Compress PDF Files Online — Reduce Size Instantly

Shrink your PDF file size without losing quality. Our PDF compressor removes unused objects and rebuilds internal structures to deliver smaller files that are easy to share via email, upload to websites, or store in the cloud.

Why use this page?

  • Choose lighter or stronger compression based on the destination
  • Text and vector graphics remain pixel-perfect
  • Batch compress multiple PDFs at once
  • Ideal for email attachments and web uploads
  • See the output size before deciding whether to keep the result

When this tool is the right choice

  • Bring an attachment under an email provider's size limit.
  • Meet a 1MB, 5MB, or 10MB upload cap on a job, school, tax, or government portal.
  • Reduce storage and transfer time for image-heavy reports or scanned records.
  • Prepare a smaller web copy while keeping the original print-quality PDF.

What to expect

  • Compression results depend on the source: image-heavy scans usually shrink more than text-only PDFs.
  • Stronger modes may soften photographs; text and vector artwork generally remain sharper.
  • An already optimized or digitally generated PDF may only become slightly smaller.

File handling: PDFAway may use a temporary compression service for some files or settings. Transfers use HTTPS and files are processed for the requested job rather than kept as document storage.

How it works

  1. Upload one or more PDF files using the file picker or drag-and-drop.
  2. Review the file list and adjust compression settings if needed.
  3. Click "Process" to compress. A progress bar shows real-time status.
  4. Download individual files or grab everything as a single ZIP.

Frequently asked questions

Does compressing a PDF reduce quality?

Our compression focuses on structural optimization — removing duplicate objects, rebuilding cross-references, and stripping metadata. Text and vector graphics remain untouched, so visual quality stays the same.

Is there a file size limit?

You can upload PDFs up to 200 MB each. Files over 50 MB will trigger a large-file notice and may take a bit longer to process.

Can I compress multiple PDFs at once?

Yes. Select multiple files during upload and they will all be compressed in a single batch operation with per-file progress tracking.

How much can I reduce the file size?

Results vary by file. PDFs with embedded fonts and duplicate objects can often be reduced by 40–90%. Already-optimized files may see smaller reductions.

Why did my PDF barely get smaller?

Text-only PDFs are already very compact, so there is little redundant data to remove. The biggest reductions come from files with large embedded images, scanned pages, or unused fonts.

Is my PDF uploaded to a server?

Some compression paths can use a temporary processing service to achieve a smaller result. Use the file-handling note on this page when deciding whether the tool is appropriate for highly sensitive material.