How to Split a Large PDF Into Smaller Files (Free)

A 300-page manual, a year of scanned statements, a combined report someone emailed you: a big PDF is slow to open, too large to attach, and too much to send when someone only needs one section. Here's how to split a large PDF into smaller files, three different ways, depending on what "smaller" needs to mean.

Way 1: Equal parts (every 10, 20 or 50 pages)

The fastest way to break up a long file when you just need manageable chunks:

1. Open Split PDF and add the file. The page count appears at the top.
2. Choose Split into parts of equal length.
3. Enter how many pages each part should have. For a 95-page file, 25 gives four files: 25, 25, 25 and 20 pages.
4. Click Split PDF. All the parts download together as one .zip.

The files are named in order with their page numbers, like report-part-1-pages-1-25.pdf and report-part-2-pages-26-50.pdf, so nobody has to guess which part is which.

Splitting doesn't change the pages; they're copied exactly. And everything runs in your browser, so the file isn't uploaded, which matters for large files in two ways: it's private, and you don't wait for a 200 MB upload.

Way 2: Just the pages someone needs

Often the real answer to "it's too big to send" is that the other person only needs part of it:

1. In Split PDF, choose Extract pages.
2. Type the pages you want, like 42-57 for one chapter.
3. Click Split PDF to download just those pages.

Need several sections in one file? Type them as a list, like 3-5, 40-44, and they come out together in that order. Want each section as its own file? Run it once per section.

Way 3: By chapter

For books, manuals and reports, chapters are the natural way to split. If the PDF has bookmarks, they tell you exactly where each chapter starts. See how to split a PDF by chapter.

Splitting to fit an email or upload limit

If the goal is to get each file under a size limit, like 25 MB for Gmail or 2 MB for a portal:

1. Work out how many pages fit. Divide the file size by the page count to get the average size per page. A 120 MB file with 300 pages is about 0.4 MB per page, so about 50 pages fit under 20 MB (keeping a safety margin).
2. Split into equal parts of that many pages (Way 1).
3. Check each part's size. Scanned pages vary in size, so one part can come out bigger than average. If a part is still over the limit, split that part again.

Compressing might make splitting unnecessary. If the PDF is large because it's made of scans or photos, Compress PDF can often shrink the whole file enough to send in one piece. Its Target size option compresses to the exact limit you give it. Try compressing first, and split only if the result is still too big or too blurry.

When you send a file in parts, label them clearly. Put "Part 1 of 4" in each email subject, or keep the numbered file names from the zip, so the recipient can put them back together.

Putting parts back together

If you receive a PDF in parts, Merge PDF joins them back into one file. Add the parts in order, check the list, and merge.

FAQ

How do I split a large PDF into multiple files? In Split PDF, choose Split into parts of equal length, enter the number of pages per part, and download all the parts in one .zip.

Is there a file size limit for splitting? No upload means no server limit. Very large files are limited only by your device's memory, so for very big files a computer works more smoothly than a phone.

Will splitting reduce the quality of my PDF? No. Pages are copied exactly as they are; nothing is compressed or re-rendered.

Can I split a PDF by file size instead of page count? Not directly. Work out the average size per page and split into parts of that many pages, as described above. Or compress the file first, which often removes the need to split.

Can I split a large PDF for free without uploading it? Yes. Split PDF is free, adds no watermark, and processes the file in your browser.