PDF Compressor
Compress PDF files to reduce their size — files are encrypted in transit, processed securely, and deleted immediately.
What Is PDF Compression?
PDF compression reduces the file size of a PDF document by downsampling images, removing redundant data, and optimizing the internal structure. The goal is to make the file smaller while keeping the content readable and visually acceptable. A well-compressed PDF can be a fraction of the original size without obvious quality loss.
Why Compress PDFs?
Large PDFs are a problem. They're slow to upload, hard to email (most services cap attachments at 10-25MB), and take up unnecessary storage space. Scanned documents, image-heavy reports, and exported presentations often produce PDFs that are far larger than they need to be. Compression brings them down to a practical size.
When Does Compression Help Most?
The biggest gains come from PDFs that contain high-resolution images — scanned pages, photo-heavy brochures, and exported presentations with embedded graphics. Text-only PDFs are already small and won't shrink much further. If your PDF is mostly text, compression may reduce the file size by only a few percent.
How This Tool Works
Upload your PDF and choose a compression level — from maximum compression for email-friendly files to minimal compression for print-quality documents. Your file is encrypted during transfer, processed on our server using Ghostscript, and deleted immediately after — we never store your files.
Compression Levels — When to Use Each
| Level | Image DPI | Best For | Typical Reduction |
|---|---|---|---|
| Maximum (Screen) | 72 dpi | Email, web viewing, quick sharing | 60-90% smaller |
| Balanced (Ebook) | 150 dpi | General sharing, digital reading | 40-70% smaller |
| Moderate (Printer) | 300 dpi | Office printing, reports | 20-40% smaller |
| Minimal (Prepress) | 300 dpi | Professional printing, high quality | 10-20% smaller |
Use Maximum Compression When
You need the smallest possible file and image quality isn't critical. Scanned documents being emailed, forms for online submission, and reference copies that just need to be readable. Text remains sharp at any compression level — only images are affected.
Use Balanced or Moderate Compression When
You want a good balance between file size and visual quality. Balanced works well for documents shared digitally — reports, presentations, and proposals. Moderate is the right choice when the document might be printed on a standard office printer.
Common Scenarios for PDF Compression
Emailing Large Attachments
Most email services limit attachments to 10-25MB. If your PDF exceeds that limit, compression can bring it below the threshold without needing to use a file-sharing service. Choose maximum or balanced compression for the best size reduction.
Uploading to Web Portals
Job application portals, government submission systems, and university upload forms often have strict file size limits. Compressing your PDF ensures it meets the requirement while preserving all the content.
Reducing Storage Usage
Archives of scanned documents, photo collections exported as PDFs, and accumulated reports can consume significant storage space. Batch-compressing these files reclaims disk space without losing the content you need.
Speeding Up Document Loading
Large PDFs load slowly, especially on mobile devices or slow connections. Compressed files open faster, scroll more smoothly, and provide a better reading experience for anyone viewing the document.
Sharing Scanned Documents
Scanned PDFs are often 5-20x larger than they need to be because scanners default to high-resolution settings. Compressing a scanned document typically achieves 60-80% size reduction with no visible loss in text readability.
Frequently Asked Questions
Is it safe to compress my PDF here?
Yes. Your file is encrypted during upload, processed on our server, and deleted immediately after the compression completes. We never store, log, or read the content of your documents. No account is required and no conversion history is kept.
Will compression affect text quality?
No. Text in a PDF remains sharp regardless of the compression level you choose. Compression primarily affects embedded images by reducing their resolution. Choose a higher quality setting if your document contains important photographs or detailed graphics.
How much smaller will my file be?
It depends on the content. Image-heavy PDFs (scanned documents, photo albums, presentations with graphics) can shrink by 60-90% at maximum compression. Text-heavy PDFs with few images may only shrink by 5-15% since the text is already compact.
Is there a file size limit?
Yes, the maximum file size is 25MB. If your PDF exceeds this limit, it may already be a candidate for compression — try splitting it into smaller parts using the PDF Split tool, compressing each part separately, then merging the results.
Can I compress multiple PDFs at once?
Currently, this tool compresses one file at a time. Upload your PDF, download the compressed result, then start another compression for the next file.