About Resize King
What is Resize King?
Resize King is a free, browser-based tool that resizes images for every major social media platform in seconds. Upload your logo, headshot, or any image once, and instantly download perfectly sized versions for Google Business, Facebook, Instagram, LinkedIn, YouTube, TikTok, Pinterest, X (Twitter), and WhatsApp — plus any custom dimensions you need.
Why we built it
Every social media platform uses different image dimensions. A logo that looks perfect on LinkedIn gets cropped on Instagram. A cover photo sized for Facebook looks wrong on X. Most people deal with this by guessing, using slow online tools that upload your images to unknown servers, or paying for design software they only use occasionally.
We built Resize King to solve this in the simplest possible way: one upload, every size, instantly, for free. No account required. No watermarks. No subscription.
How it works
Resize King runs entirely in your browser using the HTML5 Canvas API. When you upload an image, it never leaves your device — there is no server involved in the image processing. Your images are processed locally on your computer or phone, outputs are generated, and you download them directly to your device.
This approach has two major advantages: speed and privacy. Processing happens in milliseconds because there is no upload/download round-trip to a server. And because your image never touches our servers, there is nothing to store, sell, or breach.
What you can do with it
- Resize any image for 9 social media platforms simultaneously
- Add custom dimensions (16×16 to 5000×5000 pixels)
- Adjust background colour, zoom, fit mode, and image alignment
- Export as PNG (lossless) or WebP (smaller file size)
- Download all sizes as a single ZIP file in one click
Supported platforms
Resize King currently supports all required image sizes for: Google Business Profile, Facebook, Instagram, LinkedIn, YouTube, TikTok, Pinterest, X (formerly Twitter), and WhatsApp. We keep the size specifications up to date as platforms change their requirements.
Privacy
Your images are never uploaded to any server. All processing happens locally in your browser. We use Google Analytics (with your consent) to understand how the tool is used, and we may show ads to keep the service free. See our Privacy Policy for full details.
Contact
Have feedback, found a bug, or want to suggest a feature? Email us at hello@resize-king.com.