About Optimize PDF
Optimize PDF online when you want to reduce PDF structural overhead rather than lower image resolution. The tool rewrites the document using object streams on your device. Compare the original and resulting sizes before choosing which copy to keep.
How to optimize a PDF file
- Select one PDF that does not require a password.
- Select Process to rewrite its internal structure using object streams.
- Compare the size summary, preview the result, and download it if it meets your needs.
A practical example
- Input
A PDF containing repeated structural objects or an older serialization.
- Result
optimized.pdf with a new object-stream-based serialization.
This example describes the transformation, not a guaranteed reduction. The output may be the same size or larger.
Supported input and limitations
- Embedded images are not downsampled or re-encoded. This is not a target-size compressor for scanned PDFs.
- One PDF up to 100 MB is accepted. Rewriting can affect digital signatures; retain the signed original.
Processing happens on your device. Read about local processing and optional workspace recovery.
Frequently asked questions
Why is my optimized PDF larger?
A PDF that is already efficiently encoded may gain overhead when rewritten. Structural optimization does not guarantee a smaller file.
Can I compress a scanned PDF to 100 KB?
There is no target-size setting and no image compression in this tool. Scanned pages usually require image downsampling or a specialized PDF compressor.