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Privacy-First Web Suite
DevTools Hub
An all-in-one suite of modern, offline-capable developer utilities. Format JSON, analyze file magic bytes, test regular expressions, decode JWTs, and generate cryptographic hashes — completely in your browser with zero server data transmission.
DevTools Hub
devtool.mvp93.fyi
100% Offline
Runs completely in-browser
Zero Tracking
Data never leaves your machine
Sub-Millisecond
WASM & Web Workers speed
Free Forever
No paywalls or rate limits
Tool Directory
Built for Daily Engineering Workflows
Every tool is isolated, client-side, and designed to perform fast operations without external dependencies.
Formatters & Editors
JSON Formatter & Validator
Format, minify, validate, and repair complex JSON structures with line highlighting.
Markdown Viewer & Editor
Real-time side-by-side Markdown rendering with GitHub-flavored markdown extensions.
Inspectors & Analyzers
File Inspector
Analyze binary headers, magic bytes, true MIME signatures, and file structure breakdown.
Regex Tester & Explainer
Interactive regular expression tester with live matches, match groups, and syntax guide.
JWT Token Decoder
Inspect JSON Web Token headers, payloads, scopes, and expiration timestamps securely.
Encoders & Decoders
Base64 Encoder / Decoder
Reliable UTF-8 text and binary file Base64 encoding and decoding.
URL Encoder & Decoder
Encode query parameters and sanitize URLs with complete RFC 3986 compliance.
Generators & Converters
Cryptographic Hasher
Compute SHA-256, SHA-512, MD5, and SHA-1 checksums instantly via browser crypto.
Color Code Converter
Convert seamlessly between HEX, RGB, HSL, and HSV with live palette previews.
Security Architecture
Why In-Browser Matters
Most online tools transmit your sensitive JSON payloads, tokens, and binary files to third-party servers for processing. DevTools Hub keeps 100% of execution inside your browser's sandboxed runtime.
No backend API receives your confidential tokens or data
Instant response times unaffected by server network latencies
Works seamlessly in airplane mode and on restricted internal networks
Execution Model100% Client-Side In-Browser Processing
Data PrivacyZero Server Uploads (No telemetry, no logging)
Offline CapabilityFully functional without internet connection (PWA)
Engine ArchitectureWeb Workers & WebAssembly (WASM) acceleration
Tech StackNext.js, TypeScript, Tailwind CSS, Lucide Icons
Live Domaindevtool.mvp93.fyi
Open DevTools Hub in Your Browser
Bookmark the suite for quick daily access. No registration, no cookies, no tracking.