Compress PDF
Shrink photos and scans
Shrink a PDF by recompressing the images inside it. Text and vector graphics are left untouched, so the document stays sharp where it matters.
Questions
- Are my files uploaded anywhere?
- No. Every tool on this site runs entirely inside your browser using JavaScript — your file is never uploaded to a server, because there is no server. You can confirm it by opening your browser’s network tab, or by disconnecting from the internet once the page has loaded: the tool still works.
- Why did my PDF barely get smaller?
- Because there was little to compress. Only photos and scanned pages can be recompressed — a PDF that is mostly text is already about as small as it can get, since its text is stored as instructions rather than pixels.
- Will it make my document blurry?
- Text and vector graphics are never touched, so they stay perfectly sharp. Photos are re-encoded at the quality level you pick, so “Smallest file” trades visible detail for size while “Best quality” is close to indistinguishable.
- Which images are left alone?
- Images with a transparency mask are skipped. Recompressing one without resizing its mask to match would leave the two mismatched and show as artefacts around the edges.
- Can I undo it?
- Not from the compressed file — the image data really is re-encoded. Your original stays untouched on your device, so keep it if you may need the full-quality version.