Free PDF Compressor
Compress PDF Online
Shrink PDF files online with quality-preserving presets. Pick the preset that matches how the PDF will be used, and let Convertr handle the rest.
Quality Presets
Prepress · Printer · Ebook · Screen · Lossless
Email-friendly PDFs
Shrink invoices, reports, and contracts so they fit inside common email attachment limits without splitting them across multiple messages.
Faster web downloads
Compress brochures, whitepapers, and product sheets before publishing them so visitors do not wait on slow downloads.
Long-term archives
Use Lossless or Ebook to reduce storage footprint when you are keeping a PDF copy of finished documents.
Online PDF compressor
How to compress a PDF online
Use this page when you need to shrink a PDF without installing Acrobat or a desktop compressor. Convertr keeps the workflow simple: upload the PDF, pick the preset that fits the use case, and download a smaller file.
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Upload your PDF file from your computer, phone, or tablet.
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Choose a quality preset that matches how you will use the PDF.
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Start the compression and wait while Convertr produces a smaller PDF.
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Download the compressed PDF and share, print, or archive it.
What each preset does
Convertr exposes the underlying Ghostscript and qpdf options as plain-language presets. Quality and final size are entirely your choice; no preset is forced.
Prepress (maximum quality)
Highest quality for professional printing. Keeps embedded fonts and images at 300 DPI. Smallest size reduction; best fidelity.
Printer (high quality)
High quality for desktop printing. Images downsampled to 300 DPI. Modest size reduction with strong fidelity.
Ebook (balanced)
Balanced size and quality for screen reading. Images downsampled to 150 DPI. Good for email and web sharing.
Screen (smallest)
Smallest output for low-resolution screen viewing. Images downsampled to 72 DPI. Use only when size matters most.
Lossless (qpdf restructure)
Re-linearises and recompresses object streams with qpdf. No image downsampling or quality change. Best for already-optimised PDFs.
More document tools
Related PDF and document tools
Need to change format, not just size? Try these other free Convertr tools.
PDF Converter
Convert PDF files to and from DOCX, JPG, PNG, and other document formats.
DOCX to PDF Converter
Turn Word documents into PDF files that keep their layout when shared or printed.
PDF to JPG Converter
Export PDF pages as JPG images for previews, thumbnails, or web uploads.
Document Converter
Convert PDF, DOCX, EPUB, and other document formats from one hub.
Frequently asked questions
Is this PDF compressor free?
Yes. Convertr lets you compress PDF files for free, with no account, no watermark, and no software installation.
Will my PDF lose quality after compression?
You choose the preset, so you choose the quality. Prepress and Printer keep images at 300 DPI, Ebook downsamples to 150 DPI for screen reading, Screen targets 72 DPI for the smallest file, and Lossless re-saves the PDF without touching image quality.
What is the maximum PDF file size?
You can upload PDF files up to 1 GB, the same limit as every other Convertr tool.
Are uploaded PDFs private?
Files are processed on Convertr servers and automatically deleted after compression. The tool is built for quick file conversion, not long-term document storage.
Which preset should I pick?
Pick Prepress or Printer for documents going to print, Ebook for email or web sharing, Screen when you need the absolute smallest size, and Lossless when the PDF is already optimised and you only want to recompress the structure.
Does Convertr support password-protected PDFs?
Remove the password from your PDF before uploading. Convertr does not unlock encrypted PDFs and the compressor will skip files it cannot read.