Powerful tools for developers

Fast, secure and free online tools for conversion, generation and testing. Everything runs locally in your browser.

Convert Coordinates

Convert coordinates between WGS84 (GPS), SWEREF99 TM and RT90. Batch import, map view and address lookup.

Generate Password

Create strong, secure passwords and passphrases. Works offline and all data stays in your browser.

Test Data Generator

Generate realistic Swedish test identities with personal ID numbers, names, addresses and AI profile images. GDPR-safe synthetic data for development and testing.

Create QR codes online for WiFi, URLs, contacts and calendar events. Download as PNG, SVG or PDF.

Image Converter

Convert images between WEBP, PNG and JPEG. Upload files or enter URL.

Mackan.eu collects free online tools for developers, engineers and IT professionals. All tools run directly in the browser without sending data to any server. Choose from coordinate conversion between WGS84, SWEREF99 TM and RT90, QR code creation for WiFi, contacts and events, high-entropy password generation, and generation of realistic Swedish test identities for GDPR-safe synthetic test data. For technical documentation and analysis there is a JSON Toolbox with support for CSV, XML and YAML conversion, as well as a backup power calculator. Need a free url shortener? Create short links with built-in QR code and no account required. All tools require no login, are ad-free and work offline.

Image Converter

Convert images between WEBP, PNG and JPEG. Upload files or enter URL.

Complete JSON toolkit: convert CSV/XML/YAML, format, validate, repair, compare and transform. 100% local processing.

Generate Password

Create strong, secure passwords and passphrases. Works offline and all data stays in your browser.

Create QR codes online for WiFi, URLs, contacts and calendar events. Download as PNG, SVG or PDF.

Test Phone Numbers Swedish only

Generate test numbers for mobile and landline from PTS reserved number series. Export to CSV and JSON.

Test Data Generator

Generate realistic Swedish test identities with personal ID numbers, names, addresses and AI profile images. GDPR-safe synthetic data for development and testing.

Convert Coordinates

Convert coordinates between WGS84 (GPS), SWEREF99 TM and RT90. Batch import, map view and address lookup.

Addy Swedish only

Create AnonAddy forwarding addresses in seconds.

Shorten URL Swedish only

Shorten URLs without registration. Create short links with built-in QR code for SMS and social media.

Share secret messages via secure one-time link that self-destructs after reading.

Live dashboard of cyber attacks against industrial control systems. Shows attacks, actor patterns and CVE correlations in real time.

Aptus Swedish only

Convert Aptus HEX keys to decimal values and export results.

Swedish Company Registry

Search 3 million Swedish companies by name, address or registration number. Batch export, map view and registration trends.

Flow Builder Swedish only

Create professional flowcharts with drag-and-drop directly in the browser.

Sweden Police Events Swedish only

Tactical map based on Swedish Police events in real-time.

PTS Registry Swedish only

Search the Swedish Post and Telecom Authority registry and export results.

Upcoming Events Swedish only

See upcoming events at Globe area: Avicii Arena, Hovet, 3Arena and Annexet.

Backup Power Calculator Swedish only

Calculate backup power, fuel consumption and test schedules with RKA profiles.

Text to Speech Swedish only

Convert text to natural speech in multiple languages directly in the browser.

Timer & Clock Swedish only

Digital clock and timer with various themes and presentation modes.