KeepSimp is 71 free tools that run in your browser, so your files never leave your device. Edit the words in a PDF, sign, fill and redact it; convert, trim and compress video; clean up and transcribe audio; take the background out of a photo; format JSON, test APIs and write code; plus calculators, a typing test and games. No account, no sign-up and nothing uploaded. It installs as an app and works offline once installed.