Merge PDF Files
Combine multiple PDF files into one document. Free, no signup, runs in your browser — files never leave your device.
Drag & drop your files here, or click to browse
Add up to 20 files
Done!
DownloadHow to Merge PDF Files
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1
Upload your PDFs
Drag and drop multiple PDF files or click to browse. You can add up to 20 files.
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2
Arrange the order
Drag files to reorder them. The merged PDF will follow this sequence.
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3
Merge and download
Click "Merge PDFs" to combine your files. The merged PDF downloads automatically.
Frequently Asked Questions
Upload your PDF files to ChangeThisFile, arrange them in your preferred order, and click Merge. The entire process runs in your browser — your files never leave your device. No signup, no watermarks, completely free.
Yes. ChangeThisFile merges PDFs entirely in your browser using pdf-lib. Your files are never uploaded to any server. They stay on your device throughout the entire process.
You can merge up to 20 PDF files at once for free. Each file can be up to 25MB. Pro users can merge unlimited files up to 500MB each.
Yes. After uploading your PDFs, you can drag and drop them to change the order. The merged file will follow the sequence you set.
No. PDF merging combines the original pages without re-encoding. The output quality is identical to the input files.
Related Tools
Ready to merge pdf files?
Combine multiple PDF files into one document. Free, no signup, runs in your browser — files never leave your device.