Merge PDF

How it works

1. Drop your PDFs — add as many as you like, in any order.
2. Reorder — use ↑ ↓ to arrange files; the top file comes first.
3. Merge & download — one combined PDF, saved to your device.

Merging PDFs: When, Why, and How to Do It Right

Everyone merges PDFs. Few people do it well — the result is usually a 40 MB file named final_FINAL_v3.pdf that nobody can navigate. Here's how to produce merged PDFs that are actually usable.

1. When merging makes sense (and when it doesn't)

Merge when the documents form one logical package: a job application (cover letter + resume + certificates), an expense report (form + receipts), a contract with its appendices, or chapters of a report going to a client.

Don't merge when recipients need the pieces separately — e.g., don't merge your ID scan into a job application if HR's system expects separate uploads. When in doubt, ask the recipient what they prefer. A merged PDF sent into a system that wanted separate files creates more work than it saves.

2. Order is a user interface

Think of page order as the table of contents your reader never sees:

• Cover/summary first — the reader should know what they're looking at within 5 seconds
• Chronological or logical flow — for applications: cover letter → resume → certificates → references
• Receipts and evidence last — supporting material goes at the back, like appendices in a book

Use the ↑ ↓ buttons above to arrange files before merging — thirty seconds of ordering saves your reader real confusion.

3. Mixing scanned and digital pages

The classic merge: a digitally-created form plus phone scans of receipts. Two things to know: scanned pages are images, so they're dramatically larger per page than digital ones (see file size below), and they're not searchable unless OCR'd. If the merged PDF needs to be searchable, run OCR on the scans before merging — most phone scanner apps have it built in.

4. Watch the file size

Merged PDFs balloon fast, and many upload forms cap at 10–25 MB. The culprits, in order: phone scans at full resolution (a single receipt photo can be 5 MB), embedded images, and duplicated fonts. Practical fixes:

• Scan receipts at the scanner app's "document" setting, not full photo resolution
• If the merged file is still too big, merge first, then run it through a PDF compressor
• For email, stay under 10 MB — above that, use a file-sharing link instead

5. Page size mismatches (A4 + Letter)

Merging a European A4 document with a US Letter one is fine — PDF pages keep their individual sizes. The result just has mixed page dimensions, which looks slightly odd but prints correctly. If it bothers you, standardize the sources before merging rather than after.

6. Password-protected PDFs

Encrypted PDFs can't be merged without the password — that's by design. Unlock them in your PDF reader first (File → Print → Save as PDF usually strips the password if you have the right to open it), then merge. Never try to bypass a password on a document you don't have the right to modify.

7. Name the output like you'll search for it later

merged.pdf is a fine default, but future-you will thank present-you for 2026-10-tax-return-with-receipts.pdf. Date + description + "what's inside" is the formula. Your downloads folder is a database; name things like it.

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Quick answers

How do I merge multiple PDFs into one?

Drop your PDF files onto the merger, reorder them with the ↑ ↓ buttons, then click Merge & Download. The combined PDF saves to your device — no account, no upload.

Is my PDF uploaded to a server?

No. Merging happens entirely in your browser with JavaScript. Your documents never leave your device — safe for contracts, resumes, and confidential files.

Is there a file size or page limit?

No artificial limits. Very large PDFs (hundreds of MB) may be slow on low-memory devices since everything runs locally, but typical documents merge in seconds.

Frequently asked questions