Free Tools

Free Screenshot Annotator and Markup Tool Online

Use this free screenshot annotator to mark up any image directly in your browser - add arrows, boxes, text labels, freehand drawing, and blur out sensitive information, then export as PNG or PDF. No sign-up, no upload to a server, and no software to install.

Click to upload a screenshot or image, or drag and drop it here

What is a screenshot annotator and why it matters

A screenshot annotator lets you mark up an image after it's already been captured - drawing attention to a specific area with an arrow, boxing off a section, adding a text label, or blurring out a password field or personal detail before sharing. This matters because a raw screenshot often isn't enough on its own: writing a bug report, a how-to guide, a support ticket, or a social post usually means pointing at exactly the right spot rather than making someone hunt for it in a plain image. A quick markup tool that works entirely in the browser - no software install, no account, no upload - fits naturally into that moment right after you've taken the screenshot and just need to mark it up and send it.

How this tool works

When you upload an image, it's drawn onto an HTML canvas element at full resolution, and every annotation tool draws directly onto that same canvas using standard browser drawing functions - arrows and boxes are calculated from where you click and drag, freehand drawing follows your cursor or finger in real time, and the blur tool averages the color of small blocks within your selected area to permanently obscure the detail underneath, similar to a redaction stamp. Each action is saved to an undo history as you go, so mistakes are easy to reverse. Because everything happens with your browser's own canvas drawing engine, your image is never uploaded anywhere - the final PNG or PDF is generated and downloaded directly from your device.

Common searches this tool answers

How do I add arrows or text to a screenshot online?
How do I blur out sensitive information in an image?
Is there a free screenshot markup tool without downloading software?
How do I annotate an image and save it as a PDF?
How do I highlight or box a specific part of a screenshot?
How do I redact a password or personal info from a screenshot?

How to use it

Upload your screenshot or image by clicking the upload area or dragging a file in.
Choose a tool - Arrow, Box, Text, Freehand, or Blur/Redact.
Pick a color from the swatches or the custom color picker, and adjust the stroke width if needed.
Click and drag on the image to draw, or click once with the Text tool to type a label.
Use Undo to remove the last change, or Clear all to start over, then download as PNG or PDF when finished.

Tips

Use the Blur/Redact tool over any visible passwords, email addresses, or account numbers before sharing a screenshot publicly.
Bright, high-contrast colors like the default yellow and coral work best for arrows and boxes on busy screenshots.
For a step-by-step guide, number your text labels in the order you want readers to follow them.
Undo only reverses one action at a time - use Clear all if you want to start completely fresh from the original image.
Download as PDF if you're sending the annotated image somewhere that expects a document rather than an image file.

Frequently asked questions

Is this screenshot annotator free to use?

Yes. It is completely free, works in your browser, and does not require any sign-up or software installation.

Is my image uploaded to a server?

No. The image is loaded and annotated entirely within your browser using canvas drawing. It is never uploaded anywhere - the download happens directly from your device.

Can this tool capture a screenshot of a webpage directly?

No. Browsers don't allow a regular webpage to capture another website for security reasons - that requires a dedicated browser extension. This tool is for marking up a screenshot you've already taken, using your device's own screenshot function first.

Does the blur tool permanently remove the underlying detail?

Yes. The blur/redact tool averages the pixel colors within the selected area and replaces them, so the original detail is not recoverable from the exported image.

Can I edit text after I've added it?

No, once text is placed on the canvas it becomes part of the image, like any other annotation. Use Undo right after adding it if you need to change it, or Clear all to start over.

What file formats can I export to?

You can download your annotated image as a PNG file or as a PDF document, both generated directly in your browser.

Does this work on mobile devices?

Yes. Drawing tools respond to touch input, so you can annotate images on a phone or tablet as well as with a mouse.

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Free Screenshot Annotator | Add Arrows, Text & Blur to Images