Free PDF Tool · Compress

Reduce PDF Size

Run reduce pdf size in your browser. Free, private, no signup — your selected files are processed in your browser and are not uploaded to our server.

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Drop your file here

or click to browse from your device

Accepts: .PDF
How it works: Compression re-renders each page as a JPEG and rebuilds the PDF. Image-heavy PDFs may shrink a lot, while text-only or already-optimized PDFs may shrink very little. The output is image-based — text selection and searchability are removed. For text-preserving compression, use a desktop tool like Acrobat Pro.

About this Reduce PDF Size

Reduce the size of your PDF files quickly with our reduce pdf size tool. We re-render each page as a JPEG at the selected or iterated quality setting and rebuild the PDF, typically cutting file size by a widely varying amount depending on the content.

This online reduce pdf size works fully in your browser. You can pick a target file size (e.g. 200 KB or 1 MB) and the tool will iteratively adjust quality to get close to the target where possible; some PDFs cannot reach very small targets without heavy quality loss, and final size may be slightly over or under — useful for email attachments, web uploads, and government portal submissions that enforce strict size limits.

Your privacy is the default. Your selected files are processed in your browser and are not uploaded to our server; all processing happens client-side using browser PDF libraries such as pdf-lib and PDF.js, plus browser canvas rendering. Closing the tab clears the working session from this page; downloaded files remain on your device.

This tool is free to use with no signup required. Large files may be limited by your browser’s memory and device performance. Part of PDF Tools Base, a privacy-first collection of 161 PDF utilities. Bookmark the page for next time, and explore related tools in the footer below.

How to use the Reduce PDF Size tool

  1. Drop your PDF file.
  2. Optionally set a target size or quality level.
  3. Click Process and wait for compression.
  4. Download the compressed PDF.

Why use PDF Tools Base?

100% Browser-Based

Reduce PDF Size processes selected files in your browser. Your selected files are processed in your browser and are not uploaded to our server.

No Server Upload, No Signup

Your selected files are processed locally in your browser. No account, no server upload, no email needed.

No Watermark Ever

Outputs are clean. We never stamp our brand or a paywall watermark on your files.

Free to Use

No accounts and no signup. Use the tool as much as you need within reasonable browser limits.

Works on Every Device

Windows, Mac, Linux, iPhone, iPad, Android, Chromebook. Any modern browser.

Built on Open Source

Powered by browser-side PDF libraries such as pdf-lib and PDF.js, plus browser canvas rendering.

Common uses for reduce pdf size

Heavy scans

Shrink large scanned PDFs for sharing.

Grayscale option

Convert color scans to grayscale for extra savings.

Before archiving

Reduce size to store documents efficiently.

Upload limits

Meet form and portal size caps.

Quality control

Choose how much to trade size for clarity.

Local & private

No uploads, no signup.

Frequently asked questions

Is Reduce PDF Size safe to use?

Yes. Everything happens in your browser. Your selected files are processed in your browser and are not uploaded to our server. Closing the tab clears the working session from this page; downloaded outputs remain on your device until you delete them.

Do I need to register or sign in?

No. No account, no email, no sign-up. Open the page and start using the tool immediately. Free to use, no signup needed.

Is there a watermark on the output?

No. PDF Tools Base never adds a watermark or branding to your output. Your final file is clean — just what you produced from the original.

Is there a file size limit?

There is no fixed limit. Compression renders pages in your browser, so RAM, page count, DPI/quality settings, and PDF complexity affect what is feasible. Phones may struggle with large PDFs; try splitting first, lowering DPI/quality, or using a desktop browser.

Does this work on mobile devices?

Yes. The tool works on all modern mobile browsers: Chrome on Android, Safari on iOS, Firefox, Edge, Brave. The drag-and-drop also accepts files from your phone’s file manager.

How much smaller will reduce pdf size make my PDF?

Image-heavy PDFs may shrink a lot, while text-only or already-optimized PDFs may shrink very little. The final size depends on page count, images, target size, and quality settings.

Will text still be searchable after reduce pdf size?

No. Compression rerenders each page as a JPEG, so the text becomes part of an image. If text searchability matters, use a lossless compressor (desktop) or keep the source PDF.