RoundupImages
Best Free Image Converter and Compression Tools
The best free browser image tools for compress, HEIC, WebP, SVG, PNG, and JPG - no upload and no account.
5 min read
DevOkk Blog
Guides that send you to the right tool
How-to articles, category roundups, and fair competitor comparisons for browser-based, privacy-first utilities. Files stay on your device unless a network lookup is the actual job.
RoundupPDF
Best Free PDF Tools Online That Do Not Upload Your Files
A map of DevOkk’s free PDF tools that run in the browser: compress, split, merge, convert. No account.
6 min read
RoundupSecurity
Best Free Security and Encoding Tools
Decode JWTs, hash files, generate passwords, and strip metadata locally. Security utilities that keep tokens and passwords on your device.
6 min read
RoundupJSON & Data
Best JSON Tools for Developers
Format, view, minify, and graph JSON in the browser. A privacy-first toolkit for API debugging without pasting secrets to a site.
5 min read
RoundupScience
Best Scientific Calculators for Chemistry and Physics
Molarity, pH, gas law, force, and energy calculators for lab and class. Run the math in your browser with worked examples.
5 min read
RoundupUnits
Best Unit Converters for Students and Engineers
Length, temperature, bytes, Unix time, pressure, and more - fast unit converters that work offline in your browser.
5 min read
RoundupCSS & Frontend
Best CSS and Frontend Design Tools
Color palettes, CSS animation previews, favicons, patterns, bundle size, and screen-reader checks - all in the browser.
4 min read
RoundupSEO
Best Free SEO Preview Tools
Audit meta tags, Open Graph, and SERP snippets before you ship. Free SEO preview tools with no login.
4 min read
RoundupBusiness
Best Free Business Tools for Freelancers
Resume, invoice, QR, barcode, and profile card tools that keep client and personal data on your device.
6 min read
RoundupNetworking
Best Free Networking Diagnostic Tools
DNS, SSL, ping, headers, and IP lookups for debugging. Clear notes on what must leave your browser to query the public internet.
6 min read