Split PDF by Size
Split a large PDF into smaller parts under a size limit you choose — built for 25MB email attachments and portal upload caps.
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About Split PDF by Size
The Split PDF by Size tool by PdfPixels divides a PDF into parts that each stay under your chosen size limit (for example 25MB for Gmail). Upload the PDF, pick a limit, and download a ZIP of the parts for free.
Split PDF by Size divides a large PDF into several smaller PDFs that each stay under a size limit you choose — 25MB for Gmail, 20MB for Outlook, or whatever a portal demands. The tool adds pages part by part, measures the real saved file size after every page, and closes each part just before the limit is crossed, so results are accurate rather than estimated. Parts keep the original page order and are returned as a ZIP. Processing runs on our servers.
Key Features
- Choose any limit from 1MB to 25MB
- Measures actual saved file size per part — not an estimate
- Keeps original page order across all parts
- Returns every part in one ZIP download
- Free with no signup; server-side processing
Who Uses This Tool?
- 1Getting under Gmail’s 25MB attachment cap without re-scanning
- 2Meeting strict upload ceilings on job, visa, and grant portals
- 3Sharing one long contract across several emails in order
- 4Breaking a huge scan into chunks a slow connection can upload
How to Use Split PDF by Size
Upload the large PDF
Drop the file that is too big to send or upload.
Pick a size limit
Choose a limit such as 25MB, 10MB, or 2MB per part.
Download the ZIP
Parts arrive in order — part-1.pdf, part-2.pdf — inside one ZIP.
Troubleshooting & Common Problems
Still too many parts for the portal
A lower limit creates more parts. If the portal accepts ZIP files, send one ZIP instead of many PDFs.
Parts are under the limit but the email still fails
Email providers add encoding overhead (roughly a third larger). Pick a limit about 25% below the provider’s stated cap.
Frequently Asked Questions
01How does splitting by size work?
The tool copies pages into a new document one at a time, saves after each page, and starts a new part when the next page would push the file past your limit. Every part is a real PDF that opens on its own.
02What if a single page is bigger than my limit?
That page becomes its own part even though it exceeds the limit — a single page cannot be divided. Compress the PDF first if that page must come under the cap.
03Will splitting change how the document looks?
No. Pages are copied unchanged; fonts, images, and layout stay exactly as they were. Bookmarks that span parts may be dropped.
04Is Split PDF by Size free?
Yes — free with no signup. Fair-use rate limits apply.
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Keep the workflow moving
Next steps after Split PDF by Size
Pair this tool with adjacent workflows, practical use cases, comparison guides, and in-depth reading so users can complete a full document journey without friction.
Related tools
Adjacent workflows users commonly open next.
Merge PDF
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Split PDF
Extract pages or split PDF into multiple smaller files.
Reorder PDF Pages
Drag and drop to rearrange pages in your PDF.
Delete PDF Pages
Remove unwanted pages from any PDF document.
Extract PDF Pages
Select and extract specific pages or page ranges from a PDF file into a new standalone document.
Rotate PDF
Rotate PDF pages 90°, 180°, or 270°.
Popular use cases
Practical scenarios and intent-driven landing pages.
Further reading
Step-by-step guides that go deeper on this workflow.