DEV Community: Lucas M M

How to Make a QR Code (Free, No Sign-Up)

Lucas M M — Mon, 27 Jul 2026 17:11:46 +0000

QR codes are everywhere now — on menus, business cards, flyers, product packaging, and event posters. They're just a fast way to send someone from the physical world to a digital one: point a phone camera, tap the notification, done. The best part is you can make your own in under a minute, for free, without installing anything.

What a QR code can hold

A QR code is really just an image that encodes a bit of data. The most common types:

A website URL — the classic "scan to visit."
Plain text — a message, a code, instructions.
Wi-Fi credentials — guests scan to join your network without typing the password.
Contact info (vCard) — scan to save your details straight into contacts.
Email or phone — scan to start a message or call.

For 95% of people, it's the URL type: you have a link, you want a code that opens it.

How to make one

Decide what the code should do (usually: open a link).
Paste your URL into a QR generator.
Download the image — PNG for screens, SVG if you'll print it large (SVG stays sharp at any size).
Test it with your own phone before you print or publish it.

That last step matters. Printing a thousand flyers with a broken code is a bad day. Always scan your own code first.

Tips for codes that actually scan

Keep good contrast. Dark code on a light background scans best. Low-contrast color combos can fail.
Don't shrink it too small. On print, aim for at least 2 x 2 cm; bigger if people scan from a distance.
Leave the quiet zone. That white margin around the code isn't wasted space — scanners need it.
Use a short URL when you can. Less data means a simpler, more reliable code.

Make one right now

I built a free generator that does exactly this — no account, no watermark, no upsell. Paste a URL (or text, or Wi-Fi details), and download a clean QR code instantly.

👉 QRHatch — free QR code generator

Great for a restaurant menu, a wedding, a "scan to review us" sign, or sharing your portfolio link at an event.

The bottom line

A QR code is a scannable shortcut to any link or bit of text. Paste your URL, download the image (PNG for screens, SVG for print), and — most importantly — test it on your own phone before it goes live. That's the whole process.

How to Make Fancy Text for Your Instagram, Discord, and TikTok Bio

Lucas M M — Mon, 27 Jul 2026 17:10:11 +0000

You've seen those profiles with fancy cursive names, bubble letters, or tiny superscript text and wondered how they did it — especially since most apps only let you type plain letters. The trick isn't a secret font or a paid app. It's Unicode, and anyone can use it in about five seconds.

Why it works: it's not a font, it's Unicode

Instagram, Discord, TikTok, and Twitter/X don't let you change fonts in your bio. So how do people get fancy letters? They're not really "fonts" at all — they're separate Unicode characters that happen to look like stylized letters.

Unicode is the giant international standard that defines every character your device can display, from emoji to math symbols to alphabets in every language. Buried in it are full alphabets of bold, italic, script, bubble, and upside-down letters. When you paste one of these into your bio, the app just sees normal characters — so it displays everywhere, no font support required.

The catch to know about

Because these are individual Unicode characters and not styled regular text:

They copy and paste anywhere — bios, usernames, comments, messages.
Screen readers may read them oddly, so don't put essential info (like a business name) only in fancy text. Use it for flair, not for your whole bio.
A few platforms filter certain ranges, so if one style doesn't stick, try another.

How to actually make it

You can't type these on a normal keyboard, so you use a generator: type your text once, and it instantly shows you every style — bold, italic, cursive/script, bubble, squared, tiny superscript, strikethrough, and more. Then you tap the one you like to copy it and paste it wherever you want.

👉 GlyphFont — free fancy font & glyph generator

No sign-up, works on mobile, and it's tap-to-copy — so you can style your Instagram name and Discord bio in seconds.

Ideas for using it

Make your Instagram display name stand out in search.
Give your Discord nickname or server channels a themed look.
Add a decorative divider between the lines of your TikTok bio.
Style a section header in a Notion page or forum post.

The bottom line

Fancy text isn't a font — it's Unicode characters that mimic styled letters, which is why they paste anywhere. Type your text into a generator, pick a style, copy, paste. Just keep the important stuff in normal letters for accessibility, and use the fancy styles to add personality.

How to Calculate Your Exact Age in Years, Months, and Days

Lucas M M — Mon, 27 Jul 2026 16:57:20 +0000

"How old am I?" sounds like a question with an obvious answer — until you need it exactly. Filling out a form, figuring out a baby's age in weeks, counting down to a milestone birthday, or working out how many days you've been alive: suddenly "I'm 34" isn't precise enough. Here's how to get the exact number, and why the math trips people up.

Why age math is sneakier than it looks

Calculating age isn't just "this year minus your birth year." Two things get in the way:

Whether your birthday has happened yet this year. If you were born in November and it's currently March, you're one year younger than a straight subtraction suggests.
Months have different lengths, and leap years exist. February throws everything off, and every four years an extra day sneaks in.

That's why doing it in your head — or even on a basic calculator — leads to off-by-one errors.

The manual method

To get your exact age:

Subtract the birth year from the current year.
If the current month/day is before your birthday this year, subtract 1.
For months and days, count forward from your last birthday to today.

Example: born June 20, 2016; today is July 27, 2026. You've had your 2026 birthday, so you're 10 years, 1 month, and 7 days old.

Fun ways to measure age

Once you're being precise, you can slice it however you like:

In days: great for "I've been alive for 14,600 days" trivia.
In weeks: how pediatricians track babies for the first few months.
In hours: a fun one for kids.
Until the next milestone: exactly how long until you turn 18, 30, 40, or 100.

You can also calculate the gap between any two dates — useful for anniversaries, work tenure, or how far apart two events were.

Do it instantly

Rather than count on your fingers through February, I built a free tool that does all of this at once. Enter your birth date (or any two dates) and it gives your exact age in years, months, weeks, days, and hours.

👉 AgeTally — free age calculator

No sign-up, works on your phone, and handles leap years so you don't have to.

The bottom line

Exact age = years since birth, minus one if your birthday hasn't come yet, plus the leftover months and days. It's easy to get wrong by hand because of birthdays, uneven months, and leap years — which is exactly why a quick calculator is worth bookmarking for the next form that asks.

How to Calculate Your TDEE (and Actually Use It to Lose or Gain Weight)

Lucas M M — Mon, 27 Jul 2026 16:33:22 +0000

If you've ever wondered "how many calories should I eat a day?", the honest answer is: it depends on your TDEE. Nail that number and everything else — fat loss, muscle gain, or just maintaining — becomes simple math instead of guesswork.

What TDEE actually means

TDEE stands for Total Daily Energy Expenditure — the total number of calories your body burns in a day. It's made up of four parts:

BMR (Basal Metabolic Rate): calories you'd burn lying in bed all day just keeping your organs running. Usually 60–70%.
TEF (Thermic Effect of Food): energy used to digest what you eat, about 10%.
NEAT: everything that isn't exercise — walking, fidgeting, doing dishes.
Exercise: your workouts.

Add those up and you get the calories you burn on a typical day. Eat that amount and your weight stays stable.

How to estimate it

Most calculators use the Mifflin-St Jeor equation to find your BMR, then multiply by an activity factor:

Sedentary (desk job, little exercise): BMR × 1.2
Lightly active (1–3 days/week): BMR × 1.375
Moderately active (3–5 days/week): BMR × 1.55
Very active (6–7 days/week): BMR × 1.725

You need four things: your age, height, weight, and sex. That's it.

Turning your TDEE into a goal

Once you know your maintenance number, adjusting is straightforward:

To lose fat: eat 300–500 calories below TDEE — a sustainable ~0.5–1 lb per week.
To gain muscle: eat 200–400 calories above TDEE, train hard, and get enough protein (~0.7–1 g per pound of body weight).
To maintain: eat at TDEE and adjust if the scale trends up or down over a few weeks.

The key word is trends. Your weight bounces day to day from water and food in your gut. Judge by the weekly average, not the morning-to-morning number.

Skip the manual equations

The Mifflin-St Jeor formula isn't something you want to do by hand every time your weight changes. I built a free calculator that does it for you — enter your stats and it gives your BMR, TDEE, and calorie targets for cutting, bulking, or maintaining, all at once.

👉 TDEETally — free TDEE & calorie calculator

No account, no upsell. Recalculate whenever your weight or activity changes.

The bottom line

TDEE is your maintenance calories — the anchor for any nutrition goal. Find it, pick a direction (deficit, surplus, or maintenance), track the weekly trend, and adjust every few weeks. It's not complicated once you have the number; it just requires being consistent long enough to see it work.

How to Convert Any Oven Recipe to an Air Fryer (Time & Temperature Guide)

Lucas M M — Mon, 27 Jul 2026 16:31:43 +0000

Air fryers cook faster and hotter than a conventional oven, which is exactly why your favorite oven recipes come out overdone — or weirdly raw in the middle — when you drop them straight into the basket. The good news: converting an oven recipe to an air fryer is easy once you know the two simple rules.

The two rules of air-fryer conversion

1. Drop the temperature by about 25°F (roughly 15–20°C). An air fryer is basically a small convection oven. The fan circulates hot air right against the food, so it browns and cooks more efficiently. If a recipe says 400°F in the oven, set your air fryer to around 375°F.

2. Cut the cooking time by about 20%. Because that circulating air transfers heat faster, food finishes sooner. A tray of wings that takes 40 minutes in the oven usually needs about 30–32 minutes in the air fryer. Always check a few minutes early the first time you make something.

A quick reference

Oven	Air fryer (approx.)
350°F, 30 min	325°F, ~24 min
400°F, 25 min	375°F, ~20 min
425°F, 20 min	400°F, ~16 min

These are starting points, not gospel. Basket air fryers run hotter than oven-style ones, and a crowded basket cooks unevenly, so give food room and shake or flip halfway through.

Foods that convert beautifully

Chicken thighs, wings, and drumsticks — crispier skin, less time.
Roasted vegetables — cauliflower, broccoli, potatoes, Brussels sprouts.
Frozen foods — fries, nuggets, spring rolls (skip the preheat step entirely).
Reheating leftovers — pizza and fried food come back to life without the sogginess of a microwave.

Foods to be careful with

Wet batters drip through the basket before they set — use breadcrumbs instead.
Delicate baked goods can get blown around by the fan; cover loosely with foil.
Large roasts often don't fit and cook unevenly — the oven still wins here.

Skip the mental math

Rounding "minus 25 degrees and minus 20 percent" in your head while your hands are covered in marinade is annoying. I built a free tool that does it instantly: type in the oven temperature and time, and it gives you the air-fryer equivalent — plus handy oven temperature conversions (°F/°C/gas mark) and cups-to-grams for the recipe itself.

👉 OvenMath — free air fryer conversion calculator

No sign-up, no app to install. Bookmark it next to your air fryer and stop guessing.

The bottom line

Lower the heat by ~25°F, shave off ~20% of the time, don't crowd the basket, and check early. Do that and almost any oven recipe becomes an air-fryer recipe. Once you get a feel for how your specific machine behaves, you'll be converting on autopilot.