InvoiceLux | HTML5 Client-Side Invoice & Financial Tools Suite

InvoiceLux | HTML5 Client-Side Invoice & Financial Tools Suite

A complete, self-contained browser-based invoicing and business finance suite with 44 tools. No server, no backend, no dependencies. All processing runs entirely in the user’s browser.

Key Facts

• 44 invoicing, business document, and finance tools in a single package
• Zero server required — static HTML, CSS, and JavaScript only
• No PHP, no database, no backend of any kind
• No build tools — no npm, no bundler, no configuration
• Ad-ready — pre-wired monetization slots in one config file
• Fully responsive — works on desktop, tablet, and mobile, with a dedicated mobile navigation menu
• Light and dark themes — toggleable site-wide, persisted across visits
• Zero external JavaScript dependencies for core tools — vanilla JS throughout, with Chart.js loaded only on tools that render charts, and jsPDF + html2canvas lazy-loaded from CDN only when a user clicks Download PDF
• Privacy first — data entered into tools never leaves the browser; data saved by tools (clients, expenses, time entries, invoice tracker, signatures, QR codes, payment terms, invoice numbers, price lists, proposals) is stored locally via localStorage

Technical Requirements

• Server: None required. Deploy to any static host (Netlify, Vercel, GitHub Pages, shared hosting, CDN) or open index.html directly from the file system.
• PHP: Not required. This is a pure HTML/CSS/JavaScript application.
• Database: Not required. Tools that save data (Client Database, Expense Tracker, Invoice Tracker, Time Tracker, Digital Signature, QR Payment, Payment Terms Builder, Invoice Numbering, Price List Builder, Client Proposal Builder) use the browser’s localStorage.
• JavaScript: Must be enabled in the browser.
• Charts: Tools with charts (Break-Even, Cash Flow Planner, Invoice Tracker, Profit Margin Calculator, Expense Tracker, Time Tracker) load Chart.js from a CDN.
• Internet connection: Required for Google Fonts, Chart.js, jsPDF, and html2canvas to load in their intended form. Core invoice generation and calculation tools remain functional without it using system fonts and graceful fallbacks. jsPDF and html2canvas are lazy-loaded from cdnjs.cloudflare.com only when a user clicks Download PDF — they are not loaded on page load.
• Third-party CDN dependency notice: Chart.js, jsPDF, html2canvas, and Google Fonts are external, third-party services loaded from their respective CDNs (cdnjs.cloudflare.com and fonts.googleapis.com). These are not bundled with the product and are outside the developer’s control — their availability, uptime, and versioning are managed solely by the respective third parties.

Browser Compatibility

• Google Chrome 80 and above
• Mozilla Firefox 78 and above
• Apple Safari 13 and above
• Microsoft Edge 80 and above

No browser plugins or extensions required. JavaScript must be enabled.

Features

Invoice Generator (8 templates)

• Classic Invoice — Professional single-column invoice with company name, line items, tax, discount, and PDF export
• Modern Invoice — Two-column sleek layout with customizable accent color and bank/payment details block
• Minimal Invoice — Clean, borderless style for studios and freelancers
• Corporate Invoice — Bold letterhead-style header with company registration number, PO reference field, and authorized signatory
• Creative Invoice — Colorful branded layout with custom accent color and full-bleed colored header
• Freelance Invoice — Service-based invoice with hourly/daily rate rows, project milestones, retainer support, and deposit/balance-due tracking
• Zakat & Sadaqah Receipt — Official Islamic donation receipt for Zakat al-Mal, Sadaqah, Fitrana, and other charitable contributions, with organization and donor details, itemized donation rows, purpose/allocation field, optional tax deduction note, and a Barakah closing statement
• Islamic Trade Invoice — Halal-compliant trade invoice with Bismillah header, optional Halal certification badge, itemised goods/services table, no-riba (interest-free) notice, payment method field, and full Islamic currency support (SAR, AED, PKR, MYR, IDR, BDT)

Business Documents (11 tools)

• Quote Generator — Professional price quotes with discount/tax breakdown, a drawable/typed client acceptance signature, and auto-dated acceptance block
• Receipt Maker — POS-style printable receipts with tax, optional gratuity, and itemized totals
• Purchase Order — PO documents with vendor details, required-by date, and authorized-by field
• Credit Note — Refund and credit documents referencing the original invoice number
• Proforma Invoice — Export-ready proforma with country of origin, HS/tariff code, and Incoterms (EXW, FOB, CIF, DAP, DDP) fields
• Delivery Note — Shipment/delivery documentation with item quantities, packing details, carrier, and tracking reference
• Statement of Account — Running-balance client statement built from invoice, payment, and credit transactions with opening balance
• Remittance Advice — Payment confirmation document listing invoices paid and amounts settled
• Retainer Agreement — Monthly retainer contract with included hours cap, overage rate, rollover policy, and optional tax
• Work Order — Service work orders with technician assignment, work location, task breakdown, and signature lines
• Contract Generator — Service/freelance contract builder with optional clauses for revision rounds, confidentiality/NDA, termination, and dispute resolution

Finance Calculators (11 tools)

• Tax Calculator — Add or extract VAT/GST/PST/Sales Tax, with multi-rate breakdown and in-session calculation history
• Zakat Calculator — Business and trade Zakat calculation against gold (87.48 g) or silver (612.36 g) Nisab thresholds, with full asset/liability breakdown including gold & silver holdings
• Murabaha Pricing Tool — Halal cost-plus pricing calculator with transparency statement and generated Murabaha sale agreement, including installment schedule
• Currency Converter — Convert between 35 currencies using built-in offline reference rates, with a multi-currency comparison table
• Discount Calculator — Percentage, flat amount, Buy-X-Get-Y, tiered quantity, and early-payment discount modes with optional post-discount tax calculation
• Profit Margin Calculator — Gross/operating/net profit and margin analysis with markup-vs-margin comparison table and bar chart
• Break-Even Calculator — Break-even units and revenue calculator with a revenue/cost/profit line chart
• Cash Flow Planner — Multi-month income/expense projection with fixed, growing (+5%/month), and seasonal line items, plus a balance bar chart
• Invoice Aging Report — Overdue invoice tracking grid with Current, 1–30, 31–60, 61–90, and 90+ day aging buckets and color-coded summary totals
• Hourly Rate Calculator — Calculate minimum hourly rate from target income, overhead, profit buffer, and billable hours, with a rate scenario table
• Invoice Splitter — Split an invoice equally, by percentage, custom amounts, or fixed installments, generating individual mini-invoices with due dates

Business Tools (14 tools)

• Expense Tracker — Log and categorize business expenses with billable/non-billable tracking, filtering, CSV export, and a category donut chart (saved locally)
• Time Tracker — Live timer and manual time entry with hourly rate, billable totals, per-project bar chart, and a button to generate a Freelance Invoice from logged hours (saved locally)
• Invoice Tracker — Status dashboard for invoices (draft, sent, paid, partial, overdue, canceled) with automatic overdue detection, status donut chart, and CSV export (saved locally)
• Client Database — Store client contact details, VAT numbers, payment terms, and currency preferences, with CSV import and export (saved locally)
• Digital Signature Pad — Draw your signature on a canvas pad or apply a typed name in script font, save to an in-browser library, and export to PNG, JPEG, or SVG (saved locally)
• QR Payment Link — Generate scan-to-pay QR codes for PayPal, Venmo, Cash App, Revolut, or custom payment links, with PNG, SVG, PDF, and image export (saved locally)
• Invoice Number Generator — Configurable invoice numbering (prefix, client code, year/month format, zero-padding) with batch generation and CSV export (saved locally)
• Payment Terms Builder — Build payment terms text from a library of templates plus custom Net-X periods, early payment discounts, late fees, and accepted payment methods (saved locally)
• Business Card Maker — Six built-in themes (Classic, Dark, Minimal, Bold, Gradient, Outline) with custom accent color, print export, PDF (A6 landscape), and image download
• Letterhead Maker — Branded letterhead/letter generator with logo area, address block, custom header and accent colors, and PDF export
• Client Proposal Builder — Project proposal builder with executive summary, scope, deliverables, pricing table, milestones/timeline, T&Cs, and acceptance signature block (saved locally)
• Price List Builder — Categorized service/product price list with custom currency, accent color, and validity date (saved locally)
• NDA Generator — Mutual or one-way NDA builder with jurisdiction clause and optional clauses for return of materials, non-solicitation, non-competition, and injunctive relief
• Invoice Reminder Generator — Five-stage payment reminder generator (Friendly, First, Second, Firm Notice, Final Notice) across Email, Formal Letter, and Short SMS formats with three tone options (Polite & Professional, Warm & Personal, Firm but Respectful)

Monetization and Ad Integration

InvoiceLux ships with pre-wired ad slots. Ad code is contained in config/ads.js, so buyers can activate monetization by editing one location only. No JavaScript knowledge is required.

Responsive Design

All pages adapt to the user’s screen size. Below 768px, the desktop navigation is replaced by a hamburger menu that opens a full-height, scrollable mobile navigation panel listing all 44 tools grouped by category. The theme toggle and mobile menu both respect the active light/dark theme.

Themes

Every page includes a light/dark theme toggle in the header. The selected theme is saved to localStorage and applied automatically on return visits, across the homepage and all 44 tool pages.

Fonts

Google Fonts are loaded via CDN — not bundled locally. Pages load Bricolage Grotesque, DM Sans, and DM Mono from fonts.googleapis.com. An active internet connection is required for the fonts to render in their intended style. The toolkit falls back to the system sans-serif/monospace stack automatically when the CDN is unavailable.

PDF Export

Every tool’s Download PDF button uses jsPDF (v2.5.1) and html2canvas (v1.4.1), both loaded on demand from cdnjs.cloudflare.com — only when the user triggers a PDF download, not on page load. html2canvas captures the rendered document as a canvas, and jsPDF converts it into a paginated PDF file downloaded directly in the browser. No server, no file upload, no third-party SaaS involved. Some tools also provide a separate Print button using the browser’s native print dialog.

Customization

All shared components — header, footer, and ad slots — are defined in the config/ directory. Edit one file and the change propagates to every page automatically.

• config/header.js — Brand name, logo, navigation dropdowns (Invoice Generator, Business Docs, Finance Tools, Business Tools), theme toggle, and mobile navigation menu
• config/footer.js — Full site footer
• config/tool-page-footer.js — Compact footer bar on every tool page
• config/ads.js — Ad slot variables with placeholders — the only file needed to activate ads

All colors, typography, and spacing are CSS custom properties under root in assets/css/style.css, assets/css/index.css, and assets/css/tool.css. Update a token once, and all pages reflect the change.

Getting Started

1. Extract the ZIP archive to your web root or any local directory
2. Open index.html in any modern browser — all 44 tools are immediately functional
3. To activate ads, open config/ads.js and replace the placeholder blocks with your ad network code
4. To rebrand, edit config/header.js and config/footer.js with your brand name and links

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