Petr Novak

Smart Convert – Currency & Unit Conversion is not just another calculator, it is a complete conversion infrastructure for WordPress sites. Designed for performance and flexibility, it handles everything from simple currency exchanges to complex, non-linear physical unit conversions (like Temperature).
Whether you run a travel blog, or a technical documentation hub, this plugin ensures your visitors see accurate conversions in a format that fits your design.
🚀 My Ambition: Premium Features for Free With this initial release, my goal is to set a new standard for what a free plugin can offer. I believe advanced tools shouldn’t be locked behind a paywall. That is why Smart Convert includes enterprise-grade features usually found only in paid versions: a Custom Unit Builder, a Template Engine, Import/Export capabilities, and Automatic Geolocation—all completely free.
<h3>🌟 Key Features</h3>
💰 Advanced Currency Engine 
* Rates: Supports 153 global currencies + cryptocurrencies (BTC, ETH, etc.). 
* Smart Geo-Location: Automatically detects visitor IP to display their local currency (powered by ipinfo.io). 
* “Spread” & Fees: Add a percentage markup (e.g., 2%) to exchange rates to simulate bank fees or retail pricing. 
* Smart Rounding: Intelligently adjusts decimals (e.g., 0 decimals for JPY, 6 decimals for BTC).
📏 Comprehensive Unit Converter 
* 105+ Built-in Units: Covers 14 categories including Length, Mass, Volume, Temperature, Pressure, Energy, Speed, and Data. 
* Bi-Directional Custom Units: Creating a unit like “Box” (e.g., 1 Box = 12 Items). The plugin automatically generates the reverse conversion logic for you. 
* Complex Math: Handles non-linear conversions (like Fahrenheit to Celsius) with precision offset calculations.
🎨 Visual & Editor Integration 
* Native Gutenberg Block: Visually configure conversions (Amount, From, To, Decimals) with a live backend preview. 
* Inline Toolbar Tool: Select any text in your post and convert it instantly using the rich text toolbar button. 
* Interactive Tooltips: Solves the common “overflow:hidden” clipping issue using a smart portal strategy to display rates on hover. 
* Template System: Design your output using placeholders like <code>{FROM}</code>, <code>{TO}</code>, <code>{RATE}</code>, and <code>{DATE}</code>.
⚙️ Performance & Workflow 
* Zero Database Bloat: Uses robust Object Caching and Transients. 
* Import/Export: Transfer your custom templates and custom units between sites via JSON. 
* Privacy First: External connections are disabled by default until explicit consent is given via the Onboarding Wizard.
<h3>🌍 Internationalization & Translations</h3>
Smart Convert – Currency & Unit Conversion is fully localized and ready for global audiences. The plugin is translated into the following languages:
<ul>
<li>English</li>
<li>Spanish (Español)</li>
<li>Japanese (日本語)</li>
<li>German (Deutsch)</li>
<li>French (Français)</li>
<li>Russian (Русский)</li>
<li>Brazilian Portuguese (Português do Brasil)</li>
<li>Italian (Italiano)</li>
<li>Czech (Čeština)</li>
<li>Dutch (Nederlands)</li>
<li>Turkish (Türkçe)</li>
<li>Polish (Polski)</li>
<li>Indonesian (Bahasa Indonesia)</li>
</ul>
<h3>⚖️ Privacy & External Services Disclosure</h3>
To provide up-to-date exchange rates and geolocation features, this plugin may connect to selected third-party services. 
No data is sent without your explicit consent via the settings page.
<ol>
<li>
Currency & Unit Data (Google Sheets via Proxy)
<ul>
<li>Service: Downloads conversion rates from public datasets.</li>
<li>Mechanism: Requests are routed through a static redirect wrapper on <code>petrnovak.cz</code> to ensure link stability.</li>
<li>Data Sent: Your server’s IP address (standard HTTP request). No visitor data is sent.</li>
<li>Policy: <a href="https://policies.google.com/privacy" rel="nofollow ugc">Google Privacy Policy</a></li>
<li>Proxy Policy: <a href="https://petrnovak.cz/plugins/smart-convert-currency-unit-conversion/privacy-policy.php" rel="nofollow ugc">PetrNovak.cz Privacy Policy</a></li>
</ul>
</li>
<li>
Geolocation (IPinfo.io)
<ul>
<li>Service: Used only if “Auto-detect currency from IP” is enabled in settings.</li>
<li>Mechanism: Sends the visitor’s IP address to IPinfo.io to determine their country code (e.g., “US”).</li>
<li>Data Sent: Visitor IP Address.</li>
<li>Policy: <a href="https://ipinfo.io/privacy" rel="nofollow ugc">IPinfo Privacy Policy</a></li>
</ul>
</li>
</ol>

Smart Convert – Currency & Unit Conversion

The ultimate conversion engine: 153 Currencies, 105+ Units, Custom Unit Builder, GeoIP detection, and a native Gutenberg Block with live previews.

Performance Lab vs Smart Convert – Currency & Unit Conversion