PDF Metadata Editor: View, Edit, and Strip PDF Properties (Free)

pdfinfo document.pdf

exiftool -PDF:all document.pdf

import { PDFDocument } from "pdf-lib";
 
async function editPdfMetadata(pdfBytes, metadata) {
  const pdf = await PDFDocument.load(pdfBytes);
 
  if (metadata.title     !== undefined) pdf.setTitle(metadata.title);
  if (metadata.author    !== undefined) pdf.setAuthor(metadata.author);
  if (metadata.subject   !== undefined) pdf.setSubject(metadata.subject);
  if (metadata.keywords  !== undefined) pdf.setKeywords(metadata.keywords);
  if (metadata.creator   !== undefined) pdf.setCreator(metadata.creator);
  if (metadata.producer  !== undefined) pdf.setProducer(metadata.producer);
  if (metadata.creationDate !== undefined) pdf.setCreationDate(metadata.creationDate);
  if (metadata.modificationDate !== undefined) pdf.setModificationDate(metadata.modificationDate);
 
  return pdf.save();
}
 
// Example usage
const newBytes = await editPdfMetadata(existingPdfBytes, {
  title: "2024 Annual Report",
  author: "Finance Department",
  subject: "Annual Financial Results",
  keywords: ["annual report", "finance", "2024"],
  creator: "ToolNest AI",
  modificationDate: new Date(),
});
 
// Read existing metadata
async function readPdfMetadata(pdfBytes) {
  const pdf = await PDFDocument.load(pdfBytes);
  return {
    title:    pdf.getTitle(),
    author:   pdf.getAuthor(),
    subject:  pdf.getSubject(),
    keywords: pdf.getKeywords(),
    creator:  pdf.getCreator(),
    producer: pdf.getProducer(),
    creationDate:     pdf.getCreationDate(),
    modificationDate: pdf.getModificationDate(),
  };
}

from pypdf import PdfReader, PdfWriter
from pypdf.generic import NameObject, create_string_object
from datetime import datetime
 
def read_metadata(pdf_path: str) -> dict:
    reader = PdfReader(pdf_path)
    meta = reader.metadata
    return {
        "title":    meta.get("/Title", ""),
        "author":   meta.get("/Author", ""),
        "subject":  meta.get("/Subject", ""),
        "keywords": meta.get("/Keywords", ""),
        "creator":  meta.get("/Creator", ""),
        "producer": meta.get("/Producer", ""),
        "creation_date": meta.get("/CreationDate", ""),
        "mod_date":      meta.get("/ModDate", ""),
    }
 
 
def edit_metadata(input_path: str, output_path: str, new_meta: dict):
    reader = PdfReader(input_path)
    writer = PdfWriter()
    writer.append(reader)
 
    # Format date as PDF date string: D:YYYYMMDDHHmmss+TZ
    def pdf_date(dt: datetime) -> str:
        return dt.strftime("D:%Y%m%d%H%M%S+00'00'")
 
    metadata_to_write = {}
    if "title"    in new_meta: metadata_to_write["/Title"]    = new_meta["title"]
    if "author"   in new_meta: metadata_to_write["/Author"]   = new_meta["author"]
    if "subject"  in new_meta: metadata_to_write["/Subject"]  = new_meta["subject"]
    if "keywords" in new_meta: metadata_to_write["/Keywords"] = new_meta["keywords"]
    if "creator"  in new_meta: metadata_to_write["/Creator"]  = new_meta["creator"]
 
    # Always update modification date
    metadata_to_write["/ModDate"] = pdf_date(datetime.utcnow())
 
    writer.add_metadata(metadata_to_write)
 
    with open(output_path, "wb") as f:
        writer.write(f)
 
    print(f"Metadata updated: {output_path}")
 
 
# Example
edit_metadata("report.pdf", "report-clean.pdf", {
    "title":   "2024 Annual Report",
    "author":  "Finance Department",
    "subject": "Annual Financial Results",
    "keywords": "annual report; finance; 2024",
})

# Read all PDF metadata
exiftool document.pdf
 
# Set title and author
exiftool -Title="2024 Annual Report" -Author="Finance Department" document.pdf
 
# Set multiple fields and update ModifyDate
exiftool \
  -Title="2024 Annual Report" \
  -Author="Finance Department" \
  -Subject="Annual Financial Results" \
  -Keywords="annual report; finance; 2024" \
  -ModifyDate="now" \
  document.pdf
 
# Strip ALL metadata (for privacy/anonymization)
exiftool -all= document.pdf
 
# Strip metadata and save to new file (keep original)
exiftool -all= -o document-clean.pdf document.pdf
 
# Copy metadata from one PDF to another
exiftool -tagsFromFile source.pdf -PDF:all target.pdf

exiftool -all= document.pdf -o document-anonymous.pdf

from pypdf import PdfReader, PdfWriter
 
def strip_metadata(input_path: str, output_path: str):
    reader = PdfReader(input_path)
    writer = PdfWriter()
    writer.append(reader)
    
    # Replace all metadata with empty values
    writer.add_metadata({
        "/Title": "",
        "/Author": "",
        "/Subject": "",
        "/Keywords": "",
        "/Creator": "",
        "/Producer": "",
    })
 
    with open(output_path, "wb") as f:
        writer.write(f)