Add Line to Image
Draw lines directly onto your images with customizable colors, styles, and thickness. Features include solid, dashed, dotted, and brush strokes, zoom controls, undo support, and instant PNG download. 100% private - images never leave your device.
Drop your image here
or click the button below to select a file
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About Add Line to Image
Welcome to the Add Line to Image tool, a free online image annotation utility that lets you draw lines directly onto your images. Whether you need to highlight important areas, create simple annotations, add markup for feedback, or make quick diagrams, this tool provides everything you need with an intuitive interface.
Key Features
Multiple Line Styles
Choose from solid, dashed, dotted, or brush strokes to match your annotation needs.
Full Color Control
Pick any color with the color picker or use quick-access preset swatches for common colors.
Precision Zoom
Zoom in up to 500% for precise drawing on detailed areas of your image.
100% Private
Your images never leave your device. All processing happens locally in your browser.
How to Use This Tool
- Upload your image: Click the upload area or drag and drop an image file onto it. Supported formats include JPG, PNG, GIF, WebP, and BMP.
- Select line style: Choose from solid, dashed, dotted, or brush stroke styles using the toolbar buttons.
- Pick a color: Use the color picker for any color, or click a preset swatch for quick selection.
- Adjust thickness: Use the slider to set your desired line width from 1px to 50px.
- Draw on the canvas: Click and drag on your image to draw lines. Use zoom controls for precision work.
- Undo mistakes: Click "Undo" to remove the last line drawn, or "Reset" to clear all drawings.
- Download result: When finished, click "Download" to save your annotated image as a PNG file.
Common Use Cases
- Document Markup: Highlight text or sections in document screenshots for review and feedback.
- Bug Reporting: Circle or point to UI issues when reporting bugs to development teams.
- Educational Content: Add arrows and highlights to explain concepts in educational materials.
- Photo Annotation: Mark areas of interest in photographs for presentations or documentation.
- Design Feedback: Draw attention to specific elements when providing design review comments.
Frequently Asked Questions
What image formats are supported?
This tool supports all common image formats including JPG/JPEG, PNG, GIF, WebP, and BMP. Simply drag and drop or click to upload your image file.
Can I undo my drawings?
Yes! The tool supports multi-level undo. Each line stroke can be undone individually, and you can also reset to the original image at any time using the Reset button.
Is my image uploaded to a server?
No, your image never leaves your device. All processing happens directly in your browser using HTML5 Canvas technology, ensuring complete privacy and security.
What is the maximum image size?
There is no strict limit, but very large images may affect performance depending on your device. For best results, use images under 4000x4000 pixels. The tool automatically scales the display while preserving original resolution for downloads.
Can I use this on mobile devices?
Yes! The tool is fully touch-friendly and works on tablets and smartphones. You can draw with your finger or stylus on touch-enabled devices.
Reference this content, page, or tool as:
"Add Line to Image" at https://MiniWebtool.com/add-line-to-image/ from MiniWebtool, https://MiniWebtool.com/
by miniwebtool team. Updated: Jan 23, 2026