Split PDF Files Online: A Step-by-Step Guide

Splitting a PDF file means dividing it into multiple smaller documents — extracting specific pages, separating every N pages, or splitting by custom page ranges. Whether you need to send only certain pages of a contract, extract a chapter from an ebook, or divide a scanned document into individual files, an online PDF splitter lets you do it instantly without installing software.

Why You Might Need to Split a PDF

• Extract a few pages from a large document to share via email
• Separate a multi-page contract into individual signature pages
• Divide a scanned book into chapters
• Split a portfolio into separate project files
• Extract an invoice from a monthly statement
• Remove unwanted pages before merging with another PDF

Splitting Methods

Method 1: Extract Specific Pages

Select the exact page numbers you want to extract as a new PDF file. Page ranges use the format 1-5, 8, 11-13.

Input:  100-page document
Extract: 1-5, 8, 11-13
Output: 8 pages (1,2,3,4,5,8,11,12,13) in a new PDF

Method 2: Split Every N Pages

Split a document into chunks of N pages each. This is useful for dividing a large PDF into smaller files of equal size.

Input:  50-page document
Split:  every 10 pages
Output: 5 files (pages 1-10, 11-20, 21-30, 31-40, 41-50)

Method 3: Split by Custom Page Ranges

Define each output file with its own page range. Each range becomes a separate PDF.

Input:         30-page document
Split ranges:  1-5, 6-15, 16-20, 21-30
Output:        4 files

How the PDF Splitter Tool Works

The PDF Splitter tool on Help2Code runs entirely in your browser using PDF.js. Your file never leaves your device — no upload to a server, no privacy concerns.

Step-by-Step Instructions

1. Open the PDF Splitter tool in your browser
2. Click the upload area or drag and drop a PDF file onto it
3. Select the split method: extract specific pages, split every N pages, or custom ranges
4. Configure the output: enter page numbers, interval, or ranges
5. Download the result: each split section is generated and downloaded automatically

Code Examples

JavaScript: Split PDF Using pdf-lib

const { PDFDocument } = require('pdf-lib');

async function splitPdf(sourceBytes, pageRanges) {
  const sourceDoc = await PDFDocument.load(sourceBytes);
  const outputDocs = [];

  for (const range of pageRanges) {
    const newDoc = await PDFDocument.create();
    const [start, end] = range;
    const copiedPages = await newDoc.copyPages(
      sourceDoc,
      Array.from({ length: end - start + 1 }, (_, i) => start + i)
    );
    copiedPages.forEach(page => newDoc.addPage(page));
    outputDocs.push({
      pages: `${start + 1}-${end + 1}`,
      bytes: await newDoc.save()
    });
  }

  return outputDocs;
}

// Usage: extract pages 1-3 and 5-7 (0-indexed)
const ranges = [[0, 2], [4, 6]];
splitPdf(pdfBuffer, ranges).then(console.log);

Python: Extract Pages with PyMuPDF

import fitz  # PyMuPDF

def extract_pages(input_pdf: str, output_pdf: str, page_numbers: list[int]):
    src = fitz.open(input_pdf)
    dst = fitz.open()

    for num in page_numbers:
        dst.insert_pdf(src, from_page=num, to_page=num)

    dst.save(output_pdf)
    dst.close()
    src.close()

extract_pages('input.pdf', 'output.pdf', [0, 1, 4, 5])
# Extracts pages 1, 2, 5, 6 (0-indexed)

PHP: Split PDF with FPDI

use setasign\Fpdi\Fpdi;

function splitPdf(string $inputFile, array $pageRanges): array {
    $outputFiles = [];
    $pdf = new Fpdi();
    $pageCount = $pdf->setSourceFile($inputFile);

    foreach ($pageRanges as $i => $range) {
        $output = new Fpdi();
        [$start, $end] = $range;

        for ($page = $start; $page <= $end; $page++) {
            $templateId = $output->importPage($page);
            $size = $output->getTemplateSize($templateId);
            $output->addPage($size['orientation'] === 'L' ? 'L' : 'P', [$size['width'], $size['height']]);
            $output->useTemplate($templateId);
        }

        $filename = tempnam(sys_get_temp_dir(), "split_$i") . '.pdf';
        $output->Output($filename, 'F');
        $outputFiles[] = $filename;
    }

    return $outputFiles;
}

$ranges = [[1, 3], [5, 7]]; // 1-indexed pages
splitPdf('input.pdf', $ranges);

Command Line: Using pdfseparate (Linux)

# Split every page into individual files
pdfseparate input.pdf output_%d.pdf

# Split into ranges using pdfjam
pdfjam input.pdf 1-5 --outfile part1.pdf
pdfjam input.pdf 6-10 --outfile part2.pdf

Comparing PDF Splitting Tools

Best Practices

• Check privacy policies — Use client-side tools for sensitive documents
• Verify page ranges — Double-check your page numbers before splitting
• Keep original backups — Never split the only copy of an important document
• Review output files — Open each split file to confirm it contains the expected pages
• Name files clearly — Use descriptive names like contract-signature-page.pdf instead of output1.pdf

Related Tools

After splitting, you might need to compress PDF files to reduce file size, remove pages from a document, or merge multiple PDFs back together. All these tools run in your browser with no upload required.

Conclusion

Splitting PDF files is a common document task that every professional encounters. Whether you need to extract specific pages, divide a document into equal parts, or create custom page ranges, an online PDF splitter makes the process instant and privacy-safe. Use the PDF Splitter tool for browser-based splitting, and explore the programmatic approaches above for automated document processing.