RegionKit Open Editor →
Free · Offline · No account required

Define regions
on any image.

The browser-based region-of-interest editor for computer vision workflows. Draw detection zones, annotate floor plans, define camera coverage areas — tag and classify each region with custom labels and metadata — then export coordinates without installing anything or creating an account.

Open the Editor See features
editor.regionkit.app
11
Shape tools
∞
Regions per scene
0
Account required
100%
Client-side

Built for region-of-interest workflows

Professional zone-drawing tools in a zero-install browser app. No cloud dependency, no lock-in, no account.

Flexible Region Drawing

Draw zones with rectangles, polygons, polylines, circles, ellipses, and keypoints. Every shape you need to mark a region precisely — click-to-place, no drag friction.

Layers, Tags & Classification

Tag each region with custom labels, categories, and free-text descriptions for downstream processing. Organise regions into named layers — detection zones, exclusion areas, floor sections — and toggle visibility per layer to manage complex scenes without clutter.

Shared Vertices

Link adjacent region boundaries so edits stay consistent. When two zones share a wall or edge, moving one vertex updates both — essential for floor plans and tight spatial layouts.

Measurement Tools

Built-in ruler, area, and angle tools for annotating spatial relationships — measure distances between zones, calculate floor section areas, verify camera angles on a plan.

Works Offline, No Install

Runs entirely in your browser. No server, no account, no data upload. Load a frame or floor plan image, define your regions, and save locally — even without an internet connection.

Export to JSON, PNG, COCO & YOLO

Export your scene as a flat PNG (image + all regions composited), native JSON (full fidelity with layers and metadata), COCO JSON, or YOLO TXT. Useful for documentation, feeding a CV pipeline with zone coordinates, or visualising an existing detector's configuration.

Designed for speed

Full keyboard shortcut coverage so your hands never leave the keyboard.

V Select
R Rectangle
P Polygon
L Polyline
C Circle
E Ellipse
A Arrow
T Text
Ctrl+Z Undo
Ctrl+D Duplicate
Ctrl+C/V Copy / Paste
F Fit to screen

Who uses RegionKit?

Anyone who needs to define spatial regions on images for a computer vision system.

For CV Engineers

Load a camera still frame, define detection zones, tripwires, and exclusion regions as named polygons, then export the coordinates for your pipeline. Iterate on zone geometry without redeploying code.

For Facility & Security Planners

Annotate floor plans with coverage areas, detection perimeters, and zone boundaries. Layers keep zone types separated — monitoring areas on one layer, exclusion zones on another — without losing spatial context.

For Researchers

Analyse spatial regions in images for occupancy studies, path analysis, or any experiment requiring structured region data. Draw, label, and export ROIs for quantitative spatial reasoning.

Draw your first region in seconds

No download. No sign-up. Load an image and start defining zones immediately.

Open RegionKit — it's free
Self-hosting

Run RegionKit on your own infrastructure

Need to deploy RegionKit behind a firewall, on an air-gapped network, or as part of a larger CV platform? Get in touch — we're happy to help with self-hosted setups.

hello@regionkit.app

Frequently asked questions

Common questions about defining regions of interest with RegionKit.

What is a region of interest (ROI)?
A region of interest is a specific area in an image your computer vision system should focus on — a detection zone, an exclusion area, a floor section, or a camera coverage boundary. RegionKit lets you draw these regions as polygons, rectangles, or any other shape and export the coordinates for use in your pipeline.
Can I annotate floor plans and camera zones?
Yes. Load any image — a floor plan, a camera still frame, a bird's-eye view, or a site diagram — and draw named, coloured regions. Use layers to separate zone types: detection areas on one layer, exclusion zones on another, alert perimeters on a third.
What export formats are supported?
PNG (flat image with all regions composited, useful for documentation and reports), native JSON (full scene with layers, styles, shared vertices, and all metadata), COCO JSON, and YOLO TXT. The native format is best suited to ROI and zone workflows. COCO and YOLO are included so you can also visualise or feed detection pipelines that expect those formats.
Does it work offline?
Yes. Once the page loads, all work happens locally in your browser. You can disconnect from the internet and continue working. Your scene is automatically saved to browser storage and restored on the next visit.
Is my image data sent to a server?
No. Images and region data are processed entirely in your browser using the Canvas API. Nothing is uploaded. Your floor plans and camera frames never leave your device.
Can I load a floor plan or camera still frame?
Yes. Any raster image works — JPEG, PNG, WebP, BMP. Drag and drop the file onto the canvas, use the file picker, paste from clipboard, or load from a URL.
What shape types are supported?
Rectangles, polygons, polylines, circles, ellipses, arrows, keypoints, and text annotations. Plus three measurement tools — distance ruler, area measurement, and angle measurement — for quantifying spatial relationships within a scene.
Is there a file size limit?
No server-side limit because nothing is uploaded. Performance depends on your browser and device. Floor plans and camera frames up to 20 megapixels work well on modern hardware.