Resize Image Online

How to Resize an Image

Resizing an image changes its pixel dimensions — making it larger or smaller — while optionally preserving the original aspect ratio to prevent distortion.

Image resizing is one of the most common tasks in digital image editing. Whether you need to prepare product photos for an online store, fit images into social media dimensions, reduce file size for faster web loading, or meet specific print requirements, resizing is the fundamental operation that makes it all possible. Modern browsers can perform high-quality image resizing entirely client-side using the Canvas API, meaning your images never need to leave your device.

There are two primary approaches to resizing: absolute (pixel-based) and relative (percentage-based). Absolute resizing lets you specify exact width and height in pixels — for example, 1000x1000 for Amazon product listings. Relative resizing scales the image by a percentage of its original dimensions — for example, 50% to halve the size. Both approaches can preserve the aspect ratio (the proportional relationship between width and height) to prevent the image from appearing stretched or squished.

Aspect Ratio

The aspect ratio is the proportional relationship between an image's width and height. A 1920x1080 image has a 16:9 aspect ratio. When resizing with the aspect ratio locked, changing the width automatically adjusts the height proportionally (and vice versa), ensuring the image doesn't appear distorted. Unlocking the aspect ratio allows you to stretch or compress the image to any arbitrary dimensions — useful when you need to fit a specific frame like Facebook's 1200x630 cover photo format.

Downscaling vs. Upscaling

Downscaling (making an image smaller) is straightforward and generally produces good results because you're discarding pixels. The browser's resampling algorithm blends adjacent pixels together smoothly. Upscaling (making an image larger) is more challenging because the algorithm must invent new pixel data that doesn't exist in the original. Small upscales (up to 150-200%) usually look acceptable, but extreme upscaling will introduce blur or artifacts. For high-quality upscaling beyond 200%, consider AI-powered upscaling tools that use neural networks to intelligently reconstruct detail.

Ecommerce Image Requirements

Major ecommerce platforms have specific image dimension requirements for optimal display. Amazon recommends at least 1000x1000 pixels for zoom functionality. Shopify supports images up to 4472x4472 but recommends 2048x2048 for sharp display on retina screens. eBay recommends at least 1600 pixels on the longest side. Meeting these requirements ensures your product images look professional and support all platform features like zoom and gallery views.

Image Resize Use Cases

Image Resize Tool Features

Frequently Asked Questions

Image Sizes for Every E-Commerce Platform

Each marketplace and e-commerce platform has specific image size requirements. Using the correct dimensions ensures your product photos look sharp and professional.

Amazon Product Image Requirements

Amazon requires a minimum of 1000 pixels on the longest side for the zoom feature to work (which significantly increases sales). The recommended size is 2000x2000 pixels for square product images. Main images must have a pure white background (#FFFFFF) with the product filling at least 85% of the frame. Additional images can show lifestyle scenes, infographics, and detail shots. All images must be JPG, PNG, TIFF, or GIF format. Use this tool's Amazon preset (1000x1000) as a minimum, or manually set 2000x2000 for optimal quality.

Shopify Product Images

Shopify supports images up to 4472x4472 pixels and recommends 2048x2048 for sharp display on retina screens. All product images within your store should use the same dimensions for a consistent catalog appearance — Shopify's grid layout looks best when all product images have identical aspect ratios. Square (1:1) is the most popular format. Shopify automatically generates multiple sizes from your upload for thumbnails, product pages, and zoom views.

eBay, Etsy, and Faire

eBay requires minimum 500x500 pixels and recommends 1600x1600 for the best buyer experience. Etsy requires 2000px minimum on the shortest side with 4:3 landscape recommended for the first image. Faire requires 1000x1000 minimum and recommends 2000x2000 square images. All three platforms benefit from high-resolution images because they enable zoom functionality that helps buyers inspect product details — directly correlated with higher conversion rates.

WooCommerce and Custom Stores

WooCommerce defaults to 600x600 for product thumbnails and allows full-size images for single product pages. For retina support, upload at 2x your display size (1200x1200 for a 600px display). Most WooCommerce themes auto-crop to square, so start with square images to avoid unexpected cropping. If your theme uses a different aspect ratio, check your theme settings and resize accordingly.

Image Resizing for Social Media in 2026

Social media platforms constantly update their image specifications. Here are the current recommended sizes for maximum visual impact.

Instagram Image Sizes

Feed posts: 1080x1080 (square), 1080x1350 (portrait 4:5, recommended for maximum feed presence), or 1080x566 (landscape 1.91:1). Stories and Reels: 1080x1920 (9:16 full screen). Profile picture: 320x320 minimum. Instagram compresses all uploads, so starting with sharp, high-resolution images and slight pre-sharpening produces the best results after platform compression.

YouTube, TikTok, and Pinterest

YouTube thumbnails: 1280x720 (16:9) — the most important image for click-through rate. Channel art: 2560x1440 with a 1546x423 safe area. TikTok: 1080x1920 for video thumbnails, 200x200 for profile. Pinterest: 1000x1500 (2:3 ratio) for standard pins — tall images perform best in Pinterest's vertical feed. Long pins up to 1000x2100 are also effective for infographics and step-by-step content.

Facebook and LinkedIn

Facebook feed: 1200x630 for link previews with maximum engagement, 1080x1080 for photo posts. Cover photo: 820x312 desktop, 640x360 mobile. LinkedIn: feed images 1200x627, article cover images 1200x644, company page banner 1128x191. LinkedIn's algorithm favors native image posts over link posts, so uploading properly sized images directly to the platform increases reach.

X/Twitter and Threads

X/Twitter: in-stream images 1600x900 (16:9) for maximum display area, profile photo 400x400, header 1500x500. Threads: inherits Instagram's image standards, with 1080x1350 portrait performing best. For both platforms, images with faces and bright colors receive higher engagement. Always preview your image at the actual display size before posting — what looks good at full resolution may lose impact at the small sizes these platforms use in the timeline.

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