Upload a screenshot, drop an image, or press Ctrl+V to paste directly from the clipboard. Image Annotation & Markup Tool places a full-resolution drawing canvas over the image immediately, and every mark you add stays in your browser — nothing is uploaded.
Seven annotation tools cover the most common documentation tasks: the arrow points at a specific element in a screenshot; the rectangle and circle draw clean outlines around a region; the highlighter lays a semi-transparent wash over a sentence or a UI element; the pen and line give freehand and straight-line drawing; and the text tool plants a label wherever you click. Each tool shares the same colour picker and line-weight controls, so the arrow pointing at a button can match the rectangle drawn around it.
Getting Started with a Screenshot
- Take a screenshot and press Ctrl+V (or Cmd+V on macOS) anywhere on the page. The image appears instantly on the canvas without a file picker.
- Select Arrow from the toolbar, pick a colour (the terracotta swatch matches the site’s own call-to-action colour), and drag from your starting point to the element you want to call out.
- Switch to Text, click the canvas where you want the label, type your note in the input that appears, then press Enter or click Place.
- If a mark lands wrong, press Undo (the rotate-left icon). Undo and Redo step through every committed stroke.
- Choose PNG or JPEG and click Download. The annotated image exports at the original pixel dimensions of the source file.
What It Accepts: Files, Clipboard and Canvas Behaviour
- Supported formats: JPEG, PNG, WebP, GIF and BMP. Files above 30 MB return the message “File exceeds the 30 MB limit” with the actual size shown.
- Display canvas is capped at 1,200 × 800 px. Images larger than this are scaled down for display only. The download merges annotations at the original resolution, so a 3840 × 2160 screenshot exports as a full 4K annotated file.
- Undo depth is unlimited within the session. Each committed stroke saves a full ImageData snapshot, so you can step back through every arrow, rectangle and text label. Clearing all annotations counts as a single undoable action.
- Clipboard paste requires page focus. Browsers block clipboard reads from background tabs as a security measure — click anywhere on the page before pressing Ctrl+V.