Shrink large PDFs to easily send them via Gmail, Outlook, Yahoo, and corporate mail servers. Keep text sharp and stay comfortably under email attachment caps.
Your files are never uploaded to our servers — all compression happens right inside your browser
or pick several files at once from your device
Most email providers enforce strict ceiling limits on total attachment size. If your PDF exceeds these limits, your email will fail to send or bounce back immediately:
Email protocols encode binary files into MIME Base64 text, which expands file size by approximately 33%. A 20 MB PDF can easily become 26.6 MB during transmission, triggering a rejection on a 25 MB limit server. We recommend reducing email PDFs to under 10 MB — or ideally 1 MB to 3 MB for instant recipient downloads.
For multi-page invoices, contracts, and proposals, choose the Balanced preset. If your PDF is heavily photographic or a scanned document, the Smallest Size preset or a target size of 2 MB ensures rapid delivery without clogging the recipient's inbox.
Invoices, agreements, and CVs frequently contain personal identifiers, bank account numbers, and addresses. Because Kompres PDF compresses files directly in your browser, your sensitive email attachments are never exposed to cloud servers.
Gmail has a 25 MB limit for incoming and outgoing messages. However, due to MIME encoding overhead, any PDF larger than approximately 18–19 MB is likely to be rejected. Aim for under 10 MB for seamless delivery.
Most corporate Outlook Exchange servers enforce a 20 MB or 10 MB attachment cap. Furthermore, base64 encoding inflates file size by about 33%. Compressing the PDF to under 5 MB resolves this issue.
Yes. The Balanced preset maintains crisp text and clear image resolution for reading on monitors, smartphones, and printing on standard office laser printers.