Private browser PDF editing

Compress PDF files online for free.

Choose Light, Balanced, or Strong compression and download a smaller visible-page copy created privately in your browser.

How to compress a PDF online

1. Choose a PDF from your device.
2. Review the original file size and page previews.
3. Select Light, Balanced, or Strong compression.
4. Download the smaller PDF created in your browser.

Private local PDF compression

PDFMech renders, rebuilds, validates, and downloads the compressed copy in your browser without uploading the source document.

Best for scanned and image-heavy PDFs

Raster compression is most effective for scans, photographs, screenshots, and presentation graphics. Already-efficient text PDFs may not become smaller.

Raster compression limits

The visible pages remain, but selectable text, forms, links, layers, attachments, and digital signatures do not remain interactive in the compressed copy.

Compress PDF files online for free FAQ

Does PDFMech upload my PDF?

No. Previewing, compression, validation, and download happen locally in your browser.

Which compression level should I choose?

Balanced is recommended for most sharing and email tasks. Choose Light for sharper detail or Strong for a smaller file.

Why did my PDF not become smaller?

Text-only and already-optimized PDFs can be more efficient than rasterized pages. PDFMech keeps the original bytes when the generated copy would be larger.

Will text remain selectable?

No. This compressor rebuilds visible pages as images. Keep the original when selectable text, links, forms, or accessibility structure must remain available.