Free tools that stay on your device.
Edit photos and PDFs, convert units and currencies, format JSON — without an account and without uploading your files.
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- Private by default
- Works offline
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Calculators, converters, and the image, PDF and text editors run entirely in this browser. The few that need a server — domain and network lookups, downloads — say so on the tool itself. Read the privacy policy.
The TDEE calculator turns height, weight and activity into a maintenance figure you can actually plan around.
For developers
10 formatters, encoders and debugging tools — all in-browser.
Latest guides
Short explainers tied to the tools above.
BMI vs Body Fat Percentage — Which Tells You More?
BMI is a quick screening tool; body fat reflects composition. Learn what each number means, where BMI fails, and how to interpret both together.
Compound Interest and SIP — How Your Money Grows Over Time
Lump sums and monthly SIPs both compound, but differently. See the formulas, a worked 10-year example, and what rate and inflation assumptions hide.
How Currency Conversion Works — Rates, Spreads, and Real Cost
Exchange rates move constantly. Learn mid-market vs retail rates, how fees hide in spreads, and how to convert amounts with realistic expectations.