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Free Online Colony Counter

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For research and education onlyAI counts used: 0/2

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Step 1

Upload a clear plate image

Step 2

Run AI detection

Step 3

Review and fix boxes

Step 4

Export as image

Online colony counting

Use the website for fast, no-login colony counting from agar plates, petri dishes, and similar CFU-style images. Upload a plate photo, run AI detection, then correct boxes before recording your final count.

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BiyoLabs colony counter in the browser with AI-detected colonies on an agar plate

About this colony counter

Use this free online colony counter to estimate CFU counts from an agar plate or petri dish image in seconds. The tool detects bacterial colonies with automated counting so you can review boxes, adjust detections, and keep a clear final count.

How it works

1Upload a clear agar plate or petri dish photo.
2Run AI detection to count visible bacterial colonies automatically.
3Review detections, then copy or download your final result.

Who is this for?

This colony counter is useful for microbiology labs, researchers, food safety testing teams, and students who need quick CFU-style plate estimates. It helps standardize bacterial colony counting from agar plate and petri dish images while keeping manual review in the workflow.

Colony counter FAQ

Is there a free online colony counter?

Yes. BiyoLabs offers a free online colony counter in your browser — upload a plate image, run AI detection, edit boxes, and export an annotated PNG. No login is required for the public tool (2 free AI counts per visitor).

Is the BiyoLabs colony counter free?

Yes. The public web colony counter is free with 2 AI counts and no login. Sign in for 3 more free AI counts and to open the workspace colony counter with saved plate projects. After that, upgrade to BiyoLabs Pro or download the mobile app for unlimited counts.

How accurate is AI colony counting?

Accuracy depends on image quality, lighting, colony density, and plate type. Use the tool for AI-assisted counts, then review and correct boxes manually — especially on crowded plates, merged colonies, glare, or bubbles — before CFU reporting.

What kind of images work best?

Use a sharp, top-down photo of an agar plate or petri dish with even lighting and clear contrast between bacterial colonies and the background. Cropping close to the plate usually improves bacteria counting results.

Can I use this for bacteria counting or CFU counting?

Yes. The tool is built for bacterial colony counting and CFU-style plate counts from images. Treat the number as AI-assisted until you have reviewed the colony boxes manually.

Can I fix missed or incorrect detections?

Yes. After counting, you can add, remove, or draw boxes to correct the overlay. Use undo/redo as you review, and toggle boxes on/off to compare against the raw image.

What is confidence?

Confidence is the AI model score for how likely a detected box is a real colony. The confidence slider filters detections so you can choose a stricter or more permissive view before manual review.

Can I export the result?

Yes. Export downloads a PNG of your plate image with the current visible boxes overlaid, which is useful for recordkeeping and sharing a reviewed count.

Can I use the count directly for CFU reporting?

Treat the result as an AI-assisted count, not an unchecked final record. Review the boxes manually, especially for crowded plates, bubbles, glare, merged colonies, or contaminants.