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Merge PDF Files Online – Combine Multiple PDFs into One

Upload multiple PDFs, drag to reorder pages, and combine them into a single document. No watermarks, no email required - free and done in seconds.

Select PDF files to merge

Drag & drop multiple PDF files here

PDF files only · Up to 100 MB each

How it works

Merge PDF files in 3 simple steps

No software to install. Works on any device with a modern browser - desktop, tablet or mobile.

01

Upload your PDF files

Click "Select PDF files" or drag and drop your PDFs directly onto the page. Add as many files as you need - up to 20 PDFs per job.

02

Arrange the merge order

Hover over any file card and use the arrow buttons to reorder. The numbered badge on each card shows the final merge sequence.

03

Merge and download

Click "Merge PDFs" and your files are combined in seconds. Download the finished document instantly - no email required.

Why SupaPDF

Everything you need to merge PDFs

Trusted by developers and businesses worldwide to combine PDF documents reliably and at scale.

Fast processing

Our infrastructure processes PDF merge jobs in seconds, even for large multi-file batches.

Private & secure

All uploads use encrypted HTTPS. Your files are automatically deleted from our servers after processing.

No installation needed

SupaPDF runs entirely in your browser. Nothing to download or install - just open the page and merge.

Full developer API

Automate PDF merging in your own apps using our REST API. Supports webhooks, realtime status, and more.

Developer API

Merge PDFs programmatically

Use our REST API to merge PDFs inside your own application. Create a job, upload your files to the provided URLs, then poll for the result.

curl -X POST https://api.supapdf.com/v1/jobs \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "tag": "merge-pdf-job",
    "tasks": {
      "upload-1": {
        "operation": "import/upload"
      },
      "upload-2": {
        "operation": "import/upload"
      },
      "merge": {
        "operation": "merge_pdf",
        "input": ["upload-1", "upload-2"]
      },
      "export-result": {
        "operation": "export/url",
        "input": ["merge"]
      }
    }
  }'

After creating the job, PUT each file to its upload_url, then poll GET /v1/jobs/:id?include=tasks until status is "finished". The download link is in the export-result task.

FAQ

Frequently asked questions

Everything you need to know about merging PDF files with SupaPDF.

Ready to merge your PDFs?

Free to use · No account required · Instant download