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Compress PDF Online Free – Reduce File Size Without Losing Quality

Shrink PDF files by up to 80% with three compression levels - Light, Balanced, or Maximum. No visible quality loss. Free, no signup, no watermarks.

Select a PDF to compress

Drag & drop your PDF file here

PDF files only · Up to 100 MB

How it works

Compress a PDF in 3 simple steps

No software to install. Works on any device with a modern browser - desktop, tablet or mobile.

01

Upload your PDF file

Click "Select PDF file" or drag and drop your PDF onto the page. SupaPDF accepts files up to 100 MB - no account required for basic use.

02

Choose a compression level

Pick Low for maximum quality preservation, Recommended for the best size-to-quality balance, or Extreme for the smallest possible file - ideal for email and messaging.

03

Compress and download

Click "Compress PDF" and your optimized file is ready in seconds. The result screen shows exactly how many bytes were saved before you download.

Why SupaPDF

Everything you need to compress PDFs

Trusted by developers and businesses worldwide to shrink PDF documents reliably and at scale.

Three compression levels

Low preserves near-original quality, Recommended hits the sweet spot, and Extreme squeezes files down to their minimum size for sharing and archiving.

Private & secure

All uploads use encrypted HTTPS. Your files are permanently deleted from our servers immediately after your download is complete.

Before & after comparison

The result screen shows your original file size, the compressed size, and the exact percentage saved - so you always know the impact.

Full developer API

Automate PDF compression in your own apps using our REST API. Specify any compression level in a single API call and receive the result URL.

Developer API

Compress PDFs programmatically

Use our REST API to compress PDFs inside your own application. One credit per job - the lowest cost operation in the SupaPDF API.

curl -X POST https://api.supapdf.com/v1/jobs \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "tag": "compress-pdf-job",
    "tasks": {
      "upload-1": {
        "operation": "import/upload"
      },
      "compress": {
        "operation": "compress_pdf",
        "input": ["upload-1"],
        "compression_level": "recommended"
      },
      "export-result": {
        "operation": "export/url",
        "input": ["compress"]
      }
    }
  }'

Set compression_level to "low", "recommended" (default), or "extreme". After creating the job, PUT your file to the upload_url, then poll GET /v1/jobs/:id?include=tasks until status is "finished". The compressed file URL is in the export-result task.

FAQ

Frequently asked questions

Everything you need to know about compressing PDF files with SupaPDF.

Ready to shrink your PDF?

Free to use · No account required · Instant download