PDF-Kompressor

PDF-Dateigröße mit adaptiver DPI-Skalierung reduzieren.

📄 PDF hier ablegen oder klicken zum Durchsuchen PDF · bis 200 MB

What is this PDF compressor?

This free PDF compressor reduces PDF file size by re-encoding images with adaptive DPI scaling, working entirely in your browser so your documents are never uploaded to a server.

How can I make a PDF smaller without uploading it online?

Drop your PDF in, pick Balanced or Maximum compression, and click Compress. The tool re-encodes images at a lower DPI in your browser and lets you download a smaller file — with no upload.

Key features

Adaptive DPI scaling
Re-samples embedded images to a sensible resolution to cut size while keeping pages readable.
Two modes
Balanced keeps quality high; Maximum squeezes the smallest possible file for strict email limits.
Before / after sizes
Shows original versus compressed size and the exact percentage saved.
Fully offline
Compression runs on your device, so contracts, invoices and reports stay confidential.

How to use it

Drag your PDF onto the drop zone. Choose Balanced quality for everyday sharing, or Maximum compression to hit strict size limits. Click Compress PDF, review the size reduction, and download the result. The original file never leaves your computer.

Frequently asked questions

Is my PDF uploaded to a server?

No. Compression happens entirely in your browser, so sensitive documents are never transmitted or stored anywhere.

Why didn't a text-only PDF shrink much?

Compression mainly re-encodes images. A PDF that is mostly text is already small, so there is little to remove.

Will compression ruin the quality?

Balanced mode preserves readable text and images; Maximum trades some image sharpness for the smallest file.

Toolbox builds this on the open-source pdf-lib and PDF.js libraries used across the industry, applying conservative DPI targets so compressed files stay legible for email, printing and archiving.