Annotate a screenshot with arrows, boxes and text
Turn a screenshot into an explanation: point at things with arrows, ring them with boxes, highlight a line, write a label, and drop numbered step markers for a walkthrough. Everything stays editable until you export, so you can nudge an arrow rather than start over. It runs entirely in your browser — no upload, no account, no watermark on the way out.
How to annotate a screenshot
Bring in the screenshot
Paste from the clipboard, drop a file, or click to browse.
Mark it up
Pick arrow, rectangle, ellipse, text, highlight or a numbered step marker, then draw on the image. Change colour and thickness at any time.
Export
Save as PNG or JPG. Annotations are rendered into the image at full resolution.
What Annotate Image can do
Numbered steps
Auto-incrementing markers, for documenting a flow one click at a time.
Arrows, boxes and highlights
The vocabulary of a good screenshot, in one toolbar.
Editable until export
Move, restyle or delete any mark — nothing is committed early.
Private
Internal dashboards and admin screens are annotated on your device.
Annotate Image — frequently asked questions
Can I annotate a screenshot straight from the clipboard?
Yes. Take the screenshot, click this page and press ⌘V (Ctrl+V on Windows) — it drops straight onto the canvas.
Can I add numbered steps to a screenshot?
Yes. The step tool places a numbered badge and increments automatically, so a five-step walkthrough is five clicks.
Can I blur something out here too?
Use the Blur Image tool for redaction, or the all-in-one Image Editor, which has both blur and annotation on the same canvas.
Do my images get uploaded to a server?
No. Every tool on Notoo Tools runs as JavaScript and WebAssembly inside your browser tab. There is no server that receives your files — you can disconnect from the network after the page loads and the tool keeps working.
Do I need an account or a subscription?
Neither. There's no sign-up, no email, no free-tier limit and no watermark. Bookmark the tool and it opens straight into the work.