Snaproll — Full Page Screenshot (Chrome, MV3)

Snap the whole scroll.

Capture an entire scrollable web page, then crop and download it as PNG, JPG, or PDF — a lightweight GoFullPage alternative. Zero external dependencies.

How it works

1. Click the toolbar icon (or press Alt+Shift+S) on any normal web page.
2. Snaproll pins the layout first (sticky → relative, fixed backgrounds → scroll), hides the scrollbar and, after the first tile, repeating fixed bars (via visibility, so nothing reflows). On app-style pages where the window doesn't scroll (Gmail, Notion, ChatGPT…) it finds the inner scrolling panel and captures that instead. It scrolls tile-by-tile, and captures each viewport with chrome.tabs.captureVisibleTab (badge shows % progress).
3. Tiles are stitched at full device-pixel resolution and an editor tab opens.
4. In the editor: drag to select a region → Apply to crop, then Download PNG / JPG / PDF or Copy to clipboard. Reset restores the original.

The PDF is written by hand as a single long page with the screenshot embedded as a JPEG (DCTDecode) — no libraries bundled.

Files

manifest.json    MV3 config
background.js    service worker — capture orchestration (scroll + stitch plan)
editor.html/.css/.js   editor tab — stitch, crop, export (PNG/JPG/PDF/copy)
icons/           16/32/48/128 px

Load it (unpacked, for dev/personal use)

1. Open chrome://extensions
2. Toggle Developer mode (top-right)
3. Load unpacked → select this snaproll/ folder
4. Pin the icon, open any page, click it.

Works on Chrome, Edge, Brave, Arc. It cannot capture chrome://, the Web Store, or other extension pages (browser restriction) — the badge flashes no there.

Ship it to the Chrome Web Store

1. Zip the folder contents (not the parent):

   cd snaproll && zip -r ../snaproll.zip . -x ".*"
   

2. Go to the Chrome Web Store Developer Dashboard — one-time $5 registration.
3. New item → upload snaproll.zip.
4. Fill the listing: description, at least one 1280×800 screenshot, a 128px icon (included), category Productivity, and a privacy policy.
   • Privacy note you can reuse: Snaproll processes screenshots entirely on your device. It does not collect, transmit, or store any data on external servers.
5. Justify permissions: activeTab/<all_urls> (capture the page you invoke it on), scripting (measure + scroll), storage/unlimitedStorage (hand the large stitched image to the editor tab).
6. Submit for review (usually a few days).

Known limits

• Pages past Chrome's canvas limits (~32K px a side / ~250M px) are scaled down to fit; the editor footer says so.
• Very long pages take a while (capture is rate-limited to ~1 tile / 0.6s by Chrome).
• Lazy-loaded / canvas / video content may need a scroll-through first.
• Cross-origin iframes render as the browser paints them (no special handling).