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Diff Checker PDF

Compare two PDFs without uploading them. This tool checks if files are identical (size + SHA-256), and can scan bytes to report the first difference with a compact hex preview. If you only have extracted text, switch to Text Diff for a readable line-by-line comparison.

Category: Text · URL: /tools/diff-checker-pdf.html

Note: Without a full PDF renderer, this tool compares files at the binary level (sizes, hashes, and optional byte scan). Visual layout differences require a dedicated PDF viewer; for content-only review, use Text Diff with extracted text.


  



          

          

            Privacy: runs locally in your browser. No uploads, no tracking scripts.
          

        

      


      
    


    

      
How to use

      
Pick the mode that matches what you have (files or text).
  1. PDF Files (binary): choose PDF A and PDF B, optionally set a scan limit, then click Compare PDFs.
  2. Review the report: sizes, SHA-256 hashes, and (if enabled) the first differing byte + hex preview.
  3. Text Diff: paste extracted text from each PDF, choose ignore options, then click Compare Text.
  4. Use Copy report to share results.

      

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        Secondary intents covered: Verify whether two PDFs are exactly identical, Detect if a PDF changed after export, compression, or signing, Compare PDFs quickly using hashes instead of visual review, Locate the first differing byte to confirm a true binary difference, Compare extracted PDF text to review content edits, Generate a short comparison report to share with teammates, Validate file integrity after transfer (email, download, USB), Spot changes caused by metadata or incremental saves
      

    


    

      
FAQ

    
Does this tool upload my PDFs?
No. The comparison runs locally in your browser and doesn’t send files to a server.
Can it show visual (page layout) differences between PDFs?
No. This version compares files at the binary level (size/hash/bytes). For visual comparison you need a PDF renderer-based tool.
Why do two PDFs with the same content show as different?
PDFs can differ due to metadata, object ordering, timestamps, incremental saves, or signatures even if they look identical.
What does “First differing byte” mean?
It’s the earliest byte offset where the two files don’t match. It’s useful to confirm a real binary change and where it begins.
Is SHA-256 the best way to check if two PDFs are identical?
Yes for exact-file equality: if both SHA-256 hashes match, the files are identical byte-for-byte.
Can I compare PDF text instead of files?
Yes. Use Text Diff and paste extracted text from each PDF to get a readable line-by-line change list.
What are the limits for large PDFs?
Very large files may be slower because hashing and scanning must process many bytes. If needed, set “Scan bytes” to 0 and rely on hashes.