Free online tools.

Calculate percentages, increases, decreases, differences and more. All modes in one place.

Split bills and calculate tips instantly. Works for any party size.

Convert length, weight, temperature, speed, area, volume and more.

Count words, characters, sentences and paragraphs. Great for essays, SEO and social media.

Merge, split, compress and rotate PDFs. No upload to server — everything runs in your browser.

Convert between HEX, RGB, HSL and HSB. Pick colors visually with a built-in color wheel.

Encode and decode Base64 strings instantly. Supports text and file input.

Convert Unix timestamps to human-readable dates and back. Supports milliseconds.