Split PDF
Free online PDF splitter supporting four modes: free page pick, split by page range, split into one PDF per page, or split into N equal parts. Multiple results are auto-packed into a ZIP for one-click download. No watermark. Powered by pdf-lib entirely in your browser for stronger privacy.
Related
What is PDF splitting?
PDF splitting is the operation of cutting one PDF file into multiple files by a defined rule. The biggest difference from "extract pages" is the result count: split usually yields multiple files (e.g. one PDF per page, zipped), while extract merges selected pages into a single new PDF.
**Typical scenarios:** archive every page of a 100-page scan separately, break a long report into chapter-level files for distribution, send different contract attachments to different departments, submit a registration packet as cover / form / attachment in three files. One-click split saves you from the chore of saving each page manually in a PDF reader.
**Difference from removing pages:** remove is "negative exclusion" and still produces a single file; split is "full division" and produces multiple files. As a mental model, "split by range" is closer to "save N copies of segments".
**Why lossless split matters:** powered by open-source libraries such as pdf-lib, we operate directly on PDF page objects, so text, fonts, vector graphics, forms and hyperlinks are preserved exactly. OCR text is kept, signatures are not broken, and file hashes match the source page hashes.
Use Cases
- When you only need to submit a few pages like an ID, signature page, or cover, use free page pick
- When a long technical document has to be split by chapter and sent to different teammates or clients, use split by range
- When a scanned whole-document PDF must be exported page by page or broken into smaller files, use the per-page mode
- When a document needs to be evenly split into N parts, specify the count and download the ZIP
- Split registration packets by cover / application form / attachment when submitting
- Split a textbook by lesson and distribute the lesson PDFs to different student groups or colleagues
How to Use
- Click the upload area or drag the PDF you want to split onto the page
- Pick a split mode: free pick, by range, per page, or equal parts
- Set the page range or part count and start processing
- Download the result: a single file downloads directly, multiple files are auto-zipped
Features
- Four split modes: free page pick, page range, per-page, and equal-parts
- Auto ZIP download: when split produces multiple files, they are bundled into a ZIP for one-click download
- Lossless page extraction: powered by pdf-lib operating directly on the PDF internals, preserving layout, fonts, vector graphics, hyperlinks and forms
- Fully client-side: every operation runs in your browser, files are never uploaded to a server
- No size limits: no file size or page count cap, handles anywhere from dozens to thousands of pages
- Auto dedupe, order preserved: duplicate page numbers are deduplicated automatically and exports follow your input order
Best Practices
Merge scans before splitting registration packets by category
When you need to submit scans split into cover / form / attachment, merge all scanned pages into one PDF first, then use "split by range" to slice by category page numbers. This is 5-10x more efficient than uploading each page separately.
Decide whether to keep the digital signature before splitting
PDF digital signatures depend on the whole-document hash, so splitting changes the content and breaks the signature. If the original is signed and downstream needs verification, use the PDF extract-pages tool (/pdf/extract-pages/) to keep the original intact and only split an internal copy.
Prefer "by range" over "per page" for large files
On PDFs with hundreds of pages, "per-page split" generates a flood of single-page files, slowing down download, unzip and any follow-up work. Splitting by chapter with "by range" produces N meaningful files at once and is much faster to download and unzip.
Compress the original PDF before splitting
If the source PDF is mostly large images or scans, run it through /pdf/compress/ first to shrink it to about 30% of the original size. Splitting speed can be 3-5x faster, browser memory peaks drop sharply, and low-end devices are less likely to crash.
Check part sizes in equal-split mode
"Equal split" divides the total page count evenly: 30 pages into 4 parts gives 8+8+7+7, with remainders distributed forward. If uneven distribution is unacceptable, switch to "by range" and specify segments manually.
Re-merge after split with the PDF merge tool
Splitting is often followed by merging. For example, split each chapter, keep only the chapters you need, and recombine them with /pdf/merge/. Combined with the four split modes, this gives you a full workflow: split, pick, merge.
Decrypt encrypted PDFs before splitting
Pure client-side processing built on pdf-lib cannot bypass PDF encryption. For encrypted PDFs, unlock them first with /pdf/decrypt/ (runs entirely in your browser, password is never uploaded) and then upload to this tool for splitting.
Password-protect sensitive files right after splitting
After splitting sensitive PDFs such as contracts, financial reports or case files, the individual files can be forwarded independently via email, cloud drive or chat. Lock each child file with /pdf/encrypt/ right after splitting to prevent single-point leaks.
FAQ
How do I split one PDF into multiple files?
This tool offers four split modes: split by page range, extract specific pages, split into one file per page, or split into N equal parts. Per-page split is great for scan archiving; split by range is great for chapter distribution; equal-split mode is great for breaking a large document into N pieces.
Can I extract just a few pages of a PDF into a new file?
Yes. Use the "free page pick" or "split by range" mode and enter the page numbers you need (e.g. 1,3,5-8). The tool will extract the specified pages and save them as a new PDF. If you want multiple separate files, choose "per-page split" or "split by range" directly.
Is the per-page split result easy to download in bulk?
Yes. The per-page split output is automatically packaged into a ZIP file, so you download every page in one click, far more efficient than repeating the work manually. The ZIP filename includes the original PDF name plus a split-mode tag, which helps with archiving.
Will the resolution of the split PDF change?
No. The split operation only extracts and reuses the original pages, with no re-rendering or recompression, so the original content, layout, image resolution, vector graphics, hyperlinks and digital signatures are preserved perfectly.
What does split into N equal parts mean?
When you want a document divided evenly into a number of parts, just specify the count (e.g. 3). The tool distributes the total pages evenly, with each part holding a similar number of pages. The result downloads as a ZIP named part-1.pdf, part-2.pdf, part-3.pdf and so on.
Which PDF versions are supported? Can encrypted PDFs be processed?
All versions from PDF 1.4 through PDF 2.0 are supported. Encrypted PDFs must be unlocked with our PDF decrypt tool (/pdf/decrypt/) first, or the tool will refuse to process them to protect your data.
Does splitting change the PDF's signature or forms?
Lossless split powered by pdf-lib does not modify the original page objects, so signatures are kept. However, if a signature uses a whole-document digest, the signature on the split file may become invalid (because the overall content has changed). Form fields are fully preserved.
Is the uploaded PDF sent to a server?
No. All PDFs are processed in your browser by pdf-lib. Files never leave your device, and a refresh or page close wipes them. This is ideal for sensitive documents such as contracts, financial reports and case files.
Troubleshooting
Page keeps spinning after upload
Please check: 1) the file is a complete PDF, try opening it in a PDF reader to verify; 2) the file is encrypted, decrypt it first with /pdf/decrypt/; 3) the file is very large (> 500 MB), which takes longer in the browser; 4) close other tabs to free memory; 5) try Chrome or Edge.
Downloaded ZIP fails to unzip
Possible causes: 1) the download was interrupted, retry; 2) the file name is too long, rename it to something short and try again; 3) Windows' built-in unzip tool sometimes fails, install 7-Zip or WinRAR instead; 4) if the file is clearly 0 KB, re-upload.
Page order of the split result does not match the source
This tool splits in input order and does not auto-reorder. To adjust the order, use our PDF reorder-pages tool (/pdf/reorder-pages/).
Split PDF shows a signature error when opened
Digital signatures depend on the whole-document hash. Once the document is split, its content has changed, so the signature becomes invalid (this is by design in PDF signature mechanics). You can re-sign the file or export a version without the signature.
Splitting takes too long
All processing runs in the browser, so speed depends on the device CPU and PDF size. Tips: 1) compress very large files with /pdf/compress/ first; 2) close other CPU-hungry tabs; 3) split only the pages you need rather than the whole document.
Glossary
- pdf-lib
- An open-source JavaScript PDF processing library that operates directly on PDF page objects, enabling lossless split / merge / edit. This tool is built on top of it.
- per-page split
- Save every page of a PDF as an independent single-page PDF. Great for scan archiving, per-lesson distribution, or duplex print prep.
- split by range
- Split by user-entered page intervals (e.g. 1-5,8,12-15) into multiple files, each holding a continuous segment. Ideal for chapter-based distribution.
- equal-split mode
- Specify how many parts you want (e.g. 3), and the tool divides the total pages evenly, packaging the results as a ZIP. Useful to lower the cognitive load before sending a large file.
- ZIP packaging
- Compress multiple PDF outputs into a single .zip for one-click download. Built with the JSZip library, generated entirely in-browser with no server.
- PDF page object
- Each page inside a PDF is an independent data object that holds references to all of that page's content. Lossless split simply copies these objects into new files.
- File SHA-256
- A hash algorithm. The SHA-256 of a page stays identical after a lossless split, which can serve as evidence of "no tampering".
Four PDF split modes compared
Pick the split mode that best matches your page distribution, file count and use case.
| Split mode | Split rule | Result files | Typical scenario |
|---|---|---|---|
| Free page pick | 1,3,5-8,12 | 1 PDF (merged) | Extract and merge specific pages into a new file |
| By page range | 1-3 / 4-6 / 7-10 | N PDFs (ZIP) | Output chapters or attachments separately |
| Per-page split | One file per page | Total page count PDFs (ZIP) | Distribute scans or textbooks page by page, or prep duplex print |
| Equal split | Auto-equal split into N parts | N PDFs (ZIP) | Share a large file evenly across multiple people |
Page range input format cheat sheet
Several page input formats are supported. Use commas to separate sections and hyphens to indicate ranges.
| Format | Example | When to use |
|---|---|---|
| Single page | 5 | Extract just one specific page |
| Continuous range | 3-8 | Extract a full chapter |
| Discontinuous pages | 2,5,9 | Pick scattered key pages |
| Mixed format | 1-3,7,10-12 | Combine multiple segments |
| Reversed range | 8-3 | Reverse a section's page order |
Five common uses for PDF splitting
Covers core scenarios across office, teaching, business, legal and publishing.
| Role | Typical use case | Why split helps |
|---|---|---|
| HR / Admin | Split a 100-page employee handbook into onboarding / benefits / offboarding books | New hires take only what they need, no more flipping through the table of contents |
| Teacher | Split a full textbook into per-lesson single-page PDFs for student previews | Smaller files to send, study by lesson |
| Lawyer | Split a 500-page case file into evidence, contract, agreement and verdict | Easier cross-examination and archiving |
| Finance | Split a 1000-page annual report into 12 chapter files for departments | Clear ownership, efficient circulation |
| E-commerce ops | Split product catalogs by category into single-page PDFs for listing | Easier to submit per page on Amazon / eBay |