PDF Compress Online | Reduce PDF File Size Free

Compress PDF files online to reduce file size for email and uploads. Adjust quality and scale settings, then download a smaller PDF copy. Designed specifically for developers and professionals, this free online optimizer runs entirely in your browser to process tasks quickly and securely. Enjoy unlimited usage with no data tracking and no registration required.

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pdf tools

email tools

optimizers

Upload PDF

Reduce PDF size with controllable quality, format, and scale settings.

Drop a PDF here or click to browse

No file upload. Runs locally.

Compression Settings

Start with a preset, then adjust image format and render controls for your target size.

Current PDF Password (optional)

Output Profile

balanced

Compression Preset

Page Image Format

Image Quality: 65%

Render Scale: 1.0x

About PDF Compress Tool

A PDF optimizer that shrinks a file by rendering every page to a canvas at a scale you choose, re-encoding it as JPEG or PNG, and rebuilding the document from those images. It runs entirely in your browser, so even a confidential contract or medical record never leaves your machine.

Key Features

Three presets that set every option at once: High Quality keeps PNG pages at 1.6x scale and 95% quality, Balanced switches to JPEG at 1x and 65%, and Maximum Compression drops to 0.8x and 45% for the smallest file
Manual control over scale, JPEG quality, and page image format when a preset lands in the wrong place, with the before and after byte counts reported after every run
Opens password-protected source PDFs when you supply the password, and optimizes scanned documents where the page is already an image and there is no text layer to lose
Processes locally with no upload, no queue, and no file size cap beyond your own available memory

Use Cases

Get a scanned contract or expense report under the 25 MB attachment limit that Gmail and most corporate mail servers enforce
Compress a slide deck or brochure export before uploading it to a website, where large PDFs hurt page load and Core Web Vitals
Shrink a batch of scanned receipts or forms for long-term storage when the originals are photographs rather than generated text

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When this optimizer is the wrong tool

Compression here works by rasterizing: each page becomes a picture of itself. That is the right trade for scans and image-heavy documents, and it is what makes the savings large. It is the wrong trade for a text PDF exported from Word, LaTeX, or a design tool. Rasterizing throws away the selectable text layer, so the result is no longer searchable, cannot be copied from, and stops working with screen readers. A text-only PDF is also already efficiently compressed, so converting its pages to images can leave you with a bigger file than you started with. If your PDF has selectable text and you only need a modest reduction, downsampling the images inside it with a desktop tool will beat this approach.

Privacy & Security

All processing happens locally in your browser. Your data never leaves your computer, ensuring complete privacy and security.

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Frequently asked questions

What is PDF Compress Online used for?

Compress PDF files online to reduce file size for email and uploads. Adjust quality and scale settings, then download a smaller PDF copy.

Is PDF Compress Online free to use?

Yes. PDF Compress Online is completely free with no usage limits, and there is no paid tier required to use it.

Do I need an account to use PDF Compress Online?

No. PDF Compress Online works immediately in your browser with no signup, login, or email address required.

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