Check Perspective & Distortion
Drop an image here or click to upload
Supports JPG, PNG, WebP
Distortion Quick Reference
Barrel Distortion
Lines bow outward from center. Common in wide-angle lenses.
Pincushion Distortion
Lines bow inward toward center. Common in telephoto lenses.
Mustache Distortion
Mixed: barrel in center, pincushion at edges. Complex to correct.
How to Use
Checking for Lens Distortion
Upload a photo of a known straight subject (building, grid pattern, ruled paper) and overlay the rectangular grid. If the grid lines match your subject's straight lines, there's minimal distortion. If lines curve away from the grid, you have barrel distortion; if they curve toward the grid center, you have pincushion distortion.
Checking Perspective Alignment
For architecture photography, use the crosshair or rectangular grid to check if vertical lines are truly vertical. Converging verticals (keystoning) happen when the camera isn't level. Use this tool to identify how much correction is needed.
Using the Radial Grid
The radial (circular) grid is ideal for checking barrel and pincushion distortion. Radial distortion causes straight lines to curve, but concentric circles remain circular. Compare your image's straight lines against the radial pattern to identify distortion characteristics.
Tips for Accurate Testing
- Use a test chart or photograph a grid pattern (graph paper, tile floor)
- Position the subject to fill the frame edge-to-edge
- Check distortion at different focal lengths if using a zoom lens
- Edges and corners show the most distortion
Common Use Cases
| Application | What to Check | Recommended Grid |
|---|---|---|
| Architecture Photos | Vertical lines, keystoning | Rectangular or Crosshair |
| Lens Testing | Barrel/pincushion distortion | Radial or Rectangular |
| Product Photography | Edge straightness | Rectangular |
| Real Estate Photos | Room proportions, verticals | Rectangular |
| Document Scanning | Page alignment, skew | Rectangular |
About This Tool
This perspective distortion checker helps photographers, architects, and designers identify optical distortions in images. By overlaying reference grids, you can quickly spot lens distortion, perspective issues, and alignment problems that might not be obvious to the naked eye.
Privacy: All image processing happens locally in your browser. Your photos are never uploaded to any server.
Related Tools
- Wire Length Calculator -- Calculate electrical wire length needs with voltage drop analysis and NEC
- Monitor Mount Checker -- Check if a monitor mount supports your monitor based on size, weight, and VESA
- Unit Price Comparison Calculator -- Compare 2-4 products by unit price with visual ranking, savings percentages,
- Roof Pitch Calculator -- Calculate roof pitch, slope angle, rafter length, and area multiplier with
Related Tools
View all toolsSquare Footage Calculator
Calculate area in square feet from room dimensions for flooring, painting, and more
Tip Calculator
Calculate tip amount, total, and per-person split
Online Compass
Digital compass using your device's magnetometer sensor
Split Bill Calculator
Split a total evenly across a group
Receipt Total Calculator
Add line items, tax, discounts, tip, and split totals instantly
Shopping List Builder
Build a smart shopping list with quantities, categories, and budget tracking
Perspective Distortion Checker FAQ
What is Perspective Distortion Checker?
Perspective Distortion Checker is a free utility & everyday tool that helps you Overlay grid patterns on images to detect lens distortion and perspective issues.
How do I use Perspective Distortion Checker?
Enter your input values, review the calculated output, and adjust inputs until you reach the result you need. The result updates in your browser.
Is Perspective Distortion Checker private?
Yes. Calculations run locally in your browser. Inputs are not uploaded to a server by default, and refreshing the page clears session data.
Does Perspective Distortion Checker require an account or installation?
No. You can use this tool directly in your browser without sign-up or software installation.
How accurate are results from Perspective Distortion Checker?
This tool applies standard formulas or deterministic processing logic for estimates. For medical, legal, tax, or investment decisions, verify with a qualified professional.
Can I save or share outputs from Perspective Distortion Checker?
You can bookmark this page and copy outputs manually. Results are not persisted in your account and are typically not embedded in the URL.