How to split a large PDF into smaller files for email or an upload limit

When a PDF is over an email or upload limit, split it into chunks with Split PDF and check the size listed beside each part before downloading. The tool cuts by pages, not by megabytes, so you adjust the cuts until every part fits.

Before splitting, it is worth one try with Compress PDF. A scanned or photo-heavy PDF often shrinks enough to send in one piece, which is easier for the person receiving it.

Steps

1. Note the limit you need to stay under, for example 10 MB per attachment or 2 MB per uploaded file.
2. Open Split PDF and drop in the large file.
3. Start with a preset. Two halves is a good first try for a file that is a little over the limit; for a file several times over, pick Every 2 pages and raise the number with the plus button.
4. Read the list under the grid. Each file shows its page range and its size, for example "Pages 1-12 · 8.4 MB".
5. If one part is still too big, click a page inside it to add another cut there. Pages are not the same weight: a page with a full-colour photo can be many times heavier than a page of text, so the parts rarely come out equal.
6. When every part is under the limit, press Download all for a zip, or download each part on its own if the form wants separate files.

Compress first or split first?

Compress PDF scales down large photos and packs the file's internal structure. It does not take a target size, and some files barely shrink, so look at the result it shows before deciding.

Why the sizes do not add up exactly

The parts together usually weigh a little more than the original. Each part is a complete PDF, and pages that share a font or an image each need their own copy of it. A document where every page uses the same embedded font can show this clearly. It is normal and does not mean anything was duplicated on the page.

Naming and sending the parts

Parts are named after the original with their page range, such as statement-pages-1-12.pdf and statement-pages-13-24.pdf. That makes the order obvious to whoever opens them. If you send them across several emails, say in the first one how many parts to expect.

If the receiver needs one file in the end, they can put the parts back together with Merge PDF.

Questions

Can the tool split a PDF into files of a set size, like 5 MB each?

No. It splits by pages. The size of each part is shown before you download, so you can move the cuts until each one fits.

Will splitting lower the quality?

No. Pages are copied without re-encoding. Only compression changes how photos are stored.

Does a very large PDF work in the browser?

There is no fixed size limit, because the file is not uploaded. It is held in your device's memory, so a very large file may be slow on an older phone. A computer handles big files more comfortably.

Is the PDF sent anywhere?

No. Splitting runs in your browser, and the file stays on your device.