Compress PDF
Reduce PDF file sizes locally in your browser with no upload and clear quality controls.
Input
Private by design: your PDF files never leave your device.
Compressing creates a new PDF file. Existing digital signatures therefore remain not cryptographically valid.
Applies moderate image compression. This may reduce image quality. With additional image compression, only a meaningfully smaller result is offered.
Good to know
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.
Typical searches include compress PDF, reduce PDF size, and shrink PDF file. 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.
How it works
How it works
Step by step
Features
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
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.
More tools
More tools
Merge PDF
Merge multiple PDF files locally in your browser into one new PDF using a custom order.
Split PDF
Split PDF files locally in the browser by pages, groups, halves, selection, or target size.
PDF to Images
Convert PDF pages locally without uploads to JPG, PNG or WebP images.
Extract images from PDF
Extract embedded images from PDFs locally, preview them, and download as PNG or JPEG.