Timer

Multi-mode Timer (Countdown & Stopwatch)

Accurate timing directly in your browser with countdown and stopwatch modes, customizable duration and quick presets. Everything runs locally for full privacy.

00:00:00 .00

Time remaining

Duration

Minutes

Seconds

To keep timing accurate, duration cannot be changed while running.

Presets

Tip: Everything runs locally in your browser. No data is uploaded.

Scientific Calculator

Perform everyday calculations and basic scientific functions directly in your browser with keyboard support and no data uploads.

Timestamp Converter

Convert Unix timestamps to date/time and back in local time or UTC, with one-click copy for seconds and milliseconds and fully local processing in your browser.

Timezone Converter

Convert between IANA time zones and see UTC plus Unix timestamps entirely in your browser with no data uploads.

Unit Converter

Convert units for length, mass, temperature, area, volume, speed and data size with adjustable precision, all computed locally in your browser.

Kinship Calculator

Free online kinship calculator. Instantly figure out family relationship titles. Runs locally in your browser for privacy.

Random Decision Maker

A fast decision helper that randomly selects from your options via list draw, wheel spin, coin flip, or dice roll. Includes algorithm selection, optional seed, and copyable results.

Random Phone Numbers

Generate random phone numbers by country with batch output, format options and one-click copy. Local-only for testing and demos.

Coupon Code Generator

Bulk-generate coupon codes with prefixes/suffixes and grouping separators. Local processing for privacy.

Emoji Picker

Browse and search emojis online, copy with one click and keep recent usage, all processed locally in your browser.

Base Converter

Convert integers between bases 2–36 using BigInt locally in your browser with zero uploads.