Tools that just work.
Converters, encoders, calculators and developer utilities. Everything runs locally in your browser — your data never leaves your device.
Popular
QR Code GeneratorCreate QR codes for links, text, Wi-Fi access, contacts (vCard) and emails. Custom colors, download as PNG or SVG — free, no sign-up, no tracking.Password GeneratorCreate strong random passwords and memorable passphrases with a strength meter. Generated locally with your browser’s secure random generator.Percentage & VAT CalculatorCalculate percentages, percentage change, increases and discounts, and convert between net and gross prices including VAT.Image Converter & CompressorConvert images between PNG, JPG, WebP and AVIF, compress them and resize them — in bulk, right in your browser. Your photos are never uploaded.What Is My IP?Shows your public IP address (IPv4 or IPv6), your internet provider and the approximate location derived from it — plus what your browser reveals about you.Unit ConverterConvert length, weight, temperature, volume, area, speed, time, data size, pressure and energy units — all results at a glance.Word & Character CounterCount words, characters, sentences and paragraphs with reading time — and transform text: change case, sort lines, remove duplicates and more.Online Timer & StopwatchCountdown timer with alarm sound and presets (incl. Pomodoro) and a stopwatch with lap times — runs in your browser, also in the background.
All categories
Converters
Units, currencies, time and more.
Calculators
Percentages, VAT, interest, dates and timers.
- BMI Calculator
- Compound Interest & Savings Calculator
- Date Calculator
- Loan Calculator
- Online Timer & Stopwatch
- Percentage & VAT Calculator
Generators
QR codes for links, Wi-Fi, contacts and more.
Text
Count, transform and compare text.
Images & Media
Convert and compress images right in your browser.
Design
Colors, contrast and other design helpers.
Developer
Formatters, testers and helpers for everyday coding.
- chmod Calculator
- Cron Expression Explainer
- IBAN Validator
- JSON ↔ YAML ↔ CSV ↔ TOON Converter
- JSON Formatter & Validator
- JSON to TypeScript
Encoding
Base64, hex, URL encoding and text representations.
Network
IP addressing, subnets and network calculations.
- Bandwidth Calculator
- CIDR Range Calculator
- DNS Lookup
- E-Mail Security Check
- HTTP Header Checker
- HTTP Status Codes
Security
Hashes, checksums and cryptographic helpers.
Music
Tempo, frequencies, chords, scales and a metronome.
PDF & Documents
Merge, split, rotate and create PDFs – without uploading.