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SlimFile.app

Merge PDFs

Combine multiple PDFs into one, in the order you choose. Up to 20 at a time, 25 MB each.

Choose your PDFs

up to 20 at a time.

PDFMax 25 MB each

How it works

  1. Step 1

    Add your PDFs

    Drop up to 20 PDFs onto the page, or browse for them. Each can be up to 25 MB.

  2. Step 2

    Put them in order

    Files merge in the order they appear in the list — use the up and down arrows on each row to reorder before merging.

  3. Step 3

    Download the result

    One combined PDF, with every page exactly as it came in. Run it through PDF Slim afterward if you also want it smaller.

Why use SlimFile.app for this

  • Nothing is re-encoded

    Every page keeps its original text, fonts and images — merging never lowers quality.

  • Put them in any order

    Reorder the files before merging, and locked PDFs can be opened with their password on the spot.

  • Free, no sign-up

    No account, no email address, no trial that runs out.

  • No watermark

    What you download is clean — nothing added to your file.

  • Deleted within an hour

    Uploads and results are removed automatically about an hour after processing. We never look inside them.

Questions

How do I combine several PDFs into one file?
Add up to 20 PDFs, arrange them in the order you want, and merge. You download one PDF with every page in that order.
Can I control the order of the pages?
Yes. Files merge in the order they appear in the list — use the up and down arrows on each row to reorder before merging.
Does merging change the pages themselves?
No. Each page is copied from its source file exactly as it is — same text, fonts, images and structure. Nothing is re-encoded or compressed. Run the result through PDF Slim afterward if you also want it smaller.
Can I merge password-protected PDFs?
Yes. If a file needs a password, its row shows a field for it — type the password and merge again. Passwords are used once to open each file and are never stored.
How many PDFs can I combine at once?
Up to 20 files per merge, each up to 25 MB.

Related tools

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Pull specific pages out of a PDF, or break it into several files.

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