Practical tools for everyday business work.

Calculate fill rate, unfilled impressions and the revenue equivalent of unfilled inventory.

Translate sessions, pages per session, ad slots and fill rate into page views, ad requests and served impressions.

Estimate revenue for one ad placement from impressions, fill rate, viewability and eCPM.

Work backwards from a publisher revenue target to the impressions, ad requests and page views required.

Calculate average order value from total revenue and number of orders for a consistent reporting period.

Calculate customer churn from starting customers and customers lost during the same period, with retained customers and the retention complement shown.

Estimate gross-margin customer lifetime value from average order value, annual purchase frequency, gross margin percentage and customer lifespan.

Calculate customer retention from starting customers, ending customers and new customers acquired, while keeping cohort growth separate from retention.

Calculate contribution per unit, contribution margin, break-even units and break-even revenue from fixed costs, selling price and variable cost per unit.

Calculate break-even CPA from average order value and contribution margin.

Calculate break-even CPC from conversion rate and contribution available from each conversion.

Estimate CAC payback from acquisition cost and monthly customer contribution after gross margin and service cost.

Add a text or logo watermark to JPG, PNG and WebP images with position, opacity, scale, margin and rotation controls directly in your browser.

Remove an image background locally in your browser and export the isolated subject as a transparent PNG without uploading the source image.

Blur an image background while keeping the main subject sharp using local browser inference and no source-image upload.

Reduce image file size with transparent quality controls and local processing where browser support permits.

Encode and decode Base64 locally for text or files, use Base64url and Data URIs, detect pasted input, drag and drop files, and preserve binary bytes.

Generate SHA-256, SHA-384 or SHA-512 hashes locally with hex, Base64 or Base64url output using the browser Web Crypto API.

Format HTML locally with consistent indentation and line wrapping using a standards-aware parser and deterministic formatter settings.

Format, validate, repair, minify and sort JSON locally, then inspect its tree, search paths and values, or compare structures with no upload.