Free Business Tools & Calculators
Every free invoice24 tool in one place, built for Japan businesses — invoicing, payroll, tax calculators, converters, PDF tools, and generators. All free, no sign-up required.
Invoicing & Documents
請求書ジェネレーター →Create and send professional invoices, free, no sign-up required.領収書作成ツール →Generate itemized, print-ready receipts for any sale or payment.見積書作成ツール →Create a professional quote or estimate to send to a prospective client.発注書作成ツール 日本 →Create and send purchase orders to suppliers, tracked and print-ready.経費精算書作成ツール →Log business expenses and generate an expense report for reimbursement or accounting.請求書テンプレート →Free, downloadable invoice templates in Word, Excel, and PDF.Invoice Generators by Industry →Invoice generators tailored field-by-field to your specific trade or profession.電子署名 →Sign documents electronically or collect signatures from clients online.
Payroll & Tax Calculators
消費税計算機 →Calculate the correct sales/VAT/GST tax to charge on an invoice.給与計算ツール →Calculate gross-to-net salary, tax, and deductions for an employee.Payslip Generator →Generate compliant, itemized payslips for employees each pay period.Income Tax Calculator →Estimate personal income tax owed based on income and allowances.Corporation Tax Calculator →Calculate corporation/company tax owed on business profits.
Project & Time Tracking
Project Cost Calculator →Estimate total project cost from labor, materials, and overheads.Revenue Forecaster →Forecast future revenue based on historical growth and trends.Work Hours Calculator →Calculate total hours worked between a start and end time.Time Card Calculator →Total up weekly time card hours for payroll, including overtime.
Business Calculators
Margin Calculator →Work out profit margin, markup, and selling price from cost and margin percentage.Percentage Calculator →Calculate percentages, percentage change, and percentage of a total instantly.Loan Calculator →Estimate monthly repayments, total interest, and amortization for any loan.Investment Calculator →Project mutual fund and investment growth with compounding returns over time.住宅ローン計算機 →Calculate mortgage repayments, interest, and amortization schedules.Date Calculator →Add, subtract, or find the difference between dates in days, weeks, or months.材積計算 →Calculate timber volume, cut lists, log scaling, and firewood conversions.簡易課税 計算 →Work out flat-rate or simplified-scheme tax owed for small businesses.
Converters & Lookup Tools
通貨換算ツール →Convert between world currencies using live exchange rates.Unit Converter →Convert length, weight, volume, area, temperature, and more between units.Timezone Converter →Compare times across timezones and find overlapping working hours.銀行コード →Look up bank routing, sort, or SWIFT/IBAN codes for domestic and international transfers.
PDF Tools
Edit PDF →Add text, images, and annotations to any PDF directly in your browser.Merge PDF →Combine multiple PDF files into a single document in seconds.Split PDF →Extract specific pages or split a PDF into multiple separate files.Compress PDF →Reduce PDF file size for easier sharing and emailing without losing quality.PDF to Word →Convert a PDF into an editable Word (.docx) document.PDF to Excel →Extract tables and data from a PDF into an editable Excel spreadsheet.Word to PDF →Convert a Word document into a shareable, print-ready PDF.JPG to PDF →Combine one or more JPG images into a single PDF file.PDF to JPG →Convert each page of a PDF into a high-quality JPG image.
Generators & Design Tools
QR Code Generator →Create a free QR code for a URL, Wi-Fi network, contact card, or plain text.Logo Maker →Design a professional logo for your business in minutes, no design skills needed.Business Card Maker →Create and download print-ready business cards with your branding.Business Name Generator →Generate unique, available business name ideas for your new venture.SKU Generator →Generate consistent, structured SKU codes for your product inventory.Random Number Generator →Generate random numbers within a custom range for draws, samples, or testing.Password Generator →Create strong, random passwords with customizable length and character sets.Word Counter →Count words, characters, sentences, and estimated reading time instantly.Remove Image Background →Automatically remove the background from any photo or product image.