Free Online Image Resizer

Change width and height in pixels or percentage. Ready-made presets for Mercado Livre, Shopee, Amazon, Instagram, and more. Automatic aspect ratio, instant preview, no file uploads.

Drag an image here
or click to select — JPG, PNG, WebP, GIF
Original: —
Common sizes
— × —
Original width
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Original height
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New width
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New height
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Format:

Why use this resizer?

Automatic aspect ratio
The lock keeps the original aspect ratio when you change width or height, preventing distortion.
Ready-made presets
Predefined sizes for Full HD, Instagram, Facebook, Mercado Livre (1200×1200), Shopee (1024×1024), Amazon (2000×2000), and other common formats.
Pixels or percentage
Resize to exact pixel dimensions or shrink/enlarge by a percentage of the original image.
Choose the format
Download the result as JPEG, PNG, or WebP, regardless of the original file format.

When should you resize an image?

Resizing images is one of the most common everyday digital tasks, whether for personal or professional use. Whenever you need to email photos, post on social media, update a website, or prepare images for e-commerce, getting the dimensions right makes all the difference — both for visual quality and for your project's performance.

Resizing images for the web

For web use, content images rarely need to exceed 1200px in width. Most site layouts work with columns between 800px and 1200px, and images larger than that take up more disk space and increase page load time without offering any visual benefit to the visitor. Keeping proper dimensions is one of the simplest performance optimization practices and directly contributes to better search engine rankings.

Ideal dimensions for social media

Each platform has its own specifications. On Instagram, the standard square format uses 1080×1080px, while vertical stories and reels call for 1080×1920px. For Facebook, feed posts look best at 1200×630px. On Twitter/X, landscape images display at 1200×675px. YouTube thumbnails look best at 1280×720px — the minimum recommended resolution for good quality on any device.

Recommended sizes for e-commerce

On major online marketplaces, image dimensions directly impact conversion. Mercado Livre recommends images of at least 1200×1200px to ensure good visibility in search results. Shopee accepts images up to 1024×1024px in square format. Amazon requires at least 1000px on the longest side, but recommends 2000×2000px to enable the zoom feature, which improves the shopping experience and boosts conversion rates.

Why does the right size matter?

Using images with improper dimensions can hurt your product's appearance, increase bandwidth usage, and even get penalized by e-commerce platform algorithms. Resizing correctly before upload ensures your images load faster, look sharp on any screen, and meet the technical requirements of each publishing channel.

Frequently asked questions

What does keeping the aspect ratio mean?
Keeping the aspect ratio (lock enabled) means that when you change the width, the height is automatically adjusted to keep the same relationship between the original dimensions, preventing the image from looking stretched or squashed.
Can I enlarge a small image?
Yes, but enlarging beyond the original size causes pixelation — the image becomes blurry or blocky. The tool allows enlarging, but the result depends on the quality of the original image.
What's the difference between resizing and compressing?
Resizing changes the image's physical dimensions in pixels. Compressing keeps the dimensions but reduces quality to shrink the file size. For websites, it's best to do both: resize to the display size and compress to reduce file weight.
Is there a limit on image size?
The tool has no imposed limit. Very large images (above 20MP) may take a few seconds to process depending on your device.
What image size should I use to sell on Mercado Livre, Shopee, and Amazon?
Mercado Livre recommends at least 1200×1200px for good visibility in search results. Shopee accepts up to 1024×1024px in square format. Amazon requires at least 1000px on the longest side, but recommends 2000×2000px to enable zoom — a feature that boosts conversion rates. Use the tool's ready-made presets to apply each size with one click.
How do I resize an image for Instagram without losing quality?
For feed posts, use 1080×1080px (square) or 1080×1350px (portrait). For stories and reels, 1080×1920px is ideal. Export in high-quality JPEG or WebP for a smaller file with good sharpness. Avoid enlarging images smaller than the target size — this causes visible pixelation.
Does resizing images improve my site's Core Web Vitals?
Yes, directly. Images larger than necessary increase LCP (Largest Contentful Paint) and hurt your Google PageSpeed score. Resizing to the actual display size — usually between 800px and 1200px wide for web content — reduces file weight and speeds up page load with no visible loss for the visitor.
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