Reduce PDF file size for email, uploads, and fast sharing without losing readability. No signup required. 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 free
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
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.
Typically 40-90% reduction depending on image content. Text-only PDFs see smaller reductions. Image-heavy PDFs can be compressed significantly.
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.
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.
Yes. Use the high compression setting to get your PDF under typical email attachment limits (25 MB for Gmail, 20 MB for Outlook).
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.
No. ZiaSign never adds watermarks to compressed PDFs. The output is clean and professional.
Free users: 25 MB per file. Free account: 100 MB. Pro users: up to 300 MB per file.
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
See how ZiaSign compares on pricing, limits, and contract workflows before you commit.
ZiaSign vs DocuSign
Choose ZiaSign when you want contracts finished, not just sent.
ZiaSign vs Adobe Sign
Choose ZiaSign when signing is only one step in the work.
ZiaSign vs PandaDoc
Choose ZiaSign when the job is contract execution, not proposal design.
ZiaSign vs Smallpdf
Choose ZiaSign when the PDF is not the finish line.
ZiaSign vs iLovePDF
Choose ZiaSign when edited PDFs need accountable signatures.
ZiaSign vs PDF24
Choose ZiaSign when PDFs become agreements.
ZiaSign vs Sejda
Choose ZiaSign when the signed result matters more than the edit.
ZiaSign vs Zoho Sign
Choose ZiaSign when the document matters more than the suite.
ZiaSign vs SignNow
Choose ZiaSign when you'd rather pay for outcomes than access.
ZiaSign vs SignEasy
Choose ZiaSign when simple signing stops being enough.
ZiaSign vs Ironclad
Choose ZiaSign when you want CLM this quarter, not next fiscal year.
ZiaSign vs Icertis
Choose ZiaSign when you need contract intelligence working before the next board meeting.
ZiaSign vs Agiloft
Choose ZiaSign when you want outcomes out of the box, not a platform to configure.
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Choose ZiaSign when you want contract AI without a platform commitment.
Jump straight to the query-specific guide that matches what you are trying to do, then open the tool when you are ready.
Compress PDF for Email — Reduce File Size
Shrink PDF files to fit within Gmail, Outlook, and Yahoo email attachment limits
Open guideCompress PDF for Web — Optimize for Fast Loading
Reduce PDF file size for faster website downloads and better SEO
Open guideCompress Scanned PDF Documents
Dramatically reduce the file size of scanned PDFs with image-heavy content
Open guideCompress PDF to 50KB Online
Reduce a PDF to around 50KB for strict form, exam, and application upload limits
Open guideCompress PDF to 100KB Online
Shrink PDFs to fit common 75KB to 100KB upload limits for forms, resumes, and KYC documents
Open guideCompress PDF to 200KB Online
Reduce PDFs for medium-strict upload limits like forms, applications, and document portals
Open guideCompress PDF to 500KB Online
Shrink larger PDFs for sharing, uploads, and web downloads without over-compressing them
Open guideCompress PDF to 1MB Online
Reduce PDF files below 1MB for uploads, sharing, and faster delivery
Open guideCompress PDF for Uploads and Form Submissions
Reduce PDF size for portals, applications, resumes, and document uploads that reject large files
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 guideSolve this one task fast — free, secure, and private. The heavier document workflows are there only if you ever need them.
Files are processed securely and automatically deleted after 1 hour — nothing is stored unless you save it to a workspace.
A free account raises uploads from 25 MB to 100 MB, saves your results to a workspace, and unlocks 33 more tools — no card required.
Save the result to a workspace and send it for signature when the document needs one — the free plan includes 3 contracts a month.
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AI-Ready PDF Tools
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Contract Workflow
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AI Training on Data
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Security Roadmap
Quick PDF tools with secure processing. Files auto-delete after 1 hour and are never used to train AI models.
A free account unlocks 100 MB uploads, saves your progress to a workspace, and opens 33 more tools. Free forever — no card required.
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