A PDF that's too big to email or upload is one of the most common document headaches. The good news: most large PDFs are large for one reason — high-resolution images and scanned pages stored at full quality. Compressing the PDF re-encodes those images to a sensible size, often cutting the file by 60–90% while keeping text sharp and pages perfectly readable.
Compress your PDF now
Drop your file in and download a smaller version. It's processed locally in your browser — nothing is uploaded.
Open the PDF compressor →Step-by-step: shrink a PDF in seconds
- Open the PDF compress tool.
- Drag and drop your PDF, or tap to browse for it.
- Pick a compression level — balanced is best for most documents.
- Let it process and preview the new file size.
- Download the compressed PDF. That's it.
What actually makes a PDF smaller
- Downsampling images. Full-camera-resolution photos are overkill for a document; lowering DPI is where most of the savings come from.
- Re-encoding scans. Scanned pages saved as lossless images balloon in size — smart re-compression fixes this.
- Removing bloat. Embedded thumbnails and duplicate resources add weight you don't need.
Tips to hit a specific target size
- Start balanced, then go harder. Only push to high compression if you still need to lose more.
- Merge first if you're combining files. Use our PDF merge tool, then compress the combined document once.
- Scanned text? If you also need to search or copy the text, run OCR before or after compressing.
- Keep the original. Always save a copy before compressing, in case you need the full-quality version later.
Frequently Asked Questions
Why is my PDF so large in the first place? ▼
The most common cause is high-resolution images or scanned pages embedded at full quality. Fonts, embedded thumbnails, and duplicated resources add to it too. Compression re-encodes the images at a sensible resolution, which usually accounts for the biggest savings.
Will compressing a PDF ruin the quality? ▼
Not for normal use. A balanced compression keeps text crisp and images perfectly readable on screen and in print. Only extreme settings on image-heavy files produce visible softening — and you control how far to push it.
What size do I need for email attachments? ▼
Most email providers cap attachments around 20–25 MB, but many portals ask for under 5 MB or even 2 MB. Compressing a scanned document often takes it from 15–30 MB down to 1–3 MB, comfortably under those limits.
Is it safe to compress a confidential PDF? ▼
Yes — our compressor runs entirely in your browser, so the file is never uploaded to a server. That makes it safe for contracts, tax forms, and other sensitive documents.