FileopiaSplit PDF by file size
Split a large PDF into parts that each fit an email or upload size limit (for example 5 MB or 10 MB). Free, no upload, processed locally.
- Upload
- Options
- Download
- ✓ 100% free
- ✓ No sign-up
- ✓ No limits
- 🔒 Files never leave your device
How to: Split PDF by Size
- Select your PDF.
- Enter the maximum size per file in MB.
- Click Start and download the parts.
Email providers commonly cap attachments around 20–25 MB, and many upload portals accept far less. Split by Size cuts a big PDF into consecutive parts that each stay under the limit you choose, so you can send it in several messages or uploads.
Common uses
- Send a large scanned contract across several emails.
- Upload a long application file to a portal with a per-file size limit.
- Share big reports in chat apps that limit file sizes.
Tips for best results
- Compress the PDF first – you may not need to split at all.
- Set the limit slightly below the real cap to allow for email encoding overhead.
- A single page larger than the limit is saved on its own; compress that part separately.
Why use Fileopia for Split PDF by Size?
| Fileopia | Typical upload-based sites | |
|---|---|---|
| Files uploaded to a server | No – processed on your device | Yes |
| Sign-up required | Never | Often for bigger jobs |
| Hourly / daily task limits | None | Common on free plans |
| Watermark on output | Never | Sometimes |
| Works offline after loading | Yes, for most tools | No |
Your files never leave your device
Split PDF by Size runs entirely in your browser using JavaScript and WebAssembly. Your files are read from your disk into this tab, processed in memory and saved straight back to your downloads folder – they are never uploaded to Fileopia or any third party.
- Test it yourself: once this page has loaded, switch off Wi‑Fi or mobile data and run the tool – it keeps working.
- Check the network: open your browser’s developer tools (F12 → Network) while processing; you will see no file upload requests.
- Nothing to delete: close the tab and the data is gone – there is no server copy, no retention period and no account.
Frequently asked questions
What if a single page is bigger than the limit?
That page is saved on its own; try Compress PDF first.
Why is one part larger than my limit?
A single page can be bigger than the limit (for example a high-resolution scan). It is saved as its own file; Compress PDF usually fixes it.
Is Split PDF by Size really free?
Yes. Every tool on Fileopia is 100% free with no file limits, no sign-up and no watermarks. The site is supported by unobtrusive ads.
Are my files uploaded to a server?
No. Fileopia processes your files directly in your browser using JavaScript. Your documents never leave your device, so they stay completely private.
Does it work on mobile?
Yes. Fileopia works in any modern browser on Android, iPhone, iPad, Windows, Mac and Linux.