Forem: Emir Baycan

We Built an Advanced QR & Barcode Toolkit for the Web

Emir Baycan — Wed, 11 Mar 2026 15:42:39 +0000

QR Code Generator

The generator supports many different data types.

You can create QR codes for:

text
URLs
email
phone numbers
SMS
WiFi credentials
contact cards
locations
calendar events

It also supports social links such as:

WhatsApp
Twitter
Instagram
Facebook
YouTube

And payment formats including:

PayPal
Bitcoin
Ethereum

Deep QR Customization

Instead of generating plain black-and-white QR codes, the generator allows extensive visual customization.

Dot Styles

QR modules can be rendered using different shapes such as:

square
dots
rounded
diamond
pentagon
hexagon
star
heart
triangle
leaf
gear
crescent

Eye Frame Styles

The finder patterns (corner squares) can be customized with styles like:

square
circle
rounded
directional frames
corner-only styles
cut styles

Eye Ball Styles

The center eye elements can be customized independently with shapes including:

square
circle
rounded
directional cuts
diagonal shapes
heart style

Size & Error Correction

QR codes can be generated in multiple sizes:

250px
300px
400px
500px

Error correction levels are configurable:

Low (7%)
Medium (15%)
Quality (25%)
High (30%)

Higher error correction allows QR codes to remain scannable even if partially damaged or partially covered.

Color Customization

You can customize:

QR foreground color
background color
gradient effects
custom eye colors

This allows the QR code to match a brand or design system.

Advanced Rendering Options

Additional styling options include:

rotation
liquid radius
dot spacing
piece stroke
gradient rendering

These options allow creating unique QR designs while maintaining scan reliability.

Logo Embedding

You can embed a logo in the center of the QR code.

Because of QR error correction, the code can still be scanned even when part of it is covered by the logo.

Built-in QR Scanner

The platform also includes scanning capabilities.

You can scan codes using:

your device camera
uploaded images
screenshots

The scanner detects both QR codes and traditional barcodes.

Barcode Generator

In addition to QR codes, the platform supports generating traditional barcodes used in:

retail
logistics
inventory systems
warehouses

Try It

You can try the platform here:

🔗 https://qr-bar-code.com/

You can:

generate QR codes
generate barcodes
scan QR codes using your camera
decode QR codes from images

All directly in your browser.

We Built a Scientifically Designed Online IQ Test (and Explained the Methodology Behind It)

Emir Baycan — Wed, 11 Mar 2026 15:36:48 +0000

Over the past months we built a project called:

https://whats-your-iq.com/

Most online IQ tests are either entertainment quizzes or opaque scoring systems where you answer some questions and receive a number without understanding how it was calculated.

So instead of building another quiz, we focused on building something different:

A transparent intelligence assessment platform where the methodology is fully documented.

You can read the full methodology here:

https://whats-your-iq.com/en/our-iq-test-methodology

The Problem With Most Online IQ Tests

Most online tests use extremely simple scoring models.

Typical approach:

count correct answers
divide by total questions
convert to a number that looks like an IQ score

The issue is that real cognitive assessments do not work this way.

Professional psychometric tests account for:

question difficulty
guessing probability
measurement error
reliability
response validity

Without these elements, the score has little statistical meaning.

Our Approach

Instead of simple raw scoring, the system uses modern psychometric measurement methods.

The methodology includes:

Item Response Theory (IRT 3PL)
reliability estimation
measurement error modeling
response validity checks
confidence interval reporting

These frameworks are commonly used in standardized assessments.

Item Response Theory (IRT)

Instead of counting correct answers, the system estimates cognitive ability using Item Response Theory.

IRT models the probability that a person with a certain ability level will answer each question correctly.

Each item includes parameters such as:

difficulty
discrimination
guessing probability

The final ability estimate is calculated using Maximum A Posteriori (MAP) estimation based on the full response pattern.

Reliability of the Test

Reliability is estimated using Cronbach's Alpha.

Current estimate:

α ≈ 0.94

Values above 0.90 indicate very high internal consistency.

Calibrated Question Bank

The test is built on a calibrated item bank using Item Response Theory (IRT).

Current dataset:

73 psychometrically calibrated questions
10,000+ cleaned response samples used for parameter estimation

Responses used for calibration go through a data quality pipeline before being included in the dataset.

The cleaning process removes noisy or invalid responses such as:

extremely fast responses indicating random answering
inconsistent response patterns
incomplete test sessions
duplicate or automated submissions

After filtering the dataset, the remaining responses are used to estimate item parameters including:

difficulty
discrimination
guessing probability

As the dataset grows, the item parameters and score norms are recalibrated using the updated response pool, improving the stability and accuracy of the ability estimates.

This continuous calibration process allows the test to become more reliable as more valid responses are collected.

Validity Checks

The system also includes response validity indicators.

Examples include:

person-fit analysis
response pattern detection
rapid guessing detection
response speed analysis

These checks help detect invalid response behavior.

Cognitive Domains Measured

The assessment evaluates multiple areas of reasoning.

These include:

logical reasoning
spatial intelligence
verbal comprehension
working memory
processing speed
quantitative reasoning
pattern recognition
creative reasoning

Score Interpretation

Scores follow the standard IQ distribution model:

Mean = 100
Standard deviation = 15

Percentiles are estimated using this theoretical distribution.

Important Transparency Note

The test follows modern psychometric principles but it is not a clinical psychological assessment.

It does not replace professionally administered tests such as:

WAIS
Stanford-Binet

Those require administration by licensed psychologists.

Why We Published the Full Methodology

Most online IQ tests hide their scoring methods.

We chose to publish ours openly so users can understand:

how the score is calculated
what the test measures
what the limitations are

Full methodology:

https://whats-your-iq.com/en/our-iq-test-methodology

Try the Test

If you're curious about the system, you can try it here:

https://whats-your-iq.com/

I built 75+ free browser tools

Emir Baycan — Wed, 11 Mar 2026 15:23:04 +0000

I've been building websites and providing online technical support for more than 10 years. During that time I kept running into the same small problems again and again.

Things like converting files, compressing images, trimming media, formatting JSON, generating UUIDs, or quickly calculating something.

The tools exist, but they're scattered across dozens of different websites. Many require uploads, accounts, or have annoying limits.

So I started building my own collection of tools that solve these small tasks quickly and run entirely in the browser:

convert files
compress media
manipulate images
use developer utilities
run quick calculators
process text or network data

So I built this:

https://file-converter-free.com/

All tools run entirely inside the browser.

No uploads to servers
No accounts required
No limits
No watermarks

Your files stay on your device and disappear when the tab is closed.

File Converters

Convert many file types directly in your browser.

Image Converter — Convert images between formats such as PNG, JPG, WebP and more.
Video Converter — Convert video files into different formats.
Audio Converter — Convert audio files between formats.
Document Converter — Convert document files into different formats.
Presentation Converter — Convert presentation formats.
Ebook Converter — Convert ebook formats for different readers.
Archive Converter — Convert archive formats.
Font Converter — Convert font files between formats.

File Compressors

Reduce file sizes for easier storage and sharing.

Image Compressor — Compress images while maintaining quality.
Video Compressor — Reduce video file size.
Audio Compressor — Compress audio files.
Document Compressor — Reduce document file size.
Presentation Compressor — Compress presentation files.
Ebook Compressor — Reduce ebook size.
Archive Compressor — Create compressed archives.
Font Compressor — Reduce font file size.

Image Tools

Browser-based tools for editing and analyzing images.

Image Color Picker — Extract color values from images.
Image Editor — Adjust brightness, contrast and filters.
Image Resizer — Resize images to exact dimensions.
Image Crop — Crop images to custom areas.
Image Rotate & Flip — Rotate or flip images.
Image Watermark — Add text or logo watermarks.
Background Remover — Remove image backgrounds automatically.
Image to Base64 — Convert images into Base64 strings.
Image to PDF — Convert images into a PDF document.
Image Meta Editor — View or remove EXIF metadata.
Image Aspect Ratio Calculator — Maintain correct image proportions.
Favicon Generator — Generate favicon icon sizes.

PDF Tools

PDF Merge — Combine multiple PDF files into one.
PDF Split — Split PDFs by page ranges.

Media Tools

Video Clipper — Trim video files directly in the browser.
Audio Clipper — Trim audio files.

Developer Tools

JSON Formatter — Format JSON for readability.
JSON Validator — Validate JSON syntax.
JSON Tree Viewer — Explore JSON structures visually.
JWT Decoder — Decode JSON Web Tokens.
JWT Generator — Generate signed JWT tokens.
Base64 Encoder / Decoder — Encode or decode Base64 text.
URL Encoder / Decoder — Encode or decode URLs.
URL Parser — Analyze URL structure.
Hash Generator — Generate MD5, SHA-1, SHA-256 and SHA-512 hashes.
UUID Generator — Generate UUID v4 identifiers.
Regex Tester — Test regular expressions.
HTML Minifier — Minify HTML.
CSS Minifier — Compress CSS.
JS Minifier — Minify JavaScript.
CSV Visualizer — Display CSV data as tables.

Calculator & Date Tools

Percentage Calculator — Calculate percentages and ratios.
Age Calculator — Calculate exact age from birth date.
Date Difference Calculator — Find the difference between two dates.
Time Duration Calculator — Add or subtract time durations.
Data Transfer Calculator — Estimate file transfer time.
Unit Converter — Convert between measurement units.
Timestamp Converter — Convert Unix timestamps to readable dates.
Weekday Finder — Find which day of the week a date falls on.
Loan Calculator — Calculate loan payments and interest.
Mortgage Calculator — Estimate mortgage payments.
Interest Calculator — Calculate simple or compound interest.
VAT Calculator — Add or remove VAT from prices.
Discount Calculator — Calculate prices after discounts.
BMI Calculator — Calculate body mass index.
Pregnancy Calculator — Estimate due dates and pregnancy stages.
Calorie Calculator — Estimate daily calorie needs.
Speed Calculator — Calculate speed, distance or time.
Electricity Cost Calculator — Estimate electricity cost of appliances.

Text Tools

Word Counter — Count words, characters and reading time.
HTML Encoder / Decoder — Encode or decode HTML entities.
Unicode Encoder / Decoder — Convert text to or from Unicode.
Duplicate Word Finder — Detect repeated words.
Remove Duplicate Lines — Remove repeated lines from text.
Lorem Ipsum Generator — Generate placeholder text.
Typing Speed Tester — Measure typing speed and accuracy.
Text Case Converter — Convert text between case styles.

General Tools

Password Generator — Generate secure random passwords.
QR Code Generator — Create QR codes from text or URLs.
Random Name Generator — Generate random names for testing.
IP Checker — Show your public IP and network info.
Browser Checker — Detect browser and device information.
Font Picker — Browse Google Fonts and generate CSS.
Random Number Generator — Generate numbers within a range.
Random Color Generator — Generate HEX, RGB or HSL colors.
Dice Roller — Simulate dice rolls.
Coin Flip — Flip a virtual coin.
Markdown Editor — Write and preview Markdown.
Random Address Generator — Generate realistic addresses for testing.

Looking for more tool ideas

If there is a tool you often search for online but struggle to find, hitting to subscription or limits, let me know. I will add it to the website as soon as possible as free.

🚀 How I Built a Bridge Between VS Code and My Phone — VSCoder Copilot

Emir Baycan — Tue, 07 Oct 2025 13:03:38 +0000

Ever wished you could review pull requests or fix bugs from your phone without SSH or remote desktop?
I had that same problem — so I built a bridge that connects GitHub Copilot on your desktop to your mobile device, securely and instantly.

🧠 The Idea

Developers often work on the go — but tools like VS Code and GitHub Copilot are tied to the desktop.
My goal was simple:

Make Copilot available anywhere — without sacrificing privacy or setup simplicity.

That’s how VSCoder Copilot was born: a mobile companion app that lets you chat with AI, review code, and make quick fixes right from your phone.

⚙️ How It Works

VS Code Extension runs a lightweight server on your desktop
Mobile App connects using a secure 6-digit pairing code
Both communicate via an encrypted Discovery API — no port forwarding or VPN required
AI responses are synced instantly between VS Code and your phone

Here’s the flow 👇

Phone → Secure Cloud → VS Code Extension
      ↕              ↕
   Real-time AI chat + file edits

🔒 Security First

End-to-end encryption
Temporary pairing codes that expire every 10 minutes
Device approval required before connection
All data stays between your devices — no cloud file storage

📱 Real-World Use Cases

Review PRs while commuting 🚆
Fix small bugs without opening a laptop ☕
Ask Copilot questions about your workspace while away 🧠
Keep coding even when traveling 🌍

🧩 Tech Stack

VS Code Extension: TypeScript
Mobile App: React Native + Expo + Firebase
Backend: Go + WebSocket Discovery API
AI Models: GitHub Copilot (GPT-4o, Claude 3.5, etc.)

🌟 Why I Built It

I wanted a seamless way to continue coding without context switching — to have my entire workspace available anywhere.
Instead of syncing files or using remote desktops, I created a bridge — lightweight, secure, and developer-friendly.

🧪 Try It Out

📦 VS Code Extension: VSCoder Copilot on Marketplace
📱 Mobile App: Google Play Store
🌐 Website: vscodercopilot.com.tr

💬 Feedback Welcome

I’d love to hear your thoughts —
What would make this more useful for you?
Offline sync? Team collaboration?
Drop a comment below or DM me — I read everything.

Tags: #vscode #ai #mobile #productivity