Free · No account needed
Free online tools you can use right away
Pick a tool below and start instantly—no app install, no signup. What you type stays on your device; we don’t store your inputs.
Popular tools
- Check lucky SIM number online (VN)Free online check for lucky Vietnamese mobile numbers—/100 score for repeats, 68/86 pairs, digit 4, palindromes. Runs in your browser.
- Numerology by birth date & zodiacLife Path, birthday, attitude & personal year numbers plus Western zodiac from your birth date—with optional gender lens, runs in your browser.
- Solar to lunar calendar & weekdayConvert Gregorian dates to Vietnamese lunar calendar, weekday, and stem-branch (Can Chi)—free, runs in your browser.
- QR code generatorCreate QR codes from URLs or text—preview and download PNG free in your browser.
All tools
Solar to lunar calendar & weekday
Convert Gregorian dates to Vietnamese lunar calendar, weekday, and stem-branch (Can Chi)—free, runs in your browser.
Use tool →Character, word & line counter
Count characters (with/without spaces), words, and lines—handy for SEO, ads, and meta descriptions.
Use tool →JSON formatter & validator
Pretty-print and validate JSON online—data never leaves your browser.
Use tool →Uppercase, lowercase & title case
Convert text case for titles, slugs, and social copy—instantly in the browser.
Use tool →Random password generator
Generate strong passwords with length and charset options—uses crypto.getRandomValues.
Use tool →BMI calculator
Calculate BMI from height (cm) and weight (kg) with WHO categories—for reference only.
Use tool →Loan installment calculator
Estimate monthly payments (principal + interest) from amount, annual rate, and term—standard amortization.
Use tool →Numerology by birth date & zodiac
Life Path, birthday, attitude & personal year numbers plus Western zodiac from your birth date—with optional gender lens, runs in your browser.
Use tool →7-a-side football tactics board
Interactive 7-a-side tactics board—formations 3-2-1, 2-3-1, 3-3… drag player dots on the pitch, one or two teams.
Use tool →QR code generator
Create QR codes from URLs or text—preview and download PNG free in your browser.
Use tool →Currency converter — USD, EUR to VND
Convert USD, EUR, JPY, CNY, KRW, SGD, THB and VND—indicative rates for quick estimates.
Use tool →Remove Vietnamese diacritics
Strip Vietnamese tones, plain ASCII text, and URL slugs—free in your browser.
Use tool →VAT calculator (VND)
Add or extract 8%/10% VAT on VND amounts—for quotes and invoices (estimate only).
Use tool →Age calculator from birth date
Exact age from your Gregorian birth date—years, months, days, and total days lived.
Use tool →Merge PDF files online
Merge multiple PDFs in order (e.g. five bills into one file)—free, runs in your browser, no upload.
Use tool →Check lucky SIM number online (VN)
Free online check for lucky Vietnamese mobile numbers—/100 score for repeats, 68/86 pairs, digit 4, palindromes. Runs in your browser.
Use tool →
Tip: on mobile, add this page to your home screen for quicker access next time.
Need a branded set of lookup tools for your business? Contact us →
FAQ
Do you offer a free PDF merge tool?
Yes—open Merge PDF under Utilities: pick multiple files, reorder, and download one PDF. Processing runs in your browser; we don’t receive your files.
Is my input stored on your server?
No. Everything runs locally in your browser.
Do I need an app or a paid plan?
No. Every tool is free in your browser. You only need internet to load the page the first time.