Qubit PDF Editor

Qubit PDF Editor is a complete PDF editor, PDF reader and PDF converter that runs entirely on your phone. Open a PDF, edit the text on the page, sign it, fill its forms, annotate it, reorder its pages, read the words off a scan, compress it, convert it to Word or Excel, and send it on — a PDF editing app with nothing ever uploaded anywhere.

✏️ EDIT PDF TEXT

Edit PDF files in place: tap a line, type the replacement, done. Qubit rewrites the document's own content, so the new text is drawn in the document's own font, at its own position, over its own background — no white patch. Keep the page's own look, or set bold, italic, underline, alignment, font, size and colour. Find & replace changes every occurrence in the document in one step.

📊 EDIT TABLES AND PICTURES

Qubit finds the tables on a page and lets you edit them cell by cell. Move, resize, rotate, mirror, fade, crop, replace or remove the pictures already in a document — or add your own from the gallery.

📝 SIGN PDF AND FILL FORMS

Fill text fields, tick checkboxes and choose from dropdowns. Draw your signature with a finger and drag it into place — on a form, or on any page of a document that has no form at all. Flatten the form so nobody can change it afterwards.

🖍️ ANNOTATE PDF

Highlight text (snapped to the words), draw freehand as smoothly as on paper, add sticky notes you can open and read again, and place free text. Annotations are standard PDF objects that open in Acrobat, Chrome and everything else.

📄 MERGE PDF AND ORGANISE PAGES

Rotate, delete, duplicate, reorder by drag, extract pages into a new file, and merge another PDF in.

🔍 OCR — MAKE SCANNED PDFS SEARCHABLE

Recognise the text on a scanned page and Qubit writes it back as an invisible, searchable layer. Search, highlight and copy start working on the scan. The recognition model ships inside the app, so it works with no internet.

🔄 PDF CONVERTER — PDF TO WORD, EXCEL AND MORE

PDF to Word (DOCX), Excel (XLSX), CSV, plain text, HTML and images. Word, Excel, text and images to PDF. Nine conversions, all on the device.

📑 HEADERS, FOOTERS AND PAGE NUMBERS

Add a header or footer across every page — with page numbers, page count and today's date — on a range, on odd or even pages, skipping the title page. Qubit also finds the running header a document already has and can replace or remove it.

🗜️ COMPRESS PDF

Shrink a PDF at three quality levels and see how much was saved.

🔒 OFFLINE PDF EDITOR — NOTHING LEAVES YOUR PHONE

No account. No sign-in. No upload. No analytics. No crash reporting. No runtime permissions. Every feature that touches your document runs on the device, and your original file is never written to — edits are saved to a new file you choose.

💡 HOW IT WORKS

Installing Qubit costs nothing, and using it as a PDF reader — opening, reading, searching, saving and sharing a PDF — never will. Using a tool on a document costs 10 Edit Points, and that unlocks every tool for the whole document, however many changes you make. Earn points on the Earn tab by choosing to watch a short ad to the end — one ad, 10 points, in batches with a short wait between them. Ads only ever play when you tap to watch one. No subscription, no purchase.

ALSO IN THE BOX

• Save to My documents — Qubit's own folder on your phone, listed in the app with size, page count and date; your original file is never touched

• Opens PDFs from any file manager, email or chat app with "Open with" and Share

• Password-protected PDFs

• Recent documents, and recovery of the document you were editing if the app is interrupted

• Light and dark themes, wallpaper colours on Android 12+, fit-width and fit-page zoom

• Share the finished document to WhatsApp, Gmail, Drive, Telegram, print — anything on your phone

• A built-in Guide that explains every tool and every limitation

• Undo and redo for everything

Qubit PDF Editor is a PDF editor app for Android, made by QubitSofTech. Support: [email protected]