How to Annotate a Screenshot for Free: Arrows, Boxes, Blur and Text
September 12, 2026
A screenshot on its own says "look at this". An annotated one says "look here, this is what it means, and ignore the rest". The second is worth sending; the first usually gets a reply asking what they are supposed to be looking at.
You do not need a design tool for this. Four marks cover nearly every case, and the discipline is in using few of them.
The four marks and what each is for
- Box -- "this region". The default. Draw it slightly larger than the thing, never touching the text inside it.
- Arrow -- "this exact point", or "from here to there". Start it in empty space and end it on the target, not the other way round.
- Blur -- "this is not for you". Names, emails, amounts, account numbers. Pixelate rather than smudge; a soft blur can be undone by anyone patient.
- Text -- one short label, not a paragraph. If it needs a sentence, put the sentence in the message and keep the label to three words.
Rules that keep it readable
One colour for everything on the image. Red is conventional and reads instantly; the moment you add a second colour the reader starts wondering whether it means something.
Fewer marks than you think. A screenshot with one box is a screenshot with one point. Three boxes and two arrows is a puzzle. If you need to show four things, send four screenshots or make a walkthrough.
Crop first. Everything you cut away is attention returned to what is left, and a crop is the one annotation nobody has to interpret.
Doing it in the browser, without a watermark
Demorta’s screenshot tool captures the area you drag on any page and opens it in an editor with exactly those tools: box, arrow, pen, highlighter, text, pixelating blur, and crop. Undo is Ctrl+Z, and Download gives you a clean PNG. It is free with a free account, and there is no badge on the file. Try the free screenshot tool.
It also takes an image you already have -- paste one with Ctrl+V, or drop a file on it -- so a phone screenshot or something from a colleague gets the same treatment.
When a screenshot is the wrong format
If you find yourself annotating a sequence -- first click this, then this, then this -- you are making a walkthrough one frame at a time. A recorded demo does that in a fraction of the effort and lets the reader click through it themselves, which is what Demorta is actually for. The screenshot tool is for the single frame.
Frequently asked questions
- What is the best way to annotate a screenshot?
- Crop to what matters, then use one colour and as few marks as possible: a box for a region, an arrow for an exact point, pixelated blur for anything private, and a short text label rather than a sentence. One point per screenshot.
- How do I annotate a screenshot for free without a watermark?
- The OS editors (Snip & Sketch, Preview) are free but basic. Demorta’s browser screenshot tool captures the area you drag, offers box, arrow, blur, text, pen and crop, and downloads a PNG with no watermark on the free plan.
- Should I blur or black out sensitive data in a screenshot?
- Either works if it is destructive. Pixelation and solid boxes both remove the information; a light Gaussian blur on small text can sometimes be reversed and is better avoided.
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