Compress a PDF

Pick a quality level, drop your PDF, and compare sizes before you download. Your file never leaves your device.

Files are processed entirely in your browser. Your file's contents never leave your device.

Your PDF never touches a server. There's nothing here to ration.

No daily caps. No spinner that turns into a paywall after the third file.

Private by architecture

Your PDF never leaves your device.

Unlimited use

No daily caps or hourly throttling.

No signup, no watermarks

Every tool below works with or without an account.

Works offline

A tool you've already loaded keeps working offline.

About this tool

Compression is almost always about a limit somewhere else. The email attachment cap, the portal that rejects anything over 10 MB, the form that wants "under 2 MB," the folder of scans eating your storage. Three presets here: High quality when the document still has to print well, Balanced for everyday sharing, and Smallest when there's a hard cap to get under. Before and after sizes show up immediately, with a preview, so you can judge the tradeoff yourself.

Under the hood, PDFium (the engine behind this site's editor) re-renders each page at the preset's resolution and rebuilds the document around efficiently compressed images. That approach works best on exactly the files that tend to be bloated: scans, photographed documents, image-heavy decks, where 60-90% reductions are normal. The catch is that rebuilt pages are images, so text that was selectable stops being selectable. The tool notices when that's about to happen and warns you before the download, not after.

There's no upload queue, no daily limit, and no server holding a copy of your contract while it shrinks. If the result ever comes out bigger than the original, which can happen with already-optimized digital PDFs, the single-file view says so plainly instead of serving you a worse file behind a green checkmark (convert files one at a time to see the before/after sizes). Either way your original isn't touched; the compressed copy downloads under its own name.

Frequently asked questions

How much smaller will my PDF get?
Scans and image-heavy files usually drop 60-90% on Balanced. A digital PDF that's already well optimized might barely shrink, or even grow. Convert it on its own and the tool shows the before/after sizes and tells you, so you can just keep the original.
Will the text still be selectable after compression?
No. Pages get rebuilt as high-quality images, so selectable text becomes part of the picture. When you convert a single file, the tool warns you first if the PDF has a text layer. Small-and-selectable is on the roadmap.
Which preset should I pick?
Balanced, most of the time. Go High quality if it will be printed, Smallest when you have a hard cap to duck under. After converting a single file you can switch presets and it re-compresses from your original on the spot; files finished in a multi-file batch keep the preset they were converted with. Remove and re-add one to redo it.
Is my file uploaded to a compression server?
There's no compression server to upload to. PDFium re-renders and rebuilds the pages locally, in the same tab you dropped the file into, and the network panel stays empty the whole time a contract or a folder of scans is shrinking.
Does compression change my original file?
Never. You get a new file with "-compressed" in the name, and the original stays exactly as it was.
Is there a size or page limit?
Files up to 100 MB. Pages process one at a time to keep memory steady, so documents hundreds of pages long are fine on a normal laptop. Figure a second or two per page.

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