1. Good light, flat page
Put the page on a dark, flat surface in even light. Avoid shadows across the text.
2. Check each page
Adjust the corners if the edge was missed, then add the next page.
3. Make it searchable
Send the PDF to OCR PDF to add a hidden text layer, so you can search and copy the text. English, French and Arabic are supported.
Good to know
No app is needed: the camera opens in your browser. Shadows and curled pages are the main causes of poor scans.
Questions
Are my scans uploaded?
No. Edge detection and straightening run on your phone.
Related: Convert a PDF to an editable Word file · Make a scanned PDF searchable · Convert PDF tables to Excel