ClariPDF

Optimize PDF

Compress PDF Online

Upload a PDF and choose a compression level. Lower sizes can make files easier to email or submit, but very high compression can reduce image clarity.

InputPDFOutputPDFLimit25 MB per file

No sign-in required for core processing.

Supported formats and limits are shown before upload.

Updated 2026-07-08. Files are handled through temporary processing routes.

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PDF - up to 25 MB

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Status: Waiting for files

  1. Uploading
  2. Processing
  3. Finalizing
  4. Ready

Temporary processing. Download links are not public pages.

Good for

Email attachments
Government or school upload forms
Client review copies
Archiving image-heavy PDFs

How to use this tool

  1. 1

    Upload your PDF.

  2. 2

    Choose low, recommended, or high compression.

  3. 3

    Download the compressed PDF and compare readability.

Before you start

Compression works best on PDFs with removable overhead or optimizable image content. Some already-optimized files may not shrink much.

File handling

  • Compression levels are explained before processing.
  • The tool avoids claims about guaranteed size reduction.
  • You can compare the output before sending it on.

Security & privacy

The API validates PDF signatures, limits size, and returns a temporary downloadable result without creating indexable result pages.

Related tools

Merge PDFCombine multiple PDF files into one document, with file ordering before processing.Split PDFExtract selected pages or plan page ranges from a PDF.PDF to JPGExport PDF pages as JPG images for previews, thumbnails, and image-only upload forms.

Helpful guides

How to compress a PDF for emailPractical steps for reducing a PDF attachment without making it hard to read.How to reduce PDF file size without losing readabilityCompression choices that balance smaller files with readable text and images.Browse all guides

FAQ

Which compression level should I use?

Recommended compression is the safest starting point. High compression is best when size matters more than image detail.

Why did my PDF not get much smaller?

Some PDFs are already optimized or contain images that require a dedicated image recompression engine.

Can compression damage the original file?

The original upload is not modified. Always review the downloaded copy before sending it.