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
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.