免费在线工具
268+ free online tools for PDF, images, SEO, developers, color, and productivity. Fast, browser-based, and private — no signup, no installs, no limits. Search above or browse by category below.
Total tools26810.8K total uses
Categories13Active categories
Most usedJSON Formatter4.1K uses
Recently addedExperiment RandomizerNewest tool
Body Fat Calculator
Estimate body fat percentage using the US Navy circumference method with neck, waist, and hip measurements.
Used 0 times•Updated never
Restaurant Profit Calculator
Calculate restaurant net profit, food and labor costs, prime cost ratio, and profit margins from sales and operating expenses.
Used 0 times•Updated never
Time Calculator
Calculate time differences and add or subtract hours, minutes, and seconds from any clock time.
Used 0 times•Updated never
Tip Calculator
Calculate tip amount, total bill, and fair split per person with quick percentage presets.
Used 0 times•Updated never
Receipt Generator
Create printable sales receipts with items, tax, payment details — preview, print, or download as PDF.
Used 0 times•Updated never
Quotation Generator
Create professional price quotations with line items, tax, and validity dates — preview, print, or download as PDF.
Used 0 times•Updated never
SKU Generator
Generate product SKU codes from brand, category, product, color, size, and variant fields with custom separators and sequences.
Used 0 times•Updated never
Unsloth Dataset Builder
Unsloth dataset builder free — create fine-tuning JSONL for Alpaca, chat messages, tool calls, or raw text. Import, validate, split train/eval, export.
Used 0 times•Updated never
Molar Mass Calculator
Molar mass calculator free — parse chemical formulas like H2O or Ca(OH)2 and get g/mol with an element breakdown. Browser-based, instant, no signup.
Used 0 times•Updated never
Chemical Equation Balancer
Chemical equation balancer free — balance reactions like H2 + O2 → H2O with correct coefficients. Instant stoichiometry in your browser, no signup.
Used 0 times•Updated never
Molarity Calculator
Molarity calculator free — find M, moles, or volume with M=n/V. Convert mass to molarity using formula lookup. Instant chemistry in your browser.
Used 0 times•Updated never