Blog
Guides and practical tips that pair well with our tools.
Regional Guides
Korean Free Font Licences β What They Still Exclude
Plenty of fonts marked free for commercial use cannot be used in a logo. The places it actually goes wrong: merchandise, embedding, and self-hosting web fonts.
Regional Guides
The Wonder Weeks β 10 Leaps and What the Evidence Says
Why leaps are counted from the due date, when the ten leaps fall, and how well the theory holds up. The parts a calendar alone will not tell you.
Regional Guides
Measuring Ring Size at Home β Why It Comes Out Wrong
String and paper are typically off by a size. Why fingers change through the day, and what to do when the knuckle is wider than the base.
Productivity
Course Registration β Sync to the University's Clock
Registration opens on an exact second. If your clock is three seconds slow it is already over. How to read the school server's own time.
Regional Guides
Best Free Japanese Fonts for Web and Design (2026)
Free Japanese typefaces with commercial-use licenses. Noto Sans JP, Mochiy Pop, Klee, Zen Maru Gothic β the modern picks for designers and developers.
Regional Guides
Japanese Public Holidays & Business Days Guide (2026)
Golden Week, Obon, Year-end break β when Japan stops working and what to know if you're scheduling meetings or shipments with Japanese clients.
Regional Guides
DIN Paper Sizes β A4, A5, Letter and the Maths
A4 vs Letter, A5 vs Half-Letter, why the A-series has that elegant ratio, and which size to use for what. Full DIN paper guide.
Regional Guides
US Shoe Size Guide β Men, Women, Kids (with EU/UK)
Men's US 9 is not the same as Women's US 9. The full breakdown of US shoe sizes β men, women, kids β with EU, UK, and cm conversions.
Regional Guides
Japanese Era Years β Reiwa, Heisei and Showa Converted
Japan uses two parallel calendars β Western years and imperial era names. Convert Reiwa 8 β 2026 instantly, with the full Showa/Heisei/Reiwa table.
Regional Guides
Japanese Shoe Size Conversion β cm, US, EU, UK
Japan uses cm for shoe sizes. Convert to US, EU, UK, and Korea instantly β with brand-specific notes for ABC-Mart, Onitsuka, Asics, and more.
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Instagram Photo Sizes β The Complete 2026 Guide
Optimal dimensions and aspect ratios for Instagram feed, stories, reels, and profile photos β plus why uploads sometimes look blurry and how to fix it.
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Passport Photo Requirements by Country (2026)
Every country has slightly different passport photo rules. US 2Γ2 inch, Korea/Japan/EU 35Γ45 mm β full reference for the major countries.
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Free Background Removal β How to Cut Out Photos Cleanly
Remove photo backgrounds without Photoshop. How AI background removal works, what makes some photos easier than others, and how to fix bad results.
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Profile Picture Sizes β Instagram, X, LinkedIn, Discord
Every social platform crops profile photos differently. Here are the recommended upload sizes and how each platform displays them.
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Image Compression β Cut 70% With No Visible Loss
Smartphone photos are 5β10 MB each. Emails get blocked, cloud storage fills up. Here's how to shrink them with almost no visible quality loss.
PDF & Files
How to Reduce PDF File Size β 3 Methods That Actually Work
Can't email a PDF because it's over the attachment limit? Cut your PDF size by 70% with almost no quality loss using these proven methods.
PDF & Files
Merging Scanned PDFs β Order, Rotation and Size
Scanner gave you 30 separate PDF files? Here's how to combine them in the right order, fix sideways pages, and keep the final size under control.
Calculators
BMI and Asian Standards β Why the Limits Are Stricter
The WHO sets overweight at BMI 25. Korea, Japan, and China use 23. Here's why the Asian threshold is lower and which one applies to you.
Calculators
How to Avoid Currency Conversion Fees β 5 Practical Rules
Between bank spreads, ATM fees, and dynamic currency conversion, you can lose 4β8% on every international transaction. Here's how to keep more of your money.
Calculators
Compound Interest β Why Time Beats Contribution
What does $500/month for 30 years at 5% become? The math of compound growth, its hidden traps (fees, inflation), and how to apply it to savings and investing.
Productivity
How to Create Strong Passwords β 2026 Security Standards
'password123' won't survive a single second of modern attacks. The four rules for genuinely secure passwords in 2026, plus the case for passphrases.
Productivity
Concert Ticketing β Syncing Your Clock to the Server
Taylor Swift tickets, sneaker drops, sold-out flights. The 1-second difference between getting and missing it. Server time sync, prep checklist, and click strategy.
Productivity
QR Codes β A Practical Guide for Business and Daily Use
Menus, business cards, event tickets, WiFi sharing. How to make QR codes that scan reliably and where they work best.
Productivity
How to Type Faster β 40 WPM to 80 WPM in One Month
Average office worker types 40 WPM. Get to 80 WPM and you save an hour a day. A practical plan that works in 10 minutes of daily practice.
Productivity
Word and Character Counts β Tweets, Essays and Theses
Tweet limits, college essay caps, blog SEO ranges, thesis word counts. The right length for each kind of writing β and how counters measure them.
Regional Guides
Korean Shoe Size to US, EU, Japan β Cross-Reference Guide
Korean size 240 in US, UK, EU? Different for men and women. The full conversion table for online shopping across regions.
Regional Guides
Korean Age β Man-nai, Se-neun-nai and Yeon-nai Explained
Korea officially switched to international age in June 2023, but traditional Korean age is still common in daily life. Here's how the three systems differ.
Regional Guides
Business Days in Korea β Holidays and Substitute Days
When does '3 business days' actually end in Korea? Public holidays, substitute holidays, and what they do to shipping and banking deadlines.
Regional Guides
Top 10 Free Korean Fonts for Designers (2026)
Pretendard, KoPub, Nanum, and more. The best commercial-use-free Korean fonts of 2026, sorted by purpose, with license details.
Calculators
Pregnancy Weeks β How Korean OB-GYNs Count Them
How Korean OB-GYNs calculate weeks and due dates (Naegele's rule), how IVF differs, and the standard prenatal exam schedule.