Exhibit 31.1



CERTIFICATION PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002



I, Alan M. Meckler, certify that:



1. I have reviewed
this quarterly report on Form 10-Q of Jupitermedia Corporation;



2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not
misleading with respect to the period covered by this quarterly report;



3. Based on my knowledge, the financial statements, and other financial information included in this quarterly report, fairly present in all material respects the financial condition, results of operations and cash flows of the Registrant
as of, and for, the periods presented in this quarterly report;



4. The Registrants other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15 (e)) and internal control over financial
reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the Registrant and we have:



a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our
supervision, to ensure that material information relating to the Registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this quarterly report is being
prepared;



b) designed such internal control
over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for
external purposes in accordance with generally accepted accounting principles;



c) evaluated the effectiveness of the Registrants disclosure controls and procedures and presented in this quarterly report our
conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this quarterly report based on such evaluation; and



d) disclosed in this quarterly report any changes in the Registrants internal control over financial
reporting that occurred during the Registrants most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the Registrants internal control over financial reporting; and



5. The Registrants other certifying officer and I have disclosed, based
on our most recent evaluation of internal control over financial reporting, to the Registrants auditors and the audit committee of the Registrants board of directors (or persons performing the equivalent function):



a) all significant deficiencies and material weaknesses in
the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the Registrants ability to record, process, summarize and report financial information; and



b) any fraud, whether or not material, that involves
management or other employees who have a significant role in the Registrants internal controls over financial reporting.



August 9, 2005



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|/s/    Alan M. Meckler                              
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|Alan M. Meckler Chairman and Chief Executive Officer