Smartweb.tools Free online image resizer. Resize JPG and PNG images to exact pixel dimensions with aspect ratio lock. No upload needed — runs in your browser.

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Image Resizer

Resize images by width and height in your browser for websites, profiles, thumbnails and upload forms.

Image resizer — resize images to exact pixel dimensions

This free online image resizer lets you set a specific width and height in pixels and download the resized output instantly. The aspect ratio lock prevents distortion — changing one dimension automatically updates the other to keep the image proportions correct.

Resizing images before uploading saves storage space on your hosting account and ensures images fit the design requirements of your website, social media profile, or document without being stretched or cropped by CSS.

Common image size targets

  • Open Graph / Facebook share: 1200×630 px
  • Twitter Card: 1200×600 px
  • LinkedIn post image: 1200×627 px
  • YouTube thumbnail: 1280×720 px
  • WooCommerce product: 800×800 px
  • Profile avatar: 400×400 px

Upscaling vs downscaling

Downscaling (making an image smaller) always works well. Upscaling (making an image larger than the original) creates a blurry result because there is no new pixel data to add. For best results, always start with an image equal to or larger than your target size.

How to use Image Resizer

  1. Upload your image by clicking the drop zone or dragging a file in.
  2. Set the target Width in pixels — Height updates automatically with ratio lock on.
  3. Disable ratio lock if you need to set width and height independently.
  4. Adjust Quality if needed, then click Resize & Download.

Why this tool is useful

  • Aspect ratio lock prevents accidental distortion.
  • Prepares images to exact social media dimensions without external software.
  • Reduces upload file size before adding to a CMS, store or email platform.
  • Browser-based — your image is never sent to a server.

Example use cases

Prepare a hero banner at 1200×630 for Open Graph sharing. Resize product photos to 800×800 for WooCommerce. Create a YouTube thumbnail at 1280×720 from a full-size screenshot. Reduce an email header image to 600×200 to stay within the safe zone for email clients.

Frequently asked questions

Is this tool free to use?

Yes. Smartweb.tools tools are free to use without credits, payment or required membership.

Do I need to create an account?

No account is required for the public tools. Open a tool, add your input and use the result immediately.

Is my data stored?

Most browser tools are designed to process common inputs in your browser. If a tool or contact form requires submitted data, the page will explain what is needed and why.

Related tools

  • Image Compressor — Compress JPG, PNG and WebP images online while keeping quality balanced for websites, blogs and apps.
  • PNG to JPG Converter — Convert PNG images to JPG format quickly in your browser.
  • JPG to PNG Converter — Convert JPG images to PNG format for editing and transparent workflows.