A large PDF can be difficult to email, upload to a form, or store on a phone. A PDF compressor reduces the file size by optimizing its contents. Smallpdf offers a browser-based compression tool with different levels, so you can choose a balance between a smaller file and image detail.
What Smallpdf’s Compress PDF tool does
Smallpdf lets you upload a PDF in a browser and download a compressed copy. Its current tool lists Basic compression as the free option, while Moderate and Strong compression may require Pro. Limits and plan details can change, so review the live tool before processing a batch.
How to compress a PDF online
- Open the Smallpdf Compress PDF tool.
- Select or drop in the file you want to reduce.
- Choose an available compression level and start processing.
- Download the new PDF, then compare it with the original.
Choose compression without losing important detail
Text-only documents often shrink differently from image-heavy scans. If a form, chart, or signature must remain clear, open the compressed version at normal and enlarged zoom. Check small print, photos, scanned pages, and any barcodes. If the result looks too soft, try a less aggressive setting or compress only the pages that need it.
When this workflow is useful
Smallpdf is convenient when you need a quick online PDF compressor without installing a desktop app. A browser tool also works across common devices. For confidential contracts or records, check the current data handling terms and your organization’s upload rules before using any cloud service.
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Can I compress a PDF for free?
Smallpdf currently offers a free Basic compression option. Other compression levels and usage limits can depend on the plan.
Will compression change the PDF?
Compression can reduce image detail or change file size. Always inspect the output when legibility matters.
Try it: Smallpdf PDF Compressor
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