LAS / LAZ Point Cloud Viewer will not open? Format and display troubleshooting
Troubleshoot LAS / LAZ Point Cloud Viewer by checking signatures, versions, units, coordinates, and browser resources while preserving the source.
Do not rename or overwrite the source first
Make a sample copy and retain the original delivery, size, producer version, and exact error. Open a LAS 1.4 file, compare the header point count and XYZ bounds, then switch to classification colors. Ground is commonly class 2, but that is a convention; all-zero classes may simply mean unclassified data.
Recommended troubleshooting order
- Test the page example or a smaller known-good file to confirm browser functionality.
- Check that the file signature matches its extension and it is not a downloaded HTML error page.
- Compare the supported formats and size limit with the specialist checks below.
- Close other heavy tabs and retry in current Chrome or Edge.
- If it still fails, re-export from the producing application and verify in authoritative specialist software.
Checks for this format
- Header point count is nonzero and XYZ minima are below maxima
- Scale/offset match the coordinate magnitude without overflow
- When RGB exists, points are not all rendered black
- Sampling ratio is visible so displayed count is not confused with source count
Common errors and fixes
LAZ decompression fails
Confirm it is not a renamed ZIP and re-export standard LAZ from the source application; private compression extensions may be incompatible.
The cloud looks like a line or single point
Check scale/offset, units, and extreme outliers; one bad coordinate can distort automatic fit.
When a browser tool is insufficient
- Large files may be sampled; displayed points can be fewer than source records
- Custom VLR/EVLR records may not be interpreted
- No reprojection, accuracy assessment, or ground classification
A visible preview only proves this parser read some structures. It does not prove engineering, manufacturing, scientific, business, or clinical compliance. Keep validation records from the source and receiving systems.
Privacy and safety
The tool reads files locally and does not upload them to FreeTool for parsing. Troubleshooting screenshots, CSV exports, and downloads can still contain sensitive data; de-identify before sharing and clear copies from shared devices.