SmartTools
Free online PDF tools
Free PDF Tool
Compress PDF Online
Reduce PDF file size online for free. Choose a target size in KB or MB, or select a compression level. Download is offered only when the resulting PDF is smaller than the original.
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Custom Target Size
Set a desired maximum size in KB or MB.
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Size Comparison
Compare the original and compressed PDF sizes.
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Local Processing
Your PDF is processed in your browser.
How to Compress a PDF Online
- Select the PDF file you want to reduce.
- Choose a target size or a compression preset.
- Click Compress PDF and wait for processing.
- Compare the file sizes and download the smaller PDF.
Frequently Asked Questions
Is this PDF compressor free?
Yes. You can use this SmartTools PDF compressor in your browser without uploading your file to our server.
Can I choose the output file size?
You can set a target in KB or MB. The tool tries different settings, but reaching the exact target cannot be guaranteed.
Will the PDF text remain selectable?
This version converts each page into an image. Text will no longer be selectable or searchable, and links, forms, bookmarks, and other interactive features may not be preserved.
Will every PDF become smaller?
No. Results depend on the original PDF and its contents. A download is offered only if the generated file is smaller than the original.
Note: This compression method converts pages into JPEG images. Large or complex PDFs may require significant browser memory. The requested target size is not guaranteed.