PDF Compressor

Reduce image-heavy PDF size locally with quality profiles.

Upload PDF

Your file never leaves your device · No signup · No daily limit

Up to 48 MB per file

Safe local compression

The file stays on your device. Every page is checked first, work is limited to a safe share of device memory, and the finished PDF is reopened before download.

Upload a PDF to check it and see a verified size report here.

How it works

Drop a PDF. The tool inspects the whole document locally and starts with Smart (recommended).
The whole document is kept automatically. Smart preserves page order, text, links, form fields and vector artwork while recompressing supported images.
Smallest file appears only after the full inspection confirms a pure image scan with no text or interactive document features to preserve.
Compress, review the page count and before/after sizes, then download the result. If no smaller usable result is made, the original remains available.

What people use it for

Shrinking a bulky scanned document to fit an email attachment limit.
Reducing an image-heavy brochure or portfolio for faster sharing.
Getting a large PDF under an upload size cap.

Good to know

Scanned and photo-heavy PDFs usually shrink the most. An already-optimized or mostly vector PDF may not shrink; in that case the original remains the safer result.
Smart is the document-safe mode: it preserves selectable text, links, form fields and vector artwork. Smallest file rasterizes pages and is therefore enabled only for a fully inspected image-only scan.
Password-protected PDFs are rejected; unlock them first. Do not compress a digitally signed PDF because changing its bytes can invalidate the certificate signature. Keep the signed original.
The input limit is calculated from device memory. A device in the 6 GiB class typically receives a limit around 48 MiB; smaller devices receive a lower limit to avoid exhausting browser memory.

Frequently asked questions

Why did my PDF barely shrink?

It may already be optimized or contain mostly text and vector artwork. Smart protects that content instead of turning it into pixels, so a small or zero reduction can be the correct result.

Will text, links and forms still work?

Yes in Smart, which keeps text, links, form fields and vector artwork intact. Smallest file is shown only when the complete document scan finds none of those features.

Is the PDF uploaded to compress it?

No. Processing stays in your browser and the file is not sent to a server. Keep the connection available until the page and required local engines have loaded; the upload limit is adjusted to your device's memory.

Common tasks

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