HTML5 Viewer

HTML Editor is a focused native Mac app for the last mile of shipping to the App Store: writing and polishing HTML, and turning your screenshots into every size Apple asks for. Two tools live inside one quiet window. THE EDITOR • Open any .html, .htm, .css, or .js file. • See it rendered instantly in a live WebKit preview next to your code. • HTML syntax highlighting — tags, attributes, strings, comments. • Line numbers that stay readable at every font size. • Monospace font with adjustable size from 10 to 24 points. • Word wrap toggle, built-in find bar, multi-level undo. • Open and save with standard macOS file dialogs. • Keyboard shortcuts: ⌘N new, ⌘O open, ⌘S save, ⇧⌘S save as. No dev server, no Node, no build step, no login. Just a native window and your file. THE SCREENSHOT CONVERTER Drag your screenshots in, pick a device, press Export. Every App Store Connect screenshot size Apple asks for is built in: • iPhone — 6.9″ (16 Pro Max), 6.7″, 6.5″, 5.5″, 4.7″ • iPad — 13″ (M4), 12.9″, 11″, 10.5″ • Mac — 2880×1800, 2560×1600, 1440×900, 1280×800 • Apple Watch — Ultra 49mm through Series 3 40mm • Apple TV — HD and 4K • Apple Vision Pro • Custom — any width × height in pixels Three fit modes: • Fit — letterbox with a background color of your choice • Fill — scale and crop to fill the frame • Stretch — exact target dimensions Export to PNG or JPEG with an adjustable quality slider. Batch-process a whole folder in one pass. Output files are auto-named with the target dimensions, ready to upload. PRIVACY, BY DEFAULT HTML Editor runs entirely on your Mac. • No accounts, no sign-in, no profiles. • No analytics, no telemetry, no third-party SDKs, no advertising. • No network requests made by the app itself. • Files stay on your Mac — the app runs in Apple's sandbox with only user-selected file access. • Screenshot conversion happens on-device with Core Graphics. Your code is your code. Your screenshots are your screenshots. REQUIREMENTS macOS 14 Sonoma or later. Universal binary — runs natively on Apple Silicon and Intel.