Split a PDF into 10 MB parts

Cut an oversized PDF into parts that each stay under a limit you set, such as the 10 MB an email server will accept.

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.pdf · up to 300 MB

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How to Split by size

1
Add your PDF
Drop the file in or pick it from your device. Nothing is sent anywhere, so even a heavy scan is ready in a moment.
2
Set the maximum size per part
Type a number in megabytes or kilobytes, or take a ready limit such as 10 MB for email. Strict mode keeps every part under the number.
3
Download the ZIP with all parts
Press the button and save the archive. Inside are the parts in reading order, numbered so they stay easy to sort.

Ten megabytes per part, whole pages only

The page opens with 10 in “Maximum size per part”, MB under “Unit” and “Never go over the limit” switched on. Press “Update result” and pages go into each part in reading order until the next page would push it past 10 MB, so every part ends on a whole page. A megabyte here is 1,048,576 bytes, so a part may weigh up to 10,485,760 bytes; if a portal counts 10 MB as ten million bytes, type 9.5. Turned off, “Never go over the limit” lets a part reach 11 MB.

Part names and what a scan turns into

Each part keeps your file's name plus a number: scan.pdf becomes scan-part-1.pdf, scan-part-2.pdf and so on, listed with their real sizes under “Parts (sizes from the finished files)”. The numbers are not zero-padded, so a list sorted by name may put part-10 right after part-1; attach the parts by number. In our check on October 20, 2026, a 60-page scan of 46 MB came out as five parts: four of 9.5 to 9.6 MB and a last one of 5.9 MB, all in one ZIP within about two seconds. A PDF already under 10 MB comes back whole, with a note that no cutting was needed.

When one page alone is over 10 MB

Pages are never split, so a page heavier than 10 MB on its own goes out alone with -oversize in its name: scan-part-3-oversize.pdf. With “Never go over the limit” on, it is the only part that can exceed 10 MB, so check the list for that word before sending. Save that part with its own button and shrink it in Compress PDF with a target size; the other parts can go as they are.

Splitting on a phone and sending the parts

The split runs in the phone's browser, so the PDF is not uploaded. For mail or a portal that wants PDFs rather than an archive, open “Download one by one” instead of “Download all (ZIP)”: on an iPhone each part opens the Share sheet, where Mail or Save to Files takes it, and Android saves each part to Downloads. A mail limit covers the whole message, so send one part per email: two 10 MB parts make a 20 MB message. If the phone runs out of memory, close other tabs and try again.

Where your file is processed

Splitting happens inside your browser tab, on your own processor. The PDF is never uploaded, never queued on a server, and the finished parts are packed into the archive on your own machine before the download starts. There is no account, no email step and no log of what you split. Close the tab and every copy is cleared from memory with it.

Frequently asked questions

Why do the parts have uneven page counts?

Because pages weigh different amounts. Text pages are tiny, scans and photographs are heavy, and shared fonts count once. Each part is filled until the next page would break your size limit, so page counts follow bytes, not a fixed number.

What happens if one page is heavier than the limit?

That page is written out as its own part and marked with an oversize suffix in its file name. Nothing can make a single page smaller without recompressing it, so compress that page to a target size in Compress PDF first if the limit is hard.

How is this different from compressing a PDF?

Compression shrinks one file by re-encoding images and fonts, which costs quality. Splitting keeps every page as it is and spreads the pages across several files. Use compression when you need one file, splitting when several are fine.

Can I put the parts back together?

Yes. The parts keep the original page order and are numbered in sequence, so merging them in that order rebuilds the document page for page. Nothing is re-encoded on the way out, so the merged file matches the original content.

Is the size limit respected exactly?

In strict mode yes: every part is saved and measured, and a part is closed before it can pass your number. With strict mode off, a part may run up to ten per cent over in exchange for fewer files.

How many parts can it produce?

Up to two hundred. Past that the result stops being useful and the tool asks for a larger limit instead, because two hundred attachments is no longer a solution to an attachment size problem.

Does my file go to a server?

No. The document is opened, cut and packed by your browser. It never leaves your device, there is nothing stored for us to see, and no account is involved at any point.