Herramientas Web y Utilidades de Negocio Gratis

Suite completa de PDF en el navegador. Une múltiples PDFs, agrega/elimina/reordena/gira páginas, agrega texto, firmas digitales y marcas de agua sin subir a servidores.

Creador profesional de facturas y cotizaciones para autónomos, comercios y agencias. Registro de horas de trabajo, códigos QR de pago y PDF vectorial.

Editor de fotos gratuito en el navegador. Recorta, redimensiona, gira, voltea y añade marcas de agua o texto al instante sin subir a servidores.

Compress photos to exact target sizes (<50KB, <100KB, <200KB) for government/job portals and strip private GPS/camera metadata with zero server upload.

Creador de currículums profesional y privado con plantillas optimizadas para ATS, analizador de puntuación en tiempo real y descarga instantánea en PDF.

Crea códigos QR personalizados de alta resolución para enlaces, WiFi, contactos vCard, pagos, correos electrónicos con logos integrados y exportación a SVG.

Velocímetro de Internet en vivo y diagnóstico de conexión de alta precisión. Mide descarga, subida, latencia ping, jitter y datos de proveedor.

Potente formateador y visor en árbol de JSON con total privacidad. Formatea JSON desordenado, valida sintaxis y guarda localmente sin servidores.

Creador interactivo de JSON visual de tipo arrastrar y soltar. Construye objetos y arreglos complejos con sincronización de código en tiempo real.

Cryptographically secure password generator, human-friendly multi-word passphrases, and PIN maker with live Shannon entropy & brute-force crack time scoring.

Generador profesional de recibos de sueldo para empresas, autónomos y startups. Cálculo automático de ingresos, deducciones, impuestos y exportación a PDF vectorial.

Creador online de acuerdos de confidencialidad (NDA) y contratos de servicios para freelancers. Firma digital doble y exportación a PDF.

Calculate how extra monthly and yearly prepayments cut years off your home or car mortgage and save thousands in interest with interactive amortization tables.

Calculadora interactiva de crecimiento de inversiones e interés compuesto con depósitos regulares, ajuste por inflación, gráficos interactivos y tablas de amortización.

Calculadora financiera interactiva para fijación de precios en e-commerce y comercio. Calcula margen bruto %, margen sobre costo %, beneficio neto y punto de equilibrio.

Generador de órdenes de compra (PO) y albaranes de entrega para comercio mayorista y minorista. Desglose de artículos, datos de transporte y exportación a PDF.

Professional business expense report and reimbursement claim sheet. Itemize travel, meals, mileage, and tax with digital signature approval and PDF/CSV export.

Calculate your true billable hourly and daily rate factoring in self-employment taxes, business overhead, billable hours ratio, and vacation days.

Executive project proposal and Scope of Work (SOW) maker for agencies and freelancers. Milestones, deliverable tables, payment schedules, and PDF signatures.

Create official Employment Offer Letters and Work Experience / Relieving Certificates on corporate letterhead with digital signatures and PDF export.

Creador de actas de reunión y agendas ejecutivas. Registra asistentes, decisiones clave y tareas con exportación a PDF y Markdown.

Draw smooth transparent e-signatures with automatic whitespace crop, and generate official circular corporate seal stamps with SVG vector export.

Visual side-by-side text & code diff comparison, case converter (camelCase, snake_case, Title Case), whitespace cleaner, and live reading time analytics.

100% offline, privacy-first JWT token debugger, expiration tracker, Base64 encoder/decoder, and SHA-256 / SHA-512 cryptographic hash calculator.

Genera códigos de barras Code 128, EAN-13, UPC-A y códigos QR personalizados para inventario con hojas de etiquetas imprimibles en lote y PDF vectorial.

Multi-city 24-hour visual timezone comparison matrix. Detect mutual 9-to-5 working hour overlaps across remote teams and generate 1-click calendar invites.

Generate trackable marketing campaign URLs for Google Analytics 4 (GA4) and Meta with channel presets, bulk batch tagging, and instant QR codes.

Simulate and validate how your link cards render across LinkedIn, Twitter/X, Facebook, Slack, and WhatsApp with live HTML meta tag generation.

Create custom Android app icons and full Adaptive Icon asset packages. Design vector icons, preview parallax & masks (Circle, Squircle, Teardrop), and export complete mipmap densities (mdpi to xxxhdpi) + 512px Play Store icons in one click.

Design pixel-perfect iOS app icons with Apple HIG superellipse curvature and gold ratio grid guides. Generate complete Xcode AppIcon.appiconset with valid Contents.json, 1024px App Store marketing icon, and iOS 18 Light/Dark/Tinted modes.

Create high-converting App Store & Google Play marketing screenshots. Upload app screens, wrap in realistic iPhone 16 Pro and Pixel 9 Pro device frames, add 3D gradients, marketing titles, ratings badges, and batch export.

Design, preview, and download a 100% self-contained single-file HTML personal profile or link-in-bio website. Host for free on GitHub Pages, Cloudflare Pages, Vercel, or Netlify.

Craft high-performing prompts for ChatGPT, Claude, Gemini, DeepSeek, and Midjourney/Flux. RTF, Few-Shot, and Chain-of-Thought frameworks with 1-click export.

Convert plain English descriptions into verified Regular Expressions, SQL queries, Cron schedules, and Excel formulas with live interactive test visualizers.

Calculate exact token counts with visual heatmaps and compare estimated prompt & completion costs across GPT-4o, Claude 3.5, Gemini 1.5, DeepSeek, and LLaMA.

100% private in-browser text summarizer and readability analyzer. Extractive TextRank summaries, Flesch-Kincaid scoring, reading time, and sentiment indicators.

Turn blunt, frustrated, or messy thoughts into polite, professional, and diplomatic emails with custom tone, audience controls, and live token usage tracking.

Benchmark top AI models side-by-side with your free Gemini key. Compare response quality, latency, and tokens/sec in-browser.

Chat with contracts, research papers, and notes 100% in-browser. Zero server document uploads with direct citation highlights.

Explain complex algorithms, generate full unit test suites, optimize performance, and audit code for security bugs in-browser.

Convert plain English into optimized SQL queries with schema awareness and performance index recommendations across 5+ dialects.

Turn rough ideas into high-converting viral X threads, LinkedIn authority posts, newsletter blurbs, and SEO meta tags with zero subscriptions.

Calculate safe bunk quotas and recovery class requirements for university 75%, 80%, or custom attendance rules. Subject-wise tracker with local storage.

Calculate semester SGPA, cumulative CGPA, and forecast required grades to graduate with honors. Supports 4.0 US Scale, 10.0 Scale, and percentages.

Instant academic citation generator for websites, books, journals, and videos in APA 7th, MLA 9th, Chicago, Harvard, and IEEE styles with BibTeX export.

Real-time essay word counter, standard double-spaced page estimator, oral speech presentation timer, and Flesch-Kincaid readability scoring.

Click-to-insert visual math equation builder and LaTeX editor. Export high-resolution PNG images, SVG vectors, MathML, and LaTeX code for Word & Docs.

Track multi-subject finals countdowns, automatically calculate daily chapter study quotas, and generate printable A4 revision schedules.

Customizable 25/5 and 50/10 study timer with task checklists and 100% offline Web Audio synthesized ambient soundscapes (Rain, 40Hz Waves, Ocean).

College living cost and pocket money planner. Calculate monthly rent, meal plans, textbooks, and find your safe daily spending allowance.

Send WhatsApp messages to any number worldwide without saving to contacts, plus split long texts and stories into clean, numbered WhatsApp status updates with 1-click copy.

Generate 1-click social share links, WhatsApp status updates, and deep-link intent URLs for X (Twitter), LinkedIn, Telegram, Reddit, and Facebook with automatic UTM campaign tagging.

Design aesthetic 9:16 vertical cards for WhatsApp Status, Instagram Stories, Snapchat, and Facebook Stories with glassmorphic cards, gradient meshes, custom stickers, and HD PNG export.

Create pixel-perfect fake tweets, Threads posts, and LinkedIn cards with verified badges, custom engagement numbers (likes, views), media uploads, and dark/light modes.

Turn quotes, thoughts, code snippets, and poetry into aesthetic visual status cards for WhatsApp Status, Instagram Stories, and LinkedIn with custom gradients and glassmorphism.

Simulate and test YouTube video thumbnails and titles across Desktop, Mobile Dark/Light feeds, Sidebar suggestions, and A/B comparison tests before publishing.

Create high-converting multi-slide swipeable carousels for Instagram and LinkedIn with automatic multi-page PDF generation ready for LinkedIn document posts.

Create customizable Link in Bio micro-websites for Instagram, TikTok, and Twitter, and export as a self-contained standalone HTML website you own completely.

Create cross-client compatible HTML email signatures for Gmail, Outlook, and Apple Mail with custom photos, social badges, and 1-click rich text copy.

Freehand vector sketching studio. Draw smooth strokes with Bezier curve fitting, convert doodles to clean SVG paths, and export transparent PNGs.

Hand-drawn sketchy whiteboard for architectural wireframes, decision flowcharts, rough diagrams, and sticky note brain-dumps with SVG and PNG export.

Create personalized greeting cards and invitations for birthdays, weddings, holidays, and thank-you notes with handwritten signature layer and PDF export.

Generate high-converting hooks, add invisible spaces for clean line breaks on Instagram and Threads, and convert text to Unicode bold/italic styles with live character limit meters.

Create beautiful event countdowns and daily habit streak milestone cards (100 Days of Code, Fitness, Habit tracking) for WhatsApp Status and Instagram Stories.

Fair random giveaway and contest winner picker with duplicate filtering, weighted entries, celebratory confetti, and verified downloadable certificates.

Multi-criteria weighted scoring decision matrix and strategic SWOT analysis tool. Evaluate vendor options and business strategies with PDF export.

Interactive visual Gantt chart and sprint roadmap planner. Track task progress, milestone dependencies, and project dates with SVG/PNG/CSV export.