Highlighter Tool for Study Notes & Textbooks

What the highlighter actually does in pairPaint

The highlighter sits in the toolbar next to the pencil and the eraser, and it behaves the way a real highlighter does: broad, soft strokes that mark a line without hiding it. Pick it, pick a color, and drag across the words you want to stand out. It works on a blank page, on ruled or graph paper, and on top of an image you have added to the canvas — a photo of a textbook page, a worksheet, or a screenshot of a lesson.

That last part is what makes it a study tool rather than just a paint tool. pairPaint is a free online paint app, but the moment you put a page on the canvas and start marking it up, it becomes a free online whiteboard for studying: annotate, underline, circle and label, then export the finished page. No sign-up, no download.

How to use the highlighter, step by step

1. Open your page. Start on a blank page, or add a textbook page, worksheet or screenshot to the canvas first.
2. Pick the highlighter. Select it from the toolbar, or press the H key.
3. Pick a color. Yellow is the classic, but a small set of colors works better than one (more on that below).
4. Set a comfortable size. A medium width covers one line of text cleanly. Wider strokes are better for headings and big blocks; narrower ones suit small print.
5. Highlight in one smooth pass. Drag steadily across the line, then lift. Short, deliberate strokes beat scrubbing back and forth.
6. Add a note. Switch to the text tool and write a word or two in the margin — why this line matters, in your own words.

Made a mistake? Undo takes it straight back, and the eraser cleans up a stray mark. Nothing is permanent until you export it, which is exactly the safety net paper highlighting never gave you.

Highlighting without ruining your notes

Most highlighted notes fail for the same reason: everything is highlighted, so nothing is. The fix is restraint plus a system. These rules keep notes readable:

• Highlight after reading, not during. Read the whole paragraph first, then mark the one or two lines that carry the idea. If you highlight as you go, you will mark everything.
• One idea per highlight. A single highlighted sentence should be a complete thought. If your stroke runs across three sentences, it is probably three ideas — pick the one that matters.
• Keep strokes on one line. Short strokes stay neat and keep the text underneath readable. Long strokes that wander across lines turn the page into soup.
• Leave white space. Unhighlighted text is what makes the highlighted text stand out. Aim to highlight under a fifth of any page.
• Write, do not just mark. A highlighted line plus a three-word margin note ("causes of erosion") is worth ten highlighted lines with no notes.

A simple color-coding system that actually works

Colors only help if they mean something. Pick a small code, write it at the top of your notes, and stick to it for the whole topic:

• Yellow — definitions and key facts. The "must remember" lines.
• Pink — things you find confusing. Anything pink is a question to ask in class or look up later.
• Green — examples. Real-world examples that make an abstract idea concrete.
• Blue — dates, names and numbers. The facts a test is most likely to ask for.

Four colors are plenty. More than that and you spend the study session decoding your own system instead of revising. The same code works across every subject — once students learn it, they can read any highlighted page at a glance.

Study methods that pair well with highlighting

Highlighting alone is a weak way to revise — it feels productive while the ideas slide past. Pair it with one active step and it becomes genuinely useful:

• Highlight, then close and recall. Mark the key lines, close the page, and say the idea aloud from memory. If you cannot, the highlight told you what to re-read.
• Turn highlights into questions. After marking a page, write one question per highlighted section in the margin. Answer them the next day without looking.
• Summarize in your own words. At the bottom of the page, write a two-sentence summary using only the highlighted lines as prompts.
• Re-highlight a week later. Open the same page and mark only what you still remember. The gap between the two passes shows exactly what needs more work.

For printable practice to annotate, freekidworksheets.com has free worksheets you can print or bring onto the canvas — highlight the key words in a reading passage, circle the vocabulary, and add margin notes, all without touching the original sheet.

For teachers: highlight live on the whiteboard

The highlighter earns its place in the classroom when it goes live. Project pairPaint onto the classroom display, open a passage or diagram, and highlight the key term at the exact moment you explain it. Students watch the emphasis happen in real time, which beats a pre-highlighted slide because the timing carries the meaning.

It is one reason teachers call pairPaint the best paint app to teach on: the same tool that draws also teaches. Put a science diagram on the canvas and highlight the labels as you name each part. Open a math problem on graph paper and highlight the step where most students go wrong. In a shared drawing room, students can highlight on their own copies too — ask the class to highlight the sentence that answers the question, and you can see at a glance who found it.

For parents and kids: homework and reading time

Younger kids can use the highlighter too, with a simpler job: find the important word. Give a child a short paragraph and ask them to highlight the one word that tells them what it is about. It turns reading into a treasure hunt and builds the habit of looking for meaning instead of just decoding letters.

For homework, the highlighter makes instructions less scary. Open the assignment on the canvas together, highlight the action words — circle, write, draw, explain — and the task breaks into clear steps.

Saving, printing and sharing your highlighted notes

When the page is done, export it as a PNG to share in the class chat, or as a true-A4 PDF that prints exactly like the screen — highlights, margin notes and all. Because the canvas autosaves in the browser, an interrupted study session is never lost: close the tab, come back tomorrow, and the highlighted page is waiting exactly as you left it.

One last tip: keep a clean copy. Before highlighting a page you may need again, export the unmarked version first. That way you always have a fresh page to re-highlight from — and a marked-up page to revise from.

Frequently asked questions