Free Split-by-Size Tool
Split PDF by file size online free
Break a large PDF into multiple files that each stay under a size limit you choose — useful for portals with a strict upload cap. Use the tool below, then download a ZIP of the parts.
Browser-based split by file size
Open a PDF, set a maximum size per part, and download a ZIP of files that each stay under that limit — grouped by size, not by page count.
Your files are handled safely
✔ Processing happens in your browser
✔ Your file is never uploaded to a server
✔ Your files are not stored or saved anywhere
✔ No account or sign-up required
Why Use It
Common reasons to split by size
Fit strict upload limits
Get every part under a portal's exact size cap instead of guessing how many pages fit.
No manual page counting
Set a size limit in MB and let the tool decide where each part breaks.
One ZIP download
All parts are bundled into a single ZIP file for a quick download.
How It Works
Simple 3-step workflow
1. Choose your PDF
Choose the PDF file you want to split.
2. Set a maximum size
Enter the maximum size, in MB, for each part.
3. Download the ZIP
Save the ZIP file containing every part.
Trust & Organization
The opposite problem from Compress PDF
If a single-part file is still too big even after this, try compressing it first, or lower the size limit here to get more, smaller parts.
FAQ
Split by file size questions
How is this different from the regular Split PDF tool?
The regular Split PDF tool splits by page number or range. This tool splits by file size, adding pages to each part until it would exceed the limit you set.
What if one page alone is bigger than my limit?
That page is kept as its own part rather than being dropped. The result message tells you if this happened.
How do I download multiple parts?
All parts are bundled into a single ZIP file for one download.
Is my file uploaded to a server?
No. Splitting happens entirely in your browser. Nothing is uploaded or stored.