Image resizer

Resize images right in your browser

Sooner or later everyone hits the same wall: an online application that demands a photo “no larger than 800×600 pixels”, an Instagram post that gets cropped because the picture isn’t square, or an email that bounces because the attachments are too heavy. This tool fixes all of that in seconds: load one or several JPG, PNG or WebP images, type the width and height you need (or hit a preset), and download the result.

Everything happens inside your browser using the canvas API. Your images are never uploaded to any server — they don’t travel across the internet and nobody else ever sees them. That makes it safe for IDs, documents, medical forms or family photos, and it even keeps working offline once the page has loaded.

How to use it

1. Drag your images onto the drop zone or click “Choose images”. You’ll see each file’s name, size and original dimensions.
2. Type the width or height you want. With the lock enabled, the other value recalculates automatically so the photo keeps its shape; unlock it if you need exact, independent measurements.
3. In a hurry? Use the presets: 1920×1080, 1280×720, 800×600, Instagram 1080×1080, or scale everything down to 50% or 25%.
4. Click “Resize and download”. A single image downloads directly as “photo-800x600.jpg”; several images arrive together in a ZIP file.

The output keeps the original format — JPG stays JPG, PNG stays PNG, WebP stays WebP — with high quality settings for compressed formats.

Resizing is not the same as compressing

People mix these up all the time. Resizing changes the pixel dimensions: a 4032×3024 photo becomes 1280×960, and it also gets lighter simply because there are fewer pixels to store. Compressing keeps the dimensions and shrinks the file size by trading away some encoding quality. If your problem is that an image “doesn’t fit” a form or looks huge on screen, resize it; if the dimensions are fine but the file is too heavy, use our sister image compression tool. For email attachments, combining both usually works best.

A worked example

Maria has to upload a headshot to a job portal that requires “800×600 px maximum, under 1 MB”. Her phone shoots 4032×3024 photos weighing about 4.5 MB. She loads the photo, types 800 as the width, and because the lock is on and the original ratio is 4:3, the height snaps to 600 by itself. She downloads “headshot-800x600.jpg”, now around 120 KB — both requirements met without opening a single editor.

Enlarging an image costs sharpness

Shrinking a picture almost always looks fine. Enlarging it doesn’t: the extra pixels don’t exist in the original, so the browser has to invent them through interpolation, averaging neighboring pixels. The result is a bigger but blurrier, softer image. If you need a large version, always start from the highest-resolution original you have — never from an already-reduced copy.

Frequently asked questions

How do I keep the photo from getting distorted?

Leave the aspect-ratio lock on: change the width and the height recalculates automatically (and vice versa), so the image keeps its shape. If you unlock it and force dimensions with a different ratio, the picture will be stretched or squashed to fill that exact size. With several images loaded and the lock on, each one keeps its own proportions.

What sizes do social networks use?

The built-in presets cover the most common cases with one click.

Can I use pixels for printing in inches or cm?

Pixels map to physical print sizes through resolution (dpi, dots per inch). At 300 dpi — the photo-quality standard — a 4×6 inch print needs about 1200×1800 pixels. This tool works in pixels, so for printing, work out how many pixels your print size needs first, then resize to that number.

Are my photos uploaded anywhere?

No. The resizing runs in JavaScript with the canvas API inside your own browser: images never leave your device, are never stored anywhere, and are never seen by anyone. That’s the key difference from services that make you upload your files first.