sakuttoAI is a free suite of around 90 online tools for the small, repetitive tasks that interrupt real work: compress, merge and split PDFs, convert and edit images (HEIC to JPG, WebP, resize, background removal), count characters, diff text, format JSON, convert CSV to Excel, and more. Most tools run right in your browser. Text tools need no account; file tools need a free, email-only sign-up. Available in English and Japanese.
