Resize & Compress Images Without Losing Quality

What Is an Online Image Resizer?

An online image resizer lets you change the dimensions of a photo or graphic without installing software. You can reduce an image from 4000px wide to 800px for a website, scale it to 50% of its original size for email, or set exact pixel dimensions required by a platform or client.

Most online resizers send your file to a server for processing. Our free image resizer is different — it runs entirely inside your browser using the HTML5 Canvas API. Your image never leaves your device, which means no privacy concerns, no waiting for uploads, and no file size limits imposed by server constraints.

You can resize JPG, PNG, and WebP images by exact pixel width and height, or by a percentage of the original dimensions. The aspect ratio lock feature prevents distortion when you only specify one dimension.

How to Resize an Image Online (Step-by-Step)

1. Click Click to select an image above and choose a JPG, PNG, or WebP file from your device.
2. Adjust the quality slider to control compression — higher quality means larger file size, lower quality means smaller file.
3. Enable Lock aspect ratio if you want to change one dimension without distorting the image.
4. Enter your target width and height in pixels, or use the percentage field to scale proportionally (e.g., 50 for half size).
5. Click Resize & Compress to process the image.
6. Click Download image to save the resized file.

The tool shows you the original and compressed file sizes so you can see exactly how much space you saved before downloading.

Common Image Dimensions by Use Case

Website & Blog Images

Full-width hero images typically work best at 1920×1080px or 1600×900px. Blog featured images are usually 1200×630px (matching Open Graph dimensions). Body content images should be 800px wide or narrower to avoid layout overflow.

Email Campaigns

Email images should be 600px wide maximum to display correctly in most email clients. Keep file size under 200KB for fast loading on mobile devices and to avoid spam filters triggered by large image payloads.

eCommerce Product Photos

Amazon requires minimum 1000×1000px for zoom functionality, with 2000×2000px recommended for best quality. Shopify recommends 2048×2048px. Resize down to 800×800px for faster page loads on secondary images.

Social Media

Instagram posts: 1080×1080px. Facebook posts: 1200×630px. Twitter/X posts: 1600×900px. Use our Social Media Image Resizer for one-click platform-specific resizing.

When to Use Pixel vs Percentage Resizing

Use pixel dimensions when a platform or template requires an exact size — for example, Amazon product images (1000×1000px), YouTube thumbnails (1280×720px), or email header images (600×200px). Pixel dimensions give you precise control.

Use percentage resizing when you want to scale down proportionally without knowing the final dimensions — for example, "reduce all images to 50% of their original size" for faster web loading, or "shrink to 75%" before sending via email. Percentage resizing always preserves the original aspect ratio automatically.

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Frequently Asked Questions