Compress PDF.

It rewrites the file's structure and leaves the pages alone. Fonts and images stored more than once are kept once, objects nothing uses are dropped, uncompressed streams are Deflate-compressed, and small objects are packed into compressed object streams. Text, images and metadata don't change.

Every page is drawn as an image at the DPI you pick (72, 100, 150 or 300) and saved as a JPEG at your quality, in color or grayscale. Scans and image-heavy files shrink most. The cost: text becomes pixels that can't be selected or searched, and links and form fields are gone.

A file that's already compact, such as a text document saved by a word processor, has little to remove losslessly. When the result isn't smaller, the tool keeps the original and says so. For scans and photos, try Rasterize at 150 or 100 dpi.

150 dpi at 70% quality, the default, reads well on screen and on a home printer. 100 or 72 dpi suits files only read on screens, and 300 dpi keeps fine print sharp but saves less. Grayscale helps black-and-white documents scanned in color.

No. Compression runs in your browser with pdf-lib and pdf.js, the renderer behind Firefox. The files never leave your device, which matters for contracts, statements and anything else private.

Yes. Drop as many as you like, up to 500 MB each; each row shows its size before and after. They download together as a ZIP, or one at a time from their rows.

No. A file with a password or restrictions is marked protected and left out, since it can't be rewritten here. Save an unprotected copy from a PDF reader first.

Yes. Rasterizing draws one page at a time and the status names the page it's on; Stop ends the job. Changing a setting starts again with the new one, and the last change wins.

No. The "Compress PDF" tool is free and opens without a sign-in, an account or an install.

Nothing. The "Compress PDF" tool holds your input in the page's memory, so closing or reloading the tab clears it, and it saves nothing in this browser.

Files are read into your browser's memory and the "Compress PDF" tool works on them there; nothing is sent to a server.

The "Compress PDF" tool is free and needs no account.

Work in memory means the limit is what your device can hold: up to 500 MB per PDF and 2 GB for a ZIP.

Closest to the "Compress PDF" tool: Merge PDF, Split PDF, PDF to JPG converter, Image compressor. Each opens on its own page, free and in the browser.

The "Compress PDF" tool is one of 15 in its group. The group's page, /tools/file, lists them all.

The tool is free. Its interface is built from shadcn.io's own components (Button, Input, Slider and the rest of the registry under /ui), which come in React, Vue, Svelte and Solid. Pro adds the blocks and templates for the product around it.