The latest articles on DEV Community by allomni tools (@allomni_tools_45fb0a7e9ef). https://dev.to/allomni_tools_45fb0a7e9ef 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%2F3990255%2Ff675e980-6078-4f0e-a045-88bc88ea3571.png https://dev.to/allomni_tools_45fb0a7e9ef en allomni tools Thu, 18 Jun 2026 06:21:43 +0000 https://dev.to/allomni_tools_45fb0a7e9ef/170-free-browser-based-developer-tools-no-login-no-upload-100-private-1adk https://dev.to/allomni_tools_45fb0a7e9ef/170-free-browser-based-developer-tools-no-login-no-upload-100-private-1adk <p>Hey DEV community! 👋</p> <p>We built <strong>AllOmnitools</strong> because we hated the friction of online tools: signing up, uploading files, dealing with ads, or worrying about privacy.</p> <p>So we created <strong>170+ free online tools</strong> that run <strong>100% in your browser</strong> — no login, no uploads, no tracking.</p> <h2> What We Offer for Developers </h2> <h3> Code &amp; Text Tools </h3> <ul> <li> <strong>Diff Checker</strong> — Side-by-side comparison highlighting additions, deletions, and line differences [源]</li> <li> <strong>JSON Formatter</strong> — Validate and pretty-print JSON</li> <li> <strong>Markdown Preview</strong> — Live Markdown renderer showing HTML output in real-time</li> <li> <strong>Regex Tester</strong> — Test regular expressions instantly</li> <li> <strong>Base64 Encoder/Decoder</strong> — Encode/decode text and files</li> <li> <strong>JWT Decoder</strong> — Decode JSON Web Tokens without a server</li> </ul> <h3> Calculators </h3> <ul> <li> <strong>Scientific Calculator</strong> — Trigonometry, logarithms, constants, complex expressions [源]</li> <li> <strong>GST/VAT Calculator</strong> — Compute business tax for India, Nepal, Europe [源]</li> <li>BMI, EMI, Age, Date/Time calculators</li> </ul> <h3> Converters </h3> <ul> <li>Unit converters (length, weight, temperature, etc.)</li> <li>Text encoders (URL, HTML, Unicode)</li> <li>Format converters (XML, CSV, YAML)</li> </ul> <h3> Utility Tools </h3> <ul> <li><strong>QR Code Generator</strong></li> <li><strong>Password Generator</strong></li> <li>Certificate and hash tools</li> </ul> devtools tools webtools