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PDF Compress

Reduce PDF file size without losing quality — perfect for email attachments and web uploads.

Free3 LevelsFast

Drop PDF to Compress

Reduce PDF file size for email and web

How it works

A compact workflow from input to download.

1

Upload PDF

Select or drag your PDF file. Supports documents of any size with embedded images.

2

Choose Compression Level

Pick Low, Medium, or High compression. Higher levels reduce size more but may affect image quality.

3

Download Compressed PDF

Get your smaller PDF instantly. Compare file sizes before and after compression.

Frequently asked questions

How much can a PDF be compressed?
Typically 40-80% reduction depending on the content. PDFs with many images compress the most, while text-heavy documents may see smaller reductions.
Does compression affect text quality?
No. Text, vector graphics, and fonts remain pixel-perfect. Only embedded raster images are optimized during compression.
What compression levels are available?
Three levels: Low (best quality, moderate reduction), Medium (balanced), and High (maximum reduction, some visible image quality loss).
Can I compress a PDF for email attachment?
Yes. Most email providers limit attachments to 25MB. Use Medium or High compression to bring large PDFs under the limit while preserving readability.
Is my PDF uploaded to a server?
No. Compression runs entirely in your browser using JavaScript. Your document never leaves your device, ensuring complete privacy.

Why PDFs Become Too Large

PDF files often balloon in size because they contain unoptimized, high-resolution images or embedded fonts. When you scan a document, the scanner typically saves each page as a massive high-DPI image wrapped in a PDF container. A 10-page scanned contract can easily exceed 20MB, making it impossible to attach to standard emails or upload to web portals with strict file size limits.

How PDF Compression Works

Our PDF compressor works primarily by targeting the embedded images within the document. It downsamples (resizes) images to a web-friendly resolution (typically 144 or 72 DPI) and applies JPEG compression to reduce the byte size of the image data. Crucially, the actual text and vector elements in the PDF remain sharp and untouched, ensuring the document remains perfectly legible while dramatically reducing the overall file size.

Related tools

Continue the workflow with adjacent tools.

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