PDF Compressor
Compress PDF files online for free. Reduce file size while maintaining quality. Perfect for email attachments and sharing.
Free tier: PDF · up to 25 MB
Drop your PDF here, or click to browse
PDF · up to 25 MB free
Compression Level
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How to compress a PDF online for free
- Upload your PDF — drag and drop or click to browse (up to 25 MB free, no signup needed)
- Choose a compression level: Low preserves image quality, Medium balances size and clarity, High or Maximum minimises file size
- Click Compress PDF and wait a few seconds while the server processes your file
- Review the before/after size stats, then click Download to save your smaller PDF
Why use our PDF Compressor?
Large PDFs are a daily headache — email services cap attachments at 10–25 MB, upload portals reject oversized files, and cloud storage fills up fast. Our compressor typically reduces file size by 40–80% without visibly degrading text or vector graphics, making it practical for email submissions, government portal uploads, and sharing on WhatsApp or Slack.
Your privacy is protected by design. Files are processed entirely in-memory on our server and the compressed PDF is streamed back immediately — nothing is written to disk, logged, or retained after your download. No account required, and there are no watermarks added to the output.
The tool handles scanned PDFs especially well. Scans are essentially high-resolution raster images, so choosing Medium or High compression on a scanned document routinely cuts size by 60–80% while keeping the text legible on screen and in print.
Frequently Asked Questions
The tool sends your PDF to our server, where PyMuPDF iterates every embedded raster image, downsamples it to the target DPI, re-encodes it as JPEG at the chosen quality level, then saves the PDF with aggressive object-level deflate compression. Text, vectors, and fonts are preserved intact.
No. PDF text is stored as vector data, not as raster images, so it remains perfectly sharp at any zoom level regardless of the compression level chosen. Only raster images embedded in the PDF are affected.
Medium is the best starting point for most files — it typically cuts file size by 40–70% with barely noticeable image quality change. Use Low if you need to preserve image fidelity for printing. Use High or Maximum when the smallest possible file size matters more than image quality, such as for web delivery or email attachments.
Some PDFs are already well-optimised or contain mostly text and vector graphics with no high-resolution raster images. In that case, this tool has little to recompress and the resulting file may be the same size or marginally larger due to overhead. Try the Maximum level for the best chance of a reduction.
No. Password-protected PDFs are encrypted and cannot be processed. Remove the password using your PDF reader (File → Properties → Security) before uploading.
Free users can compress PDFs up to 25 MB. Pro users get up to 200 MB. There is no limit on the number of pages.
No. Your PDF is processed entirely in-memory and the compressed result is streamed back immediately. Nothing is written to disk or retained after your session.
Yes. Scanned PDFs are essentially PDFs made entirely of high-resolution raster images. This tool is especially effective for them — scanned documents often compress by 60–80% because the original scan resolution far exceeds what is needed for screen or standard printing.