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TAPAS MAHATA
TAPAS MAHATA

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I Built 93+ Free Browser-Based Tools for Developers — No Signup, No Upload

#webdev #javascript #php #tools

I Built 93+ Free Browser-Based Tools for Developers — No Signup, No Upload

I'm a teacher and self-taught web developer from India. Over the past few months, I built TSM Tools — a completely free, browser-based toolkit with 93+ tools for developers, SEO professionals, and students.

No backend. No database. No signup. Everything runs 100% in your browser — your files and data never leave your device.

Here's what I built and why.

🤔 Why I Built This

I was tired of switching between 10 different websites just to:

  • Format a JSON response
  • Check keyword density of a blog post
  • Generate a QR code
  • Calculate an EMI
  • Decode a JWT token

Most of these tools either require signup, show aggressive ads, or upload your files to their server. I wanted something fast, private, and free — so I built it myself.

🛠 What's Inside

Developer Tools (24 tools)

  • JSON Formatter & Validator — beautify or minify JSON instantly
  • JS / CSS / HTML Formatter — format messy code in one click
  • JS / CSS Minifier — reduce file size for production
  • JWT Decoder — inspect tokens without any library
  • .htaccess Generator — build Apache redirect rules visually
  • Cron Expression Builder — create cron schedules with plain-English preview
  • Base Converter — Binary ↔ Decimal ↔ Hex ↔ Octal
  • SQL Formatter — format raw SQL queries
  • Regex Tester — test regular expressions with live matches
  • And more...

🔄 Converters (26 tools)

  • Excel Viewer — open .xlsx, .xls, .ods with multi-sheet support
  • Excel → JSON / CSV / HTML — export spreadsheet data instantly
  • CSV → Excel / JSON → Excel — download as .xlsx in one click
  • JSON ↔ CSV ↔ XML — convert data formats instantly
  • Image Compressor — reduce file size with quality slider
  • Image Resizer — custom dimensions with aspect ratio lock
  • Format Converter — PNG ↔ JPEG ↔ WebP
  • PDF to HTML — each page rendered as image, exact visual copy
  • Word to HTML — convert .docx to HTML markup
  • Markdown ↔ HTML — live preview conversion
  • Text ↔ Binary / Hex / Morse Code — encode and decode instantly

⚡ Utilities (21 tools)

  • EMI Calculator — home, car, personal loans with tenure quick-select
  • BMI Calculator — metric and imperial with health range
  • Age Calculator — exact age with next birthday countdown
  • QR Code Generator — URL, text, contact info
  • Invoice Generator — create and print professional invoices
  • Unit Converter — length, weight, temperature, speed, area, data
  • Password Generator — with strength indicator
  • IP Address Lookup — detect your current IP instantly
  • Color Picker — HEX, RGB, HSL values
  • Word Counter — characters, sentences, reading time

📈 SEO Tools (21 tools)

  • SERP Preview — see how your page looks in Google search
  • Keyword Density Checker — analyze keyword usage
  • Meta Tag Generator — create optimized title and description
  • Sitemap Generator — create XML sitemaps for Google Search Console
  • Schema Markup Generator — JSON-LD structured data
  • Twitter Card Preview — see how links look when shared
  • HTTP Header Checker — inspect response headers
  • Core Web Vitals Guide — LCP, FID, CLS explained

🔬 PHP/JS/HTML Health Checker

This is the tool I'm most proud of. Upload a ZIP file of your PHP, JavaScript, or HTML project and get:

  • SQL injection vulnerability detection
  • XSS vulnerability scanning
  • JavaScript syntax checking
  • Security best practice analysis
  • Auto-fix suggestions

All scanning happens in your browser using JavaScript — your code is never uploaded to any server.

🏗 How I Built It

Everything is vanilla HTML, CSS, and JavaScript — no frameworks, no build tools.

Key libraries used:

What I learned:

  • Browser APIs are incredibly powerful — File API, Canvas API, Blob API, URL.createObjectURL()
  • You can do a lot without a backend if you design around client-side processing
  • Keeping everything in one HTML file per page makes deployment trivially simple

📊 The Numbers

Category Tools
Dev Tools 24
Converters 26
Utils 21
SEO Tools 21
Health Checker 1
Total 93+
Blog Articles 24

🚀 What's Next

  • More Excel tools (pivot table viewer, formula helper)
  • More SEO tools (backlink checker, page speed analyzer)
  • Dark mode
  • Mobile app (PWA)

🔗 Try It

👉 https://tsmtools.in

All tools are free, forever. No signup. No upload. No tracking beyond basic analytics.

I'd love to hear your feedback — what tools do you use most? What's missing? Drop a comment below! 👇

Built with ❤️ by a teacher who codes.

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