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Resize IMAGE

Resize your images by percentage or pixels. No server uploads. Private and fast.

Upload your images here

Drag and drop your files, or click to browse.
Supports PNG, JPG, WEBP, AVIF, GIF • Max. 50MB (GIF: 10MB)

Free & Unlimited
High Speed
Visual Quality

Resize Images Online: Change Size Fast and Effectively

Resize your photos in seconds. Define exact width and height in pixels or scale by percentage. Perfect for social media, web, or print. The process is done in your browser, without registration and maintaining the best possible quality.

How to resize an image?

1. Upload your photo

Drag and drop your images or select them from your device.

2. Choose the size

Define new pixels or scaling percentage.

3. Download

Get your resized image instantly.

Advantages of resizing images with OptimizeImg

Visual Quality

Advanced algorithms (Lanczos3) that maintain sharpness and details when changing size.

100% Private

Your photos are processed in your browser. They never go to the cloud nor leave your device.

Universal

Compatible with all modern formats: JPG, PNG, WebP, GIF and AVIF.

No Signup

Use the tool for free as many times as you want. No accounts or watermarks.

When to resize your images?

Optimize your photos for the exact medium where you are going to use them.

Social Media

Instagram and Facebook compress your photos. Upload them in the exact size (e.g. 1080x1080) for maximum sharpness.

Websites

Improve your SEO and load speed. Reduce images from 4000px to 1920px or less without losing quality.

Email Marketing

Prevent your emails from being too heavy or going to spam. Adjust the size for fast delivery.

Print

Prepare your files with the correct physical dimensions (cm/mm) for perfect printing.

Frequently Asked Questions

How can I resize an image without losing quality?
To resize an image without losing quality, follow these steps:
  • 1. Keep the aspect ratio (proportions) locked.
  • 2. Reduce the pixel size gradually or scale by percentage.
  • 3. Save in modern formats like WebP or PNG.
Our tool automatically applies professional resampling algorithms to ensure maximum sharpness.
Which image formats are supported?
You can resize images in JPG, PNG, WebP, GIF, ICO and AVIF. The tool automatically detects the original format and maintains it.
Can I resize multiple photos at once?
Yes, you can upload a full batch of images. You can apply the same reduction percentage to all or define fixed dimensions (width/height) that will apply to each image, respecting its aspect ratio if desired.
Is it safe? Are my photos uploaded to the internet?
Totally safe. Like all our tools, resizing is performed locally in your browser. Your photos never leave your device nor are they saved on any server.
What is the difference between resizing and cropping?
Resizing changes the resolution of the entire image (makes it bigger or smaller). Cropping removes parts of the image to change its framing or aspect ratio.

More Online Image Editing Tools

Discover all available tools to work with your images.

Compress Image Online

Optimize and reduce the size of your photos without losing quality.

Convert Image Format

Convert between JPG, PNG, WebP, AVIF and more formats.

Resize Image

Change photo size by pixels or percentage.

Crop Image

Crop parts of your image to improve framing.