How to resize an image for free

Need an image at an exact size for a profile, upload limit, or post? Here's how to resize any image for free in your browser — privately, with no signup.

1. Open the Image Resizer. Open the free Image Resizer — it runs in your browser.
2. Add your image. Drop in the image you want to resize. It stays on your device.
3. Set the dimensions. Enter the width and height in pixels. The tool stretches the image to exactly those numbers, so work out the second number to keep the proportions.
4. Download. Save the resized image locally.

Resize, crop or compress? Pick the right tool

These three get mixed up, and the wrong one produces a blurry or oddly shaped image. Resizing changes the pixel dimensions of the whole picture. Cropping cuts away part of the picture to change its shape without scaling what remains; use the Social Media Cropper for that. Compressing keeps the dimensions and reduces the file size; that is the Image Compressor. A common sequence for a listing photo is crop to the right shape, resize to the required dimensions, then compress for the web.

Common sizes you will be asked for

Use	Size (pixels)	Notes
Profile picture (most platforms)	400 × 400 or larger, square	Upload square; platforms crop to a circle.
Instagram post	1080 × 1080 (square) or 1080 × 1350 (portrait)	Stories and Reels: 1080 × 1920.
YouTube thumbnail	1280 × 720	16:9; keep text large.
Link preview (Open Graph)	1200 × 630	Used by LinkedIn, Facebook, WhatsApp previews.
LinkedIn banner	1584 × 396	Keep important content away from the left edge where the photo overlaps.
Shopify product image	2048 × 2048 recommended, square	Shopify's recommended size for product photos; smaller works, larger is scaled down.
Amazon main product image	At least 1000 px on the longest side; 1600 px or more is better	Needed for the zoom feature; main image on a pure white background.

Keeping the image sharp

• Always resize down from the largest original you have. Enlarging invents pixels and softens edges; shrinking keeps detail.
• Keep the same proportions unless you need an exact shape. This tool has no aspect-ratio lock, so typing a width and height in a different ratio from the original stretches faces and logos. Work out the second number yourself (new height = original height x new width / original width). If the target ratio differs from the original, crop first, then resize.
• Know the output format. This tool always saves a PNG, which is lossless and suits graphics and screenshots. For a photograph that PNG can be larger than the original JPG, so run it through the compressor afterwards.
• Check the file size after resizing. Downscaling usually shrinks the file too; if it is still heavy, run it through the compressor.

Doing this for hundreds of product photos?

One image is a thirty-second job. A catalogue of 800 SKUs, each needing a square main image, a resized gallery set and a compressed web version, is a week of repetitive work. That is the kind of task an ecommerce virtual assistant takes off your plate, together with the listing uploads that follow.

FAQ

Will resizing blur my image?

Shrinking keeps things crisp. Enlarging beyond the original size can soften it — start from the highest-resolution version you have.

Is the image uploaded anywhere?

No — resizing happens in your browser, so nothing is sent to a server.

What is the difference between resizing and compressing?

Resizing changes the pixel dimensions. Compressing keeps the dimensions and reduces the file size. Do both when preparing images for a website: resize to the display size, then compress.

Which format should I download?

This tool always saves a PNG. That suits graphics, screenshots and text; for a photo the PNG can be bigger than the original, so compress it afterwards if size matters.

Can I use it for Shopify or Amazon product images?

Yes. Shopify recommends 2048 × 2048 pixel squares; Amazon needs at least 1000 pixels on the longest side for zoom, with the main image on a white background.

Does resizing reduce the file size?

Usually, when you scale down, because there are fewer pixels to store. Scaling up increases it.

⚡ Preparing images and listings for a whole catalogue? An ecommerce virtual assistant handles image prep, uploads and catalogue updates for Shopify and Amazon stores →