Free Online Tools
Free online calculators and tools for electronics engineers, hobbyists, and professionals. **100% privacy-first, browser-only processing** - no signup required, no watermarks, no ads, no tracking. All tools process data entirely in your browser—your data never leaves your device.
Automation Tooling (n8n / Make / Zapier)
Set up and manage automation workflows with n8n, Make, or Zapier. Get your automation stack configured with governance and best practices.
n8n Setup & Governance
Self-hosted or cloud automation with full control. Perfect for teams that need custom logic and data sovereignty.
- • Self-host or cloud options
- • Custom logic support
- • Full control over data
- • Open source
Make Setup & Orchestration
Enterprise-grade automation with GDPR compliance and SOC 2 Type II certification. Ideal for complex workflows.
- • GDPR compliant
- • SOC 2 Type II
- • Advanced orchestration
- • Enterprise security
Zapier Setup & Integration
Fast SaaS automation with 8,000+ app integrations. Perfect for quick wins and common integrations.
- • 8,000+ app integrations
- • Fast setup
- • User-friendly interface
- • Extensive app library
Automation Tools
Calculators and wizards to help you plan your automation projects.
Automation ROI Calculator
Calculate the return on investment for automating your workflows.
Use Tool →Zapier/Make Cost Estimator
Estimate monthly costs for Zapier or Make based on your workflow volume.
Use Tool →Tool Picker Wizard
Find out which automation tool (n8n, Make, or Zapier) is best for your needs.
Use Tool →E-Rechnung Readiness Check
Quick check to see if your business is ready for E-Rechnung compliance in Germany.
Use Tool →Tool Categories
Electronics Tools
Free online calculators and tools for electronics engineers and hobbyists. Resistor calculators, LED calculators, and more.
View All Tools →🧮Rechner (German Tools)
Nützliche Online-Rechner für Freelancer und Unternehmer.
View All Tools →🛠️General Tools
Free online tools for daily tasks: work time tracking, PDF editing, text tools, calculators, and more. All processing happens in your browser.
View All Tools →🎬Media Editors
Free browser-based video, audio, and image editors. All processing happens in your browser - files never leave your device.
View All Tools →💻Developer Tools
Free online developer tools for encoding, decoding, formatting, validating, and generating data. All processing happens in your browser - privacy-first, no signup required.
View All Tools →🔒Security Tools
Free online security tools for generating secure passwords and managing credentials. All generation happens in your browser.
View All Tools →🎲Generator Tools
Free online generators for QR codes and more. Create custom codes and data formats with no sign-up required.
View All Tools →All Tools
⚡Electronics Tools
Free online calculators and tools for electronics engineers and hobbyists. Resistor calculators, LED calculators, and more.
Resistor Color Code Calculator
Calculate resistor values from color bands or find the color code for a given resistance value. Supports 4-band, 5-band, and 6-band resistors following IEC 60062 standard. Perfect for electronics engineers, hobbyists, and students working with through-hole resistors.
Use Tool →LED Resistor Calculator
Calculate the correct resistor value for LEDs based on supply voltage and LED specifications. Supports single LEDs, series, and parallel configurations. Essential for Arduino, Raspberry Pi, ESP32, and electronics projects. Includes power dissipation warnings and standard E24 resistor suggestions.
Use Tool →Ohm's Law Calculator
Calculate voltage, current, resistance, or power using Ohm's Law. Enter any two values to find the others. Essential tool for electronics engineers, students, and hobbyists working with electrical circuits. Understand the fundamental relationship between voltage (V), current (I), resistance (R), and power (P) in DC circuits.
Use Tool →🧮Rechner (German Tools)
Nützliche Online-Rechner für Freelancer und Unternehmer.
Freelancer Tax Calculator
Calculate your estimated income tax as a freelancer in Germany (2025).
Use Tool →Small Business Status Check
Check if you can use the small business regulation (§19 UStG) and are exempt from sales tax.
Use Tool →🛠️General Tools
Free online tools for daily tasks: work time tracking, PDF editing, text tools, calculators, and more. All processing happens in your browser.
Work Time Tracking
Track your work hours with German-compliant time tracking. Export to PDF for compliance documentation.
Use Tool →IBAN Validator & BIC Finder
Validate IBAN numbers and find associated BIC codes. Supports German banks with bank name identification.
Use Tool →Meeting Cost Calculator
Calculate the real cost of meetings based on participant salaries and meeting duration.
Use Tool →OCR Text Extraction
Extract text from images using browser-based OCR. No uploads, all processing happens locally.
Use Tool →PDF Merge & Split
Merge multiple PDFs or split a PDF into individual pages. All processing happens client-side.
Use Tool →Commuter Allowance Calculator
Calculate your commuter allowance (Pendlerpauschale) for tax purposes in Germany.
Use Tool →Travel Expense Calculator
Calculate travel expenses and mileage allowances for business trips in Germany.
Use Tool →Text Tools Suite
Lorem Ipsum generator, word counter, case converter, and slug generator. All in one tool.
Use Tool →Typing Speed Test
Test your typing speed and accuracy with WPM and CPM calculations. Practice with different texts.
Use Tool →🎬Media Editors
Free browser-based video, audio, and image editors. All processing happens in your browser - files never leave your device.
Video Editor
Trim, convert, compress, and edit videos directly in your browser. Supports MP4, WebM, GIF conversion. All processing happens locally using FFmpeg.wasm—your videos never leave your device. Perfect for quick edits, format conversion, and compression without installing software or uploading files to servers.
Use Tool →Audio Editor
Trim, convert, normalize, and edit audio files. Supports MP3, WAV, OGG, AAC, FLAC formats with waveform visualization. All processing happens in your browser using FFmpeg.wasm—your audio files never leave your device. Perfect for podcast editing, music preparation, and audio optimization.
Use Tool →Image Editor
Crop, resize, convert, compress, and edit images. Supports PNG, JPG, WebP, SVG with filters and adjustments. All image processing happens in your browser—no uploads, no server processing, complete privacy. Perfect for quick edits, format conversion, optimization for web use, and basic photo adjustments without installing software.
Use Tool →Aspect Ratio Calculator
Calculate dimensions, resize images while maintaining aspect ratio. Common presets for social media, video, and print.
Use Tool →💻Developer Tools
Free online developer tools for encoding, decoding, formatting, validating, and generating data. All processing happens in your browser - privacy-first, no signup required.
Base64 Encoder / Decoder
Encode text or files to Base64, or decode Base64 back to its original form. Supports URL-safe Base64 and data URLs. Essential tool for developers working with APIs, data transmission, and embedding binary data in text formats. All processing happens in your browser for complete privacy.
Use Tool →JSON Formatter & Validator
Format, validate, minify, and explore JSON data. Interactive tree view with syntax highlighting and error detection. Essential tool for developers working with APIs, configuration files, and data processing. All processing happens in your browser for privacy and speed.
Use Tool →Cron Expression Generator
Build and understand cron expressions visually. Schedule tasks with human-readable explanations and next execution preview. Essential tool for developers, system administrators, and DevOps engineers working with scheduled tasks, automated jobs, and periodic maintenance. Perfect for Linux, macOS, and cloud platforms that use cron syntax.
Use Tool →Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes for text or files. Verify hash integrity and compare hashes.
Use Tool →Markdown Editor
Write and preview Markdown in real-time with live rendering. Includes formatting toolbar, templates, and export to HTML.
Use Tool →Regex Tester & Builder
Test and debug regular expressions in real-time with match highlighting and pattern explanations. Includes common pattern library.
Use Tool →Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates. Supports seconds and milliseconds with multiple date formats.
Use Tool →UUID / GUID Generator
Generate universally unique identifiers instantly. Supports UUID v4, v1-like, and various output formats with bulk generation. Essential for developers working with databases, APIs, distributed systems, and unique identifier requirements. All generation happens in your browser using cryptographically secure randomness.
Use Tool →Chmod Calculator
Calculate Unix/Linux file permissions. Convert between numeric (octal) and symbolic notation.
Use Tool →CSS Generator Suite
Generate CSS for Box Shadow, Border Radius, Flexbox, and Grid. Visual editors with live preview.
Use Tool →JWT Decoder
Decode and analyze JWT tokens entirely client-side. Validate token structure and check expiration status.
Use Tool →Open Graph Preview
Preview how your page will look when shared on social media. Generate and validate OG meta tags.
Use Tool →URL & HTML Encoder
Encode and decode URLs, HTML entities, and more. All processing happens client-side.
Use Tool →🔒Security Tools
Free online security tools for generating secure passwords and managing credentials. All generation happens in your browser.
Secure Password Generator
Generate strong, random passwords using cryptographically secure randomness. Includes strength meter and entropy calculation. Create secure passwords for accounts, API keys, tokens, and sensitive data. All generation happens in your browser—no passwords are ever sent to servers.
Use Tool →Legal Compliance Suite
Generate legally required documents for German websites: Impressum, Privacy Policy, AVV/DPA, and Cookie Banner Code.
Use Tool →🎲Generator Tools
Free online generators for QR codes and more. Create custom codes and data formats with no sign-up required.
QR Code Generator
Create custom QR codes for URLs, WiFi networks, contact cards, email, SMS, and locations. Customize colors and size.
Use Tool →E-Rechnung Generator
Generate XRechnung (XML) and ZUGFeRD (PDF/A-3 with embedded XML) compliant invoices. All processing happens client-side.
Use Tool →Invoice Generator
Create professional invoices with German/EU compliance. Export as downloadable PDF-ready HTML.
Use Tool →Privacy-First, Free, No Signup Required
All tools on this page are **100% free, privacy-first, and browser-only**. This means:
- 🔒 Privacy-First: Your data never leaves your device—no server round-trips, no data collection
- ⚡ Instant Results: All processing happens in your browser—no network latency
- 🆓 100% Free: No hidden costs, no premium features, completely free
- 🚫 No Signup Required: Use all tools instantly without creating an account
- ✨ No Watermarks: Clean output without any branding or watermarks
- 📴 Works Offline: Tools function even without an internet connection (after first load)
- 🚫 No Ads or Tracking: Completely ad-free experience with zero tracking
- 🔐 Secure: Uses Web Crypto API and modern browser security features
**Perfect for:** Developers, engineers, students, hobbyists, and anyone who values privacy and wants free, high-quality tools without the hassle of signups or watermarks.