Helphonic

Merge PDF

Combine multiple PDF files into one document in the order you select them.

2 free operation(s) per day

Temporary files are private and removed after your download response.

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Current limits

per operation

Files
5
Per file
5 MB
Total size
20 MB
Pages
150
Read the security details
Page and file limits

The page limit applies to the total number of pages across all chosen PDFs. File count, individual file size and combined size must also fit the current limits.

A merge is one successful export even though it contains several input files. A failed validation does not produce a usable download.
Limit comparison

How to increase limits

Compare the per-operation limits available after registration or with an active paid pass.

Free account

Registered user

10 free operation(s) per day

Files
5
Per file
5 MB
Total size
20 MB
Pages
150
Create a free account
All access passes

Unlimited operations during active validity, subject to abuse safeguards.

Files
5
Per file
5 MB
Total size
20 MB
Pages
150
View packages

Frequently asked questions

How many PDFs can I merge?

The default limit is five files and 150 combined pages. Administrators can change it.

Are encrypted PDFs supported?

No. Remove the password before uploading a PDF you are authorized to edit.

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How to use

Merge PDF

Join two or more PDF files into one PDF, preserving the page order inside each source file.

Step-by-step instructions

  1. Choose at least two PDF files within the current file, size and combined-page limits.
  2. Check the selection order. The source files are appended in the order submitted by your browser.
  3. Run Merge PDF and save the merged PDF.
  4. Open the result and check the page order, page sizes and any important content against the originals.
Supported files and result

This tool accepts PDFs and produces one PDF. Every page from the first submitted file is followed by every page from the next file. Imported pages keep their individual sizes and orientations.

Use Organize PDF if you need visible page thumbnails, deliberate reordering, rotation, removal or mixing individual pages from several sources.

Compatibility and troubleshooting

Keep the original PDF. Rebuilding pages does not preserve interactive forms, annotations, bookmarks, layers or digital signatures. Encrypted, damaged and some compressed PDF structures are unsupported. A PDF that opens in a viewer can still fail export. If necessary, create a standard, unlocked PDF copy in an application you trust and inspect that copy before using it here.

If one file prevents the merge, test a smaller selection to identify the source that needs repair or re-export. If you only need some pages, extract those pages first to reduce the merge size.

Processing and privacy

The selected files are uploaded to Helphonic for processing in private storage. No third-party file-processing service is used. Temporary source and output files are removed after the download response, and failed processing cleans up temporary files. Keep your originals and save the result to your device.

About this tool

Upload two to five PDFs. Helphonic imports their pages into one new PDF and deletes temporary private files after sending your result.

Read the full Merge PDF guide (opens in a new tab)