Merge all PDF files free online

PDF Merger

Merge PDF Files

Drag and drop PDF files here or
'; } catch (error) { alert('Error merging PDFs: ' + error.message); } finally { mergeBtn.disabled = false; mergeBtn.textContent = 'Merge PDFs'; } }); });

How to Merge PDF in one PDF – User Guide

Combine multiple PDFs into one document in seconds

How to Use

  1. Add PDF Files
    • Click “Upload PDFs” or drag & drop files
    • Supports: PDFs (max 100MB each)
    • See live preview of all uploaded pages
  2. Arrange Documents
    • Drag & drop files to reorder
    • Use ▲/▼ buttons to adjust position
    • Delete unwanted files with the ❌ icon
  3. Merge Options
    • Page Range: Merge all pages or select specific ones
    • Rotation: Fix upside-down pages
    • Compression: Reduce final file size (Low/Medium/High)
  4. Generate & Download
    • Click “Merge PDFs” (processes in 5-10 seconds)
    • Auto-downloads as: merged_[date].pdf
    • Optional: Email the merged PDF

Key Features

✔ Unlimited Merging: Combine 100+ PDFs at once
✔ Smart Sorting: Intuitive page management
✔ Quality Retention: No quality loss in standard mode
✔ Secure: Files never leave your browser

Technical Specs

  • Max Total Size: 500MB per session
  • Output Formats: PDF/A (archival quality available)
  • Page Limit: Up to 1,000 pages
  • Compatibility: Works on all modern browsers

Pro Tips

🔹 Need to merge scans? Enable “Auto-Rotate” for perfect alignment
🔹 Creating reports? Use “Add Separators” between documents
🔹 For legal docs: Select “PDF/A” for long-term preservation

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