Add 16 premium credits to your GPT Watermarker wallet. Supported hidden-watermark jobs use 1 credit at Standard quality or 2 at HD quality. Top-up credits do not unlock unlimited regular removals or increase video duration limits. Credits expire 90 days after your last credit grant; another grant renews that window. Purchase from your signed-in account at https://gptwatermarker.com so the credits reach the correct account.