10 New Free Tools for Online Sellers, Creators & Developers (2026)
Big update! Over the past weeks we've shipped ten brand-new tools on ConverterDev — and like everything else on this site, they're 100% free, need no signup, and run right in your browser so your data never leaves your device.
Whether you sell on Amazon or Flipkart, run a YouTube channel, or build websites, there's something here for you. Here's the full tour, grouped by what you do.
🛒 For Online Sellers & Small Businesses
Our biggest focus this update. Together with the original GST Tool for Online Sellers, these seven tools now form a complete free toolkit for Indian e-commerce sellers.
1. GST Rate Finder with HSN Codes
Not sure whether your product attracts 5% or 18% GST? Search any of 180+ products and services by name or HSN code and instantly get the rate, updated for the new GST 2.0 slab structure (5% / 18%, effective September 2025). You can also browse by category, filter by rate slab, and even calculate the GST amount on any price with the built-in calculator.
Perfect companion to our GSTR-1 tool when you're filling in HSN summaries.
2. Online Seller Profit Calculator
Open the Seller Profit Calculator →
The question every seller must answer before listing: "what do I actually make per order?" Pick a platform template — Amazon, Flipkart, Meesho, Myntra, JioMart, eBay, Walmart, Etsy or Shopify — and the typical referral, closing, shipping and collection fees load automatically (every field stays editable). Add your product cost, packaging and ad spend, and see your settlement amount, net profit, margin % and ROI instantly.
Indian sellers can even enable GST mode to account for output tax and input tax credit on marketplace fees.
3. Marketplace Fee Comparison
Open the Fee Comparison Tool →
Deciding where to sell? Enter one selling price and see every platform's fees side by side, ranked cheapest first — with a visual breakdown of how much the marketplace takes versus what you receive. The price-ladder table shows how the ranking flips as your price changes: fixed fees crush cheap products, while commission dominates expensive ones.
Use it together with the profit calculator to go from "which platform?" to "at what price?".
4. Invoice & Bill Generator (with Your Logo)
Create professional GST tax invoices, bills, estimates and quotations with a live preview — upload your own logo, add GSTIN and HSN codes, choose CGST+SGST or IGST, and download a clean A4 PDF with the amount in words. No watermark, no invoice limits, and your business details are remembered in your browser so you only type them once.
If you're unsure of an item's GST rate, look it up in the GST Rate Finder first.
5. Amazon Unicode Generator
Open the Amazon Unicode Generator →
Amazon doesn't allow HTML formatting in bullet points — so sellers use Unicode. Type your text once and copy it in 9 styles (𝗕𝗼𝗹𝗱, 𝘪𝘵𝘢𝘭𝘪𝘤, monospace, circled and more), plus a click-to-copy library of 70+ seller symbols: ✓ checkmarks, ➤ arrows, ★ stars, ™ ® and currency signs.
The tool also tells you honestly when not to use them — styled words aren't matched by customer searches, so keep your keywords plain.
6. WhatsApp Chat Link Generator
Open the WhatsApp Link Generator →
Turn your WhatsApp number into a click-to-chat wa.me link with a pre-filled message, a scan-to-chat QR code for packaging and visiting cards, and a ready-made HTML chat button for your website. Customers reach you in one tap — no contact saving needed. Works with WhatsApp Business too.
🎬 For Creators
7. YouTube Thumbnail Downloader & Resizer
Open the Thumbnail Downloader →
Paste any YouTube or Shorts link and grab the thumbnail in every size YouTube stores — up to 1280×720 full HD. Then use the built-in resizer to convert it for Instagram posts and stories, X/Twitter or Facebook, with crop, fit or stretch modes and JPG/PNG/WebP export. All resizing happens locally in your browser.
It joins our existing OpeninApp for YouTube tool in the YouTube section.
🧑💻 For Developers & Website Owners
8. Favicon Generator
Turn any image — or even just a letter or emoji — into a complete favicon package: a proper multi-size favicon.ico, all seven PNG sizes (16×16 to 512×512, including apple-touch-icon and Android/PWA icons), a site.webmanifest, and the exact HTML snippet for your . Everything comes in one ZIP, generated entirely in your browser.
9. Robots.txt & Sitemap Generator
Open the Robots.txt & Sitemap Generator →
Two files control how search engines see your site — get both right in one place. Build a correct robots.txt with quick-add disallow paths and one-click blocking of 9 AI training crawlers (GPTBot, CCBot, PerplexityBot and more) without touching your normal Google indexing. Then generate a valid XML sitemap from a simple list of pages, with lastmod, changefreq and priority options.
Pair it with the Favicon Generator and you've covered the boring-but-critical parts of every website launch.
10. GST Rate Finder — for Developers Too
Building an Indian e-commerce or billing app? The GST Rate Finder doubles as a quick reference for HSN codes and slab rates while you code — faster than digging through CBIC notification PDFs.
The Complete Seller Workflow
These tools are designed to work together. A typical month for an online seller now looks like this:
Every step free, private, and signup-free.
Why Everything Runs in Your Browser
All ten tools follow the same principle as the rest of ConverterDev: your data stays on your device. Invoices, profit numbers, phone numbers, logos, thumbnails — none of it touches our servers. That's not a marketing line; open your browser's network tab and check.
Try Them All
Head to our All Tools page to see the full collection — file converters, compressors, developer utilities and now a complete business toolkit. Have an idea for a tool we should build next? Contact us — several of the tools above came directly from user requests.