Image Resizer Online — Resize Images Without Stretching

Whether you need thumbnails for a website, profile pictures for social media, or images scaled for a specific print size, the Image Resizer from ConvertFree.net handles it in seconds. Enter a maximum width, height or both — the tool scales each image to fit within your specified box while preserving the original aspect ratio, so images never look squashed or stretched.

Width Only, Height Only, or Both?

• Width only: The image is scaled so its width equals your maximum. Height is calculated automatically to maintain proportions.
• Height only: The image is scaled so its height equals your maximum. Width is calculated automatically.
• Both width and height: The image is scaled to fit inside the bounding box defined by both values. The constraining dimension is whichever would be exceeded first — nothing is cropped or stretched.

What Does "Do Not Enlarge Smaller Images" Mean?

When this checkbox is ticked, images that are already smaller than your target dimensions are left at their original size instead of being scaled up. Upscaling small images increases file size without adding detail — it just makes pixels larger and blurrier. Leave this checked for most use cases.

Common Image Resize Use Cases

• Website performance: Scale large product photos to a maximum of 1200px wide before uploading to your CMS — saves bandwidth and improves Core Web Vitals scores.
• Social media: Resize images to the exact dimensions for each platform to avoid automatic re-cropping or compression artefacts.
• Email campaigns: Resize images to 600px wide (standard email content width) to keep newsletters looking sharp across all email clients.
• Print preparation: Match specific print dimensions while keeping the image proportional — then send to a print service.

After Resizing

Resized images can be further optimised using the Image Compressor to reduce file size, or converted to modern WebP format using Image to WebP for web use. If you need to resize PDF pages as images, use PDF to JPG first, resize here, then rebuild with JPG to PDF.

Standard Image Sizes for Common Uses

Not sure what dimensions to use? Here are standard sizes for the most common contexts:

• Website hero images: 1920 × 1080 px (full-width banners), 1200 × 628 px (standard blog hero)
• Product images (e-commerce): 800 × 800 px minimum for square product photos; 1000 × 1000 px for zoom capability
• Social media — Facebook/LinkedIn: 1200 × 630 px for shared link previews
• Social media — Instagram: 1080 × 1080 px (square), 1080 × 1350 px (portrait), 1080 × 566 px (landscape)
• Twitter/X: 1200 × 675 px for in-feed images
• Email newsletters: 600 px wide maximum (most email clients cap at 600px)
• Thumbnails: 300 × 300 px for standard thumbnails; 150 × 150 px for small previews
• WordPress featured images: 1200 × 800 px is a common safe default for most themes

Why Resize Before Compressing?

Always resize images before compressing them, not after. The sequence matters because compression works on the actual pixel data present. A 4000px image compressed to 80% quality still contains 4000px of data — it's just stored less efficiently. Resizing to 1200px first, then compressing, produces a much smaller final file because there is genuinely less data to store. Compressing first and resizing after re-encodes the file a second time, potentially introducing additional quality loss for JPG images.