Merging multiple JPG images into a single PDF e-book is a high-frequency need in workplace office, personal organization, and content creation, widely applicable to scenarios such as product manual compilation, personal photo portfolio creation, teaching material collection, ancient books digitization, and corporate brochure production. Core pain points focus on messy layout, easy order confusion, unclear pagination, and tedious batch processing—traditional manual layout tools (e.g., Word) require inserting images one by one, adjusting sizes, and setting margins, which is time-consuming and prone to issues such as image stretching, messed-up page numbers, and uneven spacing; ordinary conversion tools lack targeted layout optimization, resulting in PDFs with either excessive blank space that wastes pages or crowded images that affect readability. Especially for dozens or even hundreds of images, the workload of manual adjustment increases exponentially, making it difficult to adapt to efficient organization needs. The core user demands are simple operation, standardized layout, batch processing support, and preserved image quality to quickly generate shareable, archivable PDF e-books.
Without relying on professional layout software, PDF Spark can complete image-to-PDF merging in one stop with extremely simple operations and full-scenario adaptability, accessible even to non-professional users. Open the tool’s web version (for scenarios without installation permissions) or local client (more efficient for batch processing), select the Image to PDF dedicated function, which supports two upload methods: one-by-one drag-and-drop (suitable for organizing a small number of images) or batch folder import (suitable for collections of dozens of images or more). After upload, images are arranged in the default order, and users can freely adjust the order by dragging to precisely match the e-book’s chapter logic, image narrative sequence, or material classification needs—real-time adjustments are possible without re-uploading. Layout parameters support personalized settings to balance reading experience and scenario adaptation: the default paper size is the universal A4 specification, and custom sizes such as Letter (for European and American scenarios) and A5 (for portable reading) are also available; check Auto Pagination to ensure each image occupies a separate page and avoid overcrowding; enable the Add Page Numbers function to customize page number position (header/footer, left/right), font style and size, and support adding page number prefixes (e.g., "Page X of Y") to improve e-book standardization; margins can be set to default, narrow, or wide—narrow margins are suitable for full-screen image display, and wide margins for subsequent annotations and notes.
For complex scenarios such as multilingual e-books and professional manuals, the tool provides advanced optimization functions to further improve PDF quality and practicality. It supports adding custom covers—upload a designed cover image, set independent cover layout (not subject to inner page image size rules), and add text information such as book title, author, and publication date with customizable fonts and colors, adapting to the display needs of product manuals and formal portfolios; for e-books with clear chapters, a clickable table of contents can be generated by manually adding chapter titles and corresponding page numbers, allowing quick jumps to target pages with a single click to improve reading convenience—especially suitable for thick documents with more than 100 pages. Real-time full-content preview is supported after generation; if image order errors or poor layout are found, adjustments can be made directly by dragging in the preview interface without re-uploading files, drastically reducing modification costs. The merged PDF supports lossless compression to reduce file size while retaining high-definition image quality, adapting to email transmission, cloud storage, and online sharing scenarios to avoid sending failures or slow loading due to oversized files; it also supports adding watermarks (text/image) to prevent unauthorized tampering and theft of the e-book and protect copyright security.
For batch merging of multiple image groups, the tool’s batch processing function can greatly improve efficiency, adapting to the batch organization needs of multiple scenarios. It supports importing multiple folders at once, with each folder automatically generating an independent PDF e-book. The system names files by folder name by default, and custom naming rules (e.g., "Theme + Date", "Product Model + Manual Type") are also available to avoid file confusion. For example, for family photo organization, create folders such as "2026 Spring Festival - Family Gathering" and "2026 Summer Vacation - Travel Records"; batch import will automatically generate corresponding PDF photo albums without one-by-one processing. For corporate product manual production, store images by different product models for classification, and batch merge to quickly generate multiple product manuals with automatic archiving for subsequent distribution. In addition, the tool supports batch image quality optimization; check HD Sharpening when uploading images to automatically improve the clarity of blurry images and correct tilted frames, ensuring uniform image quality and a good reading experience for the merged PDF e-book. The operation has zero threshold, perfectly adapting to the diverse image merging needs of individuals and enterprises.