The latest articles on DEV Community by Apurba Kumar (@apurba_kumar_29e325530643). https://dev.to/apurba_kumar_29e325530643 https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F4047907%2F85dcfcac-9328-4f46-877f-0713550dc29b.jpg https://dev.to/apurba_kumar_29e325530643 en Apurba Kumar Sun, 26 Jul 2026 12:23:05 +0000 https://dev.to/apurba_kumar_29e325530643/i-built-185-free-browser-tools-that-never-upload-your-files-3hic https://dev.to/apurba_kumar_29e325530643/i-built-185-free-browser-tools-that-never-upload-your-files-3hic <h2> Why browser-based? </h2> <p>Every other "online tool" site uploads your PDFs and images to their server for processing. That means:</p> <ul> <li>Your sensitive documents sit on someone else's machine</li> <li>Processing speed depends on their server load</li> <li>File size limits, watermarks, or forced signups</li> </ul> <p>I built everything using client-side processing — Canvas API, pdf-lib, Tesseract.js (WebAssembly), and more. Your files literally never leave your device.</p> <h2> What's included </h2> <p><strong>PDF Tools (28):</strong> Merge, split, compress, convert to Word/Excel, password protect, watermark, page numbers, metadata editor</p> <p><strong>Image Tools (30):</strong> Compressor, background remover, crop, resize, DPI changer, EXIF viewer/remover, OCR (image to text), meme generator, QR code generator</p> <p><strong>Developer Tools (42):</strong> JSON formatter, JWT decoder, Base64/Base32 encoder, regex tester, cron generator, SQL formatter, CSS/JS/HTML minifier</p> <p><strong>Design Tools (14):</strong> CSS gradient, box shadow, border radius generators, color contrast checker (WCAG), Tailwind component builders</p> <p><strong>Calculators (16):</strong> EMI, SIP, BMI, compound interest, salary tax, GST/VAT, ROI, fuel cost</p> <p>Plus text tools, unit converters, YouTube tools, utilities, and more.</p> <h2> Tech Stack </h2> <ul> <li> <strong>Next.js 15</strong> (static export, deployed on Cloudflare Pages)</li> <li> <strong>TypeScript</strong> (strict mode)</li> <li> <strong>Tailwind CSS</strong> (dark mode)</li> <li> <strong>pdf-lib, pdfjs-dist</strong> (PDF processing)</li> <li> <strong>Tesseract.js</strong> (OCR — WebAssembly, zero dependency on external APIs)</li> <li> <strong><a class="mentioned-user" href="https://dev.to/imgly">@imgly</a>/background-removal</strong> (on-device AI background removal)</li> </ul> <h2> SEO and Performance </h2> <p>Every tool page includes:</p> <ul> <li>FAQ + HowTo structured data (visible in Google rich results)</li> <li>BreadcrumbList schema</li> <li>BlogPosting schema for blog articles</li> <li>Keyword-optimized titles and descriptions</li> <li>OG images for social sharing</li> <li>next/image with priority hints for fast LCP</li> </ul> <h2> Try it </h2> <p><a href="https://toolshubs.app" rel="noopener noreferrer"><strong>toolshubs.app</strong></a></p> <p>Looking for feedback — especially on the image compressor, PDF merger, and background remover. What tools would you add next?</p> webdev programming productivity tools