Is my PDF uploaded to compress it?

No. Compression runs entirely in your browser — your file never leaves your device. That's the difference from Smallpdf and iLovePDF, which upload your document to their servers.

How much smaller will my PDF get?

It depends on the document. Text-heavy PDFs shrink modestly in lossless mode; scans and image-heavy PDFs shrink a lot when you re-render pages to images. If compression can't beat the original, AttachKit returns the original so you never download a larger file.

Will compressing lose quality or text?

Lossless mode keeps your text selectable and only re-optimises. The image mode rasterises pages for bigger savings, so text becomes part of the image — afterwards you can run OCR to make it searchable again.

Yes — unlimited, no account, no watermark.

Compress a PDF

Shrink a PDF that's too big to email or upload. It all happens in your browser — unlike most online compressors, your file is never uploaded to a server.

100% local. The PDF never leaves this device — open DevTools and watch.
Two modes. Keep text selectable, or flatten to images for the biggest savings.

Drop a PDF here

or tap to choose a file

Compression that never leaves your browser

Shrink a PDF's file size right in your browser — the file is never sent to a server, unlike Smallpdf or iLovePDF.

Nothing is uploaded

The whole thing runs in your browser — open your network tab and watch: your file never leaves your device. Most online tools round-trip your document through their servers.

Two ways to shrink

Keep text selectable for a lossless trim, or re-render pages as images for the biggest savings on scans. AttachKit never hands you a bigger file — if it can't beat the original, it keeps it.

Free, no account

No watermark, no sign-up, no size cap beyond what your browser can hold. Download the smaller PDF and you're done.