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Browse all pages and tools available on PDFCheck. Everything you need for PDF analysis and optimization.
PDF Tools
Free PDF analysis and optimization tools
PDF Metadata Checker
Check PDF metadata, creation dates, and author information
PDF Validator
Validate PDF structure and check for corruption
AI Content Detector
Detect AI-generated PDF signatures
AI PDF Chat
Chat with any PDF using source-backed AI answers and page citations
PDF Optimizer
Compress and optimize PDF file size
PDF Signature Checker
Verify digital signatures and certificates in PDFs
PDF Image Extractor
Extract all images from PDF documents
PDF Accessibility Checker
Check PDF accessibility compliance and tagged structure
Merge PDF
Combine multiple PDF files into a single document
Split PDF
Split a PDF into individual pages or custom page ranges
PDF to Image
Convert PDF pages to high-quality PNG or JPEG images
PDF Password
Add or remove password protection from PDF files
PDF Metadata Editor
Edit PDF title, author, subject, keywords, and creator fields
PDF Metadata Remover
Remove hidden PDF metadata for privacy before sharing documents
PDF Form Filler
Fill in interactive PDF form fields online
PDF Form Builder
Add fillable form fields to any PDF document
PDF Editor
Edit PDF text, images, and annotations online
PDF Highlighter
Highlight PDF text, add notes, and download annotated PDFs online
PDF Software Directory
Browse PDF software and creators detected by our tools
All PDF Tools
Complete archive of PDFCheck analysis, editing, conversion, and automation tools
How It Works
Learn about our PDF analysis methods
Developers
API documentation and developer resources
Blog
PDF tips, security guides, and best practices
All Articles
Browse all blog articles
Chat with Any PDF Online
Guide to AI PDF chat, citations, comments, OCR, and source-backed answers
Why PDF Metadata Matters
Complete guide to PDF metadata importance
How to Verify PDF Digital Signatures
Practical guide to signature verification
Detecting AI-Generated PDFs
Identifying AI-produced document signatures
PDF Security Best Practices
Essential security practices for business PDFs
Understanding PDF Standards
Guide to PDF/A, PDF/X, and digital signatures
How to Compare PDF Contract Versions Before Approval
Use a two-pass contract review to catch wording changes, missing pages, altered properties, and signature issues before you approve the final PDF.
How to Identify Fonts in a PDF Before Editing or Printing
Find the font names stored in a PDF, understand embedded and subset labels, and choose the right next step for editing, printing, or source-file repair.
How to Fix an “Invalid PDF” Error Before Upload
Diagnose why a portal rejects your PDF, choose the smallest safe fix, and validate the exact copy before you upload it again.
How to Create an Accessible PDF from Microsoft Word
Build accessibility into your Word document before export, preserve tags in the PDF, check the result, and know which issues still need manual review.
How to Search a Scanned PDF When Ctrl+F Doesn’t Work
Can’t search a scanned PDF? Learn how to diagnose a missing text layer, extract text with OCR, review recognition errors, and choose the right way to make the document searchable.
PDF to Markdown for AI Workflows: Extract Clean Content from Any PDF
Learn how PDF to Markdown conversion helps AI workflows, RAG systems, note-taking, and document review by turning ordinary, scanned, or hard-to-parse PDFs into clean reusable content.
Extract Images from a PDF Online: Clean Asset Workflow
Learn how to extract embedded images from a PDF, when to export full pages instead, and what to check before reusing pictures from reports, catalogs, forms, or scanned files.
Password Protect a PDF Online: Secure Sharing Checklist
Learn when to encrypt a PDF, how to choose a safer password, how to test the protected file, and what to check before sharing sensitive documents.
Batch PDF Verification: Bulk-Verify PDF Files Online
Learn how to verify many PDFs at once with a repeatable checklist for structure, metadata, signatures, AI signals, accessibility, and sharing risk.
Split and Merge PDF Pages Online: Safe Workflow
Learn how to split, extract, reorder, and merge PDF pages without losing signatures, forms, bookmarks, accessibility structure, or private metadata.
How to Compress a PDF Without Losing Quality
Learn how to reduce PDF file size without making text blurry, breaking forms, stripping accessibility tags, or damaging signatures.
PDF Accessibility Checker Online: WCAG and PDF/UA Basics
Learn how to check PDF accessibility online, what WCAG and PDF/UA mean for PDFs, and which issues affect screen readers, reading order, language, and tagged structure.
PDF Edit History Checker: How to Read Modification Clues
Learn how a PDF edit history checker works, which metadata fields reveal edits, and how to identify modified PDFs using timestamps, software trails, signatures, and file structure.
How to Compare Two PDF Documents: A Complete Guide
Learn how to compare PDF files to spot differences in text, formatting, and structure — why it matters for contracts, compliance, and version control.
How to Remove Metadata from a PDF Before Sharing It
Every PDF you send carries hidden data — author name, edit history, software version, and more. Learn how to use PDFCheck to inspect, remove, or edit PDF metadata before sharing.
How to Check If a PDF Has Been Edited or Modified
Learn how to check if a PDF has been edited, detect tampering, and verify document history — free online tools and forensic techniques explained.
How to Verify PDF Document Authenticity and Integrity
Learn how to verify PDF document authenticity, check file integrity, and validate structure — a complete guide to PDF verification with free online tools.
How to View PDF Metadata Online (Step-by-Step)
Learn how to view and read PDF metadata online for free — check creation dates, author info, software used, and hidden document properties instantly.
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