Who this helps
- People assembling several documents into one PDF
- People separating chapters or individual pages
Document Utility
PDF Merge / Split
Merge multiple PDF files into one document or split a single PDF by page or page range. Files can be processed in the browser, making it useful for organizing documents and managing submission-ready PDFs.
PDF Merge
Arrange multiple PDF files in the order you want and combine them into a single PDF document.
PDF Split
Split one PDF by individual pages or specified page ranges and save the results as a ZIP file.
Browser Processing
After selecting files, merge and split tasks can be handled directly in the browser.
Mode
Merge
Files
0 files
Pages
0 pages
Status
Ready
Select PDF Task
Choose PDF merge or split. File order matters for merging, and page range input matters for splitting.
PDF Merge
Upload multiple PDFs, reorder them by dragging, and save them as one file.
Drag & Drop or
Upload multiple PDF files / Drag to reorder / Merge into one PDF
Notice
Merging follows the current list order. Drag file cards or use the up/down buttons before running the merge.
This is the name of the merged PDF file. The .pdf extension is added automatically.
The attachment order affects the page order of the output PDF.
Before Merging
For submission documents, check whether the order is cover, main content, and attachments before merging.
PDFs with many files or many pages may take longer to process.
Files to Merge
0 files
Total Pages
0 pages
Current Status
Please add files
Merge List
No PDF files have been added yet.
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PDF Split
Split one PDF into individual pages or custom page ranges and save the result as a ZIP file.
Drag & Drop or
Upload 1 PDF to split / Analyze page count / Save as ZIP
Notice
For range splitting, enter values like 1-3, 4-6, 7 to create separate PDFs for each range.
Split by Page creates a separate PDF for every page. Split by Range creates files from specified ranges.
Used as the base name for split PDF files and the ZIP file.
Used only when Split by Range is selected. Separate multiple ranges with commas.
Before Splitting
Split by Page creates each page as an individual PDF.
Range split results are generated as multiple PDF files and bundled into a ZIP file.
No PDF has been uploaded yet.
Document Information
Upload a PDF and the page count and file information will appear here.
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Recommended Task Presets
Quickly apply common PDF merge/split task modes and input examples.
Task Status
Check the current task mode, file count, page count, and merge/split result.
Task Mode
Merge
Files
0 files
Pages
0 pages
PDF merge result will appear here.
PDF split result will appear here.
Merge PDFs in order or split page ranges
Combine files in the order shown, or split one document into separate PDFs inside a ZIP. The tool copies PDF pages in your browser, so review both the input order and the final page count.
When to use this tool
- Combine a cover, form and supporting files
- Save a chapter as a separate PDF
From input to a checked result
- 1
Choose Merge or Split and add your PDF files.
- 2
For merging, arrange files with drag-and-drop or the up and down buttons.
- 3
For splitting, choose every page or enter ranges such as 1-3,4-6,7.
- 4
Run the operation and download the PDF or ZIP, then check its contents.
Combine three documents
- Input
- 1-page cover + 4-page form + 6-page appendix
- Result
- 11-page merged PDF
Every page of each file is copied in the order of the list.
Split three sections
- Input
- 40-page PDF; 1-12,13-28,29-40
- Result
- 3 PDFs containing 12, 16 and 12 pages
Endpoints are included. Each comma-separated entry creates a separate file.
How it works
pdf-lib copies page objects into a new document. Split mode creates one PDF for every page or range and JSZip packages the results. Unlike the compressor, it does not first turn pages into images.
Limitations
- Document-level bookmarks, attachments, forms and signature validation may change.
- Overlapping ranges repeat a page in more than one output file.
- Encrypted, damaged or very large files may not be processed.
Your data
PDFs and output files stay in the current browser during processing. They are not uploaded to the win-j conversion server.
References
Related tools
- Compress PDF
Compare a smaller image-based sharing copy.
- PDF tables to Excel
Extract text tables from selected pages.
Frequently asked questions
Which order does merging use?
The file list from top to bottom, with each file's pages in their existing order.
What does 1-3,3-5 produce?
Two three-page PDFs; page 3 appears in both. Overlap is allowed.
Can I enter 1-3-5?
No. Use single page numbers or one start-end range per comma-separated entry. Empty entries and out-of-bounds pages are rejected.