Compress PDF Tool — Reduce PDF File Size

Compress PDF — Reduce File Size

Reduce the size of one or more PDF files while keeping acceptable visual quality. Files are processed in your browser for privacy and speed.

Drag & drop PDF files here or click "Add PDFs" to select. You can compress multiple files in sequence. Files remain in your browser and are not uploaded to a server.
Supported: PDF files. Large files may take longer to process depending on browser memory.

About this tool

This Compress PDF Tool helps you reduce the file size of PDF documents in the browser. It is intended for users who need smaller files for email, uploads, or storage. The tool performs compression locally using client-side processing, preserving privacy and avoiding uploads to external servers.

How it works — step by step

  1. Click "Add PDFs" or drag & drop files into the upload area. The tool accepts multiple PDF files.
  2. Choose your compression preference (High, Medium, Low) and whether to remove images entirely.
  3. Click "Compress PDFs". Each file will be processed in your browser and a compressed version will be generated.
  4. Download the compressed PDF file. If multiple files are compressed, download links will be provided for each.

Compression details

  • High quality — preserves image quality, modest size reduction.
  • Medium quality — balance between image clarity and size reduction.
  • Low quality — aggressive compression that yields the smallest files, may reduce image clarity.
  • Remove images — strips embedded images, keeping only text and vector content (significant size reduction but may lose visual data).
Privacy & Security: All compression is performed locally in your browser. Files are not transmitted to remote servers. Always use a trusted device for sensitive documents.

Benefits

  • No registration or uploads required — private and quick.
  • Multiple compression profiles to suit your needs.
  • Works on modern desktop and mobile browsers.
  • Simple interface for fast results.

Frequently Asked Questions (FAQ)

Will compression affect text quality or readability?

Text (vector) content generally remains sharp. Compression mainly targets images embedded in the PDF. Choosing "High quality" preserves readability while giving moderate size reduction.

Is my file uploaded to a server?

No. This implementation uses client-side processing: files remain in your browser and are not uploaded. If you adapt this code to a server-side compressor, confirm the privacy policy with users.

What are the limits on file size and number of files?

Limits depend on your device and browser memory. Very large PDFs may be slow or fail due to memory constraints. Compress files one at a time if you encounter issues.

Which browsers are supported?

Modern browsers (Chrome, Edge, Firefox, Safari) that support the File API and WebAssembly are recommended. Keep your browser updated for best performance.

Is this tool free to use?

This example runs entirely in the browser and is free to use. If you integrate it into a production site, you can add monetization and terms of service as needed.