Is my image uploaded to a server?

No. This tool processes images entirely in your browser using HTML5 Canvas. Your files never leave your device.

What image formats are supported?

PNG, JPG/JPEG, and WebP formats are supported for both input and output.

Can I maintain the aspect ratio while resizing?

Yes. Enable the 'Lock Aspect Ratio' option and changing one dimension will automatically update the other.

What is the maximum image size I can resize?

There is no strict limit, but very large images (above 20MP) may be slow depending on your device. The tool works entirely client-side.

Image Resizer — Resize Images Online Free

🖼️

Click to upload image or drag & drop here

PNG · JPG · WebP · BMP · GIF

Result

Dimensions: — File Size: — Reduction: —

About Image Resizer

Resize any image to exact pixel dimensions or scale by percentage — completely in your browser. No file is uploaded to any server.

Features

Resize by exact width × height (pixels)
Scale by percentage (1%–200%)
Lock aspect ratio to avoid distortion
Social media & standard presets
Output as JPG, PNG, or WebP
Adjustable JPEG quality
100% private — works offline

Common Use Cases

Resize photos for WhatsApp or email
Create Instagram / Story images
Reduce image size for websites
Fit images to specific dimensions
Batch resize with multiple uploads

Image Size Requirements for Every Platform

Every platform has specific image dimension requirements — upload the wrong size and your image gets auto-cropped in unflattering ways, appears blurry, or gets rejected entirely. Knowing the standard dimensions saves you from the frustration of a LinkedIn profile picture that shows only your forehead, or a WhatsApp DP that cuts off your face.

Standard Image Sizes You Should Know

WhatsApp DP: Displayed as a circle. Upload at least 500×500 px square. It gets cropped to a circle, so keep important content in the centre.
Instagram post (square): 1080×1080 px. Portrait: 1080×1350 px. Landscape: 1080×566 px.
Instagram Story / Reels: 1080×1920 px (9:16 vertical).
YouTube thumbnail: 1280×720 px (16:9). Under 2 MB.
LinkedIn profile photo: 400×400 px minimum, up to 7680×4320 px. Displayed at 200×200 px.
Facebook cover photo: 820×312 px on desktop, 640×360 px on mobile.
Twitter/X header: 1500×500 px.
Passport photo (India): 35×45 mm at 200 DPI = approximately 276×354 px. Background must be white.
Aadhaar/PAN update photo: UIDAI accepts JPG up to 200 KB. Resize and compress before uploading.

Resize by Percentage vs Pixels

Use pixel resizing when you need exact dimensions for a specific platform. Use percentage resizing when you want to scale an image proportionally — for example, "make this image half the size" for email or WhatsApp without worrying about exact pixel numbers.

Aspect ratio lock: Always keep "Lock aspect ratio" enabled unless you specifically need a non-proportional resize. Stretching an image (different width/height ratios) makes people look distorted — a common mistake in business banners and profile pictures.