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Some files are simply too big for the place they need to go. Many email services stop attachments at around 20 or 25 MB, and tax, insurance, and court portals often cap each upload at 5 or 10 MB. Split PDF by Size solves this without touching quality. Enter the maximum size you want per part, and the tool divides the document into consecutive page groups planned around that number. A live preview shows each part and its page range before you split. Page order stays exactly as it was, so the parts read like the original when opened one after another. Everyday splits run in your browser on your device. A large Pro file is sent to our server. Download all parts together in one ZIP, free of ads and watermarks.
How to split a PDF by size online
- 1Add the large PDF by dropping it into the box above or tapping Choose files on your phone or computer.
- 2Type the maximum size per part in MB, for example 9 for a 10 MB portal limit or 2 for a small email attachment.
- 3Review the live preview to see how many parts you will get and which pages each one holds.
- 4Select Split by size and download your smaller PDFs, bundled together in one ZIP.
Why split large PDFs by size here
- Size you choose — set any target from 0.5 MB up to 100 MB per part
- Built for real caps — email attachments, court filings, tax forms, and school or job portals
- Live part preview — see each part and its page range before you split
- Order kept intact — pages stay in sequence, so the parts read like the original
- Quality untouched — pages are divided, not recompressed, so text and scans stay sharp
- Free and private — split in your browser on Free, or on our server for a large Pro file, with no watermark, no ads, and no sign-up
Split PDF by Size FAQ
Is it free to split a PDF by size?
Yes. It is part of your free daily uses and covers PDFs up to 100 MB and 150 pages, which suits most scans and reports that bounce back from email. The parts you download have no watermark. Pro handles bigger files, up to 100 MB, for large archives and long scanned records.
Is my document safe when I split it by size?
Yes. For free users, the split happens in your browser, on your own device, and the PDF is not sent to our servers. For Pro users, very large documents can be split with secure cloud processing, with temporary files removed automatically once the job is finished.
Will every part be exactly the size I enter?
Parts are planned around your target by grouping pages evenly, so most land close to it. Pages full of photos weigh more than text pages, so for a strict cap, choose a target a little below the limit, such as 8 MB for a 10 MB portal. The preview shows your parts before you split.
How do I split a PDF for email attachments?
Check your email's attachment limit, then enter a smaller number as the size per part, for example 10 MB. Split the file and download the parts. Send them in separate emails, or together if they fit. The files are already named Part 1, Part 2, and so on, so the recipient knows the order.
Can I split a big PDF on my phone?
Yes. Open the page in Safari or Chrome on iPhone or Android, choose the PDF from your Files app or downloads, and type your size in MB. The parts save to your device, ready to attach in your mail app. It works the same way on Mac, Windows, and tablets, with nothing to install.
What is the largest PDF I can split by size?
Free handles PDFs up to 100 MB and 150 pages, enough for most oversized scans and reports. Pro takes files up to 100 MB and 200 pages, which helps with long scanned archives and image-heavy manuals. You can set each part anywhere from 0.5 MB to 100 MB.
What if one part is still bigger than my limit?
Split again with a lower target, or run that single part through Compress PDF to shrink it before you send it. A page packed with high-resolution photos can be heavy on its own, and compressing it usually brings the part comfortably under common email and portal limits.
Should I compress or split my PDF?
Choose Compress PDF when the destination wants one file and a smaller size is enough. Choose splitting by size when the portal accepts several files or sets a cap per file. You can also combine both: compress first, then split what is left. Later, Merge PDF puts the parts back into one document.
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