Quick Answer
A PDF compressor makes a PDF file smaller. This tool offers two honest modes: Lossless, which keeps the document exactly as it is (text stays selectable and searchable), and Visual, which re-encodes every page as a compressed image for the biggest reduction — at the cost of making text part of the picture. You choose, and the result panel shows the true before/after sizes.
What This Tool Does
Add a PDF and pick a mode. Lossless re-serializes the document with compressed object streams — text, vectors, forms and images are untouched, so nothing visible changes. Visual renders each page and re-encodes it as a compressed JPEG, then rebuilds the PDF; this is where image-heavy files lose the most weight. In Visual mode you also pick a quality level (High, Standard or Low) that trades sharpness for size. The result panel reports the original size, the new size, the percentage change, and the mode used.
The Two Modes, Explained Honestly
Lossless — keep quality and selectable text. The document is rewritten with compressed object streams and redundant data cleaned. Text stays selectable and searchable, layout is identical, and forms keep working. Gains depend on the source file: PDFs exported or edited many times shrink the most; files already saved efficiently may barely change. If the reduction is small, that is the truth of the file — not a bug.
Visual — maximum reduction. Every page becomes a compressed image. This is the mode that turns a 50 MB photo album into a 3 MB file. The honest trade-off: text becomes part of the picture, so it is no longer selectable or searchable, and zoomed-in pages can look softer. Visual mode can make a mostly-text PDF larger, not smaller — the tool detects this and tells you to switch to Lossless instead.
Key Features
- Two honest modes — Lossless (keep quality) and Visual (maximum reduction), each with its trade-offs spelled out.
- Three visual quality levels — High (150 DPI, 85%), Standard (110 DPI, 70%) and Low (80 DPI, 50%).
- Real results — the panel shows original size, new size, percentage change and the mode used.
- An honest warning — if Visual mode makes the file bigger, the tool says so and points you to Lossless.
- Per-page progress — Visual mode shows "Compressing page 3 of 12" as it works.
- Local processing — everything runs in your browser; nothing is uploaded.
How to Use the Compress PDF Tool
- Add your PDF.
- Choose Lossless to keep text selectable, or Visual for the biggest reduction.
- If you chose Visual, pick a quality level (High, Standard or Low).
- Click Compress PDF and wait for the progress indicator.
- Check the before/after numbers and download your file.
Examples
A 40 MB photo book from a printing service: Visual mode at Standard brings it down to about 6 MB — small enough to email, with pages that still look crisp on screen. A 2 MB contract exported from Word: Lossless mode keeps every word selectable so a reviewer can still search the text, and the file may drop a little or stay the same — either way, nothing was lost.
Use Cases
- Email limits — shrink scans and photo PDFs below the 10–25 MB attachment limits.
- Uploads — fit documents into forms and portals that reject large files.
- Storage — archive image-heavy documents without eating your drive or cloud quota.
- Faster sharing — smaller files upload and download noticeably faster.
Tips
- Mostly text? Use Lossless. Mostly photos or scans? Use Visual.
- If you need the text to stay searchable, never use Visual mode on a text document — the text layer is lost.
- Start with Standard quality; drop to Low only if you need the file smaller and sharpness is not critical.
- For a password-protected file, remove the password first with the Unlock PDF tool, then compress the unlocked copy.
Privacy
Compression is computed locally with pdf-lib and pdf.js. Your document never leaves your device.
Conclusion
Compression with no fine print: pick the mode that matches your document, see the real numbers, and download. Free and private.