PDF Optimizer
Re-save PDFs to optimize their structure.
About this tool
PDF optimization can sometimes reduce file size by rewriting document structure and using object streams. Results depend on how the original PDF was created.
Learn how to reduce PDF file size in the PDF optimization guide. Need to combine documents first? Use the ToolAlto PDF Merger, then try the PDF merging guide for practical tips.
How to use it
- Select the PDF you want to optimize.
- Run the optimization process.
- Compare the original and resulting file sizes.
- Download the resulting PDF.
Privacy
The selected PDF is processed in your browser. The tool does not need to upload your PDF to a ToolAlto server.
Important note
Optimization does not guarantee a smaller file. Some PDFs are already compact, and the resulting file can be similar in size or larger. Password-protected or encrypted PDFs may not be supported.
Why use ToolAlto?
ToolAlto provides fast, free online tools for everyday tasks. We keep the experience simple, with no unnecessary signup.
Frequently asked questions
What does PDF optimization do?
Optimization can rewrite a PDF and reduce some unnecessary structural overhead. The amount of size reduction depends on the source PDF.
Will every PDF become smaller?
No. Some PDFs are already optimized, so the resulting file may be similar in size or occasionally larger.
Will password-protected PDFs work?
Password-protected or otherwise encrypted PDFs may not be supported by the browser-side PDF library.
Is the PDF optimizer free?
Yes. ToolAlto provides this online PDF utility for free.