Check your property photos
before you upload them
Resolution, exposure, contrast, sharpness, blown windows and colour cast — checked in seconds, for up to 30 images at once. Your photos never leave your computer.
Drop photos here — or choose files
JPG, PNG or WebP · up to 30 images at once · the check runs entirely in your browser, nothing is uploaded
The ratings are reference values, calibrated on real interior photos. The check judges technical quality — not whether a photo shows the room well.
What is checked — and where the limits are
Seven metrics, all computed from the pixels themselves. The thresholds are disclosed so you can judge the ratings; they are deliberately conservative.
| Criterion | What is measured | Good from |
|---|---|---|
| Resolution | Short and long image edge in pixels.The short edge decides — it limits how large the image can be shown. | short edge from 1200 px |
| Brightness | Average brightness of the image (0–255).Dark interiors are the most common reason for weak click rates. | 90–185 |
| Contrast | Spread of brightness — how three-dimensional the image feels.Flat usually means backlight or haze. | from 35 |
| Sharpness | Edge strength (Laplacian variance), measured at 1024 px.Depends on the subject: a sharp white wall has few edges. That is why low-detail images get no rating. | from 800 |
| Highlights | Share of pure white area.Blown windows cost the strongest selling point: the view. | below 12 % |
| Shadows | Share of completely black area.Black corners look like defects nobody can see. | below 5 % |
| Colours | Deviation of the colour channels (white balance).Warm interior light often sits at 10–14 % and is not a fault. | below 14 % |
Measured: resolution, average brightness, contrast, edge strength, pure white and completely black area shares, and the deviation of the colour channels.
The next step after the check
What the check cannot do: make a room look better. Once exposure, perspective and sequence are right, the work moves to staging — furnishing, sky, crop. The 10 photo tips for agents walk through the workflow from shooting to post-processing, including what has to be labelled when AI is used.
No credit card required · 10 free credits · no setup
Frequently asked questions
Are my photos uploaded or stored?
No. The check runs entirely in your browser; images are not sent to a server and are not stored. You can verify this yourself: no network request is made during the check, and the page keeps working if you disconnect after loading.
What exactly does the sharpness value mean?
It measures edge strength (Laplacian variance) on a copy scaled to 1024 pixels. The thresholds are calibrated on real interior photos: sharp shots land around 1100 to 1800, slightly soft ones around 450 to 1100, clearly soft ones around 100 to 350, blurred ones below 40. From 800 an image counts as sharp; below 120 it is too soft for a portal image. The metric depends on the subject — a sharp white wall has few edges by nature. If an image has almost no edges we deliberately give no rating instead of a wrong one, and for low-detail subjects we point out the uncertainty.
What resolution do property portals need?
Requirements differ per portal and change over time; the binding values are in each provider’s guidelines. As a working size: at least 1200 pixels on the short edge for the portal view, around 2000 pixels on the long edge for zoom views and the printed brochure. The check shows you where your image sits.
Can a bad photo be rescued later?
Partly. Exposure, contrast and colour cast can be corrected within limits; a shaken or too-small photo stays unusable. That is why the check pays off before uploading: reshooting costs five minutes, an unusable portal image costs enquiries.
Does the check replace a professional photographer or post-processing?
No. It judges technical quality only: resolution, exposure, contrast, sharpness, blown areas, colour cast. Composition, perspective and the sequence of photos remain your decision — the tips in the article “Photographing real estate: 10 tips for better photos” cover that.
Does the photo check cost anything or need an account?
Neither. No account, no credits, no sign-up. Zestio itself is a separate service for virtual staging, image optimisation, floor plans and brochures — the photo check works independently of it.