Email bouncing because your PDF is too big? FlySnail's compress PDF tool reduces file size entirely inside your browser — your file is never uploaded. It works by re-rendering pages as compressed images, which is great for scanned documents and image-heavy PDFs. Pick a compression level, and get a smaller file back in seconds. It's free, with no account and no watermark. (For text-only PDFs you need to keep selectable, use a different approach — see the note above.)
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Compress PDF Online — Free & 100% Private
Shrink your PDF's file size right in your browser. Best for scanned and image-heavy documents.
Your file never leaves your device — nothing is uploaded
Heads up: to shrink size in your browser, this tool re-renders each page as an image. That means
text becomes part of the image and is no longer selectable or searchable. It works best
for scanned or image-heavy PDFs. For text documents you want to keep selectable, this isn't the right
tool.
Compression level
Reduce PDF file size while maintaining quality. Perfect for email attachments and faster sharing.
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Supports .pdf · all files are processed locally
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How to compress a PDF
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Add your PDFDrag it into the box, or click to browse.
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Choose a levelLight, Recommended, or Strong compression.
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CompressClick Compress — done locally in your browser.
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DownloadSave the smaller PDF. Nothing was ever uploaded.
Why use FlySnail to compress PDFs
100% private — no
upload
Adjustable compression
level
Instant — no queue
Free — no
sign-up
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Frequently asked questions
Is compressing PDFs free?
Yes — completely free, no sign-up, no watermark, no daily limit.
Is my PDF uploaded to a server?
No. Compression happens locally in your browser. Your file never leaves your device.
Will the text still be selectable after compressing?
No. Size is reduced by re-rendering each page as an image, so text becomes part of the
image and is no longer selectable or searchable. Best for scanned or image-heavy PDFs.
What kind of PDF compresses best?
Scanned documents and image-heavy PDFs shrink the most. Text-only PDFs may not shrink
much and will lose selectable text.
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