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See exactly how your page will look in Google search results, with pixel-accurate truncation for desktop and mobile.
Calculate your Body Mass Index in metric or imperial units, with the WHO weight category and the healthy weight range for your height.
Add a text or logo watermark to a video with a live preview. Nine positions, adjustable opacity, and a tiled mode that survives cropping.
Create Open Graph tags for Facebook, LinkedIn, WhatsApp and Slack, with a live preview of how your share card will look.
Generate Twitter (X) card meta tags with a live preview — summary, summary_large_image, app and player cards.
Inspect every response header a URL returns, with a security header audit covering HSTS, CSP, X-Frame-Options and more.
Generate valid JSON-LD structured data for 12 schema types — Article, Product, LocalBusiness, FAQ, Event, Recipe and more — with required fields marked.
Generate random numbers in any range — one or thousands, whole or decimal, with or without repeats — drawn in your browser.
Generate an MD5 hash of text or a file in your browser, with the digest updating as you type and nothing uploaded.
Generate an HMAC signature with MD5, SHA-1, SHA-256, SHA-384 or SHA-512 and a secret key — the way webhook signatures are verified.
Encode text or a file to Base64 in your browser, with URL-safe output, MIME line wrapping and ready-to-paste data URIs.
Decode Base64 back to text or a file in your browser — accepts URL-safe input, missing padding and data URI prefixes.
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