All tools

Convert currencies online with current ECB reference rates. PLN, EUR, USD and dozens of other pairs — no sign-up.

Calculate days between two dates, working days, and the day of the week — useful for contracts and deadlines.

Compare local times across cities, see the hour difference, and spot locations on a simple world map.

Convert length, mass, temperature and volume: cm↔in, kg↔lb, °C↔°F and more.

Add or remove VAT (23%, 8%, 5%), compute net/gross, and simple percentages of an amount.

Calculate exact age in years, months and days — or how many days remain until a date.

Estimate how large an audio/video file will be at a given bitrate and duration — or the bitrate that fits a MB limit.

Generate a strong password locally in your browser. Set length and character sets — nothing is sent to a server.

Count characters, words, sentences and paragraphs — handy for SEO, social posts and form limits.

Create a QR code from a link or text and download it as PNG. Runs locally in the browser.

Convert colors between HEX, RGB and HSL and check WCAG contrast against a background.

Encode text to Base64 or decode Base64 back. Locally, without uploading data.

Convert a Unix timestamp (seconds/ms) to a date and back. Useful for logs and APIs.

Generate UUID v4 (random) with one click. Create many at once if you need.

Compute SHA-1, SHA-256, SHA-512 or MD5 of text. Locally via Web Crypto.