Drop your image here

or click to browse — JPG, PNG, WebP, GIF supported

JPG PNG WebP GIF BMP

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By Pixels

By Percent

Longest Edge

Width & Height

Aspect ratio is locked by default. Click the lock to unlock.

100%

Output: — × — px

25%

50%

75%

100%

150%

200%

Set the longest edge to

Output dimensions will appear here

Preview — click Resize to update

Preview will appear after resizing

About This Tool

How to Use the Image Resizer

1Drop your image onto the tool or click Choose Image to browse — JPG, PNG, WebP, GIF, and BMP are all supported.
2Choose your resize mode: By Pixels for exact dimensions, By Percent to scale proportionally with a slider, or Longest Edge to cap the larger dimension while the other scales automatically.
3Aspect ratio is locked by default to prevent stretching. Click the lock icon only if you intentionally need non-proportional dimensions.
4Click Resize Image to generate a live preview, then hit Download when you're happy with the result. Nothing is uploaded to any server.

When to Resize an Image

Web Publishing

A 4,000px smartphone photo on an 800px blog column is one of the most common causes of slow page load times. Always resize to the largest size the image will actually display, then compress afterward.

Social Media

Every platform re-encodes oversized images, degrading quality in the process. Use our Social Media Resizer for one-click presets, or see the 2026 size guide for exact dimensions per platform.

Print & Client Deliverables

When a client or print shop specifies exact pixel dimensions, use By Pixels mode for precise control. Our resolution guide covers target sizes for virtually every print use case.

Mixed-Orientation Batches

Longest Edge mode is ideal for standardizing a mix of landscape and portrait photos — set one pixel value and both orientations come out at a consistent size without any manual calculation.

Why Resize in the Browser

All processing happens locally using the browser's Canvas API — your image never leaves your device. That makes this tool safe for sensitive files like client photos, ID documents, or confidential product imagery that you wouldn't want passing through a third-party server. There's no software to install and no account to create, which makes it faster than opening Photoshop or GIMP for a quick resize. For a full picture of what's possible without desktop software, see our roundup of 175+ free browser-based tools. If your workflow also involves cropping, pair this tool with our Image Cropper — resizing sets overall dimensions while cropping controls exactly what's kept. Once resized, converting to WebP format typically cuts file size a further 25–35% with no visible quality loss, the format Google recommends for all web images.

Frequently Asked Questions

By Pixels — set exact width and height. Great when you need a precise output size like 1200×628 for social media.

By Percent — scale relative to the original. 50% makes the image half the size. Perfect for proportional reductions.

Longest Edge — set one dimension and the other scales automatically. Great for standardizing mixed landscape and portrait photos.

Scaling down (making smaller) has minimal quality impact and is the most common use case. Scaling up (making larger) can cause blurriness since the browser interpolates missing pixels. For web use, scaling down is always fine.

When locked, changing one dimension automatically updates the other to maintain the original proportions. This prevents your image from looking stretched or squashed. Unlock only if you intentionally want to change the image’s shape.

Instagram post 1080×1080 (square) or 1080×1350 (portrait). Facebook post 1200×630. X/Twitter post 1200×675. LinkedIn post 1200×627. YouTube thumbnail 1280×720. Pinterest pin 1000×1500. Use our Social Media Resizer for one-click presets.

The tool handles images up to 16,000px per side, though very large images (over 50MP) may be slow on lower-powered devices since all processing is done locally in your browser. Most standard photos up to 20MP process instantly.

Need advanced editing?

PaintShop Pro gives you precise pixel-level resize controls with Bicubic and Lanczos resampling for professional-quality upscaling and downscaling.

Try PaintShop Pro

Image Resizer

About This Tool

How to Use the Image Resizer

When to Resize an Image

Why Resize in the Browser

Frequently Asked Questions

What’s the difference between resizing by pixels, percent, and longest edge?

Will resizing reduce my image quality?

What does locking the aspect ratio do?

What are the current recommended social media image sizes?

Is there a maximum image size I can resize?