Screenshot Annotation
Draw arrows, boxes, and text on screenshots in your browser.
Your images never leave your device. Annotation runs entirely in your browser.
Tool
Why Dockzio?
Simple tools that respect your time and your privacy.
Free and instant
No subscriptions, no paywalls, no waiting.
No sign-up required
Open a tool and get to work immediately.
Private by design
Processing happens locally in your browser whenever possible.
Beautifully built
Clean, fast interfaces designed for everyday productivity.
About screenshot annotation
Mark up screenshots and photos with pens, highlights, rectangles, arrows, and text labels — then download a flattened image.
How it works
Choose a tool, draw on the canvas, and undo or clear as needed. Marks are rasterized into the download — they are not editable layers in another app.
Formats
JPG, PNG, WebP, and AVIF (when your browser can decode them). Output defaults to PNG for crisp annotations.
Limits
This is a lightweight markup tool, not a full design editor. HEIC and advanced vector export are not supported.
Privacy first
Images never leave your device. Annotation runs locally in your browser.
FAQ
Quick answers to common questions.