What is the simplest free way to read a PDF on Android?

Tap a PDF in Files, Gmail, or a messaging app — Android opens it with whichever default PDF viewer you have set, typically Google Drive’s viewer on stock Android or a vendor viewer on Samsung/Xiaomi/etc. The default viewer renders the file at high quality, supports search and share, and requires no extra install. If you read PDFs constantly, install a dedicated app (Xodo or Foxit) for a more capable library and annotation experience. So: default viewer for quick reads; install Xodo or Foxit for daily use.

Which free app handles annotation best?

Xodo and Foxit lead the free annotation field on Android: highlight, underline, strike-through, freehand drawing with stylus (S-Pen on Samsung), sticky notes, and text boxes — all without a subscription. Both save annotations into the PDF so any other reader sees them. On Samsung devices, Samsung Notes is excellent for stylus markup but limited for structured PDF form work. Avoid apps that lock annotation save behind a paid tier. So: Xodo or Foxit for free annotation; Samsung Notes for S-Pen markup on Samsung; check that "save" is free before committing to an app.

Can I fill PDF forms on Android for free?

Yes — Adobe Reader, Xodo, and Foxit all support AcroForm fill in their free tiers. Tap into a field, type with the on-screen keyboard, tap next field, save. For PDFs that are scanned static images with no form fields, you need the text-overlay tool (Xodo and Foxit both have it) which lets you place a text box anywhere on the page. After filling, share the PDF via the share sheet. So: Adobe / Xodo / Foxit all fill forms free; use text-overlay for scanned static forms.

How private are these apps with my files?

Mixed and worth checking. Apps with cloud sync (Adobe Acrobat, WPS) typically upload files to their servers unless you disable sync; the “Data shared with third parties” section on each Play Store listing is now required and lists what each app collects. Xodo and Foxit can operate fully offline. Browser-based tools like ScoutMyTool process files in your browser tab on your device — nothing leaves Android. For sensitive documents, prefer offline apps or in-browser tools, and read the Play Store data-safety disclosure before installing. So: check Play Store data-safety disclosure; offline-capable apps and browser tools are safer for sensitive files.

Can I merge or split PDFs on Android without paying?

Free merge/split is patchy in native Android apps — most lock these behind a paid tier. The reliable free route is a browser-based tool like ScoutMyTool in Chrome or Firefox: works on Android, no install, no upload, full merge/split. Xodo offers basic merge free; Foxit pushes its paid plan for it. If you need merge/split rarely, the browser is the path of least resistance. So: browser tools are the cleanest free merge/split route on Android.

How does ScoutMyTool compare to a native Android app?

Trade-offs both directions. Native apps win on offline use, S-Pen depth (Samsung), and library management. ScoutMyTool wins on no-install, broad tool coverage (merge, split, compress, convert, sign, annotate, redact, etc.) in one place, and a privacy posture that does not require trusting an app’s sync defaults. If you read PDFs all day, install Xodo or Foxit; if you reach for PDF tools occasionally or care strongly about not uploading, the browser is the better path. So: native for daily reading; browser for occasional or privacy-first work.

Be wary of apps that require a sign-up before opening any PDF, apps that “process” files in the cloud without saying so up front, and apps with very few reviews and aggressive permission requests (camera, contacts) that have nothing to do with PDFs. The Play Store data-safety section is required and includes a list of data collected and shared — read it. A genuinely useful free PDF app should open, read, and let you annotate without an account. So: skip sign-up-to-open apps, upload-to-process apps, and apps requesting unrelated permissions.

Best free PDF apps for Android (2026 review)

By ScoutMyTool Editorial Team · Last updated: 2026-05-23

Android’s PDF app market in 2026 is busy and a bit noisy — the same names you saw five years ago are still here, plus a wave of newer apps competing on freemium features and a few outright spyware-adjacent listings worth avoiding. This review walks the apps worth installing for reading, annotating, filling forms, and light editing, and covers the no-install browser route for the cases where you do not want anything new on your phone at all.

The shortlist

App	Strengths	Trade-offs
Google Drive viewer	Pre-installed on most Android; clean reading	View-only; uploads if not already in Drive
Adobe Acrobat Reader	Forms, signatures, cross-device sync	Account required; cloud defaults
Xodo	Free annotation, form fill, sign — no subscription	Ads in some flows
Foxit PDF Reader	Fast renderer, annotation, fill-and-sign	Pushes paid upgrades
Samsung Notes (Samsung devices)	Excellent S-Pen markup; built-in	Samsung-only; limited form fill
ScoutMyTool (Chrome / Firefox)	No install; full tool set; files stay on-device	Needs a browser tab; limited offline
WPS Office (PDF mode)	PDF + office in one; lots of free features	Heavy app; ad-supported

How to pick

Read-only? The built-in default viewer (Google Drive viewer on stock Android) is fine.
Annotation, free? Xodo or Foxit; Samsung Notes if you have an S-Pen.
Form fill, free? Adobe Reader, Xodo, or Foxit — all support AcroForm fields.
Merge / split / convert occasionally? ScoutMyTool in Chrome — no install, no upload.
Sensitive files? Offline-capable apps (Xodo / Foxit with sync off) or browser tools.
Read Play Store data-safety. Required disclosure of what each app collects and shares.
Avoid: sign-up-to-open apps, upload-to-process flows, apps asking for unrelated permissions.

PDF reader for Android (primer).
Best PDF viewers (cross-platform).
Best free PDF tools 2026: broader landscape.
Best free PDF apps for iPad (2026).
Sign PDF: signature workflows.
All ScoutMyTool PDF tools (works in Android Chrome).

FAQ

What is the simplest free way to read a PDF on Android?: Tap a PDF in Files, Gmail, or a messaging app — Android opens it with whichever default PDF viewer you have set, typically Google Drive’s viewer on stock Android or a vendor viewer on Samsung/Xiaomi/etc. The default viewer renders the file at high quality, supports search and share, and requires no extra install. If you read PDFs constantly, install a dedicated app (Xodo or Foxit) for a more capable library and annotation experience. So: default viewer for quick reads; install Xodo or Foxit for daily use.
Which free app handles annotation best?: Xodo and Foxit lead the free annotation field on Android: highlight, underline, strike-through, freehand drawing with stylus (S-Pen on Samsung), sticky notes, and text boxes — all without a subscription. Both save annotations into the PDF so any other reader sees them. On Samsung devices, Samsung Notes is excellent for stylus markup but limited for structured PDF form work. Avoid apps that lock annotation save behind a paid tier. So: Xodo or Foxit for free annotation; Samsung Notes for S-Pen markup on Samsung; check that "save" is free before committing to an app.
Can I fill PDF forms on Android for free?: Yes — Adobe Reader, Xodo, and Foxit all support AcroForm fill in their free tiers. Tap into a field, type with the on-screen keyboard, tap next field, save. For PDFs that are scanned static images with no form fields, you need the text-overlay tool (Xodo and Foxit both have it) which lets you place a text box anywhere on the page. After filling, share the PDF via the share sheet. So: Adobe / Xodo / Foxit all fill forms free; use text-overlay for scanned static forms.
How private are these apps with my files?: Mixed and worth checking. Apps with cloud sync (Adobe Acrobat, WPS) typically upload files to their servers unless you disable sync; the “Data shared with third parties” section on each Play Store listing is now required and lists what each app collects. Xodo and Foxit can operate fully offline. Browser-based tools like ScoutMyTool process files in your browser tab on your device — nothing leaves Android. For sensitive documents, prefer offline apps or in-browser tools, and read the Play Store data-safety disclosure before installing. So: check Play Store data-safety disclosure; offline-capable apps and browser tools are safer for sensitive files.
Can I merge or split PDFs on Android without paying?: Free merge/split is patchy in native Android apps — most lock these behind a paid tier. The reliable free route is a browser-based tool like ScoutMyTool in Chrome or Firefox: works on Android, no install, no upload, full merge/split. Xodo offers basic merge free; Foxit pushes its paid plan for it. If you need merge/split rarely, the browser is the path of least resistance. So: browser tools are the cleanest free merge/split route on Android.
How does ScoutMyTool compare to a native Android app?: Trade-offs both directions. Native apps win on offline use, S-Pen depth (Samsung), and library management. ScoutMyTool wins on no-install, broad tool coverage (merge, split, compress, convert, sign, annotate, redact, etc.) in one place, and a privacy posture that does not require trusting an app’s sync defaults. If you read PDFs all day, install Xodo or Foxit; if you reach for PDF tools occasionally or care strongly about not uploading, the browser is the better path. So: native for daily reading; browser for occasional or privacy-first work.
Any apps to avoid?: Be wary of apps that require a sign-up before opening any PDF, apps that “process” files in the cloud without saying so up front, and apps with very few reviews and aggressive permission requests (camera, contacts) that have nothing to do with PDFs. The Play Store data-safety section is required and includes a list of data collected and shared — read it. A genuinely useful free PDF app should open, read, and let you annotate without an account. So: skip sign-up-to-open apps, upload-to-process apps, and apps requesting unrelated permissions.

Citations

Wikipedia — “Android (operating system).” en.wikipedia.org/wiki/Android_(operating_system)
Wikipedia — “Google Drive” (built-in PDF viewer on Android). en.wikipedia.org/wiki/Google_Drive
Wikipedia — “PDF” (forms, annotations, structure). en.wikipedia.org/wiki/PDF

No-install PDF tools, right in Chrome

ScoutMyTool runs in your Android browser — merge, split, compress, fill, sign, redact — and your files never leave the device.

Open PDF tools →