Compress PDF files privately
Choose lossless optimization, stronger image compression, or a target size. Your PDF stays on your device.
Drop your PDF here
or choose a file from your device
How can I reduce the size of a PDF?
SafePDFHub compresses PDF files in your browser using lossless optimization or image compression. Choose a compression mode or enter a target size, then review the actual output size before downloading. The achievable reduction depends on the document’s existing compression and image content.
- Input
- One PDF document
- Output
- A PDF with its actual compressed size shown
- Processing
- Local browser processing; device limits apply
Before you begin. A target size is a request, not a guarantee. Check that small text and scanned pages remain readable.
How to compress a PDF
Three simple steps. Your document stays on your device throughout.
- STEP 01
Select your PDF
Choose a PDF from your device.
No document upload required - STEP 02
Choose what matters
Select High Quality, Smart Compression, Maximum Reduction, or a target size in MB.
Quality, smaller size, or a size limit - STEP 03
Review and download
Compress, check the actual result size, and download your PDF.
See the actual size before saving
Not sure where to start? Try Smart Compression for everyday use. Set a target size when an upload form gives you a file-size limit.
Before you compress
Choose the right setting and know what to expect from your result.
Which compression option should I use?
High Quality uses lossless optimization. Smart Compression and Maximum Reduction can recompress supported JPEG images, with Maximum Reduction using lower image quality. PDFs with little compressible content may produce similar results across modes.
Can I compress a PDF to 1 MB, 2 MB, or 5 MB?
Enter your target size in MB. The tool tries to reach it while keeping a valid PDF. Some documents cannot reach the requested size; the result shows the actual size and whether the target was met.
What is the maximum PDF size?
Compress PDF accepts up to 300 MB on supported desktops. Phones and tablets may have lower limits based on available browser features and reported memory. The upload area shows this device’s limit. Smart Compression, Maximum Reduction and target-size attempts can reduce supported images up to this limit. Large-file processing requires temporary browser storage; resource or validation limits may retain a lossless result.
Will compression always make my PDF smaller?
No. Already optimized PDFs and unsupported image formats may offer little reduction. Image recompression can affect appearance, so check the downloaded PDF before sharing it.
Can I compress a scanned PDF?
Scanned PDFs store page content as images. Image compression can reduce supported image content, but the result depends on its resolution, encoding, and existing compression. Use a target size or an image compression mode and check the readability of small text in the downloaded file.
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