Ruwan Suraweera

Ruwan Mangala Suraweera is a dedicated ICT Educator and web developer based in Sri Lanka, actively teaching and creating educational tech solutions since 2008. He holds a BSc in Physical Science from the University of Kelaniya. Ruwan is the founder of PrimeToolHub.com, where he engineers 100% free, secure, and offline client-side web utilities that protect user privacy. Recognizing the educational challenges during the COVID-19 pandemic, he also developed schoolict.net to provide free self-study resources and digital management tools, such as the Offline School Bell System, to empower students and teachers across the country.

📂 Ruwan Suraweera ARTICLES

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AUG 9,
2026

(UPDATED:
AUG 9,
2026)

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DATA CONVERTERS ARTICLE

How to Convert CSV to SQL: Types, Dialects & Safe INSERT Statementshow-to-convert-csv-to-sql

How to Convert CSV to SQL A CSV is just rows of text;...

How to Convert CSV to SQL: Types, Dialects & Safe INSERT Statementshow-to-convert-csv-to-sql

August 9, 2026 by Ruwan Suraweera

How to Convert CSV to SQL A CSV is just rows of text; a SQL table is structured, typed data. Turning one into the other is a routine task, but doing it well means understanding a few things the automatic tools handle quietly: how columns become types, why the same query looks different across databases, … Read more

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AUG 9,
2026

(UPDATED:
AUG 9,
2026)

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DOCUMENT TOOL ARTICLE

How PDF Files Work Inside – Text, Pages and Why Redaction Is Hard

How PDF Files Work Inside A plain explanation of what is actually stored...

How PDF Files Work Inside – Text, Pages and Why Redaction Is Hard

August 9, 2026 by Ruwan Suraweera

How PDF Files Work Inside A plain explanation of what is actually stored inside a PDF, why copied text comes out jumbled, why a black box does not delete anything, and what the file quietly reveals about you Last Updated: August 2026 🟢 A PDF Is Not a Document, It Is a Set of Drawing … Read more

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AUG 9,
2026

(UPDATED:
AUG 9,
2026)

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TEXT & SEO TOOLS ARTICLE

How to Spot AI Written Content — And Why Detector Tools Keep Getting It Wrong

How to Spot AI Written Content Why generated prose has a recognisable rhythm,...

How to Spot AI Written Content — And Why Detector Tools Keep Getting It Wrong

August 9, 2026 by Ruwan Suraweera

How to Spot AI Written Content Why generated prose has a recognisable rhythm, what perplexity and burstiness actually measure, why detectors fail, and what search guidance really says. Last Updated: August 2026 🔴 Why Generated Prose Has a Shape A language model does one thing repeatedly: given everything written so far, it produces a probability … Read more

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AUG 9,
2026

(UPDATED:
AUG 9,
2026)

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AI ASSISTANT ARTICLE

How Sentiment Analysis Works — And Why “Not Bad” Is So Hard

How Sentiment Analysis Worksl Why counting positive words fails, how negation and word...

How Sentiment Analysis Works — And Why “Not Bad” Is So Hard

August 9, 2026 by Ruwan Suraweera

How Sentiment Analysis Worksl Why counting positive words fails, how negation and word order break simple models, and what a neural model does differently. Written for people reading real feedback. Last Updated: August 2026 🔴 Turning Words Into a Number Every approach to this problem, from the simplest to the most expensive, is doing the … Read more

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AUG 7,
2026

(UPDATED:
AUG 9,
2026)

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WEB DEVELOPMENT ARTICLE

How Product Tours Work Under the Hood

Spotlights, Selectors and Why Most Get Skipped The box-shadow trick behind every spotlight...

How Product Tours Work Under the Hood

August 9, 2026August 7, 2026 by Ruwan Suraweera

Spotlights, Selectors and Why Most Get Skipped The box-shadow trick behind every spotlight overlay, why selectors break silently, and what onboarding research says about the tours people actually finish. Last Updated: August 2026 🔴 Locating an Element on a Live Page Before anything can be highlighted, the tour has to know where the target is. … Read more

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JUL 17,
2026

(UPDATED:
JUL 17,
2026)

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AI ASSISTANT ARTICLE

How Browser AI Code Tools Work — BYOK, Direct API Calls & the Privacy Trade

How Browser-Based AI Code Tools Really Work What happens when you paste an...

How Browser AI Code Tools Work — BYOK, Direct API Calls & the Privacy Trade

July 17, 2026 by Ruwan Suraweera

How Browser-Based AI Code Tools Really Work What happens when you paste an API key into a web page and ask it to write code — the direct-to-provider request, why bring-your-own-key changes who sees your data, and the honest limits of “runs in your browser”. Last updated: July 2026 🔴 Two Ways to Build an AI … Read more

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JUL 13,
2026

(UPDATED:
JUL 13,
2026)

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AI ASSISTANT ARTICLE

How AI Image & Video Prompts Actually Work: Diffusion, Tokens, Seeds & Negatives

Why Your Words Change the Picture An image model does not draw. It...

How AI Image & Video Prompts Actually Work: Diffusion, Tokens, Seeds & Negatives

July 13, 2026 by Ruwan Suraweera

Why Your Words Change the Picture An image model does not draw. It removes noise, thousands of times, and your prompt is the instruction that steers every one of those steps. Understand that loop and prompt engineering stops being superstition and starts being a craft. Last updated: July 2026 🔴 Diffusion: sculpting a picture out of … Read more

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JUL 13,
2026

(UPDATED:
JUL 15,
2026)

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DIGITAL ELECTRONICS ARTICLE

Boolean Minimization Explained: Quine–McCluskey, Prime Implicants & Gate Cost

Why Simplifying Boolean Logic Saves Real Silicon Every product term you remove is...

Boolean Minimization Explained: Quine–McCluskey, Prime Implicants & Gate Cost

July 15, 2026July 13, 2026 by Ruwan Suraweera

Why Simplifying Boolean Logic Saves Real Silicon Every product term you remove is a gate you do not build. Here is how minimization actually works — from truth table to minterms, through the Quine–McCluskey algorithm to prime implicants, and out the other side as a cheaper, faster circuit. Last updated: July 2026 🔴 What minimization is … Read more

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JUL 13,
2026

(UPDATED:
JUL 13,
2026)

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WEB DEVELOPMENT ARTICLE

How Responsive Web Design Works: Viewports, Breakpoints & Fluid Layouts

Why One Page Fits Every Screen A single HTML page can look right...

How Responsive Web Design Works: Viewports, Breakpoints & Fluid Layouts

July 13, 2026 by Ruwan Suraweera

Why One Page Fits Every Screen A single HTML page can look right on a 390px phone and a 2560px monitor because of a small set of ideas working together: one meta tag, a unit system built on CSS pixels, breakpoints, and fluid sizing. How Responsive Web Design each piece works and how they fit … Read more

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JUL 10,
2026

(UPDATED:
JUL 10,
2026)

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DEVELOPER TOOLS ARTICLE

How Browser AI Models Actually Work: WebGPU, WASM & On-Device Privacy

How AI Runs Inside a Browser Tab, Without a Server WebGPU, WebAssembly, and...

How Browser AI Models Actually Work: WebGPU, WASM & On-Device Privacy

July 10, 2026 by Ruwan Suraweera

How AI Runs Inside a Browser Tab, Without a Server WebGPU, WebAssembly, and clever compression now let real models run on your own machine with nothing sent to the cloud. Here is what is actually happening under the hood, and what it means for speed, privacy, and when you should reach for it. Last updated: … Read more

📂 Ruwan Suraweera ARTICLES

How to Convert CSV to SQL: Types, Dialects & Safe INSERT Statementshow-to-convert-csv-to-sql

How PDF Files Work Inside – Text, Pages and Why Redaction Is Hard

How to Spot AI Written Content — And Why Detector Tools Keep Getting It Wrong

How Sentiment Analysis Works — And Why “Not Bad” Is So Hard

How Product Tours Work Under the Hood

How Browser AI Code Tools Work — BYOK, Direct API Calls & the Privacy Trade

How AI Image & Video Prompts Actually Work: Diffusion, Tokens, Seeds & Negatives

Boolean Minimization Explained: Quine–McCluskey, Prime Implicants & Gate Cost

How Responsive Web Design Works: Viewports, Breakpoints & Fluid Layouts

How Browser AI Models Actually Work: WebGPU, WASM & On-Device Privacy

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