Image Resizer
Resize and compress JPEG, PNG, and WebP images in your browser.
Upload an Image
Click to browse your files. Supports JPG, PNG, and WebP. All processing happens locally in your browser.
What Is an Image Resizer?
An image resizer is a tool that changes pixel dimensions and optionally compresses file size. This page uses the HTML5 Canvas API in this tab — select a JPEG, PNG, or WebP, set width or height, and download the result. Tool inputs stay in the browser.
Beyond basic resizing, the tool handles format conversion and compression quality. Switch from PNG to JPEG to reduce a screenshot from 2MB to 150KB. Resize a hero image from 4000px wide to 1400px for the web. All changes preview instantly before you download.
How to Use the Image Resizer
- 1 Upload your image.
Click to select an image from your device, or drag and drop a JPEG, PNG, WebP, or GIF file onto the tool. The original dimensions and file size are shown immediately.
- 2 Set target dimensions.
Enter a target width or height in pixels. Enable proportional scaling to maintain the original aspect ratio so the image is not distorted.
- 3 Choose output format and quality.
Select JPEG for photographs (smaller file size) or PNG for images with transparency or text. For JPEG, use the quality slider — 80% quality typically reduces file size by 60–70% with minimal visible difference.
- 4 Download the resized image.
Click Download to save the result directly to your device. Tool inputs stay in the browser.
Who Is This For?
Bloggers and content creators who regularly upload images to a CMS and want to reduce file sizes before uploading to improve page load speed without installing Photoshop.
Developers preparing images for web performance optimization — resizing hero images, compressing product photos, or converting PNGs to JPEG to meet Core Web Vitals targets.
Anyone who needs to quickly reduce an image's dimensions or file size without installing software, creating an account, or uploading a photo to a cloud service.
Key Benefits
Tool inputs stay in the browser. The Canvas API processes the file in this tab.
No paid plans. Processing runs in this browser; very large images may be limited by your device.
Upload, resize, and download in seconds. No sign-up, no email — tool inputs stay in the browser.
Accepts multiple input formats and outputs JPEG or PNG — covering every common web image workflow.
Common Image Resizing Mistakes
- ✗Resizing up from a small original — enlarging an image beyond its native resolution adds pixels through interpolation, producing a blurry or pixelated result; always start with the highest-resolution source available.
- ✗Ignoring aspect ratio when entering custom dimensions — manually setting both width and height to non-proportional values stretches or squishes the image; lock the aspect ratio unless distortion is intentional.
- ✗Using JPEG for images with transparency — JPEG does not support alpha channels; transparent backgrounds are filled with white on export; use PNG when transparency must be preserved.
For a complete image workflow, pair the resizer with our QR Code Generator to embed resized images into QR outputs, or use the Color Picker to extract and match colors from your resized images.
For a comprehensive guide to web image formats, compression trade-offs, and browser support, see the MDN Image file type and format guide.
Choosing the Right Image Format
JPEG (JPG)
Best for photographs with millions of colors. Uses lossy compression — dial down the quality slider to aggressively reduce file size at the cost of some image artifacting. Ideal for web photos.
PNG
Best for transparent backgrounds, logos, illustrations, and UI screenshots with sharp text. PNG is lossless, so quality is preserved — but files are generally larger than JPEG.
WebP
A modern format from Google offering 25–34% smaller files than JPEG at equivalent visual quality. Supported by all major browsers. Highly recommended for web performance optimization.
Common Use Cases
Blog and CMS image optimization
Resize and compress photos to under 200KB before uploading to WordPress, Webflow, or any CMS — improving page load times and Core Web Vitals scores without installing plugins.
Product photo preparation
Scale high-resolution product photos from a camera (5000px+) down to 1200px wide for e-commerce listings, reducing page weight and keeping images at display dimensions.
Email attachment size reduction
Compress oversized photos before attaching to email — converting a 4MB camera shot to a 200KB JPEG makes it easy to send without hitting attachment limits.
Social media image preparation
Resize images to exact platform dimensions — 1200x630px for Open Graph, 1080x1080px for Instagram — before uploading to avoid platform-side compression artifacts.
Frequently Asked Questions
Does this image resizer run in the browser? ▼
Yes. This tool uses the browser's Canvas API to resize images entirely in your browser. Tool inputs stay in the browser.
Is this image resizer free? ▼
Yes. This Image Resizer is free to use now — ads are not live yet — with no account required. Processing uses the HTML5 Canvas API in this browser; very large images may be limited by your device. The site uses aggregate Google Analytics.
What image formats are supported? ▼
JPEG, PNG, WebP, and GIF are supported as input. JPEG and PNG are supported as output. When saving as JPEG, the tool applies lossy compression which significantly reduces file size. PNG preserves full quality but produces larger files. WebP input is converted to your chosen output format.
What is the best image size for a website? ▼
Most web images should be under 200KB. Hero images can go up to 500KB. Product images should be 100–300KB. WebP format typically achieves 25–34% smaller file sizes than JPEG at equivalent visual quality. Serving an image at its actual display dimensions — rather than scaling down in CSS — is one of the easiest Core Web Vitals improvements you can make.
What is the difference between JPEG, PNG, and WebP? ▼
JPEG uses lossy compression and is best for photographs with gradients and complex colors. PNG uses lossless compression and is best for images with transparency or sharp text like logos and screenshots. WebP is a modern format that achieves smaller file sizes than both JPEG and PNG at comparable quality, and is now supported by all major browsers.
Why does resizing matter for website performance? ▼
Serving properly sized images directly impacts Google's Core Web Vitals — specifically LCP (Largest Contentful Paint). If you upload a 4000×3000 photo to use as a 300×200 thumbnail, the browser still downloads the full multi-megabyte file before scaling it in CSS. Resizing the source file to match its display dimensions can reduce payload by 90%, dramatically improving page speed and search rankings.
This tool is provided for informational and educational purposes only. Results are not a substitute for professional advice.
Free Tools Alert
Get new tools, templates, and calculators in your inbox. No fake subscriber counts.
No spam. One-click unsubscribe.