Free tools for makers

Browser-based utilities that solve real problems. No accounts, no paywalls, no nonsense.

Create FDA-compliant supplement facts panels from a simple markdown description. Preview in real time and download as PNG or vector SVG.

Paste or load any .md file, preview it as a styled document, and download as a PDF. Supports tables, headings, bold/italic and all standard markdown.

Find X% of Y, what percent X is of Y, percentage change, and convert between markup and margin. Instant results as you type.

Calculate your exact age in years, months, and days. See your generation, zodiac signs, planet ages, and fun milestones.

Calculate sale prices with single discounts, stacked discounts, or fixed amounts off. See how much you save instantly.

Calculate tips and split bills with friends. Quick-tap percentage buttons, pre-tax option, and round-up feature. Mobile-friendly.

Find days between dates, add or subtract days, and calculate business days. Shows breakdown in years, months, weeks, and days.

Split bills equally or with custom amounts per person. Add tip, round up, and copy per-person totals to share.

Calculate return on investment and annualized returns (CAGR). Compare two investments side by side with visual charts.

Beautify, minify, and validate JSON with syntax highlighting. Tree view, keyboard shortcuts, and drag-and-drop support.

Coming soon

Generate strong, secure passwords and passphrases. Client-side only — nothing leaves your browser.