On-device iPhone app that writes a new JPEG or flattened PDF copy under a typed 10 KB-100 MB maximum and measures the file on disk. If the cap is not reachable it says so. No account, no cloud, original untouched. $6.99 CAD one-time.
Upload forms often reject files over a fixed size limit, and existing compressors either need a cloud upload or only guess at the final size. I wanted an iPhone tool that hits a typed KB cap on-device and confirms the actual size on disk, without touching the original file.