# Merge PDFs - Combine Files in Any Order, Free

Page: https://hirantha.me/tools/pdf-merge
Part of: Hirantha Sandaruwan Lakshan free tools (https://hirantha.me/tools)
Updated: 2026-07-31

Combine several PDFs into one, in the order you choose.

This is a free tool that runs in the browser: open the page to use it. File tools process files on the visitor's own device; files are never uploaded or stored. No account, sign-up, payment or watermark.

Combine several PDF files into one, in whatever order you choose, entirely in your browser. Nothing is uploaded - the merge happens locally and the combined file downloads directly.

Each PDF you add is parsed and validated individually before merging - checking the page count of every source file catches a damaged or unreadable PDF before it can silently merge in as zero pages, a real failure mode in more permissive PDF libraries.

Pages are copied at the object level rather than rendered and re-saved as images, so text stays selectable, links stay clickable, and quality doesn't degrade.

Drag to reorder the files before merging - the output follows the order shown on screen, top to bottom.

Q: Is there a limit on how many PDFs I can merge?
A: No fixed limit - it depends on your device's memory. Merging comfortably handles dozens of typical documents.

Q: Will the text still be selectable and searchable?
A: Yes, pages are combined at the PDF object level, not flattened into images, so text, links, and bookmarks behave exactly as they did in the source files.

Q: What if one of my PDFs is corrupted?
A: Each file is checked individually before merging. A damaged file is flagged with a clear error rather than being silently dropped or merged in as blank pages.

Q: Does merging remove password protection?
A: No - an encrypted PDF needs its password entered before it can be merged. A dedicated password removal tool is planned separately.

Q: Is my file uploaded anywhere during the merge?
A: No, the entire merge happens in your browser tab.

Q: Can I reorder files before merging?
A: Yes, drag the files into the order you want before starting the merge.

Q: Does merging affect file size?
A: The result is roughly the sum of the inputs. Shared resources like repeated fonts can be consolidated, so it's sometimes slightly smaller than the straight total.

Q: Can I merge PDFs with different page sizes?
A: Yes. Each page keeps its own dimensions, so a merged file can legitimately contain a mix of A4 and Letter pages.

Sources: Portable Document Format (PDF) (https://en.wikipedia.org/wiki/PDF); Web Workers API - MDN (https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API)

Related tools:

- [Organise a PDF](https://hirantha.me/tools/pdf-organise.md): Delete, reorder, and rotate pages in a PDF.
- [Split a PDF](https://hirantha.me/tools/pdf-split.md): Break one PDF into several, by page ranges or every N pages.
- [JPG to PDF converter](https://hirantha.me/tools/jpg-to-pdf.md): Combine one or more images into a single PDF.
- [Compress PDF](https://hirantha.me/tools/pdf-compress.md): Shrink a scanned or image-heavy PDF by re-encoding its photos.