300 KB is a very tight target. Use it only when the upload workflow asks for a file around that size, and review the prepared result carefully because small scans and photos can lose detail quickly.
When 300 KB helps
A 300 KB target can help with short scanned pages or small supporting PDFs when the upload screen gives you that kind of limit. Do not assume the same target applies to every upload. Use the number shown in your own workflow.
Prepare first
Review pages, delete extras, rotate pages that are sideways, and avoid adding photos that do not belong in the final upload. If the document needs a visible signature, add it before preparing so you review the real final content.
Readability risk
A PDF can reach 300 KB and still be too hard to read. Open the preview, zoom into small text, and check whether photos or scans still show the information the destination expects.
When not to force it
Smaller is not always better. If the destination allows 500 KB, 1 MB, or 2 MB, a larger target may preserve readability without hurting the upload task.
Related workflow
Use exact size targets, then review before export. If the file is scanned, use OCR only when searchable or selectable text is needed. Privacy context: no-upload PDF prep.
Boundary: PDF contents are prepared on your phone and are not uploaded to PDF Ready servers. PDF Ready prepares the file for the target you choose, but the destination portal has the final say.