Image Resizer Online
Resize any image to exact pixel dimensions instantly. Free, no upload, no registration. Works in your browser with full quality control.
3 Simple Steps
Upload image
Drop any JPG, PNG, WEBP or HEIC image. The original dimensions are shown automatically.
Set new size
Enter exact pixels, a percentage, or pick a preset like Full HD or Instagram.
Download
Download your resized image instantly. Original quality preserved at your chosen dimensions.
About This Tool
Resizing images is one of the most common digital tasks, needed for web publishing, social media, email attachments, printing, and developer assets. The challenge is always maintaining quality while hitting the right dimensions for each platform.
SiteConversor's image resizer gives you complete control: enter exact pixel dimensions, scale by percentage, or pick from social media presets. The aspect ratio lock ensures your images never look stretched or distorted.
All resizing happens locally using the HTML5 Canvas API — your images are drawn onto a new canvas at the target dimensions and exported as a fresh file. This means zero uploads, zero waiting, and zero privacy concerns. Your files stay on your device from start to finish.
The tool accepts JPG, PNG, WEBP, HEIC (iPhone), TIFF, and BMP formats. Output is always at the highest quality possible for the chosen format. For web use, we recommend resizing and then compressing — use our Image Compressor tool as the next step for optimal file sizes.
Frequently Asked Questions
Will resizing reduce image quality?expand_more
Downscaling (making smaller) preserves quality very well — fewer pixels means sharper relative detail. Upscaling (making larger) can introduce blurriness because pixels are being interpolated. For best results, avoid upscaling more than 120–150% of the original dimensions.
Can I resize without changing aspect ratio?expand_more
Yes. Enable the 'Lock Aspect Ratio' toggle before entering dimensions. When you type the new width, the height updates automatically to maintain the original proportions.
What is the maximum image size I can resize?expand_more
There is no hard file size limit, but very large images (50+ MB or 10,000+ pixels wide) may require significant RAM. Most modern computers handle images up to 8000×8000 pixels without issues.
What are the best dimensions for social media?expand_more
Instagram profile: 320×320. Instagram post: 1080×1080. Facebook cover: 820×312. Twitter/X header: 1500×500. YouTube thumbnail: 1280×720. LinkedIn cover: 1584×396.
Can I batch resize multiple images?expand_more
Yes — upload multiple images at once and all will be resized to the same target dimensions. Each file is downloaded separately or bundled in a ZIP.
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