免费 PDF、图像和 Markdown 工具——无需安装软件，文件无水印，文件保留时间不超过 60 分钟。
ACE PDFMD 是一个基于网页的工具包，拥有 70 多种处理 PDF、图像和 Markdown 文件的工具——合并、拆分、压缩、转换、编辑、签名、OCR、编辑等。它旨在成为桌面软件或仅付费转换器的真正免费、快速且尊重隐私的替代品，适合美国、欧洲及世界各地的个人和企业。
是的。任何人都可以无需注册使用 ACE PDFMD——匿名访客每天可免费执行 10 次任务/下载。创建免费账户可获得无限次下载。两者均无需信用卡。付费 Pro 计划（$2.99/月或 $24.99/年）为需要更多使用的用户额外移除广告及每次请求的文件大小/数量限制。
不需要。每个工具都在您的网络浏览器中运行——Chrome、Firefox、Safari 或 Edge，无需下载或安装。
许多工具根本不上传您的文件——它们完全在您的浏览器中运行。需要服务器处理的工具通过 HTTPS 传输，在 60 分钟内自动删除。查看我们的隐私政策。
不使用任何第三方 AI 或云 API 处理您的文档。所有转换、OCR 和编辑都在我们自己服务器上的自托管开源软件（如 LibreOffice、Tesseract OCR 和 PyMuPDF）上运行——您的内容不会发送给 OpenAI、Google Gemini 或任何其他 AI 提供商。
请查看我们的完整价格页面，了解每日任务限制、文件大小限制和价格的并排比较。
大多数免费 PDF 网站要么设置非常严格的限制，要么将工具埋在付费墙后面，要么悄悄地将您的文档货币化。ACE PDFMD 保持其匿名和免费套餐对日常任务真正可用，透明地说明存储内容及时长，并收取该类别中最低的 Pro 价格之一——$2.99/月——没有隐藏费用。
ACE PDFMD 构建于多个开源项目之上，并对它们表示感谢: pikepdf (MPL-2.0), pdfplumber (MIT) 和 pypdfium2 (Apache-2.0) 用于读取、渲染和编辑 PDF, img2pdf (LGPL-3.0) 用于无损的图片转 PDF, 服务器端还使用 Tesseract OCR 和 LibreOffice . 在您的浏览器中， KaTeX (MIT), Turndown (MIT) 和 Mammoth.js (BSD-2-Clause) 负责渲染与转换. PyMuPDF (AGPL-3.0) 已不再用于本项目的任何部分. 感谢这些项目的作者和社区。
| 工具 | 功能说明 |
|---|---|
| PDF to Word | Convert PDF into an editable DOCX. |
| Merge PDF | Combine multiple PDFs into one document. |
| Split PDF | Extract page ranges or split into fixed-size chunks. |
| Compress PDF | Shrink file size by optimizing images. |
| JPG to PDF | Combine images into a single PDF. |
| PDF to JPG | Convert each page to an image. |
| Word to PDF | Convert DOCX documents to PDF. |
| Edit PDF Text | Edit the existing text directly inside the PDF, in place, with matching font/size/color. |
| Edit PDF | Add text, boxes, or images anywhere on the page. |
| Sign PDF | Draw a signature and place it on your document. |
| Organize PDF | Reorder or delete pages. |
| Rotate PDF | Rotate all or selected pages. |
| Extract Pages | Pull specific pages into a new PDF. |
| Protect PDF | Add a password to encrypt your PDF. |
| Unlock PDF | Remove password protection. |
| OCR PDF | Make scanned PDFs searchable by adding a text layer. |
| Compare PDF | Highlight text differences between two PDFs. |
| PDF Reader | Open and read a PDF page-by-page, right in the browser. |
| PDF Form Filler | Fill in a PDF's form fields and save or flatten the result. |
| Redact PDF | Permanently black out sensitive content. |
| Crop PDF | Trim margins from pages. |
| Watermark PDF | Stamp text over every page. |
| Add Page Numbers | Insert page numbers into your document. |
| Repair PDF | Fix corrupted or malformed PDF files. |
| Delete PDF Pages | Remove specific pages from a PDF. |
| Resize PDF | Rescale every page to a standard paper size. |
| Grayscale PDF | Convert every page of a PDF to black & white. |
| Flatten PDF | Bake form field values into the page and lock them. |
| Edit PDF Metadata | View and change a PDF's title, author, subject & keywords. |
| PDF to Markdown | Convert PDF content into clean Markdown (great for docs/LLMs). |
| PDF to Text | Extract plain, unformatted text from a PDF. |
| PDF to HTML | Convert a PDF into a simple standalone HTML page. |
| Extract Images | Pull every embedded image out of a PDF into a zip. |
| PDF to PowerPoint | Turn PDF pages into slides. |
| PowerPoint to PDF | Convert presentations to PDF. |
| PDF to Excel | Extract PDF text into spreadsheet rows. |
| Excel to PDF | Convert spreadsheets to PDF. |
| HTML to PDF | Paste HTML/markup and render it as a PDF. |
| PDF to PDF/A | Best-effort archival format conversion. |
| Scan to PDF | Turn photographed pages into a clean, professional scan -- deskew, shadow removal, color/grayscale/B&W, and auto page-order by filename. |
| Scan to Markdown | Turn photographed pages into clean, searchable Markdown text -- same deskew/shadow-removal cleanup as Scan to PDF, then OCR extracts the text into a .md file, page by page. |
| Markdown Editor | Open, write, and edit Markdown with a live rich preview (tables, images, task lists) -- export to .md, PDF, Word, or HTML. |
| Markdown Viewer | Upload a .md file and view it beautifully rendered -- tables, images, code blocks and all. |
| Markdown to PDF | Convert a .md file into a formatted PDF. |
| Markdown to Word | Convert a .md file into an editable DOCX. |
| Markdown to HTML | Convert a .md file into a standalone HTML page. |
| Word to Markdown | Convert a DOCX document into clean Markdown, tables included. |
| HTML to Markdown | Convert an HTML file into clean Markdown. |
| Markdown Table of Contents | Auto-generate and insert a linked Table of Contents from your headings. |
| Compare Markdown | Highlight line-by-line differences between two Markdown files. |
| Merge Markdown | Combine multiple .md files into one document, in order. |
| Split Markdown | Split a .md file into separate files at each heading. |
| Markdown to EPUB | Convert a .md file into an EPUB e-book. |
| ODT to PDF | Convert OpenDocument Text files to PDF. |
| ODS to PDF | Convert OpenDocument Spreadsheets to PDF. |
| ODP to PDF | Convert OpenDocument Presentations to PDF. |
| TXT to PDF | Convert a plain text file to PDF. |
| RTF to PDF | Convert Rich Text Format documents to PDF. |
| EPUB to PDF | Convert an EPUB e-book to PDF. |
| CSV to PDF | Render a CSV file as a formatted table PDF. |
| ZIP to PDF | Convert every supported file inside a .zip and merge them into one PDF. |
| Basic Image Editor | Crop, rotate, adjust brightness/contrast/saturation, and convert to grayscale — all in one interactive editor. |
| Compress Image | Reduce image file size while preserving quality. Target a quality level or an exact KB size. |
| Resize Image | Resize images by pixels, percentage, or target file size in KB. Batch resize multiple images at once. |
| Convert Image | Convert between JPG, PNG, WebP, BMP, GIF, TIFF and more. |
| Image to PDF | Combine multiple images into a single PDF file. |
| Image to Text (OCR) | Extract text from images using OCR. Supports 35+ languages. |
| Upscale Image | Increase image resolution using AI-style super-resolution (Lanczos interpolation). |
| Image Metadata | View and strip EXIF/metadata from images. Remove GPS, camera info, timestamps. |
| HTML to Image | Render an HTML file as a PNG screenshot. |
| PDF to Image (HQ) | Export PDF pages as high-resolution PNG or JPG images. |