# Split PDF by Size — Free Online (PdfPixels)

> Split a large PDF into smaller parts under a size limit you choose — built for 25MB email attachments and portal upload caps.

Canonical URL: https://www.pdfpixels.com/tools/split-pdf-by-size
Processing: server
Cost: free, no signup required for core use.

## Short answer

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.

## About

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

## How to use

1. **Upload the large PDF** — Drop the file that is too big to send or upload.
2. **Pick a size limit** — Choose a limit such as 25MB, 10MB, or 2MB per part.
3. **Download the ZIP** — Parts arrive in order — part-1.pdf, part-2.pdf — inside one ZIP.

## FAQ

### How 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.

### What 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.

### Will 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.

### Is Split PDF by Size free?

Yes — free with no signup. Fair-use rate limits apply.

## Limits

- PDF tools: 50 MB per file. Merge: 20 files / 100 MB total / 1000 pages.
- Image tools: 25 MB, 50 MP max. AI tools: 20 MB.
- Rate limits: 20/min per processing route per IP.
- Server-side files are processed ephemerally and purged automatically within 60 minutes.

More tools: https://www.pdfpixels.com/tools — Full machine reference: https://www.pdfpixels.com/llms-full.txt