About the PDF Integrity Check
Drop a PDF to confirm it opens correctly and to see what's inside without launching a viewer: page count, title, author, creating application, creation and modification dates, whether it contains form fields, and whether a digital signature is present. Useful before sending a document, when a file arrives by email, or when a PDF misbehaves in one app but not another. The file is parsed in your browser and never uploaded.
What the check reports
- Validity — the file is parsed with pdf-lib; if the structure is corrupt, truncated or not actually a PDF, you get an error instead of a report.
- Page count — a quick sanity check that a merge or split produced what you expected.
- Metadata — Title, Author, Creator (the app that made the content, e.g. Word), Producer (the library that wrote the PDF), and creation/modification dates.
- Form fields — whether the document contains interactive AcroForm fields.
- Digital signature — detection of signature dictionaries, indicating the PDF has been signed (validity of the signature itself must be checked in Adobe Reader or a signing service).
Why a PDF might be broken
- Incomplete download or upload — the file is truncated and the cross-reference table at the end is missing.
- Wrong extension — an image, Word file or HTML error page saved as .pdf.
- Damaged by an email gateway or text-mode FTP transfer that altered bytes.
- Generated by a buggy library — pages render in Chrome but fail in Acrobat, or vice versa.
- Encrypted with a password the viewer does not have.
Metadata and privacy
The Author and Creator fields often contain a person's name and the software they used, and the dates reveal when a document was really made. Before sharing a contract, résumé or report externally, check these fields here. If they need changing, most PDF editors and the Edit Bookmarks / Organize PDF tools on EverydayTab rewrite the file, and dedicated metadata editors can blank the fields entirely.
How to use the PDF Integrity Check
- 1Open the PDF. Drop the file onto the page or click to browse. It is read locally.
- 2Review the report. Validity, page count, metadata, form fields and signature presence are shown immediately.
- 3Act on it. Re-download a corrupt file, fix metadata, or proceed with confidence that the document is intact.
Frequently asked questions
- Does this verify that a digital signature is valid?
- It detects whether a signature is present. Validating the signature — checking the certificate chain and that the document is unchanged — requires a trusted viewer such as Adobe Acrobat Reader or the signing platform.
- Can it repair a damaged PDF?
- No. It reports whether the file parses. If it fails, try re-downloading the original; some corrupt files can be recovered with Ghostscript or qpdf on a desktop.
- Why does the title show as Untitled?
- The document has no Title metadata set. Many PDF generators leave it blank; it does not indicate a problem with the file.
- Is my PDF uploaded?
- No. Parsing happens in your browser; the document never leaves your device.