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 to PNG, JPG, WebP, AVIF, JPEG XL, GIF, BMP, TIFF or ICO (HEIC too), compress and resize them in your browser. Nothing is 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
- Electricity Cost Calculator
- Fuel Cost Calculator
- Gross to Net Salary Calculator (Germany)
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.
- Aspect Ratio Calculator
- Box Shadow Generator
- Color Converter & Contrast Checker
- Color Palette Generator
- Colors from Image
- CSS clamp() Generator
Developer
Formatters, testers and helpers for everyday coding.
- chmod Calculator
- Code Formatter & Minifier
- Cron Expression Explainer
- IBAN Validator
- JSON ↔ YAML ↔ CSV ↔ TOON Converter
- JSON Compare
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.
- Encrypt Text & Files
- Hash Generator
- HMAC Generator
- Password Generator
- Password Hash Generator
- Password Strength Checker
Music
Tempo, frequencies, chords, scales and a metronome.
PDF & Documents
Merge, split, rotate and create PDFs – without uploading.
- Add Page Numbers to PDF
- Add Watermark to PDF
- Compress PDF
- Edit or Remove PDF Metadata
- Images to PDF
- Merge PDF
Radio & RF
Radio links, antennas, cable loss, dBm, SWR and LoRa.
- Antenna Array Simulator
- Antenna Length Calculator
- Coax Cable Loss Calculator
- dBm Converter
- Link Budget Calculator
- LoRa Airtime Calculator