Compress PDF
Reduce PDF file size online while keeping text sharp. Compress one PDF or a whole batch, then download or deliver the results to Google Drive or Dropbox. Free, with no sign-up or watermark.
Add files to get started
How to compress a PDF
- Add your PDF files. You can compress several PDFs in the same batch.
- Choose a compression level. Recommended suits most documents shared on screen or by email.
- Select Compress PDF, then download each file or the whole batch as a ZIP.
Choose how much to compress
- Recommended: images at 150 dpi, a large size reduction for documents read on screen.
- Strong compression: images at 72 dpi for the smallest PDF, useful for email attachments and upload limits.
- Print quality: images at 300 dpi for documents you still need to print.
- Lossless: images untouched, only fonts and file structure optimized.
Bulk compress PDFs for recurring work
Preparing the same kind of documents every week, such as client reports, invoices, or brochures for a website? Compress the whole batch with one setting so every PDF comes out consistent, then send the results straight to a Google Drive or Dropbox folder instead of downloading and re-uploading them.
Compress scanned PDFs
Scanned pages are stored as images, so they are usually the PDFs that shrink the most. Strong compression and the grayscale option make multi-page scans much lighter. Check small print in the result before you delete the original.
Compress PDF FAQ
How do I reduce PDF file size?
Upload your PDF files, keep the Recommended level or pick another one, and select Compress PDF. Images inside the PDF are resampled to the chosen resolution, fonts are subset, and unused data is removed. Download the smaller PDF when it is ready.
Can I compress a PDF without losing quality?
Yes. The Lossless level keeps every image exactly as it is and only optimizes fonts and the file structure. Savings are smaller, so use Print quality or Recommended when you need a bigger reduction with little visible change.
Can I compress multiple PDF files at once?
Yes. Add several PDFs to one batch and they are compressed with the same settings: up to 5 files on the Free plan, 20 on Basic, and 50 on Pro. Download them one by one or together as a ZIP.
How much smaller will my PDF get?
It depends on the content. Scanned documents and PDFs with large photos often shrink a lot, while text-only PDFs that are already optimized change little. If compression would make a file larger, FastConvert keeps your original instead.
How do I make a PDF small enough to send by email?
Use Recommended or Strong compression. Strong compression resamples images to 72 dpi, which is usually enough to fit email attachment limits while keeping text sharp, because text stays as vector text.
Is there a file size limit?
PDFs can be up to 20 MB on the Free plan, 100 MB on Basic, and 300 MB on Pro.
Can I compress a password-protected PDF?
No. PDFs that need a password to open cannot be compressed. Remove the password in your PDF reader, then upload the file again.
Is it free, and do I need an account?
Compressing PDFs is free without sign-up, and no watermark is added. Files are deleted automatically after 1 day on the Free plan. Paid plans add larger batches, custom compression on Pro, and delivery to Google Drive or Dropbox.