Translate between units, currencies, and data formats with 10 offline converters in one click. The unit converter turns 100 km into 62.1 miles and 0°C into 32°F with exact factors. The currency converter tracks 150-plus currencies with live rates and an offline fallback, so 100 USD to EUR works anywhere. The JSON-CSV tool maps a 1,000-row array to spreadsheet columns instantly. For example, 1 kg equals 2.205 lb and a 2-item JSON list becomes a 2-row sheet. Each tool page answers common questions in its FAQ, private by design.
Popular in Converters: Unit Converter · Currency Converter · JSON-CSV Converter
Questions? Each tool page has an FAQ — start with the Unit Converter FAQ. See also our testing methodology.
Reviewed by the Tool4SaaS Editorial Team · Authors · How we test
At their core, they are 10 free offline converters for units, currencies, and data formats with no signup. The Unit Converter turns 100 km into 62.1 miles and 0°C into 32°F with exact factors, while Currency Converter tracks 150-plus currencies. Everything calculates locally after load.
Try first Unit Converter, Currency Converter, and JSON-CSV Converter for everyday swaps. Convert 100 USD to EUR with live rates and offline fallback, map a 1,000-row array to columns instantly, and turn 1 kg into 2.205 lb. Each card below runs free with worked examples.
Definitely — all conversion tools are free with no account or watermark and run locally. JSON-CSV Converter maps a 1,000-row array and a 2-item list into a 2-row sheet without uploading data. Only currency live rates need internet, clearly noted. Your 100 km to 62.1 miles stays private.
Visit once Unit Converter while online and leave the tab open for offline use. Most converters then compute locally without internet, so 100 km to 62.1 miles and 0°C to 32°F still resolve. Closing the tab clears entries. No install is needed, though currency live rates pause offline.
See each tool FAQ for factors and edge cases — start with Unit Converter FAQ covering 1 kg equals 2.205 lb and 100 km to 62.1 miles. You will find 100 USD to EUR notes and 1,000-row mapping tips. Check our testing methodology and contact page for corrections or ideas.