Converter Tools
Currencies, units, color codes, and Kindle ebooks - 4 tools
About Converter Tools
Four converters share this page. Currency Converter applies the rates ExchangeRate-API publishes each day and charts a pair's history from Frankfurter's central-bank reference rates. Unit Converter covers 12 categories, from length and pressure to fuel economy, with exact conversion factors. Color Converter edits one color as HEX, RGB, HSL, HSV, or CMYK and shows its WCAG contrast on white and on black. MOBI to EPUB rebuilds a DRM-free Kindle book as an EPUB 3 file in your browser.
How to use Converter Tools
- 1Open the converter for what you have: an amount of money, a measurement, a color code, or a .mobi, .azw, or .azw3 file.
- 2Type the value and choose the two currencies or units, or pick the ebook file.
- 3Read the result: Currency Converter adds the unit rate and the amount in up to 20 popular currencies; Color Converter fills in every format at once.
- 4Click "Copy" in Color Converter, select the result in the other converters, or download the EPUB, which keeps the name of the original file.
Frequently asked questions
How current are the exchange rates?
Daily: ExchangeRate-API updates its table once a day, and the page shows when it was published and when the next update is due. The history chart uses Frankfurter's reference rates, daily up to one year, weekly over 5 years, and monthly over 10.
Is anything sent when I convert?
Yes, for currencies only. Your browser downloads the day's rate table, the same for every visitor, and the history chart sends the two currency codes you picked to Frankfurter. The amount you type is not sent, and units, colors, and ebooks are converted on the page.
Can MOBI to EPUB convert a book bought on Amazon?
No, not one with DRM. The converter reads DRM-free MOBI, AZW, AZW3, and PRC files and does not remove copy protection, so use it for books you received without DRM.
Which color formats can I type?
Five: HEX with 3, 4, 6, or 8 digits, RGB, HSL, HSV/HSB, and CMYK, each in its own editable field. Color names such as rebeccapurple are not accepted.
Tips and tricks
- ✓Unit Converter reads "1,000" as ambiguous and asks again; type 1000 for a thousand.
- ✓Color Converter computes contrast with the opacity applied, on white and on black, before you pick a text color.
- ✓Switch the currency chart from 1 week to 10 years; 8 currencies, including BGN and HRK, had no history when we checked on October 3, 2026.
- ✓For a PDF of the ebook instead, use MOBI to PDF in PDF Tools, which sends the prepared pages to our server to print the PDF.