PDF splitter by page or file size
Break a PDF into parts that fit upload limits.
Your inputs
Your results
Ready when you areYour results will appear here.
How it works
Split selected page groups into separate PDFs, or grow sequential parts while measuring serialized bytes against a chosen maximum file size.
Read the source reference ↗A few things to know
File-size mode supports at most 100 pages and cannot compress or divide a single oversized page. Group mode can repeat pages across parts. Unencrypted PDFs only. Input is limited to 25 MB total, 20 files and 200 pages; output to 50 MB. Copying pages does not preserve document-level forms, bookmarks, attachments or signature validity. Inspect the result before use.
When to use this tool
Split a document by explicit page groups or a measured output-size bound. The size mode preserves page contents rather than pretending to compress them.
- Fit a document to upload bounds.
- Separate a packet into parts.
- Export selected page groups.
How to use pdf splitter by page or file size
Prepare the inputs
Choose PDFs in the intended order or try the generated sample.
Choose the settings
Enter page selections or processing limits.
Review and export
Download the result and inspect pages, annotations and any forms before use.
Try the supplied example
Inputs
source: Generated sample; mode: Page groups; pages: 1-2;3; limit mb: 5
Result
The generated sample splits into pages 1–2 and page 3, with a download for each part.
What it means
Check each output’s page list and recorded byte size.
Common mistakes to avoid
Splitting is not compression
Splitting is not compression.
Overlapping groups duplicate selected content
Overlapping groups duplicate selected content.
Frequently asked questions
Definitions, edge cases, and practical next steps for this tool. Search all tool FAQs ↗
What does MiB mean?
1,048,576 bytes.
Can a single page be split by size?
No. Increase the limit or compress the document using another process.
How do I specify groups?
Separate groups with semicolons; within a group use page numbers or ascending ranges separated by commas.
Can groups overlap?
Yes. A page can appear in different output parts.
Are output sizes actually measured?
Yes. Serialized PDF bytes are measured and checked in size mode.
Are encrypted PDFs supported?
No. They are rejected.
Are my inputs uploaded or stored?
Processing happens locally in your browser. This tool does not upload inputs. Downloads stay on your device; sharing or opening them in another service is your choice.
What should I check before using the output?
File-size mode supports at most 100 pages and cannot compress or divide a single oversized page. Group mode can repeat pages across parts. Unencrypted PDFs only. Input is limited to 25 MB total, 20 files and 200 pages; output to 50 MB. Copying pages does not preserve document-level forms, bookmarks, attachments or signature validity. Inspect the result before use.
Explore the topic in the blog
Sources and method
Use the references below to check definitions and platform guidance. The model’s scope and limits are explained above. Read our editorial standards.