# Guides

- [How to merge 2 or more PDFs into one file](https://pdfnest.co.in/guides/how-to-merge-pdf-files): A simple step-by-step guide to merging 2 or more PDFs into one file on Android, iPhone, Windows and Mac — free and without installing anything.
- [How to reduce PDF size for online forms (100 KB, 200 KB and more)](https://pdfnest.co.in/guides/how-to-reduce-pdf-size): Learn how to compress a PDF under 100 KB, 200 KB or any limit for exam, job and government form uploads — free, on phone or computer.
- [How to convert photos (JPG) to PDF on your phone](https://pdfnest.co.in/guides/how-to-convert-jpg-to-pdf-on-phone): Turn photos from your gallery into a PDF on Android or iPhone in under a minute — free, no app needed, with a size limit option for forms.
- [How to split a PDF into multiple files](https://pdfnest.co.in/guides/how-to-split-a-pdf): Three easy ways to split a PDF: by page ranges, every page, or equal parts — plus how to save just one page. Free and private.
- [How to sign a PDF online without printing](https://pdfnest.co.in/guides/how-to-sign-a-pdf-online): Add your signature to a PDF without printing or scanning. Draw, type or upload your signature, place it and download — on phone or computer.
- [Are online PDF tools safe to use?](https://pdfnest.co.in/guides/are-online-pdf-tools-safe): What happens to your files when you use an online PDF tool, the risks of uploading private documents, and how browser-based tools keep files on your device.