验证签名
验证PDF文档中的数字签名。检查证书有效性、签名者信息和文档完整性。
上传已签名的 PDF
关于此工具
验证签名工具允许您验证PDF文档中的数字签名。检查签名是否有效，查看证书信息，并确认文档完整性。
上传已签名的PDF，查看所有签名、其有效性状态、签名者信息，以及文档在签名后是否被修改。
所有验证都在浏览器本地进行，您的文档永远不会上传到任何服务器。
Practical guidance before you use 验证签名
Best for real document workflows
Use 验证签名 when you need a quick browser-based result without creating an account or sending routine documents through an unnecessary upload workflow. 文档验证 is a common example: 验证签名文档是否真实且未被篡改。
Privacy and file handling
EasyPDFNex prioritizes local processing in your browser. That means supported PDF operations run on your device, not in a public cloud queue. For sensitive files, review the output before sharing it, close the browser tab after downloading, and avoid processing documents you are not authorized to edit.
Quality checks after processing
After you 导出报告, open the result and check page order, text readability, signatures, links, and form fields. If the source file is scanned, encrypted, very large, or damaged, try a related workflow such as digital sign pdf, view metadata, decrypt pdf before repeating the task.
Start with a clean source file whenever possible. For 验证签名, the first step is usually "上传已签名PDF": 上传包含数字签名的PDF文档。 This simple preparation step prevents most failed exports, missing pages, and formatting surprises.
Editorial review note
This guidance is maintained by the EasyPDFNex editorial team and reviewed for practical PDF workflow accuracy. Tool pages are written to explain when a feature is useful, what to check before download, and where browser-based processing has limits.
如何使用
上传已签名PDF
上传包含数字签名的PDF文档。
查看结果
查看文档中找到的所有签名及其有效性状态。
检查详情
查看证书信息、签名者详情和签名时间戳。
导出报告
可选下载验证结果的JSON报告。
使用场景
文档验证
验证签名文档是否真实且未被篡改。
合规审计
检查签名有效性以满足合规和审计要求。
证书审查
查看已签名文档的证书详情和到期日期。
常见问题
"有效"是什么意思？
有效签名意味着文档自签名以来未被修改，且证书链完整。
可以验证多个PDF吗？
是的，您可以上传多个PDF并批量验证所有签名。
为什么签名可能无效？
如果文档被修改、证书过期或证书不受信任，签名可能无效。