API Key Manager | HTML5 Management Tool

API Key Manager is a secure, client-side API key organizer built entirely with pure HTML, CSS, and JavaScript. No server, no database, no backend setup - just open the file and it works instantly in any modern browser. It lets developers, freelancers, and teams store, organize, search, and protect all their API keys in one place.API Key data is stored in your browser’s localStorage and never leaves your device unless you export it manually. No accounts, no subscriptions, no internet dependency after the first load.Key FeaturesCore Key ManagementAdd, Edit & Delete Keys - full key management with name, value, category, vault, notes, tags, and expiry dateSearch & Filter - instantly search by name, filter by category or vault, and sort by date or nameBulk Actions - select and delete multiple keys at onceKey Strength Meter - automatically rates each key as Weak, Fair, Good, or StrongAuto-Hide Keys - key values are masked by default and auto-hide after a configurable timeoutExpiry Dates - set expiry dates per key; overdue warnings appear automaticallyTags - label keys as Production, Development, Staging, Test, and moreActivity Log - tracks the last 50 actions including adds, copies, deletes, and exportsSecurityAES-256-GCM Encryption - encrypt all stored keys with a master password using the browser’s native Web Crypto API (PBKDF2 key derivation with 200,000 iterations + AES-GCM). No third-party crypto libraries involvedPIN / Password Lock Screen - full-page lock overlay on every app load; supports both numeric PIN and full passwords5-Attempt Lockout - short lockout delay kicks in after 5 failed unlock attemptsZero Server Communication - keys are never transmitted over any networkOrganization8 Built-in Categories - Payment, Cloud, Social Media, Database, Analytics, AI/ML, Messaging, OtherCustom Categories - add, rename, and delete your own categories from within the app; built-in ones are protectedVaults (Key Groups) - organize keys into named, color-coded vaults for project-level separation (e.g. “Client A”, “My Startup”, “Personal”)Export & BackupExport to JSON - full backup of all keys, including vault and category dataExport to CSV - opens in Excel or Google Sheets; includes name, key value, category, vault, tags, strength, expiry, and notesImport from JSON - restore from backup with Merge (keep existing keys) or Replace (overwrite) modePWA & Offline SupportProgressive Web App (PWA) - install on desktop or mobile as a standalone app, directly from the browserFull Offline Use - service worker caches all app files on first load; works with zero internet after thatAdd to Home Screen - works on Android (Chrome) and iPhone (Safari)User ExperienceLight & Dark Mode - toggle between themes; preference is saved across sessionsFully Responsive - works seamlessly on phones, tablets, and desktopsConfigurable Settings - auto-hide delay, date format, confirm-delete prompts, usage count tracking, and moreNo Installation Required - no npm, no terminal, no build step; just upload and openTechnologies UsedHTML5 - semantic, standards-compliant markupCSS3 - custom properties, CSS Grid, Flexbox, animations, and responsive breakpointsVanilla JavaScript (ES6+) - zero frameworks, zero dependencies, modular code structureWeb Crypto API - native browser encryption; PBKDF2 key derivation and AES-256-GCM encryptionlocalStorage API - all data persisted directly in the browserService Worker API - cache-first strategy for full offline capabilityPWA Manifest - installable as a standalone desktop or mobile appFont Awesome - icon set used for category and vault iconsGoogle Fonts (Inter + Fira Code) - clean UI typography and monospaced code fontBrowser Compatibility API Key Manager Pro works on all modern browsers that support the Web Crypto API and Service Workers:Google Chrome (desktop & Android) - recommendedMozilla Firefox (desktop & Android)Microsoft Edge (Chromium-based)Safari (macOS & iOS 16+)Opera (Chromium-based) BraveRequirementsA modern web browser (see compatibility list above) For PWA install: the app must be served over HTTPSNo PHP, no Node.js, no server-side language, no database required Works locally by simply opening index.html, or uploaded to any static hosting (cPanel, Netlify, GitHub Pages, etc.)