How do I split a PDF by file size?

Choose a size limit, upload your PDF, and it is split into parts that each stay under that limit, downloadable as a ZIP.

Is this size splitter free?

Yes, it is completely free and runs entirely in your browser.

What if one page is bigger than the limit?

A single page larger than the limit can't be split further — try Compress PDF first to shrink it.

Split PDF by Size

Split a PDF into multiple parts that each stay under a chosen file-size limit.

What is Split PDF by Size?

Split PDF by Size is a free online tool that lets you split a PDF into multiple parts that each stay under a chosen file-size limit. There is nothing to install and nothing to pay for — open the page, add your file, and you are ready to go in seconds. Because Split PDF by Size runs entirely in your web browser, it works the same on Windows, macOS, Linux, Android and iPhone, so you can split pdf by size from a laptop at your desk or a phone on the move.

Traditional PDF software is often slow, expensive and packed with features you will never touch. Split PDF by Size takes the opposite approach: it does one job — split pdf by size — and does it well, with a clean interface that anyone can use without a tutorial. Whether you handle documents every day or only occasionally need to split pdf by mb, you get a fast, reliable result without watermarks, sign-up walls or hidden daily limits.

Who is Split PDF by Size for?

Split PDF by Size is ideal for students assembling reports, office teams preparing handouts, and anyone who juggles several PDF files a day. If you have ever searched for a quick way to split pdf by size without downloading bulky programs or creating an account, this is built exactly for you. It fits neatly into everyday workflows for freelancers, students, small businesses and large teams alike.

Why use Split PDF by Size?

Reorganise large documents in seconds without expensive desktop software — completely free, with no account required.
Private by design: your files are processed in your browser and are not stored on our servers.
Works on any device and modern browser, with no installation or plugins.
No watermarks, no daily caps and no email sign-up to download your result.
A simple, distraction-free interface that makes it easy to split pdf by size on the first try.

When should I use Split PDF by Size?

Combine chapters, invoices or scanned pages into one clean, shareable file.
Prepare a document quickly before an important deadline or meeting.
Handle a one-off organize pdf task without buying a subscription.
Fix or adjust a file someone else sent you, right from your browser.

Is Split PDF by Size safe and private?

Privacy is a core part of how Split PDF by Size works. Wherever technically possible the entire process happens locally inside your browser, which means your documents are not uploaded, shared or kept after you leave the page. Nothing is added to your file — no tracking marks and no promotional watermarks — so the output is clean and ready to send, print or archive. This makes Split PDF by Size a safe choice even for sensitive material such as contracts, statements and personal records.

How do I use Split PDF by Size?

Choose the maximum size for each part.
Drop your PDF file into the upload area.
Click Split by size to create the parts.
Download all parts together as a ZIP.

How do I get the best results with Split PDF by Size?

Rename your files in the right order before uploading so the default sequence already matches what you need.
Use an up-to-date browser such as Chrome, Edge, Firefox or Safari for the smoothest experience.
For large files, give the tool a moment to finish — everything runs on your own device, so speed depends on your hardware.

Frequently asked questions

How do I split a PDF by file size?: Choose a size limit, upload your PDF, and it is split into parts that each stay under that limit, downloadable as a ZIP.
Is this size splitter free?: Yes, it is completely free and runs entirely in your browser.
What if one page is bigger than the limit?: A single page larger than the limit can't be split further — try Compress PDF first to shrink it.

Ready to split pdf by size? Add your file above to get started — it only takes a few seconds, it is completely free, and your documents stay private on your device. If you need to do more afterwards, explore our other Organize PDF tools to finish the whole job in one place.