JPG 格式会模糊细小的文字，并在锐利的边缘处产生光晕。PNG 格式则会精确地还原 PDF 文件中每个像素的绘制效果——当质量比文件大小更重要时，PNG 是理想之选。
或者将图片拖放到这里。
支持JPG, JPEG, PNG, WEBP, SVG, GIF, HEIC, HEIF, BMP, TIFF, HDR, JP2, RAF, PSD, CR3, DNG, APNG, AVIF, AVI, ESP, EXR, J2C, J2K, JXL, PFM, PNM, PPM, PSB, SGI, MPEG, PDF
可拖放单页或多页 PDF 文件。支持文本格式和扫描版 PDF 文件。受密码保护的 PDF 文件需要先解密。
每页均通过 PDF.js 以您选择的 DPI（屏幕显示 150 DPI，打印 300 DPI）渲染。像素使用无损 DEFLATE 格式写入 PNG，文本周围不会出现压缩伪影。
单页文件可直接下载；多页文件则以压缩包形式提供，包含编号文件。文字清晰锐利，边缘干净利落，色彩准确无误。
PNG provides lossless compression with transparency support
Perfect for graphics, logos, and images requiring transparency
Deflate compression algorithm with alpha channel support
perfect for graphics with transparency with advanced PNG encoding
Perfect for graphics, logos, screenshots, web design
Handles Portable Document Format, multi-page, universal from PDF files
文字清晰，边缘干净利落，色彩精准。
Portable Document Format
Requires Ghostscript to read. By default, ImageMagick sets the page size to the MediaBox. Some PDF files, however, have a CropBox or TrimBox that is smaller than the MediaBox and may include white space, registration or cutting marks outside the CropBox or TrimBox. To force ImageMagick to use the CropBox or TrimBox rather than the MediaBox, use -define (e.g. -define pdf:use-cropbox=trueor -define pdf:use-trimbox=true). Use -density to improve the appearance of your PDF rendering (e.g. -density 300x300). Use -alpha remove to remove transparency. To specify direct conversion from Postscript to PDF, use -define delegate:bimodel=true. Use -define pdf:fit-page=true to scale to the page size. To immediately stop processing upon an error, set -define pdf:stop-on-error to true. To set the page direction preferences to right-to-left, try -define pdf:page-direction=right-to-left. Use -alpha remove to remove transparency. When writing to a PDF, thumbnails are included by default. To skip generating thumbnails, -define pdf:thumbnail=false. To enable interpolation when rendering, use -define pdf:interpolate=true.
Portable Network Graphics
Requires libpng-1.0.11 or later, libpng-1.2.5 or later recommended. The PNG specification does not support pixels-per-inch units, only pixels-per-centimeter. To avoid reading a particular associated image profile, use -define profile:skip=name (e.g. profile:skip=ICC).
分辨率、透明度、渲染保真度和实际应用。
