Compress PDF files
Compress PDFs with lossless optimization or explicit image quality settings. Batch files and compare savings.
How to use Compress PDF
- 1Add one or more PDFs
- 2Pick a compression level
- 3Download the smaller files
What makes it better
- Extreme, recommended and high-quality presets, plus a custom image DPI
- Optional greyscale for the smallest scanned documents
- Never makes a file bigger — the original is kept if it is already optimal
- Batch compress with per-file savings and one ZIP
Good to know
- The engine (Ghostscript, about 16 MB) downloads once on first use and is then cached by your browser.
- Ghostscript is licensed under the GNU AGPL v3; its unmodified source is available at github.com/jsscheller/ghostscript-wasm.
- Text-only PDFs are usually already small; the biggest savings come from scans and photos.
Compress PDF FAQ
Will my original PDF be changed?
No. Your original file stays unchanged. Download the result as a separate file.
Which compression level should I choose?
“Recommended” (150 dpi images) suits screens, email and most portals. “Extreme” (72 dpi) gives the smallest file for previews. “High quality” (300 dpi) is for printing.
Will compression make text blurry?
No. Text and vector graphics stay sharp; only embedded images are resampled and re-encoded.
Is there a file size or daily limit?
No daily limit, no signup and no watermark. Files can be up to 200 MB each; very large documents depend on your device’s memory.
How do I compress a PDF to under 100 KB or 200 KB for a government portal?
Choose “Extreme”, or “Custom” with 72–100 dpi and greyscale, then check the size shown for each file. Scanned forms usually drop below 200 KB; if a file is still too large, split it or remove pages you don’t need first.