How to Compress a PDF Without Losing Too Much Quality (Free)

Scanned contracts and image-heavy reports can balloon to tens of megabytes — too big to email or upload. This guide shows how to compress a PDF for free in your browser, and how to keep it readable.

Compress a PDF in 3 steps

1. Open the free Compress PDF tool.
2. Upload the PDF you want to shrink.
3. Pick a quality level, click Compress, and download the smaller file.

Everything runs on your device, so the document never leaves your browser.

How it works (and when it works best)

The Compress PDF tool rasterizes each page — it re-renders pages as compressed images and rebuilds the PDF around them. That makes it especially effective for scanned documents and image-heavy PDFs, where most of the file size is pictures rather than text.

Because pages become images, very text-heavy PDFs may not shrink as much, and the text is no longer selectable in the output. If you need selectable text, keep the original and use the compressed copy only for sharing.

Choosing a quality level

• High quality keeps pages crisp; best when the PDF will be printed or read closely.
• Medium is the usual sweet spot — much smaller files that still read cleanly on screen.
• Low produces the smallest file; fine for quick previews or hitting a strict size limit.

Tips for a good result:

• If a PDF is still too large, drop one quality level and re-run it.
• Remove pages you don't need first with PDF Split, then compress.
• Merging several compressed PDFs? Combine them afterward with PDF Merge.
• Need individual page images instead? Use PDF to JPG.

Privacy note

The Compress PDF tool processes your file entirely in the browser — nothing is uploaded to a server, which matters for contracts, IDs, and financial documents.

Frequently asked questions

Why didn't my PDF get much smaller? Text-only PDFs are already compact; compression helps most with scans and images.

Are my files uploaded? No. Compression happens entirely in your browser.

Troubleshooting

• The text is now blurry or unselectable. Because pages are rasterized to images, fine text softens at lower quality and can no longer be selected or searched. Bump the quality level up one step, or keep the original for reading and use the compressed copy only for sending.
• The file barely shrank. A PDF that's mostly real text is already compact, so there's little to squeeze; the big wins come from scans and photos. If a single huge image is the culprit, splitting it out with PDF Split before compressing can help.
• The PDF got larger. This happens when a text-based PDF is rasterized into images — the images weigh more than the original text. In that case the file didn't need compressing; keep the original.
• A 100+ MB file freezes the tab. Browser memory is the limit. Split the document first, compress the parts, then recombine with PDF Merge.