<DOCUMENT>
<TYPE>EX-99.CERT
<SEQUENCE>2
<FILENAME>a2160898zex-99_cert.txt
<DESCRIPTION>EX 99.CERT
<TEXT>
<Page>

                                                                 Exhibit 99.CERT

I, Alvin R. Albe, Jr., certify that:

     1. I have reviewed this report on Form N-CSR of TCW Convertible Securities
        Funds, Inc.;

     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 report;

     3. Based on my knowledge, the financial statements, and other financial
        information included in this report, fairly present in all material
        respects the financial condition, results of operations, changes in net
        assets, and cash flows (if the financial statements are required to
        include a statement of cash flows) of the registrant as of, and for, the
        periods presented in this report;

     4. The registrant's other certifying officers and I are responsible for
        establishing and maintaining disclosure controls and procedures (as
        defined in Rule 30a-3(c) under the Investment Company Act of 1940) for
        the registrant and 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 report is being prepared;

        (b)  evaluated the effectiveness of the registrant's disclosure controls
             and procedures and presented in this report our conclusions about
             the effectiveness of the disclosure controls and procedures, as of
             a date within 90 days prior to the filing date of this report based
             on such evaluation; and

        (c)  disclosed in this report any change in the registrant's internal
             control over financial reporting that occurred during the
             registrant's most recent fiscal half-year (the registrant's second
             fiscal half-year in the case of an annual report) 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 officers and I have disclosed to the
        registrant's auditors and the audit committee of registrant's board of
        directors (or persons performing the equivalent functions):

        (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 control over financial reporting.


Date: September 7, 2005
                                            /s/ Alvin R. Albe, Jr.
                                    --------------------------------
                                    Alvin R. Albe, Jr.
                                    Chief Executive Officer

<Page>

I, David S. DeVito, certify that:

     1. I have reviewed this report on Form N-CSR of TCW Convertible Securities
        Funds, Inc.;

     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 report;

     3. Based on my knowledge, the financial statements, and other financial
        information included in this report, fairly present in all material
        respects the financial condition, results of operations, changes in net
        assets, and cash flows (if the financial statements are required to
        include a statement of cash flows) of the registrant as of, and for, the
        periods presented in this report;

     4. The registrant's other certifying officers and I are responsible for
        establishing and maintaining disclosure controls and procedures (as
        defined in Rule 30a-3(c) under the Investment Company Act of 1940) for
        the registrant and 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 report is being prepared;

        (b)  evaluated the effectiveness of the registrant's disclosure controls
             and procedures and presented in this report our conclusions about
             the effectiveness of the disclosure controls and procedures, as of
             a date within 90 days prior to the filing date of this report based
             on such evaluation; and

        (c)  disclosed in this report any change in the registrant's internal
             control over financial reporting that occurred during the
             registrant's most recent fiscal half-year (the registrant's second
             fiscal half-year in the case of an annual report) 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 officers and I have disclosed to the
        registrant's auditors and the audit committee of registrant's board of
        directors (or persons performing the equivalent functions):

        (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 control over financial reporting.


Date: September 7, 2005
                                            /s/ David S. Devito
                                    ------------------------------
                                    David S. DeVito
                                    Chief Financial Officer
</TEXT>
</DOCUMENT>
