Nothing is more annoying than a bounced email: “attachment too large.” Here's how to shrink a PDF so it sails through Gmail, Outlook and Yahoo — free, in your browser, without uploading your file anywhere.
Short answer: most email providers cap attachments at 20–25MB (Gmail: 25MB, Outlook: 20MB, Yahoo: 25MB, iCloud: 20MB). If your PDF is bigger, compress it in your browser — scanned PDFs often shrink 80–90%. If it's still too big, split it into parts or send a cloud-drive link instead of the file.
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Open the Free PDF Compressor →Email was never designed for large files. Providers enforce hard attachment limits, and — the part people miss — the recipient's provider has limits too. A 24MB file that leaves your Gmail can still bounce off a corporate inbox capped at 10MB. Encoding overhead also inflates attachments by roughly a third in transit, so a “24MB” PDF is really pushing 32MB on the wire.
The usual culprits behind oversized PDFs: phone photos pasted into documents, scanned pages saved at 300+ DPI, embedded high-resolution images in presentations, and digitally-signed files with heavy certificate data. The fix depends on the cause — but for the most common case, a scanned or image-heavy PDF, browser compression solves it in under a minute.
The most generous mainstream limit, but encoding overhead means staying under ~20MB is safer in practice.
Microsoft's default cap is 20MB (some business accounts allow 25MB). Outlook will offer to upload to OneDrive instead — accept the offer for big files.
Matches Gmail on paper. Large PDFs still send slowly on mobile data, so compress anyway.
Apple's limit; Mail Drop can handle up to 5GB via iCloud link for recipients in the Apple ecosystem.
ZIP compression does almost nothing to already-compressed PDF content — expect 1–3% savings. Compress the PDF itself instead; that's where the real megabytes are.
For anything over 50MB — or when sending to many people — a Drive/Dropbox link is faster, doesn't clog inboxes, and lets you update the file after sending.
Text stops being selectable and searchable after image-based compression. For an emailed report or scan that's fine; for a contract the recipient must search, keep quality higher.
Screen (72 DPI) is fine for casual sharing, but invoices, contracts and anything official deserve Balanced (100 DPI) or better. When in doubt, send the clearer version.
Many “free” compressors upload your file to their servers. Ours doesn't — everything runs locally in your browser, which is the only safe way to handle contracts, medical records or financial statements.
Corporate inboxes are often capped at 10MB. If your email bounces despite being under your provider's limit, the other side's server is the problem — send a download link instead.
It depends on your provider: Gmail and Yahoo allow 25MB, Outlook and iCloud cap at 20MB. In practice, stay a few megabytes under the limit because encoding inflates attachments by about a third in transit.
Gmail's hard limit is 25MB per email including all attachments. A 30MB PDF exceeds it, so Gmail blocks the send. Compress the PDF below ~20MB or let Gmail upload it to Google Drive and send a link.
Barely — ZIP typically shaves only 1–3% off a PDF because PDF content is already compressed. Re-compressing the PDF's images at lower quality is vastly more effective, often cutting 70–90%.
It depends on the setting. Balanced (100 DPI) keeps documents perfectly readable on screen while cutting most of the size. Only the smallest preset (72 DPI) visibly softens fine print — fine for casual sharing, not for official documents.
Only if the tool processes files locally. Server-based compressors receive a full copy of your document. This site's tools run 100% in your browser — the file never leaves your device, so sensitive documents stay private.
Split it into smaller parts and send multiple emails, or upload it to Google Drive, Dropbox or OneDrive and email a download link. For files over 50MB, a link is better than any attachment.