Merge PDF
Join two or more PDF files into one PDF, preserving the page order inside each source file.
Open Merge PDFStep-by-step instructions
- Choose at least two PDF files within the current file, size and combined-page limits.
- Check the selection order. The source files are appended in the order submitted by your browser.
- Run Merge PDF and save the merged PDF.
- 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.
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.
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.
Access and current limits
Check the tool page for current access, remaining usage and per-operation limits. File count, per-file size, total size and page limits can depend on your access and can change. Device and processor safety limits still apply when usage is unlimited. A paid pass does not necessarily increase every processing limit.
One successful export counts as one operation, including its multiple files or pages. Changing options and local previews do not use an operation. Current access checks must complete before the tool can release the result.
Check the current limits
Allowances and per-operation limits can change. The Merge PDF page shows the policy that applies to you. Per-operation safety limits still apply when usage is unlimited. See access passes if a tool or extra usage requires paid access.
For site-wide information, read the privacy policy and security details.