Free

Free Image Resizer Online

A free image resizer: set exact width and height — with aspect-ratio lock — and download your resized image instantly.

Free tool · No sign-up · Private

Drop an image here

or click to browse your device — everything stays in your browser, nothing is uploaded.

Private by design. Everything runs 100% in your browser — your images are never uploaded, stored, or sent anywhere.

About this tool

About the Image Resizer

An image resizer changes a photo's dimensions to exactly what you need. Type the target width and height into this free online tool — or scale by percentage — and download the resized image in seconds. Bloggers fit images to their theme's content width, sellers meet marketplace dimension requirements, developers generate correctly sized assets, and anyone preparing a profile picture gets the exact pixels the platform asks for.

The aspect-ratio lock keeps your photo from stretching: change the width and the height follows proportionally. The live preview shows the original next to the resized result as you type, so you can judge sharpness before downloading. One honest note: shrinking a large photo down always looks great, but enlarging a small one cannot invent detail — upscaling past the original size softens the image, and no resizer can fix that. All resizing happens in your browser, so your photos stay private.

How it works

Three steps to the perfect size

Upload your image

Drop any image onto the page. The tool shows its original dimensions so you know what you're starting from.

Set new dimensions

Type exact width and height, or hit a preset — Full HD, 4K, Instagram post and story, link previews, avatars. The resized preview updates live next to the original with an exact file-size estimate.

Download

Pick PNG, JPG, or WebP output (with a quality slider for JPG/WebP) and grab the resized file. If you're upscaling past the original, the tool says so honestly before you commit.

Good to know

Sizes that just work

Common dimensions people actually need — all available as presets.

1920 × 1080 — Full HD

The classic 16:9 size for YouTube thumbnails, slides, and desktop wallpapers. Sharp enough for most screens without bloating the file.

1080 × 1080 — Instagram square

The standard square post size for Instagram and Facebook. With the lock on, a square crop of any photo resizes cleanly to this.

1200 × 630 — link previews

The Open Graph size used by Facebook, X, and LinkedIn link cards. Set this as your og:image for crisp social shares.

800 × 600 — web-friendly

A sensible size for in-article images and thumbnails — big enough to look good, small enough to load fast on mobile data.

Examples

Typical use cases

og-image.txt
Phone photo is 4032 × 3024 —
far too big for a blog hero.
Lock ON, set width to 1200 →
height follows at 900. Download
as JPG at 85% → loads in a flash.
marketplace.txt
Selling a phone case: marketplace
wants square photos. Keep the lock ON,
set width to 1080 → height follows at
1080. Batch done in seconds.

FAQ

Image resizer questions

What does the aspect-ratio lock do?
When the lock is on, changing the width automatically adjusts the height (and vice versa) to keep the original proportions — so your image never gets stretched or squashed. Turn it off to set any width and height freely.
Is there a maximum size?
Each side is capped at 8,000 pixels. Beyond that, browser canvas rendering gets slow and memory-hungry, so the tool politely asks you to pick a smaller size. 4K (3840 × 2160) presets are fully supported.
Does resizing reduce file size?
Usually, yes — fewer pixels generally means a smaller file, especially with JPG or WebP output. The tool shows a live output-size estimate under the resized preview before you download, so there are no surprises. Pair it with the Image Compressor if you need the smallest possible file.
Will upscaling make my image look better?
No. Enlarging an image beyond its original dimensions just stretches existing pixels — it adds no new detail, so it can look softer. The tool shows an honest note whenever you upscale. Resizing down is always safe; resizing up works best for small increases and clean graphics.
How accurate is the live preview?
Pixel-accurate. The preview is the actual resized image rendered in your browser — the same render the download uses — so what you see side-by-side with the original is exactly what you get, including the file-size estimate.
Are my photos uploaded anywhere?
Never. The whole resize happens in your browser with the canvas API — your images are never sent to a server, stored, or tracked.
How do I resize an image to exact dimensions?
Enter the target width and height, keep the aspect-ratio lock on to avoid stretching, and download — the output matches your numbers precisely.

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For developers

Need this programmatically?

YATools also exposes simple REST APIs for screenshots, audio, documents, and more — free tier included.

Explore the API →