Resize Image

Resize any image by pixels or percentage in your browser. Lock the aspect ratio,...

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Quick answer

An image resizer changes a photo's width and height to an exact pixel size or a percentage scale. YaliKit's version runs entirely in your browser using the HTML canvas, so nothing is uploaded and there is no file size limit. Lock the aspect ratio to stay proportional, then export as PNG, JPEG, or WebP.

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What You Can Do

Pixels or Percent - Exact size or scale
Aspect Lock - Never squished
Social Presets - One-click sizes
Format + Quality - PNG, JPEG, WebP
Live Preview - Size before download
Nothing Uploaded - 100% in-browser

Why Use Resize Image?

Nothing Uploaded, 100% in Your Browser

Your image is decoded and resized locally with the HTML canvas, so it is never sent to a server. That means it is private, there is no file-size limit imposed by an upload, and the result is ready the instant you stop typing.

Resize by Pixels or Percent

Type an exact width and height, or scale by a percentage. An aspect-ratio lock keeps the other dimension in step so your photo never looks squished, and you can unlock it for an exact non-proportional size.

Any Format In, Any Format Out

Open PNG, JPG, WebP, GIF or BMP and export as PNG, JPEG or WebP, or just keep the original format. For JPEG and WebP a quality slider lets you trade a little sharpness for a much smaller file.

Live Preview With the Exact Output Size

You see the resized image, its new dimensions, and an estimated file size before you download. Change the width, format or quality and everything updates live, no re-uploading and no page reload.

Popular Uses

Social Media

Hit an exact preset for Instagram, Facebook, X or a YouTube thumbnail in one click.

Web and Email

Shrink oversized photos so pages load faster and attachments send without bouncing.

Listings and Uploads

Match the exact dimensions a marketplace, form or CMS requires before you upload.

Print and Wallpaper

Set a precise pixel size for a print layout, avatar, banner or device wallpaper.

How It Works

1

Drop or Choose an Image

Drag a file onto the box or click to browse. It loads straight into the page and stays on your device.

2

Set the Size

Enter a width or height in pixels, drag the percent slider, or tap a social preset. Keep the aspect lock on to stay proportional.

3

Pick a Format and Download

Choose PNG, JPEG or WebP (with a quality slider for the lossy ones), then download the resized image with its dimensions in the filename.

Quick Tips

Downscale Keeps Quality

Reducing size preserves sharpness, so resize down freely. Avoid enlarging much past the original, since browsers cannot invent detail that was never there.

WebP for the Smallest Web Files

Switch the output to WebP at 80 to 90% quality for photos headed to a website. You usually get a noticeably smaller file than JPEG at the same visual quality.

Unlock Only When You Must

Turning off the aspect lock lets you set any width and height, but a mismatched ratio will stretch the image. Match the ratio, or crop first, to keep it looking right.

Frequently Asked Questions

No. The whole thing runs in your browser using the HTML canvas. Your image is never transmitted to a server, so it stays private and there is no upload size limit to work around.
Type the width or height you want into the pixel inputs. With the aspect-ratio lock on, the other dimension updates automatically to keep the image proportional. Turn the lock off to set width and height independently.
Use the Scale control. Drag the slider or type a percent, and both dimensions scale together. 50% makes the image half size, 200% doubles it. It is the quickest way to shrink a photo by a set amount.
When it is locked, changing the width recomputes the height (and vice versa) from the original ratio, so the image is never stretched. Unlock it when you need an exact size that does not match the original shape.
Making an image smaller keeps it looking crisp. Enlarging beyond the original adds no real detail and can look soft or blurry, so the tool warns you when you upscale. For photos, WebP or JPEG at 80 to 90% quality is a good balance of size and sharpness.
PNG is lossless and best for logos, screenshots and transparency. JPEG is smallest for photographs. WebP usually gives the smallest file at the same quality and is supported by every modern browser. Keep original if you just want the same format back.
You can open PNG, JPG, WebP, GIF and BMP files. The canvas can export to PNG, JPEG and WebP, so GIF and BMP inputs are saved as PNG by default. Animated GIFs are resized as a single still frame.

Related Tools

Compress Image

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Crop Image

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Convert Image

Change between image formats

JPG to PNG

Turn JPGs into lossless PNGs