How to use Compress PDF
- Add or paste your input above.
- Click the action button to run Compress PDF.
- Copy or download your result.
About compressing PDF files
Compressing a PDF reduces its file size so it is easier to email, upload or store. This is especially useful for scanned documents and image-heavy files that exceed attachment limits. The tool optimises the PDF in your browser without sending it anywhere.
Tips
- Image-heavy and scanned PDFs shrink the most.
- Keep your original if you need the maximum possible quality.
- Compression runs locally, so even sensitive files stay private.
Compress PDF — frequently asked questions
- How much smaller will my PDF be?
- It depends on the content. Scanned and image-rich PDFs often shrink dramatically, while text-only PDFs are already small and compress less.
- Does compressing a PDF lower its quality?
- Compression mainly optimises images inside the PDF. Text stays crisp, and the visual difference is usually minimal at normal settings.
- Is Compress PDF free to use?
- Yes. Compress PDF is completely free with no sign-up, no watermarks and no usage limits.
- Is my data uploaded to a server?
- No. Compress PDF runs entirely in your browser, so your data never leaves your device.
- Is there a size limit?
- Only your device's available memory — there are no server-side limits because nothing is uploaded.