Split PDF by File Size
This size splitter breaks a large PDF into email-friendly chunks under 1–10 MB each.
Split a large PDF into smaller files under a target size (1–10 MB) for email and uploads — free in your browser.
Calculator Inputs
About Split by Size
This size splitter breaks a large PDF into email-friendly chunks under 1–10 MB each.
Upload a PDF and pick a max size per file. Pages are packed greedily — consecutive pages stay together — and each chunk downloads separately below. A single page larger than the target is emitted alone.
Processing uses the pdf-lib writer loaded from CDN, but your file never leaves the browser.
Where it is used
Email attachments with size limits, upload forms, splitting scanned batches for sharing.
How to use the Split by Size
- Select PDF — select a file (application/pdf,.pdf) — PDF up to 50 MB. Files never leave your browser..
- Max Size per File — enter the value.
- Calculate — press the Calculate button to see the result instantly above.
Formula
Greedily pack consecutive pages per chunk while saved bytes stay under the target size.
Examples
Example
targetMb:5
Result: Split files under ~5 MB (after selecting a PDF)
Frequently Asked Questions
- Are page ranges preserved in order?
- Yes — chunks contain consecutive pages in original order, so concatenating them restores the document.
- What if one page alone exceeds the target?
- It is emitted as its own file. Lower image-heavy pages with the compressor first if needed.