Purpose Internet-based interventions have the potential to reduce the disparity in access to psychological therapy that people with tinnitus currently experience. One example is the Tinnitus E-Programme, which, although freely available online, has not yet been formally evaluated. The purpose of this study was to evaluate past, current, and new users' reactions and interactions with the Tinnitus E-Programme. Method Study 1 used an online survey to gather past and current users' reactions to, and interactions with, the intervention (n = 27). Study 2 used interviews and a relaxation log to assess how new users implemented the skills they learned into their everyday lives (n = 13). Results Generally, users expressed positive views on the intervention content and design features. Users particularly valued the education about tinnitus and its management and the relaxation skills training, and use of these components was high. In contrast, user reactions to self-monitoring tools, an online support forum, and therapist support were mixed, and use was lower. Implementation was limited by instances of poor usability and accessibility, user engagement, and adherence to relaxation goals. Users' perceptions of the intervention's credibility and relevance and beliefs regarding a negative impact on their tinnitus influenced engagement. Users in both studies identified several benefits gained, including functional and emotional management, self-efficacy for managing and coping with tinnitus, understanding tinnitus and its management, social support, and acceptance of tinnitus. Conclusion Findings suggest that the intervention was acceptable to its target group but also highlighted some areas for improvement. These findings will be used to inform further optimization work.