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Free online tools that run entirely in your browser.
No uploads. No installs. No tracking. Just open and use.
How much BTC do you need to retire? Live price data, DCA backtester, and three lifestyle tiers (minimal / comfortable / rich).
Calculate BTC trading profit, loss, ROI, and fees instantly. Includes break-even price and custom fee rates.
What if you had bought Bitcoin earlier? See how much your investment would be worth today with real historical price data.
Backtest your Bitcoin dollar-cost averaging strategy with real historical data. Compare DCA vs lump sum investing.
Convert between Bitcoin (BTC), Satoshi (sats), and USD instantly. Live prices and quick reference table.
Compress images online free — reduce JPG, PNG, WebP file size in your browser. No upload, instant download.
Bulk flip images online free — batch mirror 50+ photos at once, horizontal or vertical. No upload, no install.
Rotate images 90°, 180°, 270° instantly. Fix orientation issues in bulk, no upload required.
Convert Markdown to JSON online — bidirectional MD↔JSON converter. Also converts JSON arrays to Markdown tables.
Convert Markdown to PDF free online. GitHub, Academic & Minimal styles. A4 & Letter. No upload required.
Free septic tank size calculator online — get tank gallons, drain field sqft & pumping schedule by bedrooms & soil type. No install.
Pressure washing cost calculator free online — instant price estimate for driveway, patio, siding & roof. No upload, no install.
Countertop square footage calculator free — add multiple sections in inches or feet, get sqft with overage & material cost estimates. No install.
Grade curve calculator online free — linear scale, square root curve & bell curve (z-score) methods. Get curved % and letter grade instantly.
Car wrap cost calculator free online — estimate vinyl wrap material & labor by vehicle type and coverage. No install.
LTL linear feet calculator free online — enter pallet dimensions to get freight linear feet, freight class & rate estimate. No install.
Roof load calculator free online — calculate snow load, dead load & total psf with ASCE 7 slope factors. No install.
Free P&L statement calculator online — add revenue, COGS, expenses to get gross profit, operating income & net margin. No install.
KPI calculator free online — track weighted KPI scores, achievement rates & performance levels across multiple metrics. No install.
Mid-term rental calculator free online — calculate MTR cashflow, cap rate & cash-on-cash return with integrated mortgage calculator. No install.
Calculate how much time you save listening to audiobooks at different playback speeds.
Chrome extension for downloading Instagram images and videos. Fast and secure — 2,000+ active users.