Split PDF by File Size
Divide into parts under a size limit. Runs entirely in your browser, so your data never leaves your device.
Drop a PDF here, or click to browse
Files never leave your device
Output
The result appears here as you type.
How to use Split PDF by File Size
- 1. Add your PDF. Drop a .pdf file into the workspace, particularly a large one. Split PDF by File Size loads its pages ready to divide based on a size limit you set.
- 2. Set the max part size. Max part size (KB) caps how large each resulting file can be. A lower value like 5000 KB produces more, smaller parts that fit under a strict attachment limit.
- 3. Let it divide the document. The tool groups consecutive pages into parts, keeping each part's total size under the limit you set, so a document with heavy images may split into more pieces than a text-only one.
- 4. Download the resulting parts. Save each of the generated PDF files once the split completes. Every part stays under the size cap you specified, ready to attach individually without exceeding a limit.
When to use Split PDF by File Size
Split PDF by File Size is for breaking a large document into pieces that each fit under a specific size limit, rather than an even page count. It's built for situations where a hard byte limit, not a page count, is the actual constraint you're working around.
- Fitting under an email attachment limit. A large scanned document exceeds a webmail provider's 25 MB attachment limit, and splitting it by file size produces parts that each clear the limit when sent as separate emails.
- Meeting an upload portal's file size cap. A government submission portal caps individual file uploads at a specific size in KB, and splitting a large supporting document by that limit produces compliant parts to upload one by one.
- Preparing files for a messaging app's transfer limit. A messaging app rejects large file transfers past a certain size, and splitting a bulky PDF by file size gets each part under that cap for a group chat.
About the Split PDF by File Size tool
Split PDF by File Size does its work locally, right in the browser. Divide into parts under a size limit. There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the PDF Tools collection on EditSafely, a set of 92 small, focused PDF utilities that share the same instant, private workspace.
You can shape the output with the Max part size (KB) setting, and the result refreshes the moment you change it. The finished file is put together in browser memory and saved with the Download button, so it never touches a server on the way to your disk.
Running locally also makes the tool fast and dependable: results appear as you type or drop a file, there is no server outage that can take it down mid-task, and confidential data can be processed without a second thought.
Frequently asked questions
Is Split PDF by File Size free to use?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Are my files uploaded to a server?
Everything happens locally. Your browser downloads the tool's code once, then does all the processing itself; nothing you enter is transmitted, stored or logged. You can even go offline after the page loads and it will still work.
Which files does Split PDF by File Size accept?
It accepts PDF documents. There is no file size cap imposed by a server; very large files are limited only by your device's memory.
Do I need to sign up or install anything?
No. The tool works in any modern browser on desktop, tablet or phone. There is no account to create, no extension to add and no software to install.
How do I save the output?
Click the Download button once the result is ready. The file is built in your browser's memory and handed straight to your downloads folder, without passing through a server.