Exhibit 32.1

CERTIFICATION

PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Kumarakulasingam Suriyakumar, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report of ARC Document Solutions, Inc. (the “Company”) on Form 10-Q for the period ended June 30, 2024 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that the information contained in such report fairly presents in all material respects the financial condition and results of operations of the Company.

Date: August 8, 2024

/s/ KUMARAKULASINGAM SURIYAKUMAR

Kumarakulasingam Suriyakumar

Chairman and Chief Executive Officer (Principal Executive Officer)