Welcome to Lanren Toolkit — what treasure are you digging for today?
I'm Miantuan, the store manager (and mascot)! Everything on these shelves is free to use, no signup and nothing to install — just open a tool and go. Every calculation runs right in your browser, and you're always welcome to give me a pat on the way out 🐾
💰 Finance Tools
Loans, retirement, exchange rates — answers in seconds
Loan Calculator
Enter loan amount, interest rate and term to get your monthly payment and total interest.
Retirement Savings Calculator
Enter your current savings and monthly contribution to estimate your retirement nest egg.
NEWCurrency Converter
Convert major fiat currencies plus 16 cryptocurrencies (BTC, ETH & more) in real time with 24h change.
Discount / Percentage Calculator
Enter the original price and discount to see the final price, savings, or any percentage.
NEWBill Splitter
Split evenly or settle up a group trip/dinner where everyone paid different amounts — instantly see who owes who.
NEWTip Calculator
Enter the bill amount and tip percentage to get the tip, total, and per-person split — handy dining abroad.
🛠️ Utility Tools
The everyday tools you always end up searching for
QR Code Generator
Enter a URL or text and get an instant, downloadable QR code image.
Password Generator
Generate strong random passwords with custom length and character sets.
Unit Converter
Convert length, weight and temperature units all in one place.
NEWImage Compressor / Converter
Convert between JPG, PNG and WebP with adjustable quality — images never leave your browser.
Color Converter
Convert between HEX, RGB and HSL with a color picker and one-click copy.
Timezone Converter
Pick a source and target city to instantly convert the time between them.
NEWWord & Character Counter
Instantly see word/character/line/paragraph counts, with a live check against social media post limits.
🎓 Teacher & Student Tools
Roll call, grouping, and grades — all in one place
Random Group Divider
Paste a name list or enter a headcount to split people evenly into groups — great for classrooms.
NEWClassroom Random Name Picker
Paste a class roster and draw names at random — no repeats within the same round.
NEWRandom Seating Chart Generator
Set rows and seats per row, paste a roster, and assign everyone a seat with one click.
NEWGPA & Weighted Grade Average Calculator
Enter each course's credits and score to get your weighted average plus a 4.0 GPA scale conversion.
NEWAttendance Sheet Generator
Paste your roster and pick a date range to generate a student-by-date sign-in grid — print it or export a CSV.
NEWMulti-Round Group Discussion Timer
Set round count and minutes per round — it auto-advances and cues each transition, great for group work or debates.
NEWReport Card Comment Bank
Check off positive comments by category and they combine into an editable paragraph, ready to copy into report cards.
NEWQuiz & Assignment Gradebook
Add students and assessment items, enter scores over time, and get running averages — saved in your browser automatically.
NEWCitation Generator
Choose APA or MLA format, fill in the details, and get a correctly formatted citation instantly.
🎉 Social & Event Tools
Great for community giveaways and live events
Lucky Draw Assistant
Draw winners from IG/FB comment lists or raffle tickets at live events — fair and random.
NEWBingo Card Generator
Paste your own words, numbers, or theme items, set a grid size and card count, and shuffle out multiple non-repeating bingo cards — great for parties and office events.
NEWQuick Poll / Vote Tool
Manual host tallying with automatic percentage and bar charts, or a share link people can vote on — honest about not faking real-time multi-device sync.
NEWIcebreaker / Team-Building Game Ideas
Enter your headcount and occasion, draw from 60+ real icebreaker games, two-truths-and-a-lie prompts, and pictionary words.
NEWToast Speech / Cheat-Sheet Generator
Pick an occasion, fill in names and relationships, and get a ready-to-read draft speech from a real template library.
NEWSecret Santa / Gift Exchange Generator
Set exclusion pairs if needed, generate everyone's draw result, and share private per-person links so no one sees the full pairing.
NEWLive Tally Counter
A quick manual tallying aid for show-of-hands votes, with a correction button and leader highlight.
🧳 Travel Abroad Tools
When you're somewhere unfamiliar, these help
Customs Duty-Free Allowance Checker
Enter what you're carrying to instantly check if you're over the duty-free limit entering your destination or Taiwan.
NEWTax Refund Calculator
Pick a shopping country and enter your spend to check if you clear the refund threshold and estimate how much back.
NEWEmergency Contact Card
Pick a destination to instantly see local police/ambulance numbers and Taiwan's overseas mission contacts there.
NEWClothing & Shoe Size Converter
Pick a category and a size you know to instantly see the matching size across TW/JP/KR/US/UK/EU.
NEWTravel Plug & Voltage Checker
Pick a destination country to see its plug type, voltage, and whether you need an adapter.
NEWEmergency Travel Phrasebook
Pick a situation and a language to instantly see common phrases with romanization — just show the screen and point.
🎲 Life & Fun Tools
For health, time management, and when you can't decide
BMI Calculator
Enter your height and weight to get your BMI and healthy weight range.
Pomodoro / Countdown Timer
Auto-cycling focus and break timer, or switch to a custom countdown.
NEWRandom Picker
Roll a dice, flip a coin, or let the tool decide what to eat today.
Date / Age Calculator
Enter a birthday to get your exact age, or find the days between two dates.
NEWTravel Packing List Generator
Enter trip length, destination climate, and trip type to generate a categorized packing checklist.
🐾 Pet & Plant Tools
For when you can't quite tell the right frequency or budget
Pet Age Calculator
Enter your pet's age and size to convert it to human years using a size-adjusted formula, not just ×7.
NEWPet Ownership Cost Estimator
Pick your pet type and ownership stage to estimate a monthly and yearly cost range before you commit.
NEWPet Food & Calorie Calculator
Enter your pet's weight and life stage to estimate daily calorie needs and feeding amount in grams.
Plant Care Guide
Pick plant type, light, and season to get a suggested watering frequency and care tips.
Thanks for stopping by! This shop keeps getting new tools, and everything stays free with no signup required. If you want to dig deeper into how a tool actually works, check the Guides shelf for a few longer articles. And if something worked well for you, drop a note in Feedback — I read every one 🔔✨