SOPX logo SOPX
By SOPX • Turn process videos into structured SOPs

Free Online Image Annotation Tool

Add arrows, numbered steps, text labels, highlights, and blur to any screenshot, directly in your browser. No sign-up required.

Supports PNG, JPG, WebP, and SVG. Your image never leaves your device. All processing happens locally in the browser.

Annotate one screenshot here. Or use the same tools inside SOPX, on every step of your SOP →

What Is an Image Annotation Tool?

An image annotation tool lets you add visual markups (such as arrows, text labels, numbered steps, highlights, and blur regions) directly onto screenshots and images. These annotations make images self-explanatory for documentation, training materials, bug reports, and knowledge bases. According to TechSmith's 2023 research, visual instructions with annotations are 3x more effective than text-only instructions, and 67% of employees complete tasks better when instructions include annotated screenshots. Unlike desktop software like Snagit or Skitch, browser-based annotation tools require no installation and work on any operating system.

Last updated:

How It Works

1

Upload your screenshot

Drag and drop, select a file, or paste from your clipboard. Supports PNG, JPG, WebP, and SVG up to 50 MB.

2

Annotate with precision

Use 9 annotation tools: arrows, numbered steps, text, rectangles, ellipses, freehand, lines, blur/redact, and emoji stamps. Undo/redo and keyboard shortcuts included.

3

Export and use

Download as PNG or JPG, or copy directly to your clipboard. Annotations render at full image resolution.

Common Use Cases

SOP Documentation

Add numbered steps and arrows to screenshots to create clear, visual standard operating procedures for any process.

Training Materials

Highlight key UI elements and add text labels to create self-explanatory training screenshots for onboarding.

Bug Reports

Circle bugs, add descriptive text, and blur sensitive data before attaching screenshots to issue trackers.

Knowledge Base Articles

Annotate product screenshots with step markers and text annotations for help center articles and documentation.

Why Use This Tool

9 Annotation Types

Arrows, rectangles, ellipses, text, numbered steps, freehand drawing, lines, blur/redact, and emoji stamps.

Privacy-First

Everything happens in your browser using the Canvas API. Your images are never uploaded to any server.

One-Click Export

Download annotated images as PNG or JPG at full resolution, or copy directly to your clipboard for instant pasting.

Keyboard Shortcuts

Switch tools, undo/redo, and delete with keyboard shortcuts. Designed for speed and efficiency.

Frequently Asked Questions

Find answers to common questions about SOPX.

What image formats are supported?
PNG, JPG/JPEG, WebP, and SVG. These cover virtually all screenshots and images used in documentation.
Is my image uploaded to a server?
No. All image processing happens in your browser. Your image never leaves your device, so it's safe for screenshots with sensitive content.
What is the maximum file size?
50 MB. Images larger than 4096 pixels in any dimension are automatically downscaled to stay within browser limits while preserving quality.
Can I undo my changes?
Yes. The tool supports full undo/redo with up to 50 history steps. Use Ctrl+Z (Cmd+Z on Mac) to undo and Ctrl+Shift+Z (Cmd+Shift+Z on Mac) to redo. You can also delete individual annotations or clear all at once.
What export formats are available?
You can export annotated images as PNG (best quality for screenshots) or JPG (smaller file size). You can also copy the image directly to your clipboard for pasting into documents, Slack, email, or issue trackers.
Can I blur or redact sensitive information?
Yes. The blur tool has two modes: blur (obscures content while keeping visual context) and redact (solid black fill for complete removal). This is useful for hiding passwords, personal data, or API keys before sharing screenshots.
How does this compare to paid annotation tools?
Unlike desktop tools like Snagit or Skitch, this tool runs entirely in your browser with no installation, no account, and no cost. It works on any operating system including Windows, macOS, Linux, and ChromeOS.
Is this tool really free?
Yes, 100% free with no usage limits, no watermarks, and no account required. SOPX built it as a free resource for teams that annotate screenshots for documentation and training.

Used by 50+ operations teams across manufacturing, healthcare, hospitality, and logistics

SOPX saved us weeks of work creating SOPs from our production videos. Now we share standardized procedures with our customers around the world in minutes instead of days.
6 hrs 10 min per SOP, with SOPX
Klemen Zupančič

Klemen Zupančič

CEO, PlanZ

Plant biotech manufacturer

  • GDPR-compliant
  • Encrypted in transit + at rest
  • Not used for AI training

You annotated 1 screenshot here. Annotate every step of a full SOP the same way, inside SOPX.

Film any process once. SOPX builds a structured SOP with steps, clips, and descriptions. Use the same annotation tools on any step, all in one place.

  • ✓ Film a process once, get a structured SOP
  • ✓ Annotate any step inline with the same tools, no app switching
  • ✓ Translate the whole SOP into 50+ languages in seconds
Try SOPX free Book a 15-min demo

Free trial • 10 AI SOPs • No credit card