ToolBox - Free online tools collection, fast and easy to use.
When taking a mortgage, should you choose equal installment or equal principal? We compare the interest difference and best-fit borrowers of both repayment methods with real cases.
A read on the latest 2026 mortgage rate policies, LPR trends, and future outlook to help you time your home purchase.
A complete guide to 2026 special additional deductions - child education, mortgage interest, elderly care, and more.
What is the normal BMI range? Learn the BMI standard, how to calculate it, plus health management tips.
How your housing fund loan limit is calculated, and how contribution years, balance, and monthly contributions affect it.
Date math is handy every day - contract management, project scheduling, trip planning, and more.
What is a standard weight? Reference charts for men and women with standard weight formulas.
Overtime rules explained: 1.5x on workdays, 2x on rest days, 3x on holidays, plus how to calculate it.
A free online image compression guide - processed locally in your browser (no upload), supports JPG/PNG/WebP.
Discount formulas, how markdowns work, and the difference between thresholds and discounts to compute sale prices fast.
What compound interest means, the formula behind it, and how to use it for long-term investing.
Car loan payment and interest calculation, down-payment choices, and total interest - all with a calculator.
The age calculator works down to days, months, and years; learn exact, nominal, and precise age methods and when to use them.
Electricity cost formulas and an appliance usage reference table to estimate your monthly bill and plan usage.
Fuel consumption formulas and per-km cost estimates to learn your car's real mileage.
Quick-reference tables for length, weight, temperature, area, and volume - the conversions you use most.
How to calculate ovulation, estimate safe days, and find the best time to conceive.
Compare interest and monthly payments across equal-installment, equal-principal, and interest-only plans.
Differences, use cases, and conversion methods for common image formats to help you choose.
Cropping and resizing methods, aspect-ratio tricks, and ideal sizes per platform.
How to Base64-encode images, when to use it, pros and cons, to decide if embedding fits your page.
How to use a color picker, common palettes, and HEX/RGB/HSL conversion.
When to count words, CN vs EN counting differences, and word-count tips for SEO writing.
Uppercase, lowercase, title case, camelCase, and more - for coding and writing.
Why format JSON, why validate online, common JSON errors, and how to fix them.
How Base64 encoding works, common use cases, and online encode/decode - for developers and everyone.
How URL encoding works, handling special characters, and front-end encode/decode scenarios.
Common cleanup scenarios - strip extra spaces, blank lines, and tabs to tidy messy text.
How to strip HTML tags, keep plain text, and extract text from web pages.
When to compare text, how diffing works, and version-control comparison tips.
UUID versions, format, use cases, and how to generate them in bulk.
Reading speed benchmarks, estimating time by content type, and planning your writing.
How to compute keyword density, the best-practice range, and the risk of stuffing.