you need to hit an exact kilobyte ceiling rather than a pixel size, pair this with our image compressor, which searches for the highest quality that stays under a target like 20KB, 100KB or 1MB.

How to resize a JPEG or PNG without losing quality

To resize a JPEG, drop it in, set the width or height, and keep aspect ratio on so it scales cleanly; the same steps adjust a JPEG's size on any device without a desktop editor. Scaling down never invents pixels, so a resized JPEG or PNG stays sharp as long as you go smaller, not larger. PNG keeps its transparency through the resize, while a JPEG is flattened onto a white background since it has none.

Why resizing images matters for SEO and speed

The most common performance mistake on the web is serving an image far larger than it displays, then shrinking it with CSS. The browser still downloads every pixel of the original, so a 4000 pixel photo squeezed into a 600 pixel slot wastes most of its bytes. Resizing the file to the size it actually appears removes that waste and directly improves Largest Contentful Paint, one of the Core Web Vitals Google measures.

Right-sizing pairs well with compression and a modern format. Resize the image to its display dimensions first, then compress it and, where you can, serve WebP. Together these steps often cut an image's weight by an order of magnitude, which is usually the single biggest speed win available on an image-heavy page and a real contribution to better rankings.

Frequently asked questions

Will resizing reduce image quality?

Making an image smaller keeps it sharp, since you are discarding pixels the display does not need. Enlarging an image beyond its original size is where quality suffers, because the browser has to invent detail. For the best result, resize down to the dimensions you need rather than up.

What does "maintain aspect ratio" do?

It scales width and height together so the image is not stretched. With it on, your width and height act as a box the image fits inside. Turn it off to force an exact width and height, which can distort the image.

Are my images uploaded to a server?

No. Resizing runs entirely in your browser, so your files never leave your device.

Can I resize many images to the same size at once?

Yes. Drop up to 200 images or a folder, set one target size, and download them all as a ZIP with your folder structure preserved.