Every PDF tool.
Right on your phone.
Create, organize, convert and protect your PDFs with a clean, modern app. Your files are processed on your device, not uploaded to a server.
Simple tools.
Private by design.
Whether you are a student, a professional, or just need to sort out a document on your phone, PDF Sigma gives you the essentials in one place.
Your documents stay on your phone
PDF Sigma processes your documents on your device. Your PDF files are not uploaded to a server for processing, so what you open stays with you.
- On-device processing for your PDFs
- No account or sign-in required
- You choose where results are saved
- Share finished files straight from the result screen
Work offline, anywhere
Many PDF operations run directly on your device without cloud processing, so you can get things done on a train, on a plane, or with a weak signal.
- No upload step before you can start
- Progress shown while a task is running
- Recent files kept handy on the home screen
- Fast workflows with clear, focused screens
Clean, modern, and easy on the eyes
A minimal interface with smooth workflows makes everyday PDF tasks quick. Dark mode is included, so the app looks right at any time of day.
- Light and dark themes throughout
- All tools organized by task
- Large, readable controls
- Quick tools on the home screen
Eight tools.
One simple app.
Everything you need to create, organize, convert and secure PDFs on your phone.
Image to PDF
Turn multiple photos and images into a single PDF document.
Merge PDF
Combine multiple PDF files into one document.
Split PDF
Split a PDF by individual pages or selected ranges.
Reorder PDF
Rearrange, rotate and remove pages with ease.
PDF to Images
Export PDF pages as high-quality JPG or PNG images.
OCR
Make scanned documents searchable with text recognition.
PDF Security
Protect PDFs with a password, or remove one when you no longer need it.
PDF Viewer
Open and browse your documents in a clean, focused viewer.
A closer look at
every tool.
Clear options for each task, so you get the result you want without the clutter.
Photos to a polished PDF
Select several images, arrange them, adjust the page settings and create a PDF in a few taps.
- Choose multiple images at once
- Optional image compression for smaller files
- Page size, orientation and margin controls
- Rotate or remove individual images
Take a PDF apart and put it back together
Combine several documents into one, pull out only the pages you need, or fix the page order. Thumbnails keep you oriented at every step.
- Merge multiple PDFs into one document
- Split by selected pages or by page range
- Rearrange, rotate and remove pages
- Page thumbnails on every workflow screen
Export pages as JPG or PNG
Turn any PDF page into an image. Pick the format and quality that suits where the image is going.
- JPEG and PNG output formats
- Screen, standard and high quality options
- Export all pages, selected pages or a range
- Save everything at once or share it
Searchable when you need it, locked when you want it
Make scanned documents searchable so you can find and copy text, and protect sensitive PDFs with a password.
- OCR from images or scanned PDFs
- Password protection with AES-256 or AES-128
- User and owner passwords with permission presets
- Remove a password after verifying it
A focused place to read
Open a document and just read it. The viewer keeps the controls you need and leaves out the clutter.
- Smooth page-by-page browsing
- Thumbnail grid for quick navigation
- Page slider for long documents
- Distraction-free reading
Recent files
Jump back into the documents you used last, right from the home screen.
Light & dark theme
Both themes are designed for every screen in the app.
Progress tracking
See how far along each task is while it runs.
Share & save
Save results or share them with the Android share sheet.
Image compression
Keep PDFs made from photos smaller with one toggle.
Page settings
Set page size, orientation and margins before you export.
All tools hub
Browse every tool by category: convert, organize, extract and security.
Password check
Verify a password before removing protection from a PDF.
Done in three steps.
Every tool follows the same simple flow, so you always know what comes next.
Pick your files
Choose a tool, then select the PDFs or images you want to work with from your device.
Adjust the options
Set pages, quality, order or a password. Defaults are sensible, so you can skip straight ahead.
Save or share
Your result is ready in moments. Save it to your device or share it right away.
See it in action.
Tap any screenshot to view it full size.
Straight answers
about your data.
We keep this simple. Here is what you should know before you install.
Your PDFs are processed on your device
The documents you open, merge, split, convert or protect are handled on your phone. They are not uploaded to a server for processing.
Read the Privacy PolicyThe app contains ads
PDF Sigma shows ads, as noted on its Google Play listing. The Privacy Policy explains how ads, analytics and crash reporting work in the app.
Read the Terms & ConditionsGet PDF Sigma on Google Play.
Install the app on your Android phone and start working with your PDFs in minutes. No account, no sign-up.
- Developer
- Capricorn Lab
- Category
- Tools
- Platform
- Android
- Content rating
- Rated for 3+
- Ads
- Contains ads
Common questions,
straight answers.
Where can I get PDF Sigma?
PDF Sigma is available on Google Play for Android devices. Use the "Get it on Google Play" button on this page to open the listing.
Is PDF Sigma free? Does it have ads?
PDF Sigma can be installed from Google Play, and the app contains ads, as shown on its store listing.
Do I need an account or an internet connection?
No account is needed to use the app. Many PDF operations run directly on your device, so they do not depend on cloud processing.
Are my files uploaded to a server?
No. PDF Sigma processes your documents on your device, and your PDF files are not uploaded to a server for processing. See the Privacy Policy for full details.
What can PDF Sigma do?
Convert images to PDF, merge, split and reorder PDFs, export pages as JPG or PNG, make scanned documents searchable with OCR, protect PDFs with a password or remove one, and view your documents.
How does password protection work?
You can set a password on a PDF and choose an encryption level (AES-256 is recommended, AES-128 is also available). You can also set permission presets. To remove protection, enter the current password and save an unlocked copy. Your original file is not changed.
Can it read text from scanned documents?
Yes. The OCR tool creates a searchable PDF from an image or a scanned PDF, so you can find and select text in the result.
Is there a dark mode?
Yes. PDF Sigma includes both light and dark themes across the whole app.
Is there an iPhone version?
PDF Sigma is currently available for Android on Google Play.
I found a bug or have an idea. How do I reach you?
Email support.capricornlab@gmail.com or visit the Contact page. For bugs, include your device model, Android version and what you were doing.
We're here when
you need us.
Support email
support.capricornlab@gmail.comHelp with
- Using a tool or saving a file
- Bug reports and feedback
- Feature suggestions
More information
All your PDF tools,
in your pocket.
Install PDF Sigma from Google Play and get your documents sorted.
Get it on Google Play