How to use PDF Viewer
A complete, step-by-step guide from opening your first PDF to editing, signing and sharing. It takes about five minutes to read.
Quick start
Six steps from install to your first edited PDF.
Install and open the app
Install PDF Viewer from Google Play and open it. The home screen shows an Open PDF button, quick tools and your recent files. No account or sign-in is needed.
Allow file access (optional)
Open the Gallery tab and tap Allow access so the app can list every PDF on your phone. Prefer not to? Tap Choose folder and pick the folders you want, or simply open files from your file manager.
Open a PDF
Tap Open PDF on Home, pick a file from the Gallery, or open any PDF from your file manager, browser, e-mail or WhatsApp and choose PDF Viewer.
Read comfortably
Swipe to scroll, pinch or double-tap to zoom. Use the bottom bar: Pages, Search, Edit, the theme button (Day / Night / Sepia) and Reading for scroll or Book mode, brightness and keep-screen-on.
Mark up and sign
Tap Edit, pick a tool (Pen, Marker, Text, Box, Oval, Line, Arrow, Eraser, Sign or Image), draw on the page and tap Save. A new copy appears in the Output tab.
Use the Tools tab
Open Tools for Scan, Image to PDF, Merge, Split, Organize pages, Watermark, Page numbers, Compress, Protect, Unlock, PDF to images and Extract text. Choose a file, set options, and tap the button at the bottom.
Reading & searching
Zoom and move
Pinch to zoom up to 6×, double-tap to zoom in or out, drag to pan. A short pause after zooming re-sharpens the text.
Search
Tap the search icon, type at least two letters and use the arrows to step through matches. Tap the results list for snippets.
Reader → SearchBookmarks and contents
Tap the bookmark icon to save a page. Open Pages to see thumbnails, the table of contents and all bookmarks.
Reader → PagesCopy or highlight text
Long-press a word, drag to extend, then choose Copy, Highlight, Underline or Strikethrough.
ReaderMore options
The ⋮ menu has Go to page, Read aloud, Auto scroll, Text view, Favorite, Share, Print and Document info.
Reader → ⋮Annotating & signing
Draw and write
In Edit mode choose Pen or Marker, pick a color and thickness, and draw. Tap Text then tap the page to type a note.
EditMove and resize
Choose Select, tap a note, image or shape, drag to move and drag the round handle at the corner to resize. Use the buttons to duplicate or delete.
Edit → SelectCreate a signature
Tap Sign → New signature, sign with your finger, tap Use. It is saved for next time and appears in the middle of the page ready to place.
Edit → SignSave
Tap Save, name the file and confirm. The edited copy opens automatically and is stored in Output.
Edit → SaveScanning & Image to PDF
Scan a document
Tools → Scan. Point the camera at the paper, adjust the corners if needed, add more pages, then save.
Tools → ScanImage to PDF
Tools → Image to PDF → add photos. Tap a photo to rotate it, apply a filter or move it earlier / later. Choose page size, orientation, margin and quality, then Create PDF.
Tools → Image to PDFMerge, split & organize
Merge
Tools → Merge. Add PDFs, use the arrows to set the order and tap Merge.
Tools → MergeSplit or extract
Tools → Split. Use Extract pages (tick thumbnails or type 1-3, 5), Every N pages or Custom ranges for several files.
Tools → SplitOrganize pages
Tools → Organize pages. Tap a thumbnail then rotate, move left or right, duplicate or delete. Save when finished.
Tools → Organize pagesCompress & protect
Compress
Choose Light, Balanced, Strong or Maximum. Try Balanced first. Maximum makes the smallest file but turns pages into images, so text can no longer be selected.
Tools → CompressProtect with a password
Enter a password twice (at least 4 characters), choose what is allowed and tap Protect PDF. Keep the password safe — it cannot be recovered.
Tools → ProtectUnlock
Pick the protected file, enter its password and create an unlocked copy.
Tools → UnlockApp lock
Turn on App lock in Settings to require fingerprint, face or screen lock when the app opens.
Settings → PrivacyFiles, Output & settings
Gallery
Switch grid or list, sort, search, filter by folder chips and long-press to select multiple files.
GalleryOutput PDFs
Open, rename, share or delete anything the app has created. Files live in Documents/PDF Viewer so other apps and your file manager can see them too.
OutputSettings
Choose Light / Dark theme, language, default view mode and reading theme, keep-screen-on, sharp zoom, app lock and clear recent files or cache.
Home → gear iconTroubleshooting
The gallery is empty
Tap Allow access on the Gallery tab and enable “Allow access to manage all files”, or add a folder with Choose folder. Then pull back to the app — it refreshes automatically.
“This PDF is password protected” in a tool
Use Tools → Unlock first, then run the tool on the unlocked copy. In the reader you can enter the password directly.
I can’t select or search text
The PDF is probably a scan (pictures only). PDF Viewer does not do OCR yet, so there is no text layer to select.
Compress says the file is already optimized
The images inside are already small. Try a stronger level, or Maximum if you don’t need selectable text.
Scan is not available
The scanner needs Google Play services. Update or enable Google Play services and the Play Store, then try again. Image to PDF works without it.
The page looks blurry while zooming
Wait a moment — sharp tiles render after you stop. Make sure Sharp zoom is on in Settings → Reading.
Still stuck?
Send us a bug report with your phone model and Android version, or write to support@fireclashpro.com.
Questions?
Check the FAQ or write to us — we read every message.
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