MAKE SMALL THINGS DELIGHTFUL
Open a browser, find something delightful.
180 free online tools and playful experiments covering images, development, PDFs, everyday calculations, education and math puzzles. Everything runs locally in your browser — no sign-up, no upload, ready when you are.
180 online tools Data never leaves your browser Free · no sign-up
Browse by category
Ten categories — open the toolbox for every tool in each.
Recommended for you
Featured tools
The most-used ones, ready to go; use search or categories for the rest.
QR code generator
Turn links, text, Wi-Fi credentials or contact details into a QR code with adjustable error correction and colors.
Open tool → Local onlyImage compressor
Shrink JPG, PNG or WebP files with quality and size controls, then download the result — perfect before sharing.
Open tool → Local onlyText workbench
Strip blank lines, drop duplicates, convert character width, fix CJK spacing and watch live character, line and byte counts.
Open tool →Chart maker
Bar, line and pie charts from data.
Open tool →Scientific calculator
Trig / log / powers.
Open tool →Mortgage calculator
Estimate monthly payment, total interest and repayment for both plans.
Open tool →Currency converter
Convert USD, EUR, JPY and 18 currencies instantly with reference rates.
Open tool →Unit converter
Length, weight, temperature, area, data and speed — li/jin/mu included.
Open tool →BMI calculator
Compute BMI and healthy weight range from height and weight.
Open tool →Age calculator
Enter a date of birth to get exact age, nominal age, days lived and the days until your next birthday.
Open tool →JSON formatter & validator
Beautify or minify JSON, validate syntax and jump straight to the error line and column.
Open tool → NewSolid geometry
Surface area & volume for 7 solids with term-by-term formulas and a rotatable 3D preview.
Open tool →Something lighter
Small surprises where characters, shapes and rules collide.
Explore characters
Look at familiar Chinese characters from a new angle and rediscover how they are built.
Open tool →Character practice sheets
Watch stroke order come to life — a nice place to linger for a few minutes.
Open tool →Crystal minesweeper
Classic rules with a crystalline coat of paint. Find the safe path and trust your judgement.
Open tool →BUAA Life
A retro Windows 98-style life simulator you can play right in the browser — a nostalgic campus life from the early 2000s.
Open tool →180 tools, all inside your browser.
No sign-up, no upload: images, text, PDFs, calculators and learning tools open instantly, and private data never leaves your device. Bookmark it and come back anytime.
按主题深入Explore by theme
五个工具专题、十篇实操指南与六张速查表：想系统解决一类问题，从这里进比逐个试工具更快。Five tool collections, ten practical guides and six reference tables — if you want to solve a whole category of problem, start here instead of trying tools one by one.