PDF Tools

PDF Tools is an offline PDF utility app for Android that covers merging, splitting, rotating, page extraction, and JPG/PNG-to-PDF conversion without uploading documents. The premium unlock adds watermarks, page numbers, headers, and custom font sizing, which handles most basic document cleanup tasks on a phone. It's not a full Acrobat replacement, but it's close enough for everyday paperwork.

PDF Tools Premium: What the Unlocked Tier Adds

The premium tier unlocks the full page range selector when splitting, so you can pick page 3 through 9 instead of only isolated pages. It also removes the output file limit on merged files, which matters if you're combining a semester's worth of lecture slides into one reference PDF. I found the page-numbering tool accurate even when the source scan had uneven margins, a small detail that matters when you're preparing print-ready contracts.

Extracting a single page from a lengthy manual takes two taps: open the document, pick the page, export. Rotation applies to individual pages or the entire file, and the lock/unlock feature handles password protection. In my testing, the merge order controls behaved predictably—drag to reposition, hit save, and nothing shifts out of order.

Practical Limits and Honest Drawbacks

The app doesn't do OCR, so a scanned PDF stays as an image even after you unlock premium. You also can't add digital signatures or fill interactive form fields, which limits usefulness for legal paperwork. The watermark tool works, but it only places text on top of pages; there's no image watermark option. That's a real limitation. The app targets Android 7.0 and newer, so older devices won't pass the compatibility check.

If your workflow involves heavy annotation or redaction, you'll need a desktop editor instead. The software also gets sluggish with large files—a 300-page scanned contract slowed down noticeably on a mid-range phone. Free users hit an output limit on merged files, and while the premium unlock removes that, you'll still see occasional stutters when converting high-resolution images. Because this is a sideloaded build, scan the APK with antivirus before installing and check for updates manually—it won't self-update.

Who Should Skip This App

People who need editable PDF forms, digital signatures, or OCR should look elsewhere—this is a file organizer, not a document creation suite. Students who want to merge PDF files on Android for lecture notes and receipts will get more value from this tool than office workers handling complex contracts. It's best suited for occasional use, not daily heavy lifting.

Frequently Asked Questions

Does PDF Tools work offline?

Yes, all core functions process files locally on your device, so no internet connection is needed.

Can multiple JPG images be combined into a single PDF?

You can select several images and combine them into one PDF during the conversion step.

Is the premium unlock permanent?

It stays active for all future sessions after you install the unlocked version, though replacing the APK with a newer release might reset it.