Online Image Resizer

Resize images online for free — fast, private, and 100% local. Works with JPG, PNG, GIF, WebP, HEIC and exports JPG/PNG/WebP/AVIF. Ideal for social, blogs, and web.

Upload Image

Drop, select, or paste an image to start.

  • Local processing for privacy
  • Custom dimensions & presets
  • Quality & format control
  • Aspect ratio lock
  • Smart Cover (subject-aware crop)
  • AI background removal (optional)
Working…

Initializing…

Try ImgTool.app for Resizing Images Online

ImgTool.app processes everything client-side. Whether you're preparing photos for e-commerce, blogs, or social media, our online image resizer helps you achieve perfect dimensions quickly. Use Smart Cover to keep key content when changing aspect ratios, or iPad presets for wallpaper sizing.

How to Resize Images for Social Media

For Instagram, select 1080×1080 (posts) or 1080×1920 (stories). For YouTube thumbnails, use 1280×720. Use Contain to avoid distortion or Smart Cover to crop intelligently.

Tips for Bulk Resizing Images Online

If you have multiple files, head to our bulk image resizer. It’s ideal for photographers and marketers needing to resize images in batches.

See it in action

Same image, three sizes — a quick visual of resized output.

Orange cat pilot illustration (large)
Large (≈360 px)
Orange cat pilot illustration (medium)
Medium (≈240 px)
Orange cat pilot illustration (small)
Small (≈160 px)

Image Resizer FAQ - Answers to Common Questions

Upload your image, set dimensions or use presets, adjust settings, and download the resized image — all locally in your browser.

Yes, 100% free with no account needed. Your images never leave your device.

Supports JPG, PNG, GIF, WebP, and HEIC for input, with output in JPG, PNG, WebP, or AVIF.

Yes, use presets for Instagram posts/stories, YouTube thumbnails, Facebook covers, and more.

Absolutely, the tool is fully responsive and works on desktops, tablets, and mobiles.

Use our quality slider to maintain high resolution while resizing. Lock aspect ratio to avoid distortion.

Yes, our bulk image resizer tool allows you to process multiple files at once for free.

Our AI-powered background removal uses local browser processing to detect and remove backgrounds, creating transparent PNGs.