Every free PDF tool works the same way — upload your file, wait, download it back. PDF Engineer does the opposite. Compress, merge, split, edit, redact, OCR, and sign PDFs and images entirely inside your browser using WebAssembly. Nothing ever uploads, no matter the file size, and no account is required. Built after one too many times hesitating before uploading a contract or ID to a stranger's server. Open DevTools while using any tool — zero network requests, verified every time.