Lightweight PDF Compressor 4 for Mac v4.8.1 Chinese Activation Download

Key Features:

– **Smart Targeted Compression Algorithm**: The software employs a multi-dimensional compression processing system to intelligently identify different content elements within PDF documents, such as text, images, vector graphics, and forms. It automatically matches the optimal compression strategy for each content type, without requiring manual tuning. This ensures maximum file size reduction while protecting core content from damage. The software fully supports PDF versions 1.0 to 1.7 and 2.0, ensuring that compressed files can be opened by all major PDF readers without compatibility risks.

– **Advanced Image Optimization Engine**: For the highest PDF volume content, the software offers professional-level optimization capabilities, supporting JPEG, JPEG 2000, and ZIP among other mainstream image compression formats. Users can set different compression levels for colored, grayscale, and black-and-white images. The software also supports custom image maximum resolution, color depth, and sampling rate. Users can choose between lossless and lossy compression modes to achieve precise balance between file size and visual quality, avoiding issues like blurring and distortion in compressed images.

– **Deep Document Structure Cleanup**: In addition to core content compression, the software cleans up redundant data within PDF documents, including annotations, forms, thumbnails, bookmarks, redundant metadata, and hidden layers. This further reduces unnecessary volume, resulting in an极致精简的文件, while preserving the core reading and usage functions of the document.

– **Core Content Lossless Protection**: The software optimizes text content and vector graphics to ensure that documents like contracts, resumes, proposals, and design drafts retain their clarity and sharp edges, meeting the requirements of formal business and legal scenarios.

– **Full-Scale Batch Compression Support**: The software supports batch compression of multiple PDF files, allowing users to import multiple PDF files at once and automatically process them in sequence. This feature is particularly useful for handling large volumes of documents, such as archiving documents or organizing receipts. The software also supports file-level recursive processing, enabling the automatic compression of all PDF files within a folder, including those in subfolders.

– **Rich Preset Compression Configuration Files**: The software includes multiple official preset compression configuration schemes, covering low, medium, and high compression levels, each tailored to different scenarios such as email transmission, web publishing, and document archiving. New users can quickly achieve compression without needing to understand professional parameters by selecting the appropriate preset.

Version 4.8.1 Update Highlights:

– **New Features**:
1. Introduced a multi-core image processing engine, significantly improving the compression speed of image-intensive PDF files. The higher the CPU core count, the higher the compression efficiency.
2. Optimized the comparison view mode: When zooming in on two documents (using two-finger pinch-to-zoom), the pages will maintain alignment.
3. Improved the lossless compression algorithm for single-color images and scanned pages, and added an option to prohibit downsampling, preserving higher original image clarity.

– **Bug Fixes**:
1. Fixed the issue where PDF page backgrounds were displayed as pure black after compression.
2. Fixed the problem where the configuration file name in the comparison selector could not be refreshed and displayed the new file size and compression ratio immediately after re-compression.
3. Fixed the readability issues with embedded text in scanned images.
4. Fixed the issue where automatic operations (Automator) could not restore default parameters correctly.

Software Screenshot: