Samsung phones run Android, which means they have the same PDF editing options as any other Android device — and a few Samsung-specific additions. Whether you're looking to annotate, fill in a form, sign, or make text edits, here's what works on a Samsung phone.
Using Samsung's Built-In PDF Viewer
Samsung phones come with a built-in PDF viewer that supports basic annotation — you can highlight text, add handwritten notes with the S Pen (on Galaxy S and Z Fold models), and view form fields. However, saving edits back to the PDF file varies by Samsung model and One UI version. On older devices, annotations may not save reliably to the file itself.
For straightforward reading and highlighting, the built-in viewer is fine. For anything more substantial — adding text, signing, restructuring pages — a dedicated tool gives more reliable results.
Editing PDFs on Samsung Using a Browser Tool
Open Samsung Internet or Chrome and go to WukongPDF. The PDF Editor tool works fully in the mobile browser — upload your PDF, add text boxes, annotations, or signatures, and download the edited file. This is the most accessible option since it requires no installation and works on any Samsung phone with internet access.
Samsung Internet supports file downloads to the device's internal storage, so the edited PDF saves directly to your Downloads folder where you can share it or open it in any viewer.
Editing PDFs With the S Pen on Samsung
Samsung Galaxy S Ultra and Z Fold models with S Pen support offer a genuinely useful PDF annotation experience. The S Pen's pressure sensitivity and fine tip make drawing signatures, circling content, and writing margin notes much more natural than using a finger. Apps like Samsung Notes and Adobe Acrobat are optimized for S Pen input on these devices.
In Adobe Acrobat for Android, the S Pen integrates with the drawing and signature tools so that stylus input is recognized as pen input rather than touch — giving you finer control and palm rejection while writing on the screen.
Best Apps for Editing PDFs on Samsung
Adobe Acrobat for Android is the most feature-complete option — it supports text editing, annotation, form filling, signing, and page management. The free version covers most common tasks; the paid subscription unlocks full text editing and OCR features.
Xodo PDF Reader & Editor is a strong free alternative with no subscription required. It handles annotation, form filling, and signing well, and has good S Pen support. For users who need to edit PDF content without a subscription, Xodo combined with WukongPDF's PDF Editor in the browser covers most tasks.
Filling PDF Forms on Samsung
Fillable PDF forms work well on Samsung phones. Adobe Acrobat and Xodo both detect form fields automatically and let you tap to type into them. After completing the form, save and share it directly from the app.
For forms that aren't interactive — where the fields are just visual boxes rather than actual PDF form fields — use a PDF Editor to place text boxes over the blank areas. This produces the same visual result as a filled form and can be saved and shared as a standard PDF.