Image Resizer ? Free Online Image Resizer by Chochi
Upload a JPEG, PNG, WebP or AVIF image and set your target dimensions with this free image resizer online. The tool resizes your image while preserving quality, with optional aspect ratio lock and format conversion. Free, secure, no signup ? built for webmasters and developers by Chochi.
How it works: Choose an image (JPEG, PNG, WebP or AVIF; max 10 MB), enter a target width and/or height in pixels, choose whether to keep the aspect ratio, pick an output format, then click Resize Image. You get a download and a comparison of original vs resized dimensions and file size.
What this tool does
This image resizer online takes your uploaded JPEG, PNG, WebP or AVIF and scales it to the exact pixel dimensions you specify. You control the target width and/or height, whether to keep the original aspect ratio (no stretching), and which format to output ? including WebP for modern browsers. Processing runs on our server; files are not stored and no account is required.
Typical uses: resizing product photos before uploading to an e-commerce platform, preparing hero images at the right pixel width, scaling user-submitted photos for a web app, or reducing image dimensions before running them through a separate compression step. The tool automatically serves the smaller of the two files ? so if the resized version would be larger (e.g. when upscaling), you get the original back instead.
Privacy is built in. Uploaded files are processed in a secure temporary directory and deleted automatically after download. Nothing is logged or retained beyond what the conversion requires.
How to use the tool
- Upload your image ? JPEG, PNG, WebP or AVIF, up to 10 MB.
- Enter your target width and/or height in pixels (e.g. 1200 for width).
- Choose whether to keep the aspect ratio ? "Yes" is recommended to avoid distortion.
- Select an output format ? WebP is recommended for web use; keep original if unsure.
- Click Resize Image and wait a moment for processing.
- Check the result ? original and new dimensions plus file size savings are shown.
- Click Download Resized Image and use it on your site or in your workflow.
SEO and performance benefits of resizing images for website
Serving images at exactly the dimensions they are displayed is one of the most effective image optimizations available. A 4000 px wide photo displayed in a 800 px column wastes bytes on every page load ? the browser downloads far more data than it needs. Resizing before upload means smaller transfers, faster LCP (Largest Contentful Paint), and better Core Web Vitals scores. Google uses page speed signals in ranking; faster-loading pages also convert better and have lower bounce rates.
Best practice: match your image dimensions to the actual display size (or double it for high-DPI/retina screens), then output in WebP where your CMS supports it. Combine this resizer with the Online Image Optimizer for maximum savings ? resize to the right dimensions first, then compress. Together you can often reduce image weight by 50?70% without visible quality loss, which meaningfully improves Core Web Vitals and load time for mobile visitors.
Frequently asked questions
What image formats can I resize?
You can resize JPEG, PNG, WebP, and AVIF images up to 10 MB. These cover the most common formats used on the web and in modern cameras and phones.
Will resizing reduce my image file size?
Usually yes ? smaller dimensions mean fewer pixels, which means smaller files. The tool automatically serves the smaller of the resized and original files, so you never end up with a larger download than you started with.
What does 'keep aspect ratio' mean?
The image proportions stay the same ? no stretching or squishing. Set one dimension and the other is calculated automatically so the image looks natural. If you need an exact size in both dimensions (e.g. a square crop), choose "No ? stretch to exact size" and enter both values.
What output format should I choose?
WebP for best web performance ? it's 25?35% smaller than JPEG at similar quality and is supported by all modern browsers. JPEG for photos where universal compatibility matters. PNG for images with transparency you want to preserve. If unsure, WebP is the safe default for web use.
Can I use this for WordPress or Shopify images?
Yes ? resize images to your theme's content width (e.g. 1200 px) before uploading to your media library or product gallery. This reduces page load time and improves Core Web Vitals scores, which matters for both user experience and SEO on WordPress and Shopify stores.
Is there a maximum file size?
Yes ? 10 MB per image and a maximum of 8192?8192 px dimensions. These limits keep processing fast and stable for everyone. For very large source files, consider cropping or reducing resolution before uploading.
Are my images stored on your server?
No ? files are processed temporarily and automatically deleted after you download the result. We don't store your images, log file contents, or use uploads for any purpose other than generating the resized download. No account or sign-up is required.
How is this different from the Image Optimizer?
The Resizer changes dimensions ? it makes the image physically smaller (or larger) in pixels. The Online Image Optimizer compresses without changing dimensions. Use both together for best results: resize to the right pixel dimensions first, then run through the optimizer to compress the file further.
Need More Than Free Tools?
This free tool is built by Chochi, a web development, performance, and SEO studio. We help businesses get faster sites, better Core Web Vitals, and more organic traffic.
If you want expert help optimising images site-wide, improving page speed, or boosting search visibility, we're here.
- Book a free performance consultation ? we'll review your site and suggest concrete improvements.
- Request a website optimization audit ? get a clear plan for speed, images, and Core Web Vitals.
No pressure. Our web performance and SEO services are here when you're ready.