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X_T Viewer Online: Open Parasolid Files & Measure CAD

Open Parasolid X_T files online in a browser, inspect solid geometry, check dimensions and properties, and convert validated models to STEP after registering or signing in. Viewing does not require an account.

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Capabilities and limits

  • Open supported Parasolid X_T and X_B files for browser inspection and convert complete, valid reconstructed source geometry to STEP after signing in.
  • Display point distances and recovered mesh volume are approximate. B-Rep properties and supported edge or face measurements depend on readable reconstructed geometry; exact STEP export requires complete, valid source B-Rep.
  • Files are uploaded for server processing; support depends on format, version and geometry.
  • Viewing and measuring do not require an account. Sign in to convert, save files across devices or create share links.
On this page

Open a Parasolid X_T or X_B file without installing the originating CAD application. Upload the original file, inspect the geometry and warnings, then check units and loaded bodies before choosing a STEP handoff. Viewing does not require an account; files are uploaded for server processing.

What is X_B? X_T versus X_B

X_T is the text encoding of Parasolid model data; X_B is its binary form. Both can describe bodies, surfaces and topology. Binary encoding does not by itself make geometry more accurate or restore a native feature tree. Keep the original extension: renaming X_B to X_T does not convert its contents.

How to open an X_B file online

  1. Select the original .x_b or .x_t file in the upload panel.
  2. Wait for processing, then rotate, zoom and fit the model in the workspace.
  3. Read completeness and unit notices. Compare a known dimension and the expected body count with the sender's information.
  4. If geometry is missing or the encoding is unsupported, ask for a fresh X_T or STEP export from the source application.

Check geometry before using measurements

A successful preview is only the first check. Confirm the expected bodies, source scale and overall X/Y/Z extents. Parasolid coordinates follow a metre convention and are normalized to millimetres for display. Compare a known length before using properties. An incomplete result describes only geometry that loaded.

Measure the model, not the screenshot

Read the reported representation and calculation method. Display uses triangles, while readable reconstructed B-Rep can provide geometry properties and supported edge or face measurements. Point distances picked on the display mesh are approximate. A closed display mesh can also have recovered approximate volume even when the source contains sheet bodies with zero solids; the warning and method identify that fallback. Do not report it as source solid volume. Surface area uses B-Rep geometry when available. Mass additionally needs a confirmed density; model dimensions do not establish manufactured tolerances.

Convert X_T or X_B to STEP

After inspection, sign in, open Convert and choose STEP for the Parasolid source. Exact STEP export requires complete, valid reconstructed source B-Rep; an incomplete preview is not enough and export is refused when required geometry cannot be rebuilt. Sheet bodies remain surfaces rather than becoming solids just because they look closed on screen. Reopen the downloaded STEP in the receiving CAD system and compare units, bodies and critical geometry. Conversion does not restore modeling history. The Parasolid-to-STEP tool uses the same workspace conversion controls.

Know the compatibility boundary

Parasolid versions, geometry and binary machine encodings vary. Supported X_B encodings include neutral binary and bounded ASCII/IEEE bare-binary streams; legacy VAX floating-point and EBCDIC character encodings are not implemented. Unsupported surfaces, invalid geometry and resource limits can cause omissions or an error. Read every warning, keep the original unchanged and ask for the exporting application/version or a fresh X_T or STEP export when necessary.

Input formats: X_T, X_B

Open this tool

General steps for uploading, viewing, sectioning, measuring, converting and exporting are explained once in How it works. This page covers what is specific to this file type.

Real CADProps screenshots

The screenshots show the English interface. Captions and instructions describe the same operations.

English CADProps workspace displaying a binary X_B rounded box with zero source solids and a recovered-volume warning
Binary Parasolid X_B opened locally: 20 × 20 × 20 mm, seven source faces and zero source solids. The volume and mass shown are approximate values recovered from the display mesh, as the warning states; they are not source solid properties. Area uses reconstructed B-Rep. This screenshot does not prove STEP export. Sample: Ansys pyansys-geometry BoxWithRound · MIT licence notice. Screenshot: CADProps.

Sample source and verification

When a result needs another check

Viewing can start without an account. Conversion, account storage and share creation require signing in. Temporary files expire after the displayed retention period. Read the privacy statement for server processing and deletion, and the accuracy notes before using numerical results. Do not assume that hiding a part, clipping it or exploding an assembly changes the exported source geometry.

When a result needs another check · Input formats

Continue with a related task

Original article: CADProps · https://www.cadprops.com/tools/parasolid-viewer/

A reproducible example

The MIT-licensed Ansys BoxWithRound X_B sample opens with 20 × 20 × 20 mm bounds, seven faces and zero source solids. The reported volume is approximate recovered mesh volume; area uses reconstructed B-Rep. Viewing does not prove exact export.

Repository-generated samples are synthetic test models. Verify your own model's units and geometry before using results.

Supported formats
All formats and limits →

Questions about this task

Can I open an X_T file online without Parasolid software?

Yes, for supported X_T text and X_B binary Parasolid files. Upload the original, inspect warnings and compare a known dimension. Files are processed on the server.

Does CADProps support X_B files?

Yes. X_B is binary Parasolid; X_T is the text encoding. Upload the original X_B without renaming it. Supported encodings and geometry are limited; legacy VAX and EBCDIC encodings are not implemented.

Can I measure an X_T file?

Readable reconstructed B-Rep can provide geometry properties and supported edge or face measurements. Point distances on the display mesh and recovered mesh volume are approximate. Confirm source units, loaded scope and the reported method; recovered mesh volume is not source solid volume.

Can I convert X_T or X_B to STEP?

Yes, after signing in, if the reconstructed source B-Rep is complete and valid. Incomplete or invalid geometry is refused. Sheet bodies stay surfaces; reopen the STEP to check units and bodies.

Do I need an account?

View and measure without an account. Register or sign in to convert, save files and create share links. Recipients can view shared models without an account. Guest files remain temporary.

Related reading

Checks that help with this file.

All guides →
Opening files

How to Open an X_T File Online Without Parasolid Software

Open Parasolid X_T files online, verify the source model and units, measure readable geometry, and know when to convert the file to STEP.

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Parasolid vs STEP: Which CAD Exchange File to Send

Parasolid (X_T, X_B) or STEP (STP)? Choose by the receiving application and the data the handoff needs, not by assuming one extension always converts better.

Read the guide →File formats

IGES vs Parasolid: Surfaces, Solids and CAD Exchange

Compare IGES and Parasolid X_T by the receiving system, solid closure and units. Neither extension guarantees a perfect transfer or a native feature tree.

Read the guide →