Paste a screenshot. Scribble in red. Copy it back.

The fastest way to draw on a screenshot online

RedPenIt is a free, no-signup tool for annotating images and screenshots in your browser. Paste a screenshot straight from your clipboard, scribble in red pen to circle a bug or point something out, and copy the marked-up image right back — ready to drop into Slack, Linear, Jira, GitHub, an email, or a doc.

Nothing gets uploaded to a server. The whole tool runs locally in your browser, so screenshots of sensitive UI, internal dashboards, or pre-release work never leave your machine.

What people use it for

• Bug reports — circle the broken element before pasting into a ticket.
• Design feedback — mark up a Figma export or a screenshot of a live site.
• Code & PR reviews — point at a specific line or block in a diff screenshot.
• Teaching and tutorials — highlight buttons and menus in step-by-step guides.
• Customer support — annotate screenshots when walking a user through a fix.
• Quick redlines — mark up an image, a PDF page, or a photo without opening Photoshop.

How to annotate a screenshot with RedPenIt

1. Take a screenshot (⌘⇧4 on Mac, Win+Shift+S on Windows).
2. Click Paste from Clipboard — or just press Ctrl/⌘+V — to drop it onto the canvas.
3. Drag with your mouse or finger to draw in red pen. Use Undo to remove the last stroke.
4. Click Copy to Clipboard to paste the annotated image straight into Slack, Linear, Jira, GitHub, or any doc — or Download it as a PNG.

Frequently asked questions

Is RedPenIt free?

Yes. It's free, requires no account, and has no usage limits.

Are my images uploaded anywhere?

No. RedPenIt runs entirely in your browser. Images you paste or open are never sent to a server, which makes it safe for screenshots of internal tools, customer data, or unreleased work.

Can I paste a screenshot directly?

Yes — that's the fastest workflow. Take a screenshot, then press Ctrl+V (Windows/Linux) or ⌘+V (Mac) with the page focused, or click Paste from Clipboard.

Can I copy the annotated image back to my clipboard?

Yes. Click Copy to Clipboard and paste it directly into Slack, Linear, Jira, GitHub, Notion, Gmail, or any app that accepts images.

Does it work on mobile?

Yes — you can draw with your finger on touch devices. The desktop paste-from-clipboard flow is where it's fastest, though.

What file formats does it support?

Any image format your browser can open — PNG, JPG, GIF, WebP, and more. Downloads are saved as PNG.