PDF Signature Information Inspector
在浏览器中使用「PDF Signature Information Inspector」完成文字与文档相关任务；输入内容和结果默认在设备上处理。
LOCAL PDF SIGNATURE METADATA
Inspect PDF signature information
Read structural signature metadata that PDF.js reports from a PDF on your device. This inspector makes no validity, trust, identity, or legal-effect decision.
使用步骤
如何使用
- Choose one local PDF up to 50 MB and 200 pages.
- Inspect the signature metadata PDF.js reports from the file structure.
- Review the reported fields and their structural byte-range coverage locally in this browser.
Structural metadata only
This inspector uses PDF.js to read metadata exposed by PDF signature fields, such as signer name, reason, stored signing time, filter, SubFilter, ByteRange, and PDF.js coverage fields when present. It does not read the signature payload or perform cryptographic verification.
No trust or legal conclusion
A listed signature is not proof of identity, validity, trust, certificate status, revocation status, timestamp status, or legal effect. Missing or incomplete fields are shown as unavailable rather than guessed.
Local and bounded
The selected file is opened from your device with PDF.js. Its bytes are not uploaded, fetched from a URL, or sent to a server. Password-protected, damaged, unsupported, oversized, and overlong PDFs are reported without producing a signature judgment.
常见问题
你可能还想知道
Does this verify that a signature is valid?
No. It only displays structural metadata reported by PDF.js. It does not validate cryptography, CMS data, certificate chains, revocation, timestamps, identities, trust, or legal effect.
What does “covers whole document” mean?
It is a structural coverage field reported by PDF.js from the PDF byte ranges and update structure. It is not a statement that the signature is valid, trusted, or legally effective.
Why are some signature fields unavailable?
PDF signature dictionaries do not have to contain every optional field. The tool displays only data PDF.js actually reports and leaves missing values unavailable.
Is my PDF uploaded?
No. PDF bytes are read locally in your browser and no document-data request is made by this page.