OverBoard

Smartboard ink that sticks to the page.

OverBoard is a free writing layer for interactive whiteboards. Write on a worksheet with the board pen, scroll, and your ink scrolls with the page instead of floating on top of the screen. Wipe with your palm to erase. Highlight without covering the words. Save a PDF with the ink on it.

It runs in the browser. No accounts, no uploads; your ink stays on your machine.

Try the demo → · Write on a PDF or HTML worksheet →

Why this exists

The ink tool that ships with a lot of classroom smartboards draws on a see-through layer over the whole screen. It has no idea what's underneath, so when you scroll a worksheet, the ink stays put and ends up on top of the wrong question. OverBoard draws inside the page, so ink always stays where you wrote it.

Features

• Ink that scrolls with the page, and stays lined up when you zoom or resize the window
• Write in the margins: the blank space beside the page is writable too (it just doesn't print)
• Palm eraser on SMART Boards: wipe with your palm, fist or the side of your hand
• Finger scrolls, pen writes, with a toolbar switch if you lose the pen
• Highlighter that sits behind the printed text, so words stay readable
• Cover: tap the ▾ beside Highlighter and pick a cover to black out answers; wipe it away with your palm to reveal them. The same menu sets highlight strength (10–100%)
• Select: circle ink with the pen (or tap one mark), then send a copy to another class period, copy and paste it onto another page, drag it somewhere else, or delete it. A dashed blue box shows what's selected, with its menu beside it (a right-click on the box opens it too)
• Undo and Redo (↶ ↷ on the toolbar, or Ctrl/⌘+Z and Ctrl/⌘+Y, Ctrl/⌘+R or Ctrl/⌘+Shift+Z). Reloading from the keyboard is turned off, so a slip can't throw away the page
• 8 colors + a custom color picker, pen size and smoothing controls (hold − / + to repeat)
• Separate ink for each class period on the same worksheet: P1–P4 to start, or set your own in Settings & help ▸ Settings… (1–12 periods, any names)
• Settings & help ▸ Settings…: class periods (tap a style such as Block A, B… or A1… B1… for A/B days, or type your own names), the pen color at start, and Reset tools to defaults. Saved in the browser, so every worksheet and PDF on that computer uses them. The website and worksheets opened from your computer keep separate settings.
• 8 languages: English, Español, 中文 (Mandarin), Tagalog, Tiếng Việt, Français, Português (Brasil) and العربية (Arabic), in Settings & help ▸ Settings… ▸ 🌐 Language (or the 🌐 list on the PDF app's start screen). It changes OverBoard's buttons, tooltips and messages (and the Board not working? page), not your worksheet. OverBoard starts in the browser's own language when it has it. Translations by Claude; corrections from native speakers are very welcome (shared/strings.js).
• Tooltips: hold the mouse (or pen) over any button, or the smoothing squiggle, to see what it does.
• Save PDF with crisp ink, page by page
• Clear page / Clear all (Undo brings either back), and − / Fit / + zoom that keeps the toolbar the same size, on PDFs and HTML worksheets alike. On a small screen (a laptop) the toolbar shrinks to fit instead of scrolling
• PDFs too: worksheets or whole textbooks, with a chapter list, page jump, and Export PDF with your ink drawn in
• Start from a blank page: blank, lined, graph, dot or isometric paper, and add or remove pages as you go
• The PDF's text stays text: select and copy it, follow its links, and search the whole book (great with OCR'd scans). Exports keep it.
• Autosave in the browser, plus optional save ink into the .html file itself (Chrome/Edge)
• Hide the toolbar down to a small button when you want the whole screen
• ⏱ Timer: big buttons to set it (1–15 minutes, or − / + and hold to go faster), a big countdown you can drag aside or shrink, and a chime at zero (or your own .wav / .mp3 in Settings ▸ Timer sound)
• Colors follow the tool: pen colors for the pen, highlighter colors (yellow first) for the highlighter, cover colors for covers, plus the color picker
• Install the PDF app in Chrome or Edge: it opens from the Dock or Start menu and works with no internet

Use it on a PDF

Open bpmdata.github.io/OverBoard/app and drop in a PDF (or tap to choose one). The PDF opens in the browser; nothing is uploaded.

여기까지가 README 앞부분입니다. 나머지는 원문에서 읽을 수 있습니다. README 전문 보기 ↗