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Merge PDF

Combine multiple PDF files into one document. Free online PDF merger with drag-and-drop reordering.

Upload PDF Files

Drag and drop PDF files here, or click to browse. You can add multiple files.
Files: 100

Developer API

Available via API

Automate this PDF workflow with the PDF Tools API. Each successful request costs 1 Credit, and failed processing attempts are refunded automatically.

/api/external/pdf-tools/merge-pdf1 Credit per successful requestOutput: result.pdf
APIGet API Key
curl -X POST https://itextmaster.com/api/external/pdf-tools/merge-pdf \
  -H 'x-api-key: YOUR_API_KEY' \
  -F 'files=@a.pdf;type=application/pdf' \
  -F 'files=@b.pdf;type=application/pdf' \
  -F 'options={}' \
  --output result.pdf

About This Tool

Merge PDF allows you to combine multiple PDF documents into a single file quickly and easily. Whether you're consolidating reports, combining scanned documents, or assembling a presentation, this tool makes the process seamless.

Simply upload your files, arrange them in your desired order using drag-and-drop, and merge them into one cohesive document. The tool preserves the quality of your original files and can optionally maintain bookmarks from each source document.

All merging happens locally in your browser, ensuring complete privacy for your sensitive documents.

How to Use

  1. Upload PDF Files

    Drag and drop multiple PDF files into the upload area, or click to select files from your device.

  2. Arrange Order

    Drag and drop the file thumbnails to arrange them in your desired order.

  3. Merge and Download

    Click the Merge button to combine all files, then download your merged PDF.

Use Cases

Combine Reports

Merge monthly or quarterly reports into a single annual document for easier distribution and archiving.

Assemble Portfolios

Combine multiple project documents, certificates, or work samples into a professional portfolio.

Consolidate Invoices

Merge multiple invoices or receipts into one document for accounting and record-keeping purposes.

Practical guide

Why choose local processing?

  • PDF collections can contain contracts, invoices, identity details, or internal business information, so keeping processing in the browser reduces exposure.
  • The website tool is free to use with no usage limits and does not require sign-in.
  • Local processing also keeps iteration fast: adjust options, preview the result, and export a single ordered PDF without waiting for an upload queue.

Best files for this tool

  • Best for PDF files that open correctly in a modern browser and are not intentionally damaged or restricted.
  • Works well for everyday business, school, legal, finance, and personal documents where you need a single ordered PDF.
  • For very large files, close unused tabs and process one batch at a time so the browser has enough memory.

Common limitations

  • Encrypted or permission-restricted PDFs may need to be unlocked before processing.
  • Scanned pages, unusual fonts, complex layers, and damaged files can reduce accuracy or processing speed.
  • Browser memory and device performance matter more for local tools than for upload-based services.

Local processing vs upload-based tools

  • Local tools keep routine website processing on your device, while upload-based tools send files to a remote server.
  • Upload-based services can move heavy work off your computer, but they add transfer time and require trusting a server with your files.
  • Use the API when you intentionally need server-side automation; use the website when you want private manual processing.

What to do if processing fails

  • Try a smaller file, a shorter page range, or one file at a time if the browser runs out of memory.
  • If a PDF is encrypted, damaged, or restricted, unlock or repair it first and then retry the workflow.
  • If the output looks wrong, check whether the source file uses scans, complex transparency, form fields, or unsupported embedded objects.

API automation

Automate combine multiple documents with the PDF Tools API. Each successful request uses 1 Credit, and every signed-in user receives 100 free API Credits each month.

View API automation docsCreate API Key

Frequently Asked Questions

How many PDFs can I merge?

You can merge up to 100 PDF files at once, with a total combined size of up to 500MB.

Will the merged PDF maintain the original quality?

Yes, the merging process preserves the original quality of all documents without any compression or quality loss.

Can I merge password-protected PDFs?

Password-protected PDFs need to be decrypted first. Use our Decrypt PDF tool to remove the password before merging.

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