Free online calculators & tools

Resize images, format JSON, calculate costs, and more.

Free to use. No sign-up. Your inputs stay in this browser.

66 tools

Useful starting points

Resize images by pixels, percentage, or dimensions.

Reduce image file sizes while tuning quality.

Format and validate JSON right in your browser.

Calculate a percentage or compare values.

Turn text, links, and WiFi details into QR codes.

Make text banners and image art from characters.

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Tools are free to use without creating an account.

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