Resize: change the size of your images

Changes the actual pixel size of every image in your batch — smaller (most common) or scale by percentage. Sharp output via Lanczos resampling.

Resize changes the actual pixel dimensions of every image in your batch. Make a 5000-pixel image into a 2000-pixel image, or scale everything down to 50% — your choice.

Resize uses Lanczos resampling, which is a fancy way of saying "the image stays sharp when it gets smaller." You won't see the blocky, pixelated look you get from cheaper resize tools.

Why this step matters

A few reasons you'd add Resize to a pipeline:

Source images are too big. If your AI generator, scanner, or download produces 8000-pixel files but your end use only needs 3000, resizing first makes the rest of your pipeline run much faster.
You need exact dimensions for an upload spec (less common — usually Reposition is better for hitting an exact spec because it sets the canvas size around your subject).
You want to scale a whole batch by the same percentage — like making everything 75% of its original size.

How to use it

Add Resize to your pipeline.
Choose how to specify the new size:

Width and Height in pixels — type the exact numbers
Scale percentage — type a number like 50 (for 50% of original)

Pick a Lock mode to control what happens to the aspect ratio (see below).

The settings

Setting	What it does
Width (pixels)	Target width for the resized image.
Height (pixels)	Target height for the resized image.
Scale (%)	Alternative to Width/Height — sets the new size as a percentage of the original. 50 = half size, 200 = double size.
Lock mode	How to handle aspect ratio. None = use width and height exactly (may stretch). Width = keep the width you set, calculate height from the original aspect ratio. Height = keep the height you set, calculate width. Both = scale the whole image proportionally.
Skip if already larger than (1000–10000 px)	Safety setting — skips this step on any image already bigger than this on its longest side. Default: 4000.
Skip if result would be larger than (5000–20000 px)	Safety setting — skips this step if the resize would produce an image bigger than this. Prevents accidentally crashing your browser by upscaling huge images. Default: 20000.

How Lock mode actually works

This is the setting people get wrong most often:

None — your width and height are used exactly. If your original image is square but you set 1000 × 500, the image gets squished to half-height. Use this only when you specifically want to stretch.
Width — your width number is used. The height is calculated automatically so the image keeps its original shape. Most common pick.
Height — same as Width but the height is the fixed value.
Both — keeps the original aspect ratio, fits the image into the width × height box you specified.

The safe default for most jobs: Lock = Both, then enter the largest dimension you want. ReadyPixl figures out the other one and keeps the image from squishing.

Common sizes people use

Use case	Size
Etsy listing image	2000 × 2000 px
Web hero image	2400 × 1200 px
Social media square	2048 × 2048 px
Email-friendly thumbnail	600 × 600 px
Web product image	1200 × 1200 px

For print-on-demand specs (Amazon Merch, Printful, Redbubble), use Reposition instead of Resize — Reposition sets the canvas size around your subject, which is what these sites actually want.

Tips

Resize early in your pipeline if you're making images smaller. The slower tools (Color Removal, Filters) will then run on the smaller images, which is much faster.
Resize late in your pipeline if you're making images bigger. Most tools work better at higher resolution.
Use the Skip settings to your advantage. If your batch has a mix of small and huge images, Skip-if-larger means the huge ones get downsized but small ones are left alone.
For making images bigger, the AI Upscale tool (10 credits per image — about 1¢ each, sign-in required) handles this much better than regular Resize. Resize will just stretch the existing pixels — fine for small upscaling, blurry for big jumps.

Things Resize doesn't do

It doesn't add a canvas around your subject. It just changes the image size. For "put my image on a 4500×5400 canvas," use Reposition.
It doesn't crop. If you want to cut your image down to a specific shape, that's a different tool. Resize keeps everything in the image.
It doesn't make small images look like high-resolution images. Stretching a 500-pixel image to 5000 pixels gives you a blurry 5000-pixel image. Use AI Upscale for that.