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Screenshot Annotation
Snap to any page element, then annotate without leaving the page.
By The ExtensionTools TeamUpdated Version 0.13.16
Store listing coming soon
Free · No account required · Planned for Chrome, Edge
What it does
The capabilities Screenshot Annotation ships with today, as implemented — not a roadmap.
Element snapping
Hover over the page and the capture frame snaps to element boundaries — buttons, cards, sections — so selections are exact instead of hand-drawn.
Capture the visible area or a region
Alt+A captures everything currently visible; Alt+C lets you drag out a custom region. Both open straight into the annotation editor.
Arrows, boxes, circles and lines
The core markup set for pointing at things: arrows, rectangles, ellipses and freehand lines, with adjustable color and thickness.
Zoom callouts
Add a magnified callout of a small area — with a border linking it to its source — so tiny UI details stay readable in the final image.
Mosaic and spotlight
Pixelate sensitive details with mosaic, or dim everything except the area you want to spotlight when presenting a finding.
Text, highlighter and clipboard
Add text labels and highlighter strokes (drag for freehand highlighting, click to place text), then copy the finished image to the clipboard or download it.
Who it is for
Common situations this extension handles well, and what people typically use it for.
Bug reports
Capture the broken element, snap exactly to it, arrow the problem and paste the image straight into the ticket.
Design and content feedback
Mark up a layout with boxes and notes and share it with the team — no image editor round-trip.
Step-by-step documentation
Number actions with arrows and zoom callouts so small buttons stay visible in guide images.
Redacting before sharing
Mosaic email addresses, prices or names in the capture before it leaves your browser.
How to use Screenshot Annotation
From install to first result in four steps.
Capture
Press Alt+A to capture the visible page, or Alt+C and drag to select a region. On macOS the defaults are Cmd+Shift+S and Cmd+Shift+X.
Snap to an element (optional)
Hover over the page before confirming — the frame snaps to the element under the cursor for a pixel-exact selection.
Annotate in place
Draw arrows and boxes, add zoom callouts for small details, mosaic anything private, and label with text.
Copy or download
Copy the finished image to the clipboard and paste it into chat or a ticket, or download it as a file.
How it compares
An honest look at where this tool fits — and where other options fit better.
| Criterion | Screenshot Annotation | Windows Snipping Tool | macOS screenshot toolbar |
|---|---|---|---|
| Snaps to page elements | Yes — hover to select exact element bounds | Rectangles only | Rectangles only |
| Annotate without leaving the page | Yes — editor opens over the page | Separate editor window | Limited markup after capture |
| Zoom callouts & mosaic | Yes | No | No |
| Captures outside the browser | No — web pages only | Yes — anything on screen | Yes — anything on screen |
| Install needed | Extension | Built into Windows | Built into macOS |
Our take: OS screenshot tools capture anything on your screen and are always installed. Screenshot Annotation is for web pages: element-accurate selection and a full markup set without ever leaving the tab.
Limitations & known boundaries
What this extension does not do, and the cases where results may be imperfect. Stated plainly so you can decide before installing.
- Captures the visible viewport or a region — there is no stitched full-page capture of content below the fold.
- Content inside cross-origin iframes cannot be snapped to, because the extension cannot read those frames' layouts.
- Annotations are flattened into the final image. There are no editable layers or project files to reopen later.
- The editor runs in your browser on the captured bitmap; extremely large captures may be scaled to fit available memory.
- Works in Chromium-based browsers (Chrome, Edge). Firefox and Safari are not supported.
- No cloud sync: captures and annotations stay on the machine where you made them.
Frequently asked questions
Questions people ask before and after installing.
Does it upload my screenshots?
No. Capture and annotation happen entirely in your browser. The image only goes where you send it — clipboard or download.
What does element snapping mean?
When you hover during a capture, the selection frame automatically aligns to the boundaries of the page element under the cursor, giving exact selections without careful mouse work.
Can I capture a full web page from top to bottom?
Not currently. The extension captures the visible area or a region you drag out. Full-page stitched capture is not supported.
Which shortcuts does it use?
Alt+A captures the visible area and Alt+C captures a region on Windows/Linux; Cmd+Shift+S and Cmd+Shift+X on macOS. Chrome's extension shortcut settings can remap them.
Can I edit a screenshot again later?
The exported image is flattened. Keep the annotation session open until you are done — once copied or downloaded, the markup cannot be reopened for editing.
Is it free?
Screenshot Annotation is free to install and use. No account is required.
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Editorial disclosure
We are the developers of the extensions documented on this site. This page describes the shipped version as we built and tested it — including its limitations — and was fact-checked on . Claims are based on our own testing of released builds; where third-party tools are named, their capabilities are described as documented by their publishers.
Try Screenshot Annotation in your browser
Free to install. If it does not fit your workflow, removing it takes one click — no account was created.