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Free GPR software

GPRviewer is ground penetrating radar (GPR) software that runs entirely in your browser. Free to view and adjust your radargrams, its Pro version adds every interpretation tool: rebars, interfaces, filters, C-Scan, 3D and AI-assisted picking.

Open GPRviewer for free

Free account, nothing to install, runs in your browser.

Who is it for?

Engineering and inspection firms, surveyors, utility locating companies, laboratories and teachers: anyone who needs to review a GPR survey without a workstation running the manufacturer’s software.

Free, nothing to install

Opens GSSI (.DZT) and Compass (.nx) files, one or two channels.
12 colour maps, zoom ×0.25 to ×4, A-scan trace.
Depth calibration, dielectric constant, surface alignment.
Background removal, depth cropping.
PNG export; interface in English, French, German and Italian.

Ground penetrating radar radargram displayed in GPRviewer

Pro version: full interpretation

Rebar picking with statistics (minimum, mean and maximum cover; spacing), CSV export.
AI picking: one click picks every rebar in the profile.
Measurements, hyperbola fitting to calibrate velocity, interface tracing and thicknesses.
Frequency filters, deconvolution, exponential or manual gain, migration.
Profile merging, C-Scan plan view, slices, 3D view, profiles on a GPS map.

C-Scan plan view of a grid of profiles on reinforced concrete

Concrete, utilities, geotechnics

On reinforced concrete, GPRviewer is used for cover checks and locating rebars before coring or drilling. For utility locating, it helps follow pipes and cables on dual-frequency antennas. In geotechnics and pavement surveys, interface tracing gives layer thicknesses along the profile.

Interface tracing and thickness calculation on a pavement profile

Built by a GPR specialist

GPRviewer is developed by MDS – Le Matériel de Sondage, a GSSI ground penetrating radar distributor, from its customers’ needs in the field. Radar files stay on your computer: they are never kept on our servers.

Frequently asked questions

Is there free GPR software?

Yes: GPRviewer is free for opening, displaying and adjusting GSSI radargrams in the browser, with a simple account. Advanced interpretation tools are in the Pro version.

How does it compare with RADAN?

RADAN is GSSI’s Windows desktop software. GPRviewer is online and cross-platform, free for viewing, with recent tools such as AI-assisted rebar picking.

Do I need a powerful computer?

No. A recent browser is enough; the heaviest AI computations run on our servers.

How much is the Pro version?

Features and pricing are on the GPRviewer Pro page. Trial codes are offered by MDS and its resellers.