Image Annotator
Add arrows, text, shapes, highlights and marks to your images online.
Upload an image and mark important areas with text, arrows, shapes, highlights and blur tools. Export and download your annotated image.
Drag & Drop your image here
or Choose Image
Supported Formats: JPG, PNG, WebP, GIF, AVIF, BMP, TIFF, SVG
🔒 100% In-Browser Privacy: Your photo is loaded, marked, blurred, and encoded entirely inside your web browser. Zero image data is ever uploaded or transmitted to external servers.
Annotate Images Online with Precision
Everything you need to mark screenshots, highlight data, draw arrows, and obscure sensitive details.
Draw directional arrows with crisp geometric arrowheads. Point directly to buttons, form fields, and key interface elements in bug reports and tutorials.
Insert sharp typography with customizable font sizes, colors, and high-contrast background boxes for readability over complex photographic backgrounds.
Conceal passwords, personal names, account numbers, and faces with pixelated mosaic blur directly rendered into the output image matrix.
Apply vibrant translucent highlights over scanned documents, receipts, and source code while keeping the underlying text 100% legible.
Frame critical sections with outlined or filled rectangles and circles. Adjust border widths, colors, and fill opacity to create clear visual hierarchy.
Unlike screenshot tools that downscale your image to screen size, our engine projects your vector annotations onto the full native camera or screenshot resolution.
Practical Annotation Use Cases
Streamline communication across engineering, design, education, and documentation.
Highlight broken UI components, attach numbered callout arrows, and blur confidential test credentials before attaching to Jira or GitHub issues.
Create instructional walkthroughs with clear arrows, sequential steps, and circled buttons that guide users through complex workflows.
Annotate website mockups, specify padding changes, markup typography adjustments, and point out alignment issues directly on the design.
Pixelate sensitive financial numbers, addresses, and ID cards before sharing documents publicly or transmitting via email.
How to Annotate an Image Online
Follow these 4 simple steps to mark and export your photos.
Drag & drop or select your photo or screenshot. The canvas instantly initializes at native resolution.
Pick an arrow, rectangle, circle, text box, highlighter, or blur region from the top toolbar.
Click and drag onto the canvas. Adjust colors, stroke widths, and text fonts. Use Select to reposition items.
Choose JPG, PNG, or WebP format and download your high-resolution annotated image instantly.
Frequently Asked Questions
Everything you need to know about photo annotation, vector tools, and blur features.
An image annotator is a visual editing tool that allows you to add explanatory notes, arrows, highlights, geometric shapes, blur zones, and text callouts onto photos and screenshots.
Upload your photo, select an annotation tool from the toolbar (such as Arrow, Pen, Rectangle, Text, or Blur), configure your color and stroke width, and draw directly onto the image canvas.
Yes. Select the Text tool, click anywhere on the image, type your message, and customize font size, color, bold, italic, and background fill.
Yes. Choose the Arrow tool, click and drag from the start point to the end point. The tool programmatically creates a clean line with a proportional arrowhead.
Yes. The Pen tool enables freehand sketching, circling, and handwriting with customizable stroke thickness and color.
Yes. The Highlight tool applies a semi-transparent colored stroke over text, data tables, or visual elements while keeping the underlying image readable.
Yes. Use the Rectangle and Ellipse tools to draw outlines or solid filled boxes and circles with adjustable border thickness and fill opacity.
Yes. The Blur tool pixelates selected rectangular regions to conceal sensitive information, passwords, and faces directly in your browser.
Yes. Switch to the Select tool, click on any shape or text box to display its bounding box, and drag it to a new location or resize it.
Yes. Click the Undo button or press Ctrl+Z (Cmd+Z on Mac) to revert the most recent annotation step.
Yes. Click the Redo button or press Ctrl+Shift+Z to restore an undone annotation.
Yes. ReducerImage supports touch drawing, pinch zooming, and mobile gestures on iPhone, iPad, and Android devices.
You can upload JPG, PNG, WebP, GIF, AVIF, BMP, TIFF, and SVG images.
Yes. Click Export & Download to rasterize all annotations onto your original photo and download the result.
You can export the annotated image as JPG (with adjustable JPEG quality), PNG (lossless), or modern WebP.
No. The editor exports annotations rendered at the original full image resolution (e.g. 4000×3000 px), not the scaled screen view.
No. All drawing, blurring, and image generation occurs 100% locally in your web browser. Zero image data is sent to external servers.
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