Generating a social-media-ready image (Twitter header 1500×500, OG card 1200×630, Instagram square 1080×1080). Trimming a huge phone photo to a more web-appropriate width before uploading to a blog or CMS. Producing thumbnails — half-size or quarter-size presets give you a quick downscale without typing numbers. Squeezing an image under an upload-size cap by dropping a few hundred px in each dimension.

Lock aspect ratio defaults to ON. If you need to crop to an arbitrary aspect (e.g. a strict 1200×630 OG card from a portrait phone photo), uncheck the lock — the image will stretch to fit. For real cropping (without distortion), pre-crop in another tool first. Quality slider is JPG/WebP only. PNG re-encodes losslessly, so the slider has no effect on PNG output. Big canvases hit browser limits. Most browsers cap a single canvas at ~16384×16384 px (and far less on mobile). If your image is larger than that, the resize may silently fail. Upscaling won't add detail. Resizing from 500×500 to 2000×2000 stretches pixels — the result looks blurry. Always start from the highest-resolution source you have.

Image Resizer

Resize images to any width or height in your browser. Lock aspect ratio, scale down social-media-friendly sizes, download instantly. No upload.

Pick an image (PNG, JPG, WebP)

🔒 Files never leave your browser — no upload, no server, no tracking.

Target dimensions

Width (px)

Height (px)

Lock aspect ratio

Quality 0.90

Quality applies to JPG and WebP outputs only.

Presets

Preview

Pick an image to begin.

What is this for?

This tool resizes a PNG, JPG, or WebP image to whatever pixel dimensions you ask for. The image is decoded by the browser, drawn into a canvas at the target size with high-quality smoothing, and re-encoded in the same format. The output downloads as a blob. Nothing is uploaded — the resize happens entirely client-side.

When to use it

Generating a social-media-ready image (Twitter header 1500×500, OG card 1200×630, Instagram square 1080×1080).
Trimming a huge phone photo to a more web-appropriate width before uploading to a blog or CMS.
Producing thumbnails — half-size or quarter-size presets give you a quick downscale without typing numbers.
Squeezing an image under an upload-size cap by dropping a few hundred px in each dimension.

Common gotchas

Lock aspect ratio defaults to ON. If you need to crop to an arbitrary aspect (e.g. a strict 1200×630 OG card from a portrait phone photo), uncheck the lock — the image will stretch to fit. For real cropping (without distortion), pre-crop in another tool first.
Quality slider is JPG/WebP only. PNG re-encodes losslessly, so the slider has no effect on PNG output.
Big canvases hit browser limits. Most browsers cap a single canvas at ~16384×16384 px (and far less on mobile). If your image is larger than that, the resize may silently fail.
Upscaling won't add detail. Resizing from 500×500 to 2000×2000 stretches pixels — the result looks blurry. Always start from the highest-resolution source you have.