How do I compress a PDF online for free?

Open Compress PDF on ToolifHub, upload your file, adjust the compression slider to your preferred quality level, click Compress PDF, review the size savings, then click Download Compressed PDF. The entire process is free with no registration.

Will compressing a PDF reduce text quality?

This tool re-encodes each page as a JPEG image. Text-heavy and vector PDFs may look less sharp, especially at lower quality settings (30–50%). Scanned documents and image-heavy PDFs compress best with minimal visible quality loss. Increase the slider toward 90–95% when readability is critical.

Are my PDF files uploaded to a server?

No. Compress PDF processes everything locally in your browser using JavaScript, PDF.js, and pdf-lib. Your PDF is never sent to ToolifHub servers or third parties, making it safe for confidential documents.

What is the best compression level to use?

For email attachments and web uploads where size matters most, try 50–70%. For documents with important fine text or diagrams, use 80–95%. You can compress, check the savings and visual quality, then adjust the slider and compress again before downloading.

Is there a file size or page limit?

There is no hard limit enforced by ToolifHub, but very large PDFs (hundreds of pages or hundreds of megabytes) take longer to process because each page is rendered in your browser. For best performance, compress on a desktop with adequate RAM.

Why did my PDF get larger after compression?

If your PDF is already optimized (small embedded images, efficient encoding), re-encoding pages as JPEG can sometimes increase size — especially at high quality settings. Try a lower compression level, or use this tool primarily on scanned and image-heavy PDFs where significant savings are typical.

Does Compress PDF work on mobile devices?

Yes. The tool is responsive and works on modern mobile browsers including Safari on iOS and Chrome on Android. Upload, compress, and download work without installing an app, though large files process faster on desktop.

Is Compress PDF really free?

Yes. Compress PDF on ToolifHub is completely free with no hidden fees, watermarks, or usage limits. No account or email address is required — open the page and start compressing immediately.

Compress PDF Online Free - Reduce File Size

Overview

Compress PDF is ToolifHub's free online tool for reducing PDF file size directly in your web browser — no desktop software, cloud upload, or registration required. Whether you need to email a report, submit a résumé to a portal with a 2 MB limit, or speed up a website download, this tool shrinks PDFs by re-encoding each page as a JPEG image at a quality level you control. Upload your file via drag-and-drop or file picker, adjust the compression slider from 30% (smallest file, lower visual quality) to 95% (larger file, higher fidelity), click Compress PDF, and review the before-and-after file size with the percentage saved. When satisfied, download the compressed PDF instantly. The entire workflow runs client-side: PDF.js renders each page to a canvas, the image is compressed as JPEG at your chosen quality, and pdf-lib rebuilds a new PDF document. Your original file never leaves your device, which protects confidential business, legal, and personal documents. ToolifHub does not store, log, or retain uploaded files. For best results, use scanned PDFs, photo inserts, and image-heavy documents. Pure text or vector PDFs may show reduced text sharpness — increase the quality slider if readability is critical. Pair Compress PDF with Organize PDF for page management, PDF to JPG for exporting images, and Protect PDF for encryption when you need a complete document workflow on ToolifHub.

About Compress PDF

Compress PDF is a free, browser-based tool on ToolifHub that reduces PDF file size by re-encoding each page as a JPEG image at your chosen quality level. Upload a PDF, set the compression slider between 30% and 95%, and download a smaller file in seconds — ideal when you need to fit attachments under email limits or meet upload size caps on job portals, government sites, and learning platforms.

All processing happens locally in your browser using PDF.js and pdf-lib. Your document is never uploaded to ToolifHub servers, which makes this tool suitable for contracts, financial statements, medical records, and other sensitive files. There is no account, subscription, or software installation required.

Because compression works by rasterizing pages to JPEG, scanned documents and image-heavy PDFs typically see the largest size reductions. Text-heavy or vector PDFs may lose sharpness at lower quality settings — use a higher compression level when readability matters. After compressing, combine with Organize PDF to merge or split pages, PDF Editor to annotate, or Protect PDF to add a password. Browse all utilities in PDF Tools or read our Privacy Policy for data handling details.

Compress PDF

Overview

About Compress PDF

Key Features

Benefits

How to Use Compress PDF

Use Cases

Email Attachments

Job & University Portals

Scanned Document Archives

Client Deliverables

Website & Intranet Uploads

Mobile Sharing

Frequently Asked Questions

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