Every time I needed to calculate a reverse GST percentage, format a nested JSON payload, or merge two PDF invoices, I found myself facing the same frustrating experience:
- Slow server roundtrips for basic calculations.
- Aggressive popup ads and fake "Download" buttons.
- Privacy concerns: why should an online server receive my financial numbers or confidential PDF documents?
To solve this, I built EverydayTools — a suite of 50 fast, free web utilities designed to run 100% client-side in the browser.
🛠️ The Architecture: Pure Browser-Native Execution
Most online utility sites run on heavy server-side backends (PHP, Python, or serverless functions). While this works, it adds latency and creates privacy risks.
For EverydayTools, every single operation is performed locally on the client:
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In-Browser File Processing:
- PDF merging, page rotation, and extraction are powered entirely in the browser using
pdf-liband Web Workers. Your files are never uploaded to any remote server. - Image compression and cropping use the HTML5 Canvas API and WebAssembly without external API calls.
- PDF merging, page rotation, and extraction are powered entirely in the browser using
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Instant Math & Lookup Tables:
- Financial tools like the GST Calculator, EMI Calculator, and Salary In-Hand Calculator recalculate on every keystroke with zero UI lag.
- We included interactive lookup matrices (e.g. 18% GST quick-reference tables) for instant answers.
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Offline-Ready PWA:
- Built with React 18, TypeScript, and Vite, with a lightweight service worker. You can install the web app on iOS Safari, Android Chrome, or macOS Desktop and perform calculations offline.
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Favorites Shelf & Local Calculation History:
- Instead of navigating through menus, users can star their daily tools to create a personalized top shelf.
- Calculations are stored in
localStorageso you can retrieve your recent figures with 1-click copy without creating an account.
📦 What's Included in the 50-Tool Suite?
The 50 tools are categorized into practical workspaces:
- Finance & Tax: GST (Add & Reverse GST with CGST/SGST split), Salary Take-Home, EMI, SIP, Inflation, and FD calculators.
- Developer Utilities: Regex Tester, JSON Formatter & Validator, Base64 Encoder/Decoder, Hash Generator (SHA-256, MD5), UUID Generator, and Markdown Editor.
- PDF & Image Suite: PDF Merge, PDF Split, Image Compressor, Image Resizer, and Image-to-PDF converter.
- Unit & Base Converters: Metric to Imperial, Temperature, Weight, Data Storage, Base converter (Binary/Hex/Octal), and Roman Numerals.
🚀 Check It Out & Share Feedback
The site is completely free with zero signups required:
👉 EverydayTools
I’d love to hear feedback from fellow developers:
- What daily web tools are you constantly bookmarking or missing?
- What other client-side utilities would you find helpful?
Drop your thoughts in the comments below! 🙌
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