How does Convertiva compress PDFs without uploading them?

The compressor renders each page using browser canvas APIs at an optimized resolution and quality slider setting, compressing embedded images and raster scans locally in memory.

What is the best setting for scanned documents?

Setting the quality to 70–80% typically reduces file size by 60% to 85% while keeping text sharp and legible for screen reading and printing.

Compress PDF

Compress PDF — free, fast and private. Runs entirely in your browser, no upload and no sign-up required.

Drop your files here

Drag & drop files here, or browse files

pdfMaximum file size: 100 MB

Processed in your browser — never uploaded.

Technical Specifications

Input FormatPDF (.pdf)

Output FormatCompressed PDF (.pdf)

Processing Enginepdf.js & Canvas rasterizer

Privacy Protection100% In-Browser · Never uploaded

Shrink large PDFs so they fit e-mail attachment limits and upload caps. Each page is re-rendered as an optimized image at your chosen quality level, which is highly effective for scanned documents.

Get a scanned contract under a 10 MB e-mail limit
Reduce a photo-heavy brochure before uploading
Archive old scans at a fraction of their size

This is a lossy, raster-based compressor: text stays readable but is no longer selectable in the output. For text-born PDFs that are already small, savings will be limited.

How it works

1
Choose or drop your file
2
Adjust options if needed and start processing
3
Download the result — everything stays on your device

Frequently asked questions

How does Convertiva compress PDFs without uploading them?: The compressor renders each page using browser canvas APIs at an optimized resolution and quality slider setting, compressing embedded images and raster scans locally in memory.
What is the best setting for scanned documents?: Setting the quality to 70–80% typically reduces file size by 60% to 85% while keeping text sharp and legible for screen reading and printing.