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You can retrieve the result of a previously-scheduled validation run by entering its key here:

(E.g., 7bf66904-7d67-49bb-9127-bee77a8f96ba)

This tests the syntax and internal consistency of an SBML file. Passing this validator does not guarantee correctness, but it's the best automated assessment available.

Use the form below to upload your SBML content. You can also access this service via a network API. By using any part of this service, you agree to the terms of the privacy notice.

Select an SBML file located on your computer. The file can be
uncompressed, or compressed using zip, gzip or bzip2.
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Select an SBML file located on your computer. The file can be
uncompressed, or compressed using zip, gzip or bzip2.
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e.g. C\:Program Files\SBML\MyModels\l2v1-branch.xml Schedule for
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Type the URL of an SBML file located on another computer. Example:
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fill out the following CAPTCHA or register yourself with this service to skip this step.

Paste or type SBML content directly into the text window below.

Validation options:

Check consistency of measurement units associated with quantities (SBML L2V4 rules 105nn)

Check correctness and consistency of identifiers used for model entities (SBML L2V4 rules 103nn)

Check syntax of MathML mathematical expressions (SBML L2V4 rules 102nn)

Check validity of SBO identifiers (if any) used in the model (SBML L2V4 rules 107nn)

Perform static analysis of whether the model is overdetermined

Perform additional checks for recommended good modeling practices

Perform all other general SBML consistency checks (SBML L2V4 rules 2nnnn; highly recommended)

Ignore SBML Level 3 packages that are not officially finalized

The file has been uploaded to the server and is now validating. This operation will time out in 60 seconds.


The file is being submitted to the server and the validation is queued, you will receive your link shortly.


The SBML pasted is probably invalid. We expect at least an SBML tag.

Please paste some SBML prior to running the validation.

This validator supports all specifications of SBML through Level 3 Version 2 Core (Release 1), as well as all Level 3 packages for which specifications exist. The validator supports the COMBINE Archive (see potential restrictions here).

Limitations: (1) For SBML Level 3 packages that have not been finalized, validation is limited to XML syntax only; consequently, a model may have other errors in its use of Level 3 package constructs yet still pass this validator. (2) SBML <annotation> element content is always only checked for proper XML syntax; the content of annotations is not validated; consequently, a model may have errors in its annotations yet still pass this validator. (3) The maximum file size allowed is 32 megabytes (compressed or uncompressed).

The change log summaries recent changes made to the Online SBML Validator.

This facility is the work of Frank T. Bergmann, Michael Hucka, Benjamin J. Bornstein, and Akiya Jouraku. It is an interface to the validation engine built into libSBML 5.20.2. This version of the validator uses the XML parser library " libxml ".

Please report any problems