Kroma.

Compress PDF

Reduce file size for easier sharing.

Files stay on your device
Drag your files here

PDF · Up to 20 MB per file

    File limits & details

    Low performs lossless structure and stream optimization. Medium and High may convert eligible images to JPEG at 85% or 65% quality. Text remains text; pages are not rasterized. Existing JPEG images may not shrink. If no smaller output is produced, the original is offered unchanged. Compression can preserve active content from the original PDF.

    PDF · One file · 20 MB · 200 pages

    Help & details

    How to use this tool

    1. Add files using Browse files or drag and drop. Review the displayed limits.
    2. Arrange files, choose settings and review the processing notes.
    3. Process locally. Wait for the result, then download it. Your originals are not overwritten.
    4. Clear the workspace to release files, previews and download links.

    Questions and limitations

    Are documents uploaded?

    No. Files are read and processed locally in your browser. Processing libraries and fonts are served by this website; document bytes are not sent to a server.

    Are encrypted or signed files supported?

    Password-protected PDFs are rejected. Transformations invalidate digital signatures. Merge rejects interactive forms rather than producing broken form fields.

    What are the technical limits?

    20 MB per file, 60 MB total; up to 10 PDFs or 20 images. PDFs are limited to 200 pages, or 100 for Word conversion. Images are limited to 16 megapixels and 8192 pixels per edge. A local job times out after two minutes. Hard browser memory quotas are not available.