Name: Toolpad.in
Rating: 5.0 (1 reviews)

Toolpad — 25+ free browser-based developer tools. No signup. No limits. Fake data generators that actually validate — Luhn-valid credit cards, MOD-97 IBANs, real-TAC IMEIs. JSON & XML formatter, minifier, validator. JSON↔XML, JSON↔CSV, Base64, Hex converters. Everything runs client-side — your data never leaves the browser. Free REST API included, no key required.

Wispr Flow: Dictation That Works Everywhere — Stop typing. Start speaking. 4x faster.

Stop typing. Start speaking. 4x faster.

Hey Product Hunt! I'm Harsh, and I built Toolpad — this is my first real product launch, so bear with me. Here's the honest story of why this exists: I was building a side project and spent an embarrassing amount of time just setting up test data. I needed fake credit card numbers to test a payment flow, fake addresses for a form, and a quick way to convert some JSON — and I ended up with six different browser tabs open, each from a different site, half of them showing ads every 3 seconds or asking me to sign up for the "free" plan. I thought — this is a solved problem. Why is it this painful? So I built Toolpad.in from scratch. 𝗪𝗵𝗼 𝘁𝗵𝗶𝘀 𝗶𝘀 𝗳𝗼𝗿: → Developers who need realistic test data fast → QA engineers testing payment forms, telecom systems, address validation → Backend devs who live in JSON and XML all day → Anyone who's bookmarked 10 random utility sites and hates it 𝗪𝗵𝗮𝘁 𝗜 𝗯𝘂𝗶𝗹𝘁: I didn't use any data generation libraries. Every algorithm is written from scratch — the Luhn checksum for credit cards, the MOD-97 formula for IBANs, real TAC prefix tables for IMEI numbers pulled from actual manufacturer data. The output isn't just random strings — it's structurally correct data that passes real validation checks. The whole frontend is plain HTML, CSS, and vanilla JS — no framework. Everything runs in your browser. Your data never touches a server. I also built a REST API on top of the same core library, with no API key required, because I kept wishing tools like this had one. 𝗪𝗵𝗮𝘁'𝘀 𝗵𝗼𝗻𝗲𝘀𝘁𝗹𝘆 𝗺𝗶𝘀𝘀𝗶𝗻𝗴: This is a v1. I know there are tools missing, edge cases I haven't handled, and things that could be better. That's exactly why I'm here — I want real feedback from people who actually use developer tools every day. If you try it and something feels off, or there's a tool you wish existed — please tell me in the comments. I'm actively building and every piece of feedback shapes what gets added next. Thank you for checking it out. 🔗 toolpad.in

The honest story behind Toolpad

I was building a side project and needed some test credit card numbers. Googled it, landed on a sketchy site with 14 ads. Needed fake addresses too different site, different UI, another set of ads. JSON formatting? Another tab.

The honest story behind Toolpad

Privacy-first design (biggest differentiator)
Runs everything locally in one browser.
Makes trustworthy while working with sensitive data.
Zero friction usage.
Speed & Performance
Clean focused tool & free to access

Should implement saved / recent history.
Themes customisation.
Extension with stronger SEO.

Traditional online tools like; JSON format, Rapid API tool
Local tool/IDE plugins
Low code builder

Privacy-first design (biggest differentiator)
Runs everything locally in one browser.
Makes trustworthy while working with sensitive data.
Zero friction usage.
Speed & Performance
Clean focused tool & free to access

Should implement saved / recent history.
Themes customisation.
Extension with stronger SEO.

Traditional online tools like; JSON format, Rapid API tool
Local tool/IDE plugins
Low code builder

Wispr Flow: Dictation That Works Everywhere — Stop typing. Start speaking. 4x faster.

Stop typing. Start speaking. 4x faster.

Toolpad.in

The dev toolkit you've been bookmarking 10 sites for.

The dev toolkit you've been bookmarking 10 sites for.

Forum Threads

I spent 20 minutes setting up test data before writing a single line of code. So I built Toolpad.

Forum Threads

I spent 20 minutes setting up test data before writing a single line of code. So I built Toolpad.

What's great

What needs improvement

vs Alternatives

What's great

What needs improvement

vs Alternatives