Highlighting That Helps Instead of Colouring the Page
A book drowning in yellow is not well studied; it is well coloured. Highlighting helps only when it is rare enough to mean something.
Why most highlighting fails
Highlighting feels like studying, which is exactly its trap. Marking a sentence is easy and gives a small sense of progress, so people mark far too much. When half a page is yellow, the colour has stopped pointing to anything. Research on study habits generally finds that highlighting on its own is among the weaker techniques, precisely because it is so passive.
Read first, mark second
The single biggest improvement is to read a whole section before marking any of it. Only once you know what the section argues can you tell which sentence actually carries the point. Marking as you go, before you know the shape, guarantees over-marking.
A budget forces judgement
Give yourself a limit: perhaps one or two marks per page. A budget turns highlighting into a decision. To mark this sentence, which one will you leave unmarked? That question is the reading. The constraint, not the colour, is what makes you understand the text.
Mark the bones, not the flesh
- Highlight claims and conclusions, not examples and asides.
- Prefer a few words over a whole sentence; the eye finds them faster later.
- Use the margin for why it matters; colour cannot explain itself.
Turn marks into something active
Highlighting earns its place only if you do something with the marks afterwards: write the marked ideas in your own words, turn them into questions, or use them to build a summary. The SQ3R study method builds this in, asking you to question and recite rather than just mark. The colour is a bookmark for later work, not the work itself.
A quick test
Open something you highlighted months ago. If the marks still guide you straight to the point, your system works. If the page is a wall of yellow that tells you nothing, mark less next time and do more with each mark.
Two colours, at most
If you use colour, give each one a fixed job: one for the main claims, another for things to follow up, and nothing else. A rainbow of colours with no rule is just decoration, and you will not remember what any shade meant by next week. A system you can state in one sentence is a system you will actually keep.
On a screen, the same rules hold
Digital highlighting is even easier to overdo, because it costs nothing and never runs out. The discipline is identical: read the section first, mark sparingly, and export or review the highlights afterwards so they feed into notes. A highlight you never revisit, on paper or screen, did no work at all.
Written by Priya Nandakumar · updated 2026-11-10