Compress PDF
Your file stays on your device — nothing is uploaded.
How it works
Compress PDF makes a heavy document light enough to email or upload. Each page is re-rendered and its images are re-encoded at a lower resolution and quality, then a new, smaller PDF is built — which is why scanned documents and photo-heavy pages shrink dramatically, while files that are mostly text or vector graphics are already compact and gain little. One trade-off worth knowing: because pages become images, text may no longer be selectable or searchable afterwards, especially at the Strong level. If a file would not get meaningfully smaller, your original is kept untouched so it never comes back larger. Compression runs entirely in your browser and the file is never uploaded.
- Drop a PDF onto the page. A password-protected file has to be unlocked first — the Unlock PDF tool does that in one step.
- Choose a level: “Light” for the best quality and modest savings, “Recommended” for a balance that suits most documents, “Strong” for the smallest file when size matters more than fidelity.
- Press “Compress PDF” and let it work through the document.
- Check the result line — it shows the original and new size plus the percentage saved. If the PDF was already optimised, you will be told so and the original is returned.
- Download the compressed file. To try another level, press “Compress another PDF” and add the file again.