Who these tools are for
They are built for the jobs that come up every week in a growing business: a founder checking whether ads are profitable, a marketer tagging a Diwali campaign, a clinic or broker adding a WhatsApp button, a developer fixing a noindex tag, or a content team shrinking images before upload. Our team uses the same calculations and checks in client work.
Which tool to use when
| Task | Tool |
|---|---|
| Cost per lead, cost per customer and ROAS from one campaign | CPL, CPA and ROAS calculator |
| Whether a ROAS is profitable, and the minimum ROAS needed | ROAS and break-even calculator |
| Where leads drop out between visit, enquiry, qualification and sale | Lead funnel calculator |
| Margin, markup and gross profit | Profit margin calculator |
| Percentage of a number, growth, GST and discounts | Percentage calculator |
| Campaign links that report correctly in GA4 | UTM builder |
| Click-to-chat links with a prefilled message | WhatsApp link generator |
| Links that open a prefilled email | Email link generator |
| Encoding or decoding %-encoded text | URL encoder and decoder |
| Keeping a page out of search, or limiting snippets | Robots meta tag generator |
| Writing and previewing a title and meta description | Meta tag preview and generator |
| FAQPage JSON-LD structured data | FAQ schema generator |
| Converting JPG or PNG to lighter WebP | Image to WebP converter |
| Resizing and compressing photos | Image resizer and compressor |
| Turning a PNG into a JPG with a background colour | PNG to JPG converter |
Browse by group: marketing and ROI calculators, link and messaging tools, SEO and schema tools and image and media tools.
How the tools work
Every tool runs in your browser — nothing you type or upload is sent to our servers. Calculators update as you type, and generators produce code or links you can copy straight into a page or ad. Each page lists the exact inputs, the formula or syntax, a worked example, and the mistakes that most often produce a wrong result.
When a number raises a bigger question, such as why traffic is not turning into enquiries or how to tie leads to revenue, our guides go deeper: website gets traffic but no leads and marketing attribution and lead tracking in India.
Frequently asked questions
Are the GrowthSparx tools really free?
Yes. All the tools are free to use with no sign-up, no usage limit and no watermark on images. They run in your browser, so the numbers, text and images you enter stay on your device. Each page also explains the formula or syntax, so you can check results or repeat them yourself.
Do the image tools upload my files?
No. The WebP converter, image resizer and PNG to JPG converter process images inside your browser using its built-in canvas features. Your file is not uploaded to a server, which also makes conversion quick. Download the result from the page once you are happy with the preview.
Which tool should I start with to check if my ads are working?
Start with the CPL, CPA and ROAS calculator using one campaign's spend, leads, customers and revenue for the same period. Then enter your margin in the ROAS calculator to see your break-even ROAS. If leads are plentiful but sales are low, use the lead funnel calculator to find the weak stage.
Can I use these tools for client work?
Yes. The calculators and generators are free to use for your own business or for clients. Generated links, tags and schema are yours to publish. Check outputs against each platform's current rules before going live, especially for structured data and ad tracking.