Compress your PDF to reduce its file size
Make PDF files easier to email and upload by reducing their size; review image-heavy pages after compression for quality.
- 1 free task a day, no account needed
- No watermarks
- Encrypted in transit
- Deleted automatically
Compress PDF online, free
Compress a PDF into a smaller PDF for email, uploads or storage. Image-heavy PDFs often benefit most; compression can reduce image detail, so review the result before sending important scans.
Good for: email large reports, shrink scanned forms, fit portal upload limits.
- Easier sharing
- Stay in PDF
- Practical tradeoff
Easier sharing
Smaller attachments are less likely to run into email or upload size limits.
Stay in PDF
Download one compact PDF rather than separate page images.
Practical tradeoff
Choose the compression level in the existing editor to balance size and quality.
Works on any device
Compress PDF runs in the browser on Windows, Mac, Linux, iOS and Android. Nothing to install.
How to compress your PDF to reduce its file size
- 1
Upload the PDF you want to shrink.
- 2
Choose a compression setting in the editor.
- 3
Compress, review and download the smaller PDF.
Limits and formats
- Input
- Output
- Files per run
- Up to 3
- Max file size
- 25 MB for guests; free account 50 MB, Premium 500 MB
- Kept for
- 1 hour, then deleted
- Account
- Not required
Frequently asked questions
Will compression reduce image quality?
It can. Resampling or recompressing embedded images may soften photos and scans; compare the result against the original.
Will every PDF become smaller?
No. Already optimized documents may shrink little or can even grow after rewriting; image-heavy scans usually offer more savings.
Does compression change the format?
No. The output is a PDF, not a ZIP or image archive.
Can I compress a PDF on an iPhone?
Yes. Upload from a modern mobile browser and download the output to your device.
What is the free upload limit?
Guests can upload files up to 25 MB each. A free account raises the limit to 50 MB per file, and Premium allows 500 MB per file with larger batches.
Anything missing? Read how files are handled or write to support.
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Tools people use before or after Compress PDF.
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- Grayscale PDFNewConvert color PDF pages to grayscale for black-and-white printing.
- Resize PDFNewResize PDF pages to standard paper sizes with fit, fill or stretch.
- PDF to JPGExport PDF pages as compact JPG images with resolution and quality controls.
- Merge PDFJoin multiple PDF files into a single document in the order you choose.
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