Free Screenshot Editor for Firefox
You just took a screenshot. Now you need to edit it — add an arrow, type a label, blur out an email address. Do you really need to open a separate app for that?
No. FullScreenie has a full screenshot editor built right into Firefox. Capture and edit in one step, without leaving your browser.
What the Editor Can Do
Pen Tool
Freehand drawing to circle elements, underline text, or sketch quick annotations. Adjustable color and stroke width.
Arrow Tool
Draw arrows that point directly at the thing you're talking about. Clean, straight, and professional.
Rectangles & Ellipses
Frame content with clean shapes. Great for highlighting sections of a page or UI element.
Text Tool
Drop text labels anywhere on the screenshot. Add context, notes, or step numbers.
Highlight
Semi-transparent color overlay to draw attention to specific text or areas without covering them.
Blur Tool
Pixelate sensitive information — names, emails, account numbers, faces. Essential for sharing screenshots publicly.
Crop
Trim down to just the part you need. Remove extra whitespace or focus on a specific section.
How It Compares to Other Screenshot Editors
Most screenshot tools either don't have an editor, or lock it behind a paywall:
Editor Tips
- Undo freely — Press Ctrl+Z to undo any annotation. There's no limit.
- Change colors — Use the color picker in the toolbar to match your annotation to the context.
- Adjust stroke width — Thicker strokes for presentations, thinner for detailed markup.
- Clear all — Start over with one click if your annotations get messy.
- Blur before sharing — Always blur personal info if you're generating a share link.
One workflow, zero app switching. Capture a screenshot, edit it in the built-in editor, then copy to clipboard or share with a link — all without leaving Firefox. That's the whole point.
Edit screenshots right in Firefox
Full editor. Zero cost. No separate app needed.
Add to Firefox — It's Free