Text stays selectable
Images and data are compressed, but the text layer is kept, so search and copy still work.
Free Compress PDF
Compress PDF — Reduce File Size
Shrink PDFs for email and uploads while keeping text sharp and selectable.
Open Compress PDF
Free · No watermark · Your file never leaves your device
What is Compress PDF?
Compressing a PDF reduces its file size so it is easier to email, upload or store. SuperPrompts' free Compress PDF tool shrinks files by re-encoding large embedded photos at a sensible resolution, re-compressing internal data streams, and tidying redundant vector data, while leaving the text layer untouched, so the compressed PDF stays searchable and copyable. You can choose Light for best quality, Balanced for most documents, or Strong for the smallest file. Compression runs entirely in your browser, so the file never leaves your device. The result is never larger than the original: if a PDF is already optimized, you simply get it back unchanged. Typical savings are 10–40% for text documents and much more for photo-heavy files.
How to use Compress PDF
- 1Open the PDF you want to shrink.
- 2Choose Light, Balanced or Strong compression.
- 3Click Compress and compare the before and after sizes.
- 4Download the smaller PDF.
Why use SuperPrompts Compress PDF?
Private by design
Compression happens in your browser; your PDF is never uploaded.
Never bigger
If a file can't be made smaller, you get the original back instead of a larger copy.
Frequently asked questions
How do I reduce the size of a PDF?
Open it in Compress PDF, choose a compression level and click Compress. The tool shows the new size before you download.
Does compressing a PDF reduce quality?
Light and Balanced keep text and layout identical and only re-encode large images. Strong saves the most space and may soften photos.
Is my PDF uploaded to a server?
No. Compress PDF runs entirely in your browser, so the file stays on your device.
Why didn't my PDF get much smaller?
Text-only PDFs that are already optimized have little to remove. Photo-heavy PDFs and scans usually shrink the most.
Related free tools
Merge PDF
Combine several PDFs into one document, in exactly the order you want. No watermark, no page limits.
Split PDF
Pull out the pages you need, split by custom ranges, or cap each part to a file size limit.
PDF to JPG
Save each PDF page as a sharp JPG image, ready to share or post.
OCR PDF
Recognize the text in scanned pages so you can search, select and copy it.
Ready to compress pdf?
One of 30+ free PDF tools on SuperPrompts.
Open Compress PDF