When this tool is useful
Preparing sequential document parts for an upload, email, archive, or case system with a strict per-file size limit.
How local processing works
Pages are copied in physical order and each candidate part is serialized to measure its actual output bytes; a page starts the next part when adding it would cross the selected ceiling.
How to use it
- Prepare Split PDF by file size: Work from a copy and confirm the target bytes rather than rounded labels, physical page order, actual size of every generated part, the largest one-page output, output count, and destination overhead. Keep every source unchanged.
- Run Split PDF by file size: Process only in this browser. Pages are copied in physical order and each candidate part is serialized to measure its actual output bytes; a page starts the next part when adding it would cross the selected ceiling.
- Download and verify: Save under a new name. Check every saved file's byte size in the filesystem, confirm continuous first and last pages across parts, add the destination's packaging overhead, and test the strictest real upload before discarding nothing.
Important limitations
The byte ceiling is enforced on this tool's serialized output, not on a future mail or storage wrapper. A single-page PDF larger than the target cannot be split further without changing page content, so the operation fails instead of claiming an exact target.
Verify the downloaded result
Check every saved file's byte size in the filesystem, confirm continuous first and last pages across parts, add the destination's packaging overhead, and test the strictest real upload before discarding nothing.
Private by design
Your files stay in this browser. The tool does not upload the source or output to our servers.
Questions and answers
When is Split PDF by file size useful?
Preparing sequential document parts for an upload, email, archive, or case system with a strict per-file size limit.
How does Split PDF by file size work?
Pages are copied in physical order and each candidate part is serialized to measure its actual output bytes; a page starts the next part when adding it would cross the selected ceiling.
Which limits require attention?
the target bytes rather than rounded labels, physical page order, actual size of every generated part, the largest one-page output, output count, and destination overhead. The byte ceiling is enforced on this tool's serialized output, not on a future mail or storage wrapper. A single-page PDF larger than the target cannot be split further without changing page content, so the operation fails instead of claiming an exact target.
How should I verify the result?
Check every saved file's byte size in the filesystem, confirm continuous first and last pages across parts, add the destination's packaging overhead, and test the strictest real upload before discarding nothing.