A phone camera is often the fastest scanner you own. It works for forms, signed papers, IDs, receipts and notes. The problem is that raw phone photos are not document files. They may be sideways, shadowed, huge in file size or mixed out of order.

A clean PDF should be readable first and small second. The recipient needs to zoom in on text, print the file if needed and upload it without hitting a file limit.

Before merging, review each image. Rotate pages upright, crop away desks and backgrounds, and remove duplicate shots. If a page is blurry, retake it instead of trying to rescue it later. Compression cannot fix an unreadable source image.

Resize large phone scans to a practical size. A long edge around 1800 to 2400 pixels is often enough for readable text while keeping the PDF manageable. For very small text, use a larger size and less compression.

Sort the images before creating the PDF. For multi-page forms, use the natural page order. For receipts, use date order. For ID documents, put front and back next to each other. A little ordering prevents confusion later.

Because the PDF is generated locally in the browser, sensitive scans do not need to be uploaded to an unknown converter. Still, review the final PDF before sending and keep the originals until the submission is accepted.