⚡ Free browser-based PDF tool

PDF Compressor Online – Reduce PDF File Size

Compress PDF files online for free and make large documents smaller for email, websites, forms and uploads. Your PDF is processed in your browser and is not uploaded by this tool.

🔒 Browser processing ✓ No signup ✓ No watermark 📱 Mobile friendly

Compress your PDF

Choose a compression level based on the quality and file-size reduction you need.

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Drop a PDF here or click to choose a file PDF only • Processing happens locally in your browser

Compression level

Balanced is designed for everyday scanned and image-heavy PDFs.

Image resolution

Lower DPI usually creates a smaller file but may reduce image/text sharpness.

Preparing…

Ready. Select a PDF to begin.

✓ Compression complete

Original size—

Compressed size—

Size change—

Free PDF Compressor Online

Use the 5iTech PDF compressor to reduce PDF file size without installing desktop software. It is designed for PDFs that contain scanned pages, photographs, screenshots and other large images.

How to compress a PDF

Choose your PDF or drag it into the upload area.
Select Light, Balanced, Strong or Maximum compression.
Choose the image resolution if you want additional control.
Click Compress PDF.
Review the original and compressed sizes, then download the result.

Why a PDF may not become much smaller

PDF compression depends on what is inside the document. Scanned and image-heavy PDFs usually have more opportunity for size reduction. Text-only PDFs, vector drawings and PDFs that are already optimized may show little reduction. The tool reports the actual output size instead of promising a fixed percentage.

Privacy-focused PDF compression

This tool performs compression inside your browser. The PDF bytes are processed on your device rather than being sent to a 5iTech upload server. Browser-based processing can use significant memory and CPU for very large PDFs, so your device and browser may affect processing time.

Related 5iTech tools

After compressing a PDF, you may also need to convert, merge or resize files:

Image & PDF Merger – combine images and PDF files into one PDF.
PDF to Image Converter – convert PDF pages to images.
Image Compressor – reduce JPG, PNG and WebP image sizes.
Image Resizer – resize images before creating or compressing a PDF.
5iTech Online Tools – browse more free document and image tools.

PDF Compressor FAQ

Is this PDF compressor free?

Yes. The tool is designed as a free browser-based PDF compressor with no signup required.

Are my PDF files uploaded?

The compression workflow runs in your browser. Your selected PDF is processed locally by the page rather than being uploaded to a 5iTech compression server.

How much can I reduce a PDF?

There is no universal percentage. Image-heavy and scanned documents generally offer more room for reduction than already-optimized text PDFs.

Will compression reduce quality?

Image-based compression can reduce image quality. Light and Balanced settings are intended to retain more visual quality, while Strong and Maximum prioritize a smaller file.

Can I compress a scanned PDF?

Yes. Scanned PDFs are one of the main cases where image downsampling can substantially reduce file size.

Why did my compressed PDF become larger?

Some PDFs are already highly optimized. Rebuilding such a file can occasionally produce little reduction or even a larger result. If that happens, keep the original file.

More PDF tools

→ Merge PDF & Images → PDF to Image → All 5iTech Tools

5iTech PDF Compressor • Client-side processing • Output quality depends on the source PDF and selected settings.