How to Annotate and Mark Up Screenshots on Mac
Marking up a screenshot is two jobs, not one. There is what you want to draw attention to, and there is what you want gone before anyone else sees it. Most editors only do the first.
Every capture opens in the editor with a floating tool palette: Draw, Shape, Annotate, Focus and Redact. Eighteen annotation kinds in total, each remembering its own last colour, width and opacity.
Annotate a screenshot
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Open the capture in the editor
Take any capture and it opens ready to edit — no round trip through another app, and no floating thumbnail to catch before it disappears. You can also open anything from the library later.
Draw, Shape, Annotate, Focus and Redact, with a colour satellite for each. -
Draw an arrow or a shape
Under Draw: arrow, line, pen and highlighter — the highlighter uses a multiply blend so it reads like a real marker rather than a solid block. Under Shape: rectangle, rounded rectangle with an adjustable radius, ellipse, and a callout with a translucent fill and accent border.
Defaults are red strokes and yellow highlight. Each tool remembers what you last set, and there is an eight-colour recent palette.
Per-tool style memory means the second arrow matches the first. -
Add numbered steps that count themselves
Under Annotate: numbered steps drop a filled circle with the next digit, with an optional ring. Documenting a five-step process does not mean typing "1", "2", "3" by hand and renumbering when you insert one.
Dimension and ruler markers label a region "W × H" in pixels — useful for design handoff and bug reports where the size is the point.
The numbers increment on their own as you place them. -
Direct the eye with Focus
Spotlight masks a circular area and dims the rest to 45%, which is often clearer than an arrow when the target is small and the surroundings are busy. The magnifier gives a 2× circular zoom in place.
There is also free-floating text, a bordered text box and a callout bubble, each with font, size and bold, italic, underline or strikethrough.
Spotlight and magnifier, for when an arrow is not enough. -
Blur what should not be shared
Switch to Redact and choose blur, pixelate or blackout. Snip Studio has already read the capture on your Mac and can list the emails, URLs, file paths, faces and QR codes it found, with masked previews and confidence scores — so you can redact them in one action rather than hunting by eye.
Redaction is applied at export. The copy you share is flattened so the hidden content cannot be recovered; the original in your library stays untouched.
Redact one item, or bulk-redact every email or URL at once. -
Crop, rotate and straighten without losing anything
All non-destructive, with a rule-of-thirds grid and six aspect presets. Annotations remap through the same transform, so an arrow stays pointing at the thing it was pointing at.
Zoom runs 0.25–2.5× on a scrollable canvas, and undo goes back 50 steps.
Drawing a filled rectangle over a password looks like redaction. In any format that keeps layers, the shape can be moved or deleted and the text underneath read. Snip Studio flattens redactions into the exported copy specifically so that cannot happen, while keeping your own version editable.
The eighteen tools, grouped
| Group | Tools |
|---|---|
| Draw | Arrow, line, pen, highlighter |
| Shape | Rectangle, rounded rectangle, ellipse, callout |
| Text | Free text, bordered text box, callout bubble |
| Annotate | Numbered steps, dimension and ruler markers |
| Focus | Spotlight, magnifier |
| Redact | Blur, pixelate, blackout |
| Transform | Crop, rotate, flip, straighten |
Nothing is baked in
This is the part that changes how you work. Reopen a capture days later and every arrow, label, spotlight and redaction is still a separate object. Move it, restyle it, delete it. The undo history runs 50 steps deep, and crop and rotate are non-destructive too.
It matters most for the redactions. If you blur an email address, export a copy for a ticket, and then need the same screenshot for an internal document where the address is fine, you do not need to recapture — you remove the redaction and export again. The flattened copy you already sent is unaffected.
Annotating a recording
Annotations work on video too. Every one you draw on a recording becomes a draggable, resizable time-range chip on a timeline lane, so it appears and disappears when you want. Clicking a chip seeks to it, and selecting an annotation pauses the loop so you can restyle it against a steady frame. Details in how to record your screen.
Common problems
An annotation is in the wrong place after cropping
It should not be — annotations remap through crop, rotate and straighten. If one has drifted, undo the transform and reapply it; the remap runs on the transform, not retroactively.
Text is too small when you share it
Text is sized in image pixels, so on a Retina capture it renders at half the apparent size. Set a larger size than looks right on screen, or export at 50% scale so the ratio matches.
You cannot find the blur tool
It is under Redact, not Draw. Blur, pixelate and blackout live together because they all apply at export rather than being painted on.
Detection missed something
Detection is a helper, not a guarantee — it finds emails, URLs, file paths, faces and codes, and it will not know that a project name is confidential. Always look over the capture yourself before exporting; you can redact any region manually.
The editor is greyed out
The editor and annotation studio are part of the paid ULTRA upgrade. Capturing and the library are free.
Undo will not go back far enough
The history is 50 steps. Beyond that, remove the annotation directly — every one is still a separate object, so nothing has to be undone in order.
Frequently asked questions
How do you draw on a screenshot on a Mac?
Take a capture in Snip Studio and it opens in the editor. Use the Draw or Shape tools in the floating palette to add arrows, lines, pen strokes, highlights or shapes.
How do you blur part of a screenshot on a Mac?
Switch to the Redact tool and choose blur, pixelate or blackout. Snip Studio can also list the emails, URLs, file paths and faces it detected so you can redact them in one action.
Can you add numbered steps to a screenshot?
Yes — the numbered-step tool drops a filled circle with the next digit and increments automatically as you place them.
Does annotating change the original capture?
No. Annotations and redactions stay editable objects, and redaction is applied only to the exported copy. Your original stays untouched in the library.
Is the editor free?
No — the editor and annotation studio are part of the paid ULTRA upgrade. Capturing and the searchable library are free.
Editor tools, redaction behaviour and undo depth described from Snip Studio's own documentation and its App Store listing. Last checked 1 September 2026.