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How to merge, compress and edit PDFs on your phone
The form wants one PDF under a size limit, and you have four photos of pages and a file that will not upload. A PDF app on your phone fixes that in a couple of minutes: combine, shrink, reorder and send, without hunting for a laptop.
A step-by-step routine, then PDF apps. For contracts and IDs, prefer apps that process files on the device or that you trust with personal documents.
Merge files into one
Select the files or scanned pages in a PDF app and combine them in the order the recipient expects. Check page orientation before saving. For turning paper into PDFs, see how to scan documents with your phone.
Shrink files that are too big
Use the compress option and pick a quality level that keeps text readable. Check the result before sending; scanned pages at very low quality can become unreadable.
Tidy and annotate
Rotate, reorder and delete pages, then add text, highlights or comments where needed. To sign, see how to sign a document on your phone.
Keep personal files private
For IDs, contracts and medical papers, choose apps that work on the device or that you trust, and add a password when sending sensitive files. Compare apps in PDF apps.
| Task | What you do | Why |
|---|---|---|
| Merge | combine files into one PDF | one upload, right order |
| Compress | reduce file size | fits upload limits |
| Reorder pages | move, rotate, delete | clean document |
| Annotate | add text, highlights, notes | fill and comment |
| Protect | password or on-device apps | private files stay private |
Frequently asked questions
How do I merge PDFs on my phone?
Open a PDF app, select the files or pages, arrange them in order and save them as one PDF.
How do I make a PDF smaller?
Use a compress option in a PDF app and check that text is still readable afterwards.
Is it safe to upload PDFs to online tools?
For personal documents, prefer apps that process files on your device or services you trust.