Compare PDF
Place two versions of a PDF side by side to spot the differences.
How to compare two versions of a PDF online
Upload both files
Drag the original PDF and the modified version into their respective slots, or click to select them from your computer.
Click Compare
The tool analyzes both documents page by page to detect differences between them.
Review the highlighted differences
You'll see both versions side by side, plus a third image with changes highlighted in red, so you can spot what's changed at a glance.
Why compare your PDFs on PDFDocks?
Comparing two versions of a contract, proposal, or report to spot what has changed usually requires uploading both documents—typically the most sensitive ones in the process—to an external server. On PDFDocks, the comparison is done with JavaScript, directly in your browser: neither of the two files leaves your device. The tool analyzes both versions page by page and generates a third image with changes highlighted in red, so you can spot at a glance what has been added, deleted, or modified, without any of the documents ever going through the internet.
How does comparison work?
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Yes. Neither of the two files is uploaded to a server: the comparison is performed directly in your browser with JavaScript.
How are the differences between the two PDFs displayed?
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You see both versions side by side, plus a third image with the changes highlighted in red so you can spot them at a glance.
Will differences be clearly marked?
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No. All analysis and comparison happen in your own browser, without either of the two files traveling over the internet.
Is my PDF data private?
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Yes, no installation needed. It works directly from your browser, without creating an account or downloading additional software.
Does it detect text changes and image changes too?
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Comparison is visual, page by page: it detects any difference in rendered content, whether text, images, or layout.
What happens if the two PDFs have different numbers of pages?
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Pages that exist in only one of the two files are displayed separately, clearly marked so you know which document they come from.
Tools
Merge PDF
Combine several PDFs into one file, in any order you like.
Split PDF
Extract specific pages or split your PDF into ranges.
Rotate PDF
Rotate the pages you need, one by one or all at once.
Compress PDF
Reduce the file size by re-optimizing its content.
PDF to images
Convert every page into a high-quality PNG image.
Images to PDF
Combine your photos or images into a single PDF document.
Watermark
Add overlay text to every page of your PDF.
Protect PDF
Add a password to restrict access to the file.
Unlock PDF
Remove the password from a PDF if you know it.
Remove pages
Delete the pages you don't need from your PDF document.
Extract pages
Select and save only the pages you need.
Reorder PDF
Freely reorganize, move or rearrange the pages in your document.
Crop PDF
Remove margins or adjust the visible area of the page.
Page numbers
Add page numbering with custom position, style and font.
Fill PDF forms
Detect fields and fill in existing PDF forms.
Sign PDF
Draw your signature and stamp it onto any page of the document.
Scan to PDF
Capture documents from your phone and send them straight into a PDF.
OCR PDF
Turn scanned PDFs into documents with selectable, searchable text.
PDF to Markdown
Extract your PDF's content into editable Markdown text.
Markdown to PDF
Convert a Markdown file (.md) into a PDF document with formatting already applied, without uploading anything to a server.
PDF to Text
Extract text from a PDF and download it as a .txt file, free and without uploading your document to any server.
Word to PDF
Convert Word (.docx) documents into PDF format.
PDF to Word
Extract text from your PDF into an editable Word document (.docx).
Excel to PDF
Turn Excel spreadsheets (.xlsx) into PDF documents.
PDF to Excel
Extract text and tables from your PDF into an Excel spreadsheet (.xlsx).
Redact PDF
Permanently cover up text or graphics containing sensitive information.
Repair PDF
Attempt to recover and fix damaged or corrupted PDF files.
JPG to PDF
Convert one or several JPG photos into a single PDF document.
PDF to JPG
Convert every page of your PDF into a JPG image.
PNG to PDF
Convert one or several PNG images into a single PDF document.
PDF to PNG
Convert every page of your PDF into a high-quality PNG image.
WEBP to PDF
Convert one or more WEBP images into a single PDF document.
PDF to WEBP
Convert each page of your PDF into a lightweight, high-quality WEBP image.
HEIC to PDF
Convert one or multiple HEIC photos (iPhone format) into a single PDF document.
HTML to PDF
Convert an HTML file into a PDF document, preserving layout and styles, without uploading anything to a server.
EML to PDF
Convert an email (.eml) into a PDF document, including sender, recipient, subject, and message body.
MHT/MHTML to PDF
Convert a web page saved in MHT or MHTML format into a PDF document.
