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PDF Merger - Merge PDF - Combine PDF - PDF Joiner - PDF Merge

Merge PDF pages intelligently based on keywords, regex patterns, or custom rules. Find matching pages across multiple PDFs and combine them into a single document instantly.

Smart Merge Content-Based Free & Secure

Key Features

Keyword-Based Merging

Add multiple keywords like "Invoice", "Receipt", or "Total" to find and combine pages containing specific terms. See which keywords matched on each page.

Regex Pattern Matching

Use powerful regular expressions for advanced pattern matching. Find pages with emails, phone numbers, invoice numbers, or any custom pattern with live preview.

Combine Matched Pages

Download all matched pages from multiple PDFs as a single merged document. Perfect for combining invoice pages, report sections, or related documents.

Pattern-Based Extraction

Define start/end patterns or start/middle/end patterns to find pages between specific text markers. Great for structured documents and forms.

Multi-File Search

Upload up to 5 PDFs and search across all documents simultaneously. Results show exactly which files and pages matched with keyword badges.

One-Click Download

Download all matched pages as a single merged PDF with one click. Smart naming includes total page count for easy organization.

How to Merge PDF Pages

1
Upload PDFs

Upload up to 5 PDF files by dragging & dropping or browsing. Each file can be up to 25MB with multi-page support.

2
Extract Text (OCR)

Click "Extract All" to run OCR on all pages. Text is extracted locally and cached for instant re-searching.

3
Define Rules

Choose Keywords, Regex, or Pattern mode. Add search terms and see the regex preview update live as you build your rules.

4
Merge & Download

Review results with keyword badges. Click "Download Merged PDF" to combine all matched pages into one document.

Why Choose Our PDF Merger?

  • No Registration Required - Start merging PDFs immediately
  • 3 Search Modes - Keywords, Regex, and Pattern-based matching
  • Live Regex Preview - See your search pattern build in real-time
  • Merge Across Files - Combine matched pages from multiple PDFs
  • Keyword Badges - See exactly which keywords matched each page
  • Offline Caching - Processed PDFs cached for instant re-searching
  • 100% Browser-Based - All processing happens locally, no uploads
  • Smart Naming - Merged PDF includes total page count in filename

Frequently Asked Questions

First, OCR extracts text from all PDF pages. Then you define rules using keywords, regex, or patterns. The tool searches all pages across all uploaded PDFs and shows which pages match. You can then download all matching pages combined into a single merged PDF document.

Yes! The "Download Merged PDF" button combines all matched pages from all PDFs into a single document. For example, if you search for "Invoice" across 3 PDFs, all invoice pages are merged into one combined PDF. This is perfect for consolidating related documents.

Yes! All processing happens locally in your browser using PDF.js, Tesseract.js, and pdf-lib. Your files are never uploaded to any server. OCR text is cached locally in IndexedDB for performance, and you can clear it anytime by starting a new session.

Keywords: Add multiple keywords and find pages containing any of them. Each matched keyword shows as a colored badge.

Regex: Use regular expressions for advanced patterns like invoice numbers, dates, or custom formats.

Pattern: Define start/end text markers to find pages between specific content boundaries.

Results show detailed information with colored badges for each matched keyword. You can see exactly which keywords triggered on which pages. Each page displays the specific keywords that were found, giving you complete transparency before merging.

You can upload up to 5 PDFs at once (up to 10 for registered users) and search all of them simultaneously. The merger combines all matched pages from all files into one document. There's no limit on the number of matched pages that can be merged.

The merged PDF is named using the format: onlineocr.io-mergedPdf-[page count]-pages.pdf. This makes it easy to identify how many pages were combined from all source documents.

Yes! Our PDF Merger is fully responsive and works on all devices - desktop, tablet, and mobile. The interface adapts to your screen size. OCR processing is CPU-intensive, so desktop is recommended for large files.

Ratings & Reviews

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