Merge PDF

Merge PDF combines two or more PDF files into a single document in the order you provide. Students merge assignment chapters, accountants combine monthly invoices, and office workers join scanned forms — all without desktop software or cloud uploads.

The merger uses pdf-lib in your browser to copy pages from each source file into a new PDF. Original files are not modified; you download a fresh merged copy. Because processing is local, confidential contracts and HR documents stay on your machine.

Input: multiple standard PDF files (.pdf). All selected files must be readable and unencrypted. The tool accepts as many files as your browser memory allows — typically dozens of normal-sized documents.

Output: one PDF containing all pages from every input file, appended in upload order. Page size may vary between sections if source PDFs use different dimensions.

Step 1: Open Merge PDF and upload your files. Add them in the exact order you want pages to appear.

Step 2: Drag the ⠿ handle next to each file to reorder before converting.

Step 3: Click Convert and wait while pages are copied into the new document.

Step 4: Download the merged PDF and verify the first and last pages in a viewer.

Step 5: Keep backups of originals until you confirm the merge is correct.

Encrypted or password-protected PDFs must be unlocked before merging. If any input file is corrupted, the entire job may fail with an error.

Total input size above a few hundred megabytes can crash mobile browsers — merge in smaller batches on phones. Bookmarks, form fields, and metadata from sources are not always preserved. Mixed page orientations (portrait and landscape) are kept as-is, not normalized.

Monthly reporting: combine invoice PDFs into one attachment for accounting.

Job applications: merge cover letter, resume, and certificates.

Course packs: join lecture slide PDFs before sharing with students.

Document Converter never uploads your file for conversion. Processing uses JavaScript in your browser tab — the same security boundary as editing a document offline. Closing the tab clears the in-memory copy unless you saved the output.

We may load analytics or ads when you visit the site, but those requests do not include your document bytes. For HR records, medical forms, or unreleased designs, local conversion avoids the third-party upload step that cloud converters require.

Cloud tools like Smallpdf and iLovePDF receive your file via HTTP upload, process it on their servers, and return a download link. That model is convenient for public PDFs but adds privacy and compliance risk for sensitive content.

Document Converter runs pdf-lib, PDF.js, Mammoth, SheetJS, or Tesseract.js directly in your browser. Open DevTools → Network while converting: you should see no POST containing your file. You trade server-side CPU for device-side privacy — often the right choice for personal and workplace documents.