Compress PDF — Free
Reduce PDF file size for email, uploads, and fast sharing without losing readability. No signup required. Secure, fast, and free.
Drop your file here
or click to browse · .pdf · Max 25 MB free
How to Compress PDF
Upload your PDF file
Choose a compression level based on your target size and quality needs
Click 'Compress PDF' and review the new file size
Download instantly or retry with a stronger level if you need a smaller target like 100KB, 200KB, or 1MB
Frequently Asked Questions
1How do I compress a PDF online for free?
Upload your PDF to ZiaSign, choose a compression level (low, medium, or high), click 'Compress PDF', and download the smaller file. Free, no signup, no watermark.
2How much can I reduce the file size?
Typically 40-90% reduction depending on image content. Text-only PDFs see smaller reductions. Image-heavy PDFs can be compressed significantly.
3How do I compress a PDF without losing quality?
Start with low or medium compression if readability matters most. Text stays crisp at every level, and image-heavy files can usually be reduced substantially before quality loss becomes noticeable.
4Can I compress a PDF to 100KB, 200KB, 500KB, or 1MB?
Yes, often. The final size depends on how many images, pages, and scans are inside the file. For strict limits, try high compression first, then remove unneeded pages or compress a cleaner source file.
5Can I compress a PDF for email?
Yes. Use the high compression setting to get your PDF under typical email attachment limits (25 MB for Gmail, 20 MB for Outlook).
6Can I compress a PDF for portal uploads or application forms?
Yes. ZiaSign works well for submission-style limits where a portal asks for files below 100KB, 200KB, 500KB, or 1MB. If the limit is very strict, try high compression or split unnecessary pages first.
7Does the PDF compressor add a watermark?
No. ZiaSign never adds watermarks to compressed PDFs. The output is clean and professional.
8Is there a file size limit for compression?
Free users: 25 MB per file. Free account: 100 MB. Pro users: up to 300 MB per file.
Why Use ZiaSign's Compress PDF Tool?
ZiaSign's free PDF compressor helps you reduce PDF size online for email attachments, portal uploads, WhatsApp sharing, and strict submission limits like 50KB, 100KB, 200KB, 500KB, or 1MB. Choose the compression level that fits your goal, download instantly, and retry with a stronger setting if you need a smaller target. No watermark, no signup, and it works in any desktop or mobile browser.
Also known as: reduce pdf size · make pdf smaller · pdf compressor · shrink pdf · compress pdf online free
How-to guide
Prefer the step-by-step version first?
Step-by-step instructions to reduce pdf file size for email, uploads, and fast sharing without losing readability with ZiaSign.
Popular Ways to Use Compress PDF
Jump straight to the query-specific guide that matches what you are trying to do, then open the tool when you are ready.
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Open guideCompress PDF for WhatsApp Sharing
Shrink PDF files for faster phone sharing, messaging, and mobile-friendly downloads
Open guideCompress PDF on iPhone, Android, or Any Mobile Browser
Reduce PDF size on your phone without installing an app or desktop software
Open guideWhy teams stay with ZiaSign after the first quick fix
The strongest tool pages do not just solve one file problem. They make the next document task easier to start and easier to trust.
Secure file handling by default
Files are processed securely and automatically deleted after 1 hour so quick PDF jobs do not turn into storage risk.
118 tools and 139 workflow guides
Start with a single tool page, then move into guided document tasks without leaving the platform.
Free to start, deeper when the workflow grows
Anonymous tools cover quick fixes, while accounts, Pro, and Enterprise plans support heavier document operations.
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Trusted by thousands of professionals worldwide. All files are processed securely in your browser or encrypted servers and automatically deleted.
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