安全

PDF数字签名

PDF数字签名 - Digital signatures on PDFs provide legal validity and prove document authenticity without printing. Digital signatures eliminate the print-sign-scan workflow, saving time, paper, and ink. In many countries, electronic signatures are legally valid.

PdfMetric 24 Jul 2026

安全

文件哈希验证

文件哈希验证 - File hash verification ensures that a downloaded file hasn't been corrupted or tampered with. Performing hash checks on software downloads, firmware updates, and sensitive documents is critical for security.

PdfMetric 20 May 2026

安全

EXIF数据与隐私

EXIF数据与隐私 - Every photo taken with a smartphone or digital camera contains hidden EXIF metadata that may reveal your location. GPS coordinates, camera model, date/time, and sometimes even your name are included in this data. Removing this data before sharing photos online protects your privacy.

PdfMetric 25 Apr 2026

安全

保护PDF敏感数据

保护PDF敏感数据 - PDF documents may contain personal data, financial information, or trade secrets. Protecting this sensitive data before sharing is mandatory under GDPR, CCPA, and other data protection regulations. Redaction and masking tools permanently hide this data.

PdfMetric 09 Feb 2026

安全

PDF安全指南

加密、保护和安全共享PDF文档的综合指南。

PdfMetric 15 Dec 2025

安全

PDF编辑和隐私指南

PDF编辑和隐私指南 - PDF redaction is the most secure way to ensure document confidentiality by permanently removing sensitive information. Simply covering with a black box is not enough; the data must actually be deleted.

PdfMetric 03 Oct 2025

安全