PDF Compressor

What does this tool do?

PDF Compressor reduces the file size of any PDF document by re-encoding its pages as optimized JPEG images. The compression runs entirely in your browser using pdf.js to render pages and pdf-lib to reassemble the result. No upload, no server processing, no waiting in queue.

4 compression levels explained

• Light (200 DPI, 0.90 quality) — 20-30% smaller. Best for print-ready documents, design portfolios, anything where quality matters most.
• Medium (150 DPI, 0.75 quality) — 40-50% smaller. Recommended default. Looks identical to the original on screen for text and graphics. Best for CVs, contracts, reports, email attachments.
• Strong (96 DPI, 0.50 quality) — 60-70% smaller. Good for uploading to portals with strict 1-2MB size caps. Photos become visibly softer at high zoom; text stays readable.
• Aggressive (72 DPI, 0.35 quality) — 70-85% smaller. Maximum compression. Best for archival, internal documents, or anywhere you need the absolute smallest file. Photos are noticeably degraded.

How it works

1. Upload any PDF (up to 50 MB).
2. Choose a compression level — Light, Medium, Strong, or Aggressive.
3. Click Compress PDF — processing is 100% in your browser, no upload to any server.
4. Wait for the progress bar to complete.
5. Download the compressed PDF — see exactly how much space you saved.

Why use this instead of SmallPDF, iLovePDF, or Adobe?

• Truly free with no daily limit — SmallPDF caps you at 2 PDFs per day. iLovePDF caps file size at 25 MB. Adobe requires sign-in. This tool: unlimited, no signup, no file size cap below 50 MB.
• 100% private — your PDF never leaves your browser. The entire pipeline runs locally. Critical for legal documents, medical records, contracts, tax returns, IDs, and any sensitive material.
• No watermarks — some smaller tools stamp "compressed by" footers. We do not.
• Works offline — once the page loads, you can disconnect from the internet and it still works.
• No account, no email — open and use. No friction.

Common use cases

• Email attachments — most email providers cap at 10-25 MB. Compress larger PDFs to fit.
• Government form uploads — many portals require PDFs under 200 KB, 500 KB, or 1 MB. The Aggressive preset handles these.
• Resume / CV submission — recruiters prefer small files. Compress before applying.
• Scanned documents — 300 DPI scans are huge. Drop to 96 DPI and they fit on a phone screen.
• Archive old files — cut storage costs by 60-80% on long-term archives.
• Share on social / chat — WhatsApp, Discord, Slack all struggle with large files. Compress first.

Frequently asked questions

Will my PDF be uploaded to a server?

No. The entire compression pipeline runs in your browser using JavaScript. The file is read with the standard File API, decoded by pdf.js, rendered to HTML canvas, JPEG-encoded, and re-assembled by pdf-lib. No bytes leave your device. You can confirm this in your browser's DevTools Network tab — filter for the file name and you will see zero outbound requests.

What's the maximum file size?

We support PDFs up to 50 MB. This limit exists because compression happens in your browser memory, and devices with 4 GB or less RAM may struggle with larger files. For larger files, split the PDF first or use our PDF Splitter workflow.

What's the difference between the 4 compression levels?

Light (200 DPI, 0.90 quality) — best for print and design portfolios. Medium (150 DPI, 0.75 quality) — balanced choice for CVs, contracts, email attachments. Strong (96 DPI, 0.50 quality) — good for uploading to portals with 1-2 MB limits. Aggressive (72 DPI, 0.35 quality) — maximum compression for archival, smallest possible size.

Will my text become an image?

Yes — the compression pipeline rasterizes each page to a JPEG image, then reassembles the PDF. Text will no longer be selectable, searchable, or copyable. This is the trade-off for achieving 60-85% size reduction. If you need text to remain selectable, use our PDF Merger with lossless settings instead.

Why is my compressed PDF still large?

If the original PDF was already optimized (text-only, no images), there is little to compress. Try the Aggressive level. If the file still does not shrink, the source may have a different issue — check if it has form fields, signatures, or interactive content. For text-only documents, this tool's compression will be minimal because there are no large images to downsample.

Is there a daily limit?

No. Unlike SmallPDF (2 per day), iLovePDF (25 MB cap), or Adobe (sign-in required), this tool has no daily limit, no file size tier restrictions, and no signup. Compress as many PDFs as your device memory allows.

Why can't AI chatbots compress my PDF?

Large Language Models like ChatGPT, Claude, and Gemini are text-based systems. They cannot read, render, or modify binary PDF files. PDF compression requires the same capabilities as a PDF reader — parsing the binary structure, rendering each page as an image, and reassembling the file. This tool runs the actual PDF processing pipeline in your browser; AI can only explain how to use a tool, not operate one.