Is it safe to resize an image online?

Yes — and ours is safer than most. Many free online tools quietly upload your files to their servers to do the work. We don't. Everything happens inside your browser on your own device, so your files never reach the internet. There's no upload step, no server copy, and no way for us (or anyone else) to see what you're working on.

Are my files uploaded to a server?

No. There's no server-side processing here. The whole tool is a tiny app that runs in your browser — we don't even have a server that could receive your files. You can confirm this by opening your browser's network tab while you use the tool: nothing leaves your device.

Do I need to sign up or pay?

No. There's no account, no email collection, no credit card. The tool is free to use as much as you want, on as many files as you want. We're supported by a few unobtrusive ads on the page — not by your data.

Why Lanczos3 over the browser's built-in resize?

Canvas drawImage uses the browser's default scaler — usually bilinear, sometimes bicubic in Chrome with `imageSmoothingQuality:'high'`. Lanczos3 is sharper for downscales and matches what Photoshop / GIMP / ImageMagick produce.

iPhone Pro 'physical' vs 'logical' resolution?

Our presets are physical pixels (what the file should actually contain). iOS reports a 'logical' point grid that's 2× or 3× smaller. The file sizes here are what you upload to App Store Connect or use as wallpaper.

What's Cover vs Contain?

Cover scales + crops to fill the target exactly (no letterbox). Contain shrinks the longest side to fit and pads with the original aspect ratio. Cover for backgrounds, Contain for thumbnails.

Image Resizer

Resize any image to the exact size you need — wallpapers for iPhone or Android, perfect squares for Instagram, banners for Twitter and LinkedIn, OG images for your blog. Pick a device or platform and we handle the dimensions. The result stays sharp because we use a high-quality resampling method (the same kind Photoshop uses).

Features

30+ device + social presets: iPhone 15 series, Pixel, Galaxy, iPad, Instagram square/portrait/story, X/LinkedIn/FB, YouTube thumbs, OpenGraph
By-width, by-height, percent, or exact-pixel modes
Lanczos3 resampling — sharper than browser bilinear/bicubic
Cover (fill, crop) or Contain (fit) mode for non-matching aspect ratios
Output as JPEG / PNG / WebP / AVIF with quality control

How to image resizer

Drop an image — Source can be any size or format.
Pick a device or target size — iPhone 15 Pro, Instagram Story, OpenGraph, etc. — all popular sizes pre-listed.
Choose output format + quality — WebP at 85 is the universal default for web.
Download — Filename includes the new dimensions for traceability.

Frequently asked questions

Is it safe to resize an image online?: Yes — and ours is safer than most. Many free online tools quietly upload your files to their servers to do the work. We don't. Everything happens inside your browser on your own device, so your files never reach the internet. There's no upload step, no server copy, and no way for us (or anyone else) to see what you're working on.
Are my files uploaded to a server?: No. There's no server-side processing here. The whole tool is a tiny app that runs in your browser — we don't even have a server that could receive your files. You can confirm this by opening your browser's network tab while you use the tool: nothing leaves your device.
Do I need to sign up or pay?: No. There's no account, no email collection, no credit card. The tool is free to use as much as you want, on as many files as you want. We're supported by a few unobtrusive ads on the page — not by your data.
Why Lanczos3 over the browser's built-in resize?: Canvas drawImage uses the browser's default scaler — usually bilinear, sometimes bicubic in Chrome with `imageSmoothingQuality:'high'`. Lanczos3 is sharper for downscales and matches what Photoshop / GIMP / ImageMagick produce.
iPhone Pro 'physical' vs 'logical' resolution?: Our presets are physical pixels (what the file should actually contain). iOS reports a 'logical' point grid that's 2× or 3× smaller. The file sizes here are what you upload to App Store Connect or use as wallpaper.
What's Cover vs Contain?: Cover scales + crops to fill the target exactly (no letterbox). Contain shrinks the longest side to fit and pads with the original aspect ratio. Cover for backgrounds, Contain for thumbnails.