Convert timestamps between formats, add or subtract time with correct calendar arithmetic, and see the result around the world.
Months and years are calendar arithmetic, not fixed durations: 31 January plus one month is 28 February, and 29 February plus one year is 28 February. Days and weeks keep the wall-clock time across a daylight-saving change rather than drifting by an hour.
Convert length, mass, temperature, area, volume, speed, data and time — with every unit in the category shown at once.
Convert between decimal, hex, binary and octal at any size, with bitwise operations and a bit-by-bit view.
Shrink JPG, PNG, WebP and AVIF images in your browser. No upload, no account, no watermark.
Add a logo or signature watermark to an image, with control over position, size and opacity. Nothing leaves your browser.