Chalkline Overlay

Draw and annotate over any web page, or over a snapshot of the whole screen.

Chalkline Overlay is a whiteboard toolkit for teachers and presenters on Chromebooks. Draw and write over websites, Google Docs and Slides, or over a snapshot of the whole screen, then keep using your pages underneath. Draw and annotate Pen, highlighter, eraser, lines, arrows, shapes, text, laser pointer and fading pen. Freehand shapes can turn into clean circles and rectangles. Drawings stay attached to the page and move when you scroll. Select, move and resize anything. Undo and redo. Blank boards, grid, lined and music paper. Paste a picture with Ctrl+V. Take a screenshot of any area. Save as PNG or PDF, including a whole scrolling page or every Google Slides slide with its own notes. Tools for every subject Maths: graph plotter, number lines, fraction pieces, base-10 blocks, algebra tiles, ruler, protractor, set squares and compass arcs. Science: circuit symbols, lab equipment, periodic table, cells. Geography: blank maps you can colour. Languages: handwriting lines, reading strip, Arabic letters. Music and art: staves, notes, piano, calligraphy and spray brushes. Classroom helpers Exam screen: a large full-screen display with the time and date, a countdown or count-up timer, sections and breaks, reminders, rules, messages, school logo, saved exams, extra-time timer and an exam log PDF. Worksheets: write on a PDF or pictures and save the marked-up pages. Others: noise meter, lesson timeline, student picker and group maker, spinner, scoreboard, timer, dice, QR code maker and screen recording with voice. Easy to use and accessible Large buttons for touch screens, a movable toolbar, an Arabic option for menus, and easy-read and dyslexia-friendly fonts. For schools Works with Google Admin force-install. School name, logo and defaults can be preset through policy. Everything works on the device. Nothing is uploaded.