Compress PDF — Free
Reduce PDF file size for email, uploads, and fast sharing without losing readability. Free to run. No card. Email only if you want to download. Files are processed securely and auto-delete after 1 hour — nothing is stored unless you save it.
Drop your file here
or click to browse · .pdf · Max 25 MB per file
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
Common questions
Frequently Asked Questions
How 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 to run. No card. Email only to download. No extra watermark.
How 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.
How 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.
Can 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.
Can 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).
Can 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.
Does the PDF compressor add a watermark?
No. ZiaSign never adds watermarks to compressed PDFs. The output is clean and professional.
Is there a file size limit for compression?
Anonymous users can upload files up to 25 MB. A free account and paid PDF-tool plans support files up to 100 MB, with a 100 MB combined input limit for one operation.
Next step
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