Best PDF Editor Apps for Android Devices (2026 Guide)
On Android the thing that limits you is rarely the feature list. It is memory, the file picker, and finding the result afterwards. A phone will run out of room to hold a large scanned document long before any app runs out of buttons, so this page starts with the constraints and then covers which apps handle them best. One disclosure up front: we do not have an Android app. Our tool runs in the browser on Android, and that is a different proposition with its own limits.
In This Guide
What actually goes wrong on a phone
- Memory. A PDF has to be held in memory, and rendering pages for display multiplies that. Android is aggressive about reclaiming memory from backgrounded processes, so a large document in a browser tab is the most fragile arrangement possible: switch away to check a message and the tab may be discarded and reloaded, taking your unsaved work with it. A native app handles this better because it can save state. A 40 MB scan is where the difference starts to show on a mid-range phone.
- Getting the file in. Android hands files to apps through the system picker, which means your PDF may be in Downloads, in Drive, in an email attachment, or in a messaging app's own storage, and some of those are harder to reach than others. Saving the PDF to Files first, before opening any editor, avoids most of the frustration.
- Getting the file out. A browser download lands in Downloads with whatever name the tool chose, and then you have to find it to attach it to a reply. Native apps that offer a share sheet straight to the app you need are meaningfully faster for this.
- Precision. Placing a signature accurately on a signature line with a fingertip on a five-inch screen is genuinely difficult. Zoom in first, always. On a tablet with a stylus this stops being a problem entirely, which is the strongest argument for doing PDF work on a tablet rather than a phone.
The apps worth installing
Adobe Acrobat Reader
Free for viewing, annotation and basic form filling, and it is the reference implementation, so if a PDF renders oddly in something else, checking it here tells you whether the file or the other app is at fault. Its annotations are real PDF annotation objects, which means a colleague who opens your marked-up file sees your comments in a list and can reply to them. Conversion, character recognition and full editing sit behind a subscription; pricing changes, so check the store listing.
Xodo
Fast, and generous about what it includes without a subscription: annotation, signatures and form filling. It also writes real annotation objects. If you want one free app on an Android phone for reading and marking up documents, this is the usual answer and has been for years.
WPS Office
Worth it if you also need documents and spreadsheets on the phone, since the PDF tools come as part of a suite rather than as a separate install. The free tier carries advertising. Its main advantage over the dedicated PDF apps is conversion, because it already contains the document engines needed to do it.
A stylus-first app, if you are on a tablet
On a Galaxy Tab with an S Pen, or any Android tablet with a decent stylus, handwritten markup is a different activity from tapping at highlight tools, and an app that supports pressure sensitivity and palm rejection properly is worth seeking out. Check that whatever you choose exports handwriting into the PDF rather than keeping it in a proprietary note format, or the marks will not exist for anyone you send the file to.
The browser option, honestly described
RaptorPDF runs in Chrome on Android with no install. It is genuinely useful in two situations and mediocre in the rest.
Where it wins: on a managed or work device where you cannot install apps, and for a confidential document, because everything is processed in the page and nothing is uploaded. That second point is the whole argument for using it over a cloud tool on a phone.
Where it does not: it is a web page, so it has no share sheet integration, no access to your recent files, and no ability to survive the tab being reclaimed. Large documents are riskier here than anywhere else. Free covers three operations a day with files up to 50 MB, though on a phone you will hit a memory wall before you reach 50 MB on anything image-heavy. It also needs a connection to load the page once, after which it keeps working offline.
Two further things worth knowing on Android specifically. Chrome on Android has historically handed PDFs off to a separate viewer rather than rendering them inline, and its built-in PDF handling is considerably more limited than desktop Chrome's, so do not expect the desktop behaviour of filling in a form directly in the browser. And photos from a phone are often HEIC, which Chrome on Android cannot decode, so image-to-PDF may fail on camera files where it would work in Safari on an iPhone.
Steps, if you want it: open Chrome, go to raptorpdf.com, tap to add your PDF through the file picker, annotate or sign or assemble, then download. Zoom in before you place anything.
What Android already does for free
- Print to PDF. Android's print dialog includes a "Save as PDF" target. Anything printable, including a web page or an email, becomes a PDF locally with no app and no upload. This is also the simplest way to permanently flatten a filled-in form.
- Google Drive, if uploading is acceptable. Opening a scanned PDF with Google Docs runs character recognition and gives you editable text, at the cost of the layout and of the file having been uploaded. Fine for a lecture handout, not for a client document.
- The camera as a scanner. Drive and several system camera apps can capture a document to PDF with perspective correction, which is far better than photographing a page flat. The single biggest determinant of a usable scan is even lighting: no shadow across the page, no flash.
Comparison table
| Option | Install needed | Real PDF annotations | Files leave the device | Weak point |
|---|---|---|---|---|
| Adobe Acrobat Reader | Yes | Yes | Only if you use its cloud features | Conversion and editing behind a subscription |
| Xodo | Yes | Yes | Only with sync enabled | Limited conversion |
| WPS Office | Yes | Yes | Depends on the feature | Advertising on the free tier |
| Android print to PDF | No, built in | Not applicable | No | Creates PDFs, cannot edit them |
| RaptorPDF in Chrome | No | No, markup is flattened | No, nothing is uploaded | No share sheet, memory-limited, no Android app |
No install, nothing uploaded
Runs in Chrome on Android. Best for a confidential document on a device where you cannot install apps.
Open in ChromeFrequently Asked Questions
What is the best free PDF editor app for Android?
Xodo for most people: annotation, signatures and form filling without a subscription, and it writes real PDF annotation objects so a recipient can see and reply to your comments. Adobe Acrobat Reader is the other strong free option and is the reference renderer, useful when a file behaves oddly elsewhere. If you cannot install anything, or the document is confidential, a browser tool that processes locally is the alternative.
Can I edit existing PDF text on Android?
Not really, and not for free. Changing text that is already in a PDF is difficult on any platform and no free Android app does it properly. What every option here can do is place new text on top of the page, which covers filling non-fillable forms and adding notes. If the page is a scan there is no text to edit at all until character recognition has been run over it.
Which Android PDF option works without an internet connection?
Installed apps such as Xodo and Adobe Acrobat Reader work offline for viewing and annotation. Android's print-to-PDF is entirely local. RaptorPDF needs a connection to load the page once and then keeps working offline, since all processing happens in the browser, but a reclaimed tab will need to reload and that needs the network.
Why does my phone struggle with large PDFs?
Because the document has to be held in memory and rendering pages multiplies that, and Android reclaims memory from backgrounded processes aggressively. A browser tab is the most fragile place to keep a large document: switching away to check a message can cause the tab to be discarded and reloaded. For anything large, use a native app, or do the job on a computer.
Can I sign a PDF on Android for free?
Yes. Xodo, Adobe Acrobat Reader and browser tools all let you draw or place a signature at no cost. Be clear about what that is: a picture of a signature on a page. Electronic signatures are generally enforceable under laws such as the US ESIGN Act where the parties intended to sign, but a drawn image carries no audit trail and no certificate, so it is weak evidence if anyone disputes it. For contested or high-value documents, use a dedicated e-signature service.
Does RaptorPDF have an Android app?
No. There is an iOS app, and on Android the tool runs in Chrome without an install. That suits a managed device or a confidential document, and it is worse than a native app at everything involving the share sheet, recent files and large documents.
Related Resources
- RaptorPDF Annotator — Works in Android Chrome
- Sign a PDF — Draw, type or upload a signature
- Edit PDFs on iPhone Without Watermarks
- Best PDF Tools for iPhone 2026