Shrink your PDF without losing a thing.
Compress big PDFs to email-friendly size. Smart compression keeps text crisp and images sharp.
From zero to edited PDF in under a minute
Three steps. No downloads, no tutorials, no surprises.
Drag and drop or click to browse. We support files up to 100 MB.
Choose low, medium, or max quality. Preview the size before you save.
Get your smaller PDF instantly. Email it or store it — same readability.
Everything you need to compress a PDF.
No Acrobat, no installs. Smart shrinking that keeps text crisp and images sharp.
Low, medium, max — preview the size difference before saving.
Auto-downsamples photos but keeps logos and line-art razor-sharp.
A 40 MB scan becomes 2 MB. Email it. Done.
Compress a folder of contracts in one go. With 7-day access.
AI-powered features to compress PDFs faster.
Beyond manual edits — let CosmicPDF read, understand, and act on your documents.
Automatically detect scanned vs text PDFs and suggest the best compression level.
See estimated file size before you download — no guesswork for email limits.
Compress up to 50 files with consistent settings in one session.
Your document content is never used to train models. Auto-delete in 2 hours.
Built for anyone stuck with a PDF.
Five tools, one workflow. Pick the one that matches your day.
Annotate notes, highlight sources, and submit work in the right format.
Contracts, proposals, and NDAs. Fast signing and collaboration with no extra tools.
Review long documents, redact precisely, and protect sensitive info.
Invoices, quotes, and receipts that arrive as PDFs and need quick tweaks.
Everything a desktop editor does. Without the desktop editor.
For 90% of PDF compress jobs, you don't need a $180/year program.
| CosmicPDF | Desktop editors | |
|---|---|---|
| Setup | check_circle Zero — in your browser | cancel Download + activator |
| Time to first compress | check_circle Under 10 seconds | cancel 5–10 minutes |
| Works on mobile | check_circle Yes | cancel No |
| Signup to start | check_circle Optional · only to save your work | cancel Account required upfront |
| Watermark on export | check_circle Never | cancel Depends on plan |
Your documents are yours. Period.
We know a PDF can hold a contract, a payslip, or an ID. That's why we handle your files the way a bank would.
Your files are transmitted with the same encryption your bank uses. No one else can see them in transit.
Your PDFs are deleted from our servers automatically. We keep no copy and never look at them.
We don't read, index, or use your documents to train any model. GDPR compliant.
Audited annually. Data stays in-region. Full data-export and delete on request.
What our customers say
240,000+ reviews. 4.8 stars on Trustpilot.
“Our 38 MB contract packet wouldn't attach. Compressed to 3 MB in under a minute — client got it same afternoon.”
“Scanned worksheets were killing our LMS upload limit. Batch compress saved the semester.”
“The preview before save is clutch — I know it'll fit Gmail before I hit send.”
Try CosmicPDF risk-free
Four reasons our customers stay — and why you can leave without losing a thing.