About the PDF Split by Size
Email, forms and upload pages often refuse files over a certain size. Instead of choosing page ranges by trial and error, tell this tool the largest size you can send, for example 10 MB, and it cuts the PDF into consecutive parts that each stay under that limit. It makes each part as large as it can while still fitting, so you get the fewest files possible, and it tells you which pages are in each. If a single page is bigger than the limit on its own, it is kept as its own part and flagged, because no splitting can make one page smaller. You can download the parts one by one or all together in a ZIP. The work is done in your browser and nothing is uploaded.
Updated October 2026
How to use the PDF Split by Size
- 1Pick the PDF you want to split.
- 2Choose the largest size for each part, or type your own in megabytes.
- 3Press Split the PDF and wait while the parts are measured.
- 4Check the list of parts and the pages in each.
- 5Download single parts or press Download all as ZIP.
When splitting by size helps
File size limits are a common problem. A scanned contract of 60 MB cannot go through an email system that stops at 25 MB, and a government form may accept only 5 MB per file. Splitting by size gives you files that fit, in page order, so the receiver can read them one after the other.
Because pages carry different amounts of data, a page of photos can be many times larger than a page of text. The tool measures real file sizes rather than guessing, so each part really is under your limit.
If the parts are still too big
- Compress the PDF first; scans often shrink a lot.
- Resize the pages if they are far larger than needed.
- Remove pages you do not need before splitting.
- Choose a smaller limit so that more parts are made.
- For scans, converting pages to a lower resolution gives the biggest saving.
Related tools
For a page-range split, use Split PDF, and to shrink the file first try Compress PDF. Resize PDF changes the page size, Merge PDF joins the parts back into one file, and Delete PDF Pages removes pages before you split. Keep the original file safe, because splitting is easy but joining the parts back needs care.
Features
- Splits at the size you choose, from 0.05 to 500 MB
- Fewest possible parts
- Shows pages and size of every part
- Flags a single page that is over the limit
- Download one by one or as a ZIP
- Page order and quality unchanged
- Private, no upload
Frequently asked questions
How does splitting by size work?
The tool adds pages one after another and checks the size of the file it would produce. It keeps going while the part is under your limit, then starts a new part.
Why is a part sometimes a bit smaller than the limit?
The next page would not fit under the limit. The tool never goes over, so a part can be a little under the limit.
Why is the total of the parts bigger than the original?
Each part carries its own copy of shared items like fonts and images. Splitting can therefore add some size overall. Compress the file first if size is the main problem.
What if one page is larger than my limit?
A single page cannot be divided. It becomes its own part and is marked as over the limit. Compress the PDF or lower the picture quality to shrink it.
What size limit should I choose for email?
Gmail and Outlook allow about 25 MB and 20 MB including the message and encoding, so choose 15 to 18 MB to be safe. Some company systems allow only 5 or 10 MB.
Does splitting reduce quality?
No. Pages are copied as they are, without re-compressing images or fonts.
Is my PDF uploaded?
No. The splitting happens in your browser.