Annotate Screenshots Online
Add arrows, text, boxes, highlights, step numbers, and blur sensitive details directly in your browser.
How to Annotate a Screenshot in 3 Seconds
Explain bugs, create guides, and highlight UI elements faster than ever.
Upload or Paste Screenshot
Click upload or simply press Ctrl+V to paste any screenshot directly from your clipboard.
Add Arrows, Text & Markers
Draw arrows, boxes, text notes, highlights, and auto-numbered steps (1, 2, 3) to point out exactly what matters.
Download or Copy to Clipboard
Click Copy to paste into Slack/Teams or Download high-resolution PNG/JPG/WebP images instantly with zero quality loss.
What Can You Use Screenshot Annotation For?
Designed specifically for fast visual communication across teams and tutorials.
Bug Reports
Point directly at UI glitches or broken forms with red arrows and explanatory text notes.
Tutorials & Guides
Add auto-incrementing step numbers (1, 2, 3) to guide users through software workflows.
Customer Support
Show customers exactly which button to click or field to fill in with bright highlight boxes.
Documentation
Create clear, professional visual assets for knowledge bases, READMEs, and help centers.
UI & Design Feedback
Highlight specific layout alignment or color changes directly on website screenshots.
Privacy & Redaction
Permanently blur or redact passwords, credit cards, emails, and account numbers before sharing.
Add an Arrow to a Screenshot
Directional arrows are the most effective way to draw immediate focus to buttons, dropdowns, error alerts, or text fields. ToolJi allows you to customize arrow thickness, color, and positioning with instant drag-and-drop handles.
Blur or Redact Sensitive Information
Safely obscure passwords, phone numbers, profile photos, and financial details. Choose Gaussian **Blur**, mosaic **Pixelate**, or opaque **Redaction** blocks that permanently replace underlying pixel data in exported files.
Are My Screenshots Uploaded to a Server?
No. ToolJi processes screenshots entirely within your local browser memory using HTML5 Canvas. Your image is never transmitted over the internet or saved to any external database.
Frequently Asked Questions
Everything you need to know about screenshot annotation on ToolJi.
How do I annotate a screenshot online?
Simply upload your screenshot or press Ctrl+V to paste it directly from your clipboard into ToolJi. Select annotation tools like arrows, text, boxes, highlights, or blur, then click 'Download' or 'Copy' to get your finished image.
Can I paste a screenshot directly into ToolJi?
Yes! Take any screenshot on Windows, Mac, Linux, or mobile, then press Ctrl+V (or Cmd+V) inside ToolJi. The screenshot will load into the canvas immediately without saving to disk first.
How do I add an arrow to a screenshot?
Click the 'Arrow' tool in the left palette, then click and drag on the screenshot to draw a bold directional arrow pointing directly at any button or UI element.
Can I blur or hide sensitive information on a screenshot?
Yes! Use the 'Blur' tool to apply Gaussian blur, the 'Pixelate' tool for mosaic blocks, or the 'Redact' tool to permanently cover passwords, credit cards, or email addresses with opaque solid blocks.
Can I add numbered step counters (1, 2, 3) for tutorials?
Yes! Select the 'Step #' tool and click anywhere on the screenshot to place auto-incrementing numbered circles (1, 2, 3, 4...). It's ideal for building step-by-step documentation and user guides.
Are my screenshots uploaded to any server?
No. ToolJi processes all image decoding, vector drawing, pixel blurring, and rendering 100% locally inside your web browser. Your screenshots never leave your device.
What image formats are supported?
ToolJi supports input PNG, JPG/JPEG, and WebP images. You can export your annotated screenshot in PNG, JPG, or WebP formats.
Does ToolJi reduce the resolution of my screenshot?
No. All annotations are rendered onto a high-resolution offscreen canvas matching the exact original dimensions of your screenshot (e.g. 1920x1080, 4K).
Can I copy the annotated screenshot directly to clipboard?
Yes! Click the 'Copy' button in the top toolbar to copy the final annotated image directly to your system clipboard for instant pasting into Slack, Teams, or email.
Is ToolJi Screenshot Annotator free to use?
Yes, 100% free with no signup, no account creation, and no watermarks added to exported images.
Can I use Screenshot Annotator on mobile phones?
Yes! ToolJi works smoothly on mobile touchscreens (Android Chrome, iPhone Safari) with responsive touch drawing and floating bottom toolbars.
How do I delete or edit an annotation?
Click on any annotation with the 'Select' tool to move, resize, change colors, or press Delete/Backspace to remove it.