Privacy-first browser tools bundle: JSON, encoding, converters, and utilities run client-side

A week ago, I challenged myself to build a collection of free online tools from scratch. Today, I'm excited to share the first version of ToolEka 🎉 👉 https://tooleka.com The idea wasn't to create another generic calculator website. I wanted to build a platform that is fast, simple, mobile-friendly, and actually useful. 🛠️ Tech Stack Next.js React Tailwind CSS TypeScript Cloudflare Workers Cloudflare R2 I chose Cloudflare Workers because I wanted global performance with minimal infrastructure management. ✨ What's Available Right Now? The first release includes 14+ free tools, including: Health calculators Finance calculators Developer utilities Text tools Every tool is designed to work instantly without requiring an account. 💡 Why I Built It While searching for online tools, I noticed that many websites are: Slow to load Filled with intrusive ads Not optimized for mobile devices Cluttered with unnecessary features I wanted to build something that focused on speed, simplicity, and usability. 🚧 Challenges Along the Way Building the project in one week wasn't easy. Some of the biggest challenges included: Deploying Next.js on Cloudflare Workers Optimizing performance and Core Web Vitals Adding SEO metadata and structured data Making every page responsive Building reusable components for future tools Each challenge helped me learn something new. 🚀 What's Next? This is only the beginning. My roadmap includes: 100+ free online tools AI-powered utilities More developer tools Better accessibility Continuous UI and performance improvements 🙌 I'd Love Your Feedback If you're a developer, designer, or someone who frequently uses online tools, I'd really appreciate your feedback. Some questions I'd love to hear your thoughts on: Is the UI intuitive? Which tools should I add next? Did you notice any bugs or performance issues? What would make you come back and use it again? You can check it out here: 👉 https://tooleka.com I'm building this in public, so every suggestion is valuable. Thanks for reading! ❤️

Why browser-based? Every other "online tool" site uploads your PDFs and images to their server for processing. That means: Your sensitive documents sit on someone else's machine Processing speed depends on their server load File size limits, watermarks, or forced signups I built everything using client-side processing — Canvas API, pdf-lib, Tesseract.js (WebAssembly), and more. Your files literally never leave your device. What's included PDF Tools (28): Merge, split, compress, convert to Word/Excel, password protect, watermark, page numbers, metadata editor Image Tools (30): Compressor, background remover, crop, resize, DPI changer, EXIF viewer/remover, OCR (image to text), meme generator, QR code generator Developer Tools (42): JSON formatter, JWT decoder, Base64/Base32 encoder, regex tester, cron generator, SQL formatter, CSS/JS/HTML minifier Design Tools (14): CSS gradient, box shadow, border radius generators, color contrast checker (WCAG), Tailwind component builders Calculators (16): EMI, SIP, BMI, compound interest, salary tax, GST/VAT, ROI, fuel cost Plus text tools, unit converters, YouTube tools, utilities, and more. Tech Stack Next.js 15 (static export, deployed on Cloudflare Pages) TypeScript (strict mode) Tailwind CSS (dark mode) pdf-lib, pdfjs-dist (PDF processing) Tesseract.js (OCR — WebAssembly, zero dependency on external APIs) @imgly/background-removal (on-device AI background removal) SEO and Performance Every tool page includes: FAQ + HowTo structured data (visible in Google rich results) BreadcrumbList schema BlogPosting schema for blog articles Keyword-optimized titles and descriptions OG images for social sharing next/image with priority hints for fast LCP Try it toolshubs.app Looking for feedback — especially on the image compressor, PDF merger, and background remover. What tools would you add next?

Hello, DEV Community! 👋 How many times a week do you find yourself searching Google for a simple online tool—like a favicon converter, a typing speed tester, or a quick chart generator—only to land on bloated websites filled with intrusive ads and unnecessary server requests? Frustrated by this exact friction, I decided to build my own centralized solution: All in One Utility Hub. The Vision: Fast, Pure, and Distraction-Free The goal behind All in One Utility Hub is simple: create a suite of micro-utilities that load instantly, require zero setup, and operate entirely in the browser. No heavy frameworks bogging down performance, no forced sign-ups, and no server-side bottlenecks. Just pure, functional client-side tools. What's Currently Inside the Hub? Online Favicon Generator:** Quickly convert any image asset into professional multi-size favicon packages. Online Typing Speed Tester:Track and improve your WPM, CPM, and accuracy cleanly. Free Online Graph & Chart Maker:** Generate visual data charts instantly for reports and presentations. Tech Stack & Architecture The entire suite is built using clean, high-performance HTML5, CSS3, and vanilla/modern JavaScript. By keeping everything client-side, execution is instantaneous, and user data remains private right within the browser session. Explore and Share Your Feedback I built this hub to serve as a handy bookmark for developers, designers, and students alike. You can explore the live project here: 👉 All in One Utility Hub I’m constantly expanding the toolkit with new utilities. What kind of micro-tool do you wish existed online? Let me know in the comments below! Happy coding! 🚀

Why I Built This I got frustrated with tools like SmallPDF and ILovePDF uploading my sensitive documents to their servers. I wanted something that works entirely in the browser. So I built Wrklyst — a growing collection of free utility tools that process files locally using WebAssembly. Your files never leave your device. What's Inside PDF tools (merge, compress, convert, sign) Image tools (convert, compress, resize) Writing tools (word counter, grammar checker) Developer tools (JSON, regex, base64) Security tools (password generator, hash) More tools dropping every week Tech Stack Next.js 16 — App Router WebAssembly — browser-side processing Vercel — deployment Supabase — database Tailwind CSS — styling The Privacy Angle Most online tools upload your files to a server. Wrklyst processes everything locally — meaning: No file uploads No account needed No paywalls Always free Still Building This is an early version — still growing and adding new tools regularly. Would love your honest feedback. wrklyst.com What tool do you wish existed? Drop it in the comments!

As developers, we use online tools every day. JSON formatters JWT decoders Base64 encoders Hash generators URL encoders Diff tools And many more. But there's one question we don't always ask: Where does the data we paste into these tools go? Think about the data we work with every day: API responses Configuration files Application logs JWTs and tokens Internal URLs Database records Source code Sometimes, we paste this data into online tools just to perform a simple operation. I wanted a different approach. So I built LocalOnly.dev. What is LocalOnly.dev? LocalOnly.dev is a collection of free developer tools built with a privacy-first approach. The idea is simple: If a task can be done directly in your browser, why send your data to a server? LocalOnly.dev focuses on tools that can process data locally in your browser whenever possible. No account required for the core tools. No unnecessary backend dependency. Just open a tool, do your work, and move on. What can you do? LocalOnly.dev includes tools for: 🧩 JSON formatting and validation 🔍 JSON comparison 🔐 Security and hash utilities 🔄 Encoding and decoding 🌐 URL utilities 📝 Text transformation 🧑‍💻 Developer productivitye And more tools are coming The goal isn't to build another collection of random utilities. It's to build a privacy-first toolbox that developers can actually use every day. Why does this matter? Local processing doesn't make every workflow automatically secure, and developers should always understand what a tool does with their data. But when a task doesn't require a server, I believe we should have the option to keep our data on our own device. That's the idea behind LocalOnly.dev Your data. Your browser. Your control. I'm building LocalOnly.dev in public and would love your feedback. What developer tool do you use every week that you wish had a more privacy-friendly alternative? Try it out and let me know what I should build next: 👉 https://localonly.dev/ Built by a developer, for developers. 🚀

I Built 100+ Browser-Based Tools That Never Upload Your Files Every time I wanted to merge a PDF, compress an image, convert a file, or format JSON, I ran into the same experience: Upload your file Wait for it to process on a remote server Download the result Hope your data is deleted afterward It made me wonder: Why are we uploading files for tasks that modern browsers can often handle locally? That question became the starting point for WhizTools. The Idea Instead of sending files to a backend, I wanted to build tools that run entirely in the browser whenever possible. Today, WhizTools includes 100+ free tools across categories such as: 📄 PDF Tools 🖼️ Image Tools 📝 Text Tools 💻 Developer Tools 🔐 Security & Encoding 🎨 Color & Design 📊 Calculators 📱 QR & Barcode 📋 Productivity Tools 📚 Helpful Guides The goal is simple: Use a tool, get your result instantly, and keep your data on your own device. Why Browser-Based? Modern browsers have become incredibly powerful. Using browser APIs, it's possible to perform many operations locally without needing cloud processing. That means: 🔒 Better privacy ⚡ Faster processing 🌐 Many tools work offline after the site loads 🚫 No account required 📤 No file uploads for supported tools For everyday utilities, this creates a much better experience. Challenges Building everything client-side isn't as simple as it sounds. Some interesting challenges included: Processing large files efficiently Keeping memory usage low Supporting desktop and mobile browsers Implementing OCR that runs locally Optimizing performance for slower devices Every browser behaves a little differently, so testing became a significant part of development. What Surprised Me After launching, I expected people to comment on the number of tools. Instead, the feedback was mostly about privacy. Many users appreciated that they could: Convert PDFs Format JSON Generate QR codes Process images ...without uploading their files or creating an account. That reinforced something I'd been hoping was true: Privacy itself can be a compelling product feature. What's Next I'm continuing to expand WhizTools based on user feedback, improve existing tools, and add more browser-powered utilities. If there's a tool you wish existed, I'd love to hear your ideas. 👉 Project: https://whiztools.app