About ArkC3D

ArkC3D is a browser-based tool for inspecting C3D motion capture files.

Supported Data

3D marker positions, frame ranges, point labels, analog channels, selected C3D parameters, and local CSV export.

Privacy

C3D files and generated CSV contents are processed locally in your browser and are not uploaded to ArkC3D for viewing or export.

ArkC3D records limited anonymous file-open metrics in Cloudflare D1. The application does not store file names, file contents, extracted C3D data, IP addresses, User-Agent values, cookies, or persistent user identifiers in those metrics. ArkC3D does not use Google Analytics.

CSV Export license verification sends the License Key to the ArkC3D license API, which validates it with Lemon Squeezy. The ArkC3D license API does not store purchase email addresses. Lemon Squeezy separately processes buyer and order information for checkout, payment, receipts, and license issuance.

See the Privacy Policy for the complete data-handling description.

Limitations

This tool is intended for research, education, and engineering workflows. It is not a medical device or a full C3D validator and should not be used as the sole basis for clinical diagnosis, treatment, legal, or other high-stakes decisions.

Results are not guaranteed to be complete or accurate. Always verify critical data with appropriate software, source records, and domain expertise.

Some vendor-specific extensions, unsupported processor formats, and full biomechanical validation are outside the current scope.

Independence

ArkC3D is an independent project and is not affiliated with C3D.org or Motion Lab Systems.

C3D format information: C3D.org

Third-party licenses

Contact Us

General inquiries and support for ArkC3D.

Managed by

GipnoArkSystems

Email

contact@gipnoarksystems.com

Scope

Use this contact for product inquiries, feedback, and support related to ArkC3D.

C3D → CSV

Convert C3D Files to CSV Online

Open, inspect, repair, and export C3D motion capture data directly in your browser. Choose CSV tables, a repaired C3D file, or both in one ZIP. Your C3D file and export contents stay on your device.

No C3D uploadNo installNo account

What gets exported

Select the CSV tables you need and download them together as a ZIP archive.

CSV fileContents
markers.csv3D marker coordinates by point frame.
marker_quality.csvMarker validity, residual, and camera count.
analog.csvScaled analog values at the original analog sampling rate.
events.csvEvent time, label, status, context, and description.
metadata.csvUnits, sampling rates, labels, and repair provenance when applicable.

Built for analysis workflows

Use exported CSV data with Excel, MATLAB, Python, R, and other tools that accept tabular data. ArkC3D keeps marker, analog, event, quality, and metadata outputs separate so each table has a clear purpose.

Local C3D processing

C3D files are parsed in your browser and are not uploaded to ArkC3D for viewing or export. Generated CSV contents are also created locally on your device.

Export licenses

CSV Export is US$19.00 for CSV files only and remains on sale; existing keys keep CSV-only access. CSV & Repaired C3D Export is US$39.00 for new customers who need both formats. Repaired C3D Export Upgrade is US$20.00 for active CSV-only License Key holders. Pay once; there is no subscription, and each license has no scheduled expiration. Online License Key verification is required for each export.

Free repair, optional repaired C3D export

Opening, inspecting, repairing supported files, and viewing repaired data remain free. Exporting the repaired .c3d file requires the Repaired C3D Export right and always downloads as part of a ZIP, including when it is the only selected format. Learn about Repaired C3D Export.

C3D viewer included

Before exporting, inspect 3D markers, analog signals, events, force plate metadata, frame ranges, and supported C3D parameters in the ArkC3D viewer. Learn about the online C3D viewer.

Export

Choose files, review export access, or verify an existing License Key.

Files to export

Open a C3D file to select files for export. License options remain available below.

Export license

CSV ExportUS$19.00Pay once · No subscription

CSV tables only; existing CSV Export customers keep this license.

CSV & Repaired C3D ExportUS$39.00Pay once · No subscription

CSV tables plus repaired C3D output after a supported repair; for new customers.

Repaired C3D Export UpgradeUS$20.00Pay once · No subscription

For customers with a verified CSV-only License Key; output requires a successful supported repair.

Before buying repaired C3D export: ArkC3D repairs only supported issues. If repaired output for a specific damaged file is your reason for purchase, test that file first. Opening, supported repair, and review are free.

Already purchased?

The License Key is used only for license verification and is not included in URLs or anonymous file-open metrics.

Find your License Key in Lemon Squeezy My Orders or your receipt email.

License and payment details

CSV Export — US$19.00. CSV files only; existing CSV Export customers keep this license.

CSV & Repaired C3D Export — US$39.00. CSV files and repaired C3D output for new customers.

Repaired C3D Export Upgrade — US$20.00. Adds repaired C3D output for customers with a valid CSV-only License Key.

Repair compatibility: Repaired C3D output is available only after ArkC3D successfully completes a supported repair. A license does not make unsupported or unrepairable files repairable. Test a specific damaged file before purchasing for that file.

Pay once; there is no subscription. Each license has no scheduled expiration. A license is granted to one natural person, who may use it on multiple personal computers and browsers; sharing or transferring the key is not permitted.

Online License Key verification is required for each export and depends on ArkC3D and its licensing infrastructure. Payment is handled by Lemon Squeezy. C3D files and export contents remain in your browser and are not sent to the payment or license verification service.

ArkC3D TermsRefund Policy

Purchase complete

Your License Key is being issued.

Complete setup

Issuing your License Key…

Confirm repair compatibility before purchase

Repaired C3D export requires a successful supported repair.

Test the file first

ArkC3D repairs only supported C3D issues. Buying a license does not make an unsupported or unrepairable file repairable.

If repaired output for a specific damaged file is your reason for purchase, cancel this checkout and test that file first. Opening, supported repair, and reviewing the repaired copy are free.