Compress PDF
Runs locally in your browser. Nothing leaves your device.Reduce PDF file sizes locally in your browser with no upload and clear quality controls.
How it works
- 1
Add PDF(s)
Choose one or more local PDF files to compress.
- 2
Choose the compression strength
Optionally enable additional image compression and choose between “Balanced” and “Strong”.
- 3
Download the result
Download the compressed files individually or together as a ZIP.
Good to know
Compress PDF shrinks PDF files directly in your browser by testing two methods and automatically keeping whichever produces the smaller result: lossless structural optimization and additional image compression at a chosen strength. Multiple files can be processed at once and are available individually and together as a ZIP for download.
Processing runs entirely locally in the browser. Already optimized PDFs or files with little image content sometimes shrink only slightly, because lossless optimization already produces the smallest sensible result in that case.
Typical use cases
Get a PDF under a size limit for email
Shrink a PDF specifically when it exceeds the attachment limit of an email inbox or a form.
Batch-shrink multiple scanned documents
Process several PDF files at once and download the result together as a ZIP archive, instead of compressing each file individually.
Shrink archive PDFs without visibly degrading quality
Use lossless optimization when structure and image quality must remain fully intact, for example for legally relevant or archived documents.
Tips for better results
Pick the preset that matches your goal
“Balanced” compresses images moderately with little quality loss, “Strong” achieves smaller files with visibly lower image quality. The tool automatically keeps whichever is smaller between lossless and additional image compression anyway.
Also remove metadata
Enable removal of classic PDF info and XMP metadata for additional space savings and to avoid passing on details such as author or authoring software.
Features
Automatically picks the smaller result
Tests lossless optimization and additional image compression, and keeps whichever file is smaller.
Compress locally
Compression happens directly in the browser, without uploading the PDF files.
Multiple files as a ZIP
Compress several PDFs at once and download them individually or together as a ZIP archive.
Frequently asked questions
How exactly does PDF compression work?
The tool tests lossless structural optimization and, if enabled, additional image compression at the chosen strength, and automatically keeps the smaller result.
Why does my file barely shrink?
Already optimized PDFs or files with little image content often can only shrink to a limited degree structurally, because lossless optimization already produces the smallest sensible result.
Are my PDF files uploaded while compressing?
No. Compression runs entirely locally in the browser; the files never leave your device.
What happens with password-protected PDFs or digital signatures?
For password-protected PDFs, the tool asks for the password to process them. Because compression creates a new PDF file, any existing digital signatures are no longer cryptographically valid in it.
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