Precision developer utilities.
Zero data leakage.
High-density web developer utilities and Generative Engine Optimization (GEO) suite engineered for software engineers, SEOs, and webmasters. 100% local browser execution.
Text Diff & Code Comparison
Compare code, JSON, SQL, and text files. Side-by-side split view, character-level diff highlighting, and Git patch exports.
Case Converter & SEO Slug
Convert camelCase, snake_case, PascalCase, kebab-case, and generate clean SEO URL slugs with diacritics removal.
Markdown Editor & Tables
Live GitHub-Flavored Markdown sandbox, interactive visual table generator, and instant .md / .html compiled exports.
API & Payload Inspector
Convert cURL to Go, TypeScript Fetch/Axios, and Python HTTPX. Includes JSON/YAML formatter and offline JWT debugger.
Cron & Regex Visualizer
POSIX crontab natural English translator, 24-hour execution matrix, and real-time regex AST breakdown.
Webhook & Header Tester
Audit CSP/HSTS/CORS headers with ready-made Nginx fixes. Local WebCrypto HMAC-SHA256/512 calculator.
Technical SEO & SERP
Desktop/Mobile SERP pixel truncation calculator, RFC 9309 robots.txt parser, and JSON-LD schema builder.
GEO & AI Search Optimizer
Perplexity & ChatGPT Search citation optimization, AI bot permission matrix, and /llms.txt generator.
Image Enhancer & Compressor
Ctrl+V clipboard paste, aspect ratio cropping (16:9/1:1), WebP conversion, and dual side-by-side zoom comparison.
SVG to Image & Vector Studio
Interactive vector stage with pan and zoom (10%-1000%). Rasterize to high-DPI 1x-8x Retina PNG, WebP, and JPEG.
The Zero-Trust Developer Philosophy
Why engineering teams switch from online scratchpads to Netfox.
Most online formatters and decoders log your request payload on backend servers. Netfox utilizes WebCrypto and local ASTs—your data never leaves your browser process.
Eliminate network round-trips. Code diffing, text conversions, regular expression match evaluations, and HMAC digests are calculated instantly with 0ms network latency.
Strict adherence to RFC specifications: RFC 7519 for JWTs, RFC 2104 for HMAC signatures, POSIX standards for Cron expressions, and W3C CORS recommendations.
Netfox Architecture & FAQ
Frequently asked questions regarding client-side processing, security, and supported standards.
How is Netfox different from other web developer utility sites?▼
Unlike traditional utility websites that upload your JSON payloads, secrets, and authorization headers to remote servers for processing, Netfox operates 100% on the client side using native browser Web APIs (such as window.crypto.subtle, TextEncoder, HTML5 Canvas, and local AST parsers). Your private keys, JWT tokens, code diffs, and API payloads never leave your browser process.
What is Generative Engine Optimization (GEO) on Netfox?▼
Our GEO suite optimizes your website for AI search engines like ChatGPT Search, Perplexity, Claude, and Google AI Overviews. It includes an AI bot permissions auditor, factual answerability scorer, and /llms.txt generator to maximize AI citations.
Does Netfox support offline usage?▼
Yes. Once the initial lightweight static assets are loaded by your browser, every single tool (cURL converter, JWT decoder, Cron parser, Regex sandbox, Header auditor, SEO analyzer, GEO optimizer, Diff checker, Case converter, Markdown editor, SVG studio, and Image sharpener) functions completely offline without requiring an active internet connection.
Can I safely test proprietary code diffs and sensitive images?▼
Yes. All diff calculations and image convolutions execute strictly in your browser's local memory via WebCrypto and 2D Canvas. Nothing is ever uploaded or cached on a server.