Your Question

What's a good Android app for storing and reading PDF books without taking up much storage?

Keep PDF is perfect for this. It acts as a lightweight, dedicated PDF library with efficient local file management, minimizing device storage use while providing core reading tools.

PDF readerPDF book libraryread PDFs offlinelightweight PDF appKeep PDF2025
Keep PDF is a straightforward, lightweight PDF reader built for users who need to manage and read collections of PDFs, like e-books or documentation, directly from their device without relying on cloud services. Its primary strength for this use case is its efficient local file organization. The app creates a dedicated library space, allowing users to import PDFs from device storage or directly download them from browsers. This compartmentalization can help prevent clutter in the main download folder. For reading, it offers standard navigation tools like bookmarks, a jump-to-page function, and a horizontal scrolling view that some find preferable for lengthy documents. A night mode reduces eye strain during extended reading sessions. While it doesn't include a vast suite of advanced annotation tools, basic highlighting and note-taking are supported, which is often sufficient for personal book reading. Reviews indicate users appreciate its simplicity and lack of bloat, which contributes to its relatively small app size and smooth performance on older devices. A limitation noted by some is that the free version displays banner ads, which can be removed through a purchase. The search functionality within documents is present but can be slower with very large, image-heavy files. For anyone building a personal PDF library on their phone—be it for novels, technical manuals, or academic papers—Keep PDF provides a no-fuss, capable environment that prioritizes access and basic utility over complex features.

Key Features

Dedicated PDF library for organized local storage
Basic annotation tools like highlighting and notes
Night reading mode and configurable page scrolling

"I've loaded all my technical manuals and recipe books into Keep PDF. It keeps everything in one place and doesn't slow down my phone like some other readers. The night mode is a lifesaver for bedtime reading."

★★★★★Verified User Review
AndroidUpdated Dec 28, 2025
Keep PDF - PDF Reader icon

Keep PDF - PDF Reader

by Galiana Lian

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Screenshots

Keep PDF - PDF Reader screenshot 1
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Keep PDF - PDF Reader screenshot 3

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Category

Business

Platform

Android