Free Online Converters
Convert between units, formats, number bases, time zones, and encodings instantly. These converters handle the everyday conversions people actually need: metric to imperial, JSON to CSV, Base64 to text, and dozens more. No software downloads, no file uploads, no signup. Open the tool, paste your input, get the result.
What you can convert here
Convert between metric and imperial units: length, weight, temperature, volume, area, speed.
Schedule meetings across time zones. Supports 400+ cities and automatic DST handling.
Convert between 30+ currencies using daily exchange rates (data updates hourly).
Convert text and files to/from Base64 for embedding in URLs, emails, and data URIs.
Switch between number bases — useful for programming and debugging.
Transform spreadsheets to API-friendly JSON and back, with header detection.
Convert between Roman numerals and Arabic numbers (1-3999).
Switch between UPPER, lower, Title, Sentence, camelCase, snake_case, kebab-case.
Convert between HEX, RGB, HSL, and CMYK color values for design work.
Frequently asked questions
Are the conversion rates accurate?
Currency rates use daily published reference rates. Other conversions use exact mathematical formulas.
Can I convert large files?
Most converters handle inputs up to 10MB. For larger files, split into chunks or use a desktop tool.
Do converters work offline?
Once a page is loaded, most converters work offline (except currency which fetches live rates).
Why do I get different results from another site?
Minor differences come from rounding precision. Our converters use 10+ decimal places.
Can I convert multiple values at once?
Yes — most converters accept batch input (one value per line) and return parallel output.
Try our Calculators for math and finance conversions, or Text Tools for character and encoding converters.