Resizing is one of the most common image tasks — whether you are preparing a profile picture, optimizing for a website, or hitting an upload size limit. This guide explains every option in the Wizard Image resize tool so you always get the exact result you are after.

Step-by-step: resize an image

  1. Go to the tool — Open Wizard Image — Resize Image.
  2. Upload your image — Drag-and-drop or click to select any JPG, PNG, WebP, AVIF or GIF.
  3. Enter your dimensions — Type the target Width and/or Height in pixels. You do not need to fill in both — see below for details.
  4. Choose a fit mode — This is the most important setting. Each mode handles the aspect-ratio calculation differently.
  5. Click "Resize Image" — Done. Download your resized file.

Understanding fit modes

Fit modes control what happens when the target dimensions have a different aspect ratio from the original image.

Inside (default)

Scales the image down so it fits inside your specified box, preserving the aspect ratio. The image will never exceed your target width or height, but it may be smaller. Best for: resizing photos to a maximum dimension without stretching or cropping.

Cover

Scales and crops the image so it fully fills the target box. Some of the original content may be clipped. Best for: social media banners, cards, thumbnails that require an exact size.

Contain

Fits the entire image inside the target box and pads the empty space with a background color. Best for: product images on white backgrounds, email templates.

Fill

Stretches the image to exactly match the target dimensions, ignoring aspect ratio. Watch out: this will distort the image if the aspect ratio differs.

Tip: If you only care about limiting one dimension, enter only the width (or height) and leave the other blank. The tool will scale proportionally.

Common resize use cases

Profile pictures

Most platforms expect a square crop. Set Width = Height (for example 400 × 400) and choose Cover. The tool will crop from the center to give a square result.

Website hero images

Target around 1920 × 1080 pixels. Use Inside so you do not distort the image, then follow with compression to keep the file under 300 KB.

Email newsletters

Keep images under 600 px wide. Narrow email clients will distort wider images. Use Inside with Width = 600.

Reducing file size

Halving the pixel dimensions quarters the file size. If you have a 4K photo (3840 px wide) and need it for web, resize to 1920 px and you will roughly halve the storage requirement before even compressing.

Note: Resizing an image to larger dimensions than its original (upscaling) will make it blurry. Wizard Image uses the Lanczos3 algorithm which is one of the best available for upscaling, but there is a physical limit to how much detail can be recovered.

What formats are supported?

Input: JPG, PNG, WebP, AVIF, TIFF, GIF
Output: same format, or choose to convert at the same time.

Resize vs. crop — what is the difference?

Resize changes the total number of pixels in the image. Crop cuts out a rectangular region without scaling. If you want to keep a specific region of your photo, use the Crop tool instead — it lets you drag to select any area.

Frequently asked questions

Does resizing reduce quality?

Downscaling a high-resolution image will look sharp. Upscaling beyond the original resolution will cause visible softness. Always keep your highest-resolution original.

Can I resize a GIF and keep the animation?

Not currently. The standard Resize Image tool is best for static images. For animated GIF workflows, resize your source images before using GIF Maker, or set the target width directly in Video to GIF when starting from video.