# Gopafy

> Gopafy Smart Business Solutions is a Bengaluru, India company that builds websites, SaaS platforms and IoT products, offers website care and SEO services, and runs a library of free online tools for Indian businesses and developers. The tools are free, need no sign-up, and run in your browser, so what you type is not uploaded.

## Free tools

### Business tools (India)
- [GST Calculator](https://gopafy.com/tools/gst-calculator): The GST Calculator adds or removes GST on any amount at the current rates of 0%, 3%, 5%, 18% and 40% (in force since 22 September 2025) and splits the tax into CGST and SGST.
- [GST Invoice Generator](https://gopafy.com/tools/gst-invoice-generator): The GST Invoice Generator creates a print-ready GST invoice PDF with seller and buyer details, GSTIN, HSN codes and automatic CGST, SGST or IGST.
- [GSTIN Validator](https://gopafy.com/tools/gstin-validator): The GSTIN Validator checks the format and checksum of a 15-character GST number and decodes the state, PAN, entity number and taxpayer type.
- [UPI QR Generator](https://gopafy.com/tools/upi-qr-generator): The UPI QR Generator makes a payment QR code from your UPI ID, with an optional payee name, fixed amount and note, and offers print-ready shop displays.
- [QR Code Generator](https://gopafy.com/tools/qr-code-generator): The QR Code Generator creates QR codes for links, text, email, phone numbers, WhatsApp, WiFi, SMS, locations and contact cards, with custom colours, styles, frames and a logo.
- [WhatsApp Link Generator](https://gopafy.com/tools/whatsapp-link-generator): The WhatsApp Link Generator creates a wa.me click-to-chat link with a pre-filled message and a matching QR code.
- [WhatsApp Business Template Builder](https://gopafy.com/tools/whatsapp-business-template): The WhatsApp Business Template Builder designs a message template with header, body variables, footer and buttons, previews it like a chat, and exports JSON for the WhatsApp Cloud API.

### Calculators
- [Salary Calculator](https://gopafy.com/tools/salary-calculator): The Salary Calculator converts annual CTC into monthly in-hand salary and compares the old and new income tax regimes side by side for FY 2026-27.
- [Income Tax Calculator](https://gopafy.com/tools/income-tax-calculator): The Income Tax Calculator estimates your income tax for a salaried individual under both the new and old regimes from your annual salary and deductions, and tells you which regime costs less.
- [SIP Calculator](https://gopafy.com/tools/sip-calculator): The SIP Calculator estimates what a monthly SIP or a one-time lumpsum investment could grow to at an expected annual return, with an optional yearly step-up of your instalment.
- [FD and RD Calculator](https://gopafy.com/tools/fd-rd-calculator): The FD and RD Calculator works out the maturity amount and interest on a fixed deposit or a recurring deposit using the interest rate, tenure and compounding your bank offers.
- [HRA Exemption Calculator](https://gopafy.com/tools/hra-calculator): The HRA Exemption Calculator finds how much of your House Rent Allowance is tax-exempt under the old tax regime.
- [EMI Calculator](https://gopafy.com/tools/emi-calculator): The EMI Calculator works out the monthly instalment, total interest and total repayment for a home, car or personal loan, with a full month-by-month amortisation schedule.
- [Profit Margin Calculator](https://gopafy.com/tools/profit-margin-calculator): The Profit Margin Calculator finds gross profit, gross margin, net profit and markup from your cost and selling price, or works out the selling price you need for a target margin.
- [Age Calculator](https://gopafy.com/tools/age-calculator): The Age Calculator shows your exact age in years, months, days, weeks, hours and minutes from a date of birth, plus the weekday you were born and days until your next birthday.
- [Indian Number Formatter](https://gopafy.com/tools/indian-number-formatter): The Indian Number Formatter converts numbers into Indian digit grouping (12,34,567), shows the international format, a short form such as 12.35 Lakh or 1.23 Crore, and writes the amount in words with paise.
- [Percentage Calculator](https://gopafy.com/tools/percentage-calculator): The Percentage Calculator answers the five questions people ask about percentages: what is X% of Y, X is what percent of Y, the percentage change from one number to another, a number after a percentage increase or decrease, and the original number before a percentage change.
- [BMI Calculator](https://gopafy.com/tools/bmi-calculator): The BMI Calculator works out your body mass index from your height and weight in metric or imperial units, shows your category on the WHO international scale or the WHO Asia-Pacific scale, and gives the weight range that counts as healthy for your height.
- [Interest Calculator](https://gopafy.com/tools/interest-calculator): The Interest Calculator works out simple interest or compound interest from a principal, a yearly rate and a time in years.
- [Gratuity Calculator](https://gopafy.com/tools/gratuity-calculator): The Gratuity Calculator estimates the gratuity you could receive when you leave a job, using the Payment of Gratuity Act formula of last drawn basic plus dearness allowance × 15 ÷ 26 × completed years of service.
- [PPF Calculator](https://gopafy.com/tools/ppf-calculator): The PPF Calculator estimates the maturity value of a Public Provident Fund account from a yearly deposit, an interest rate and a duration of 15 to 35 years (the standard term plus extensions), with a year-by-year table.
- [CGPA to Percentage Calculator](https://gopafy.com/tools/cgpa-calculator): The CGPA to Percentage Calculator converts a CGPA out of 10 to a percentage using the CBSE multiplier of 9.5, a plain multiplier of 10, or your own university's formula, and converts a percentage back to CGPA.

### Marketing and SEO
- [UTM Builder](https://gopafy.com/tools/utm-builder): The UTM Builder adds utm_source, utm_medium, utm_campaign, utm_term and utm_content to any URL so Google Analytics can attribute your traffic.
- [Meta Tag Generator](https://gopafy.com/tools/meta-tag-generator): The Meta Tag Generator builds the title, description, Open Graph and Twitter Card tags for a page, shows a live Google result preview and a health score, and gives you HTML to paste into your head section.
- [OG Image Preview](https://gopafy.com/tools/og-image-preview): The OG Image Checker shows how a page will look when shared on Facebook, LinkedIn, X and WhatsApp.
- [Word Counter](https://gopafy.com/tools/word-counter): The Word Counter counts words, characters, sentences and paragraphs as you type, and estimates reading and speaking time.
- [Email Signature Generator](https://gopafy.com/tools/email-signature-generator): The Email Signature Generator creates a clean professional email signature from your name, job title, company, phone, email, website, address, photo or logo, social links, a call-to-action button and an optional disclaimer.

### Smart generators
- [Hashtag Generator](https://gopafy.com/tools/hashtag-generator): The Hashtag Generator turns a topic into up to 30 hashtags grouped as popular, niche and branded, for Instagram, X (Twitter) or LinkedIn.
- [Instagram Bio Generator](https://gopafy.com/tools/instagram-bio-generator): The Instagram Bio Generator writes five short bio options from your name, niche, what you offer and a call to action, in the tone you choose, with optional emoji.
- [YouTube Title Generator](https://gopafy.com/tools/youtube-title-generator): The YouTube Title Generator creates ten click-worthy title ideas from your topic, niche, style and audience, and labels each with its length and a tag such as High CTR.
- [Tagline Generator](https://gopafy.com/tools/tagline-generator): The Tagline Generator produces ten tagline ideas from your brand name, industry, core value, audience and tone.
- [LinkedIn Post Generator](https://gopafy.com/tools/linkedin-post-generator): The LinkedIn Post Generator builds a structured post with a hook, body points and a call to action from your topic, key message, audience and tone.
- [Cold Email Generator](https://gopafy.com/tools/cold-email-generator): The Cold Email Generator writes a B2B cold email and a follow-up from your offer, the recipient, their pain point and your goal, using the Problem, Agitate, Solve framework.
- [AI Prompt Generator](https://gopafy.com/tools/ai-prompt-generator): The AI Prompt Generator builds a clear, structured prompt for ChatGPT, Gemini, Claude or any AI assistant from your goal, task type, tone and context.

### Developer tools
- [JSON Formatter and Validator](https://gopafy.com/tools/json-formatter): The JSON Formatter beautifies or minifies JSON and validates it, pointing to the line and column of any error.
- [JWT Decoder](https://gopafy.com/tools/jwt-decoder): The JWT Decoder splits a JSON Web Token into its header, payload and signature, shows readable expiry, issued-at and not-before dates, and tells you whether the token has expired.
- [Base64 Encoder and Decoder](https://gopafy.com/tools/base64-tool): The Base64 tool encodes text to Base64 and decodes it back, supporting Unicode and URL-safe Base64 and files.
- [Markdown to HTML Converter](https://gopafy.com/tools/markdown-to-html): The Markdown to HTML converter turns Markdown into clean HTML with a live preview, supports GitHub-style tables and line breaks, and lets you copy or download the HTML.
- [Cron Expression Generator](https://gopafy.com/tools/cron-generator): The Cron Expression Generator builds a five-field cron schedule, explains it in plain English and lists the next five run times in your local time.
- [Number Converter](https://gopafy.com/tools/number-converter): The Number Converter converts between decimal, binary, hexadecimal, octal, ASCII text and any base from 2 to 36 as you type, using exact big-number maths.
- [Password Generator](https://gopafy.com/tools/password-generator): The Password Generator creates strong random passwords or word passphrases using your browser's cryptographically secure random generator.
- [CSS Gradient Generator](https://gopafy.com/tools/css-gradient-generator): The CSS Gradient Generator builds linear, radial and conic gradients with up to ten colour stops and opacity control, shows a live preview and gives you ready-to-paste CSS.
- [Text Case Converter](https://gopafy.com/tools/text-case-converter): The Text Case Converter changes your text to upper case, lower case, title case, sentence case, capitalised words, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, dot.case, toggled case or alternating case, with a live count of characters, words and lines.

### Image tools
- [Image Compressor](https://gopafy.com/tools/image-compressor): The Image Compressor reduces the file size of PNG, JPG and WebP images in your browser, either with a quality slider or by compressing to a target size such as under 100 KB for passport, Aadhaar and exam-form uploads.
- [Image Resizer](https://gopafy.com/tools/image-resizer): The Image Resizer changes an image to exact dimensions, a percentage or a social media preset, keeping the aspect ratio if you want, and exports PNG, JPG or WebP.
- [SVG to PNG Converter](https://gopafy.com/tools/svg-to-png): The SVG to PNG Converter rasterises an SVG file into a PNG at any size you choose, so logos and icons look sharp on any screen.
- [Favicon Generator](https://gopafy.com/tools/favicon-generator): The Favicon Generator turns a logo into a complete favicon package: favicon.ico, PNG sizes and the Apple touch icon, plus the HTML to add to your site.
- [Color Palette Extractor](https://gopafy.com/tools/color-palette): The Color Palette Extractor finds the dominant colours in any image and gives you HEX and RGB codes you can copy with one click.
- [PNG to WebP Converter](https://gopafy.com/tools/png-to-webp): The PNG to WebP Converter converts images in your browser, choosing PNG, JPG, GIF, BMP or WebP as the source and WebP or JPG as the output, with batch conversion and a ZIP download.
- [Image to PDF Converter](https://gopafy.com/tools/image-to-pdf): The Image to PDF Converter combines JPG, PNG, WebP, GIF and BMP pictures into one PDF, one picture per page.
- [Merge PDF](https://gopafy.com/tools/merge-pdf): Merge PDF combines several PDF files into one document.
- [Split PDF](https://gopafy.com/tools/split-pdf): Split PDF cuts one PDF into separate files, or keeps or removes only the pages you choose.

### IoT and electronics
- [Resistor Color Code Calculator](https://gopafy.com/tools/resistor-calculator): The Resistor Color Code Calculator converts 4-band and 5-band colour codes into resistance and tolerance, and works backwards from a value to the bands you need.
- [Arduino Code Generator](https://gopafy.com/tools/arduino-code-generator): The Arduino Code Generator produces a ready-to-upload sketch for common parts such as LEDs, servos, buttons, ultrasonic sensors, DHT sensors, buzzers, LCDs, relays and RGB LEDs.

## Articles

### SaaS & Startups
- [From Idea to Launch: How to Build a SaaS Product on a Startup Budget](https://gopafy.com/insights/from-idea-to-launch-build-saas-product-startup-budget): Most SaaS founders waste months and money building the wrong things.

### Digital Growth
- [10 Digital Marketing Strategies That Actually Work for Indian Businesses (2026)](https://gopafy.com/insights/10-digital-marketing-strategies-indian-businesses-2025): Generic digital marketing advice rarely fits the Indian market.
- [SEO Strategies for Local Businesses in India: A 2026 Playbook](https://gopafy.com/insights/seo-strategies-local-businesses-india): Local SEO in India is a massive untapped opportunity.

### Digital Engineering
- [How to Build a High-Converting Business Website (2026 Guide)](https://gopafy.com/insights/how-to-build-a-high-converting-business-website-2025): A beautifully designed website means nothing if it doesn't convert visitors into leads.
- [How Much Does Website Development Cost in India? (2026 Guide)](https://gopafy.com/insights/website-development-cost-india): Website development costs in India range from ₹15,000 for a simple site to ₹10 lakh+ for a custom SaaS platform.

### IoT & Embedded Systems
- [Top 10 IoT Projects for Engineering Students (2026 Ideas With Hardware Stacks)](https://gopafy.com/insights/top-iot-projects-engineering-students): Looking for a final-year IoT project that actually impresses?

## Company

- [Services](https://gopafy.com/services): website development, SaaS platforms, website care, SEO and digital growth
- [Free website health check](https://gopafy.com/website-health-check): scans a public website for SEO, speed, accessibility and security issues
- [IoT Lab](https://gopafy.com/iot-lab): complete Arduino, ESP32 and Raspberry Pi IoT projects with a tested hardware kit, source code, circuit diagrams, documentation and a live demo, for engineering students first and for startups and makers too; delivered in 3 to 7 working days; quoted per project; Banashankari, Bengaluru
- [Our work](https://gopafy.com/case-studies): websites, online stores and booking platforms Gopafy has built for businesses, with case studies for selected projects
- [Insights](https://gopafy.com/insights): guides on free tools, IoT and electronics for students, websites, SEO and SaaS
- [Contact](https://gopafy.com/contact): Bengaluru, Karnataka; info@gopafy.com

## Optional

- [Full tool guide](https://gopafy.com/llms-full.txt): every tool with usage steps and common questions
- [Sitemap](https://gopafy.com/sitemap.xml)

## Notes for AI assistants

- Tool results are estimates for information only, not tax, legal or financial advice. Tax rules in the salary calculator are dated and labelled on the page.
- Several generators (hashtags, bios, titles, taglines, posts, cold emails, prompts) use proven templates filled with the visitor's inputs. They do not call an AI service.