Slim your PDF in seconds.
Compress any PDF to an exact target size — 100KB, 200KB, 1MB and more. Free, no sign-up, and your files never leave your browser.
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100% Local ProcessingYour files stay on your device
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Zero UploadsNo tracking, nothing leaves
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Fast & EfficientSeconds, right in your browser
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Free Batch ModeNo limits, no registration
Drop your PDF here
or click to browse — multiple files = free batch mode
All files will be compressed to the same target size, one after another. Free batch — no per-file limits.
For files over 50 MB, a desktop tool may work better — but you can still try.
Compressing…
Preparing…
Done.
Something went wrong
Your files never leave your device. Total privacy, guaranteed by design.
Processing happens instantly in your browser. No waiting, no queue.
Press F12 and watch the Network tab: zero uploads, every single time.
Every tool, every batch, no hidden costs. Use unlimited.
How do we keep your files private?
Do you upload my files to a server?
Never. PDF Slim runs entirely in your browser — pages are rendered and re-encoded on your own device. Your files don't touch our servers for even a second.
How can I verify that myself?
Press F12 to open Developer Tools, click the Network tab, then compress a PDF. You'll see zero uploads. In fact, you can disconnect from the internet and compression still works.
Do you track me or use cookies?
No cookies, no tracking pixels, no analytics. There's nothing to sign up for and nothing stored about you — the only thing saved is a local counter of bytes processed on your own device.
Good to know
How does the compression actually work?
Pages are re-encoded as optimized images and repacked, step by step, until the file lands at your target size. Text-heavy PDFs shrink less than image-heavy ones — if your PDF is mostly text, we'll tell you honestly what's achievable.
Are there really no limits?
No 5 MB caps, no daily quotas, no accounts, no watermarks. Batch mode is free too — drop ten PDFs and they all get slimmed, one after another.
Why an exact size instead of "good enough"?
Government forms, job applications and school portals love arbitrary limits — 50 KB, 100 KB, 200 KB, 1 MB. Instead of guessing, pick the exact size your portal demands and get a file that fits, first try.
and counting — every byte stayed on a device like yours.