Onyx PDF: Edit, Scan & Sign

Spectra Apps

About this app

Stop handing over sensitive documents to apps that silently upload them to servers. Onyx PDF is built for absolute privacy — all processing happens completely offline on your device. A powerful all-in-one PDF reader, editor, scanner, and document toolkit with no ads and no watermarks.

▶ CORE FEATURES

Scan & Digitize
• Smart Scanner — Turn receipts, forms, and whiteboard notes into clean PDFs using your camera with automatic edge detection and smart cropping.
• OCR Text Extraction — Convert non-searchable scanned images and PDFs into selectable, copyable, searchable text with high accuracy.

Pro Editing Tools
• Merge & Split PDF — Combine multiple PDFs into one document, or break large PDFs into smaller sections by page ranges.
• Rearrange Pages — Drag and drop to reorder pages. No more rescanning just to fix page order.
• Compress PDF — Shrink heavy files without losing quality to bypass email attachment limits.

Sign & Secure
• E-Signatures — Draw and place your signature directly onto contracts. A dedicated landscape canvas makes signing feel natural and precise.
• Lock & Unlock PDF — Password-protect sensitive documents, or decrypt files when you have the right credentials.

Convert Anything
• DOC to PDF — Convert Word documents into universally shareable PDFs in one tap.
• Image to PDF — Turn photos and gallery images into clean PDF documents.
• PDF to Image — Export PDF pages as high-res JPG or PNG images.
• PDF to Long Image — Render an entire document as one continuous scrolling image.

The Ultimate Reader
• All Formats — Open PDFs, Word (DOC/DOCX), Excel (XLS/XLSX), PowerPoint (PPT/PPTX), RTF, CSV, TXT, HTML, XML, and JSON from one lightweight app.
• Smart Organization — Files auto-sorted by type. Use favorites for quick access and the recycle bin to restore deleted files.
• Direct Print — Send documents to Wi-Fi or cloud-connected printers via Android's built-in print framework.

▶ MODERN DESIGN
Built with Material 3 and Jetpack Compose. Dark mode, dynamic color themes, and multi-language support ensure the app adapts to you.

▶ WHO CAN USE ONYX PDF?

Students — Scan textbooks and lecture notes into searchable PDFs. Merge assignments. Compress projects for email. Extract text from book images for study notes.

Professionals — Sign contracts and NDAs on your phone. Lock confidential reports with passwords. Convert Word proposals to client-ready PDFs. Print on the go.

Small Business Owners — Scan receipts and invoices for a paperless archive. Merge monthly statements into annual records. Compress catalogs for email. Lock sensitive files before sharing.

Researchers — OCR scanned archives to make them searchable. Extract text from journal screenshots. Rearrange research papers without rescanning.

Teachers — Scan lesson plans and whiteboard notes into PDFs. Convert Word worksheets for distribution. Split curriculum documents into individual lesson files.

Freelancers — Sign client contracts digitally. Convert portfolios to compressed PDFs. Lock proposals with passwords. Scan sketches into digital references.

Everyday Users — Digitize IDs, insurance cards, and warranties. Convert family photos to shareable PDF albums. Compress files for online portals. Lock personal documents on your device.

▶ PRIVACY FIRST — NO CLOUD, NO UPLOADS
Your documents never leave your device. All PDF processing — merging, splitting, compressing, encrypting, decrypting, OCR, and conversion — happens 100% locally via Apache PDFBox. No internet required for any core tool. Your files are yours alone.

Download Onyx PDF and take full control of your documents — privately, powerfully, and completely free of ads and watermarks.