Frequently Asked Questions - PDF Compression Help

Simply upload your PDF file to our compressor, choose your preferred compression level, and download the compressed file. The entire process takes just a few seconds and works directly in your browser.

Yes, our PDF compression tool is completely free to use with unlimited compressions. There are no hidden fees and no registration required. Each file can be up to 500MB, and processing happens entirely in your browser.

We currently support PDF files only. The tool handles PDFs with text, images, graphics or a mix of them; image-heavy PDFs shrink the most.

Text stays sharp and selectable in the Low, Medium and High levels, because only embedded JPEG images are re-encoded (85%, 70% and 50% quality). Images can look slightly softer at higher levels; choose Low if quality matters most.

Our PDF compressor supports files up to 500MB. Since everything runs locally in your browser, larger files take longer to process, especially on devices with less available memory.

It depends on the content. PDFs full of JPEG photos or scans can shrink a lot, mostly at the High level. Text-heavy documents with few images shrink only a little, because there is little image data to re-encode. Images with transparency, CMYK or non-JPEG encodings are left unchanged.

Yes, in the Low, Medium and High levels. Only compress to a target size converts pages to images; after that mode the text can no longer be selected or searched.

It renders every page as an image and searches JPEG quality (35-85%) and resolution until the result fits your target, down to a minimum of 10KB. Because pages become images, text is no longer selectable, and a very small target may not be reachable.

Yes. Compression runs locally in your browser. Your files are never uploaded to our servers, so they never leave your device.

Because processing happens in your browser, your original and compressed files stay on your device. No files are stored on our servers.

We never receive your files or their contents. The site does use Google Analytics and Google AdSense cookies (with your consent where the law requires it, for example in the EU and UK), and stores your theme choice in your browser. Details are in the Privacy Policy.

Only file names, sizes and times, in your browser's local storage on this device. The files themselves are never stored, and you can clear the history at any time.

Most PDFs finish within seconds to a few tens of seconds, depending on file size, how many images they contain and how fast your device is. Everything runs in your browser.

Currently, our tool processes one PDF file at a time to ensure optimal quality and performance. You can quickly compress multiple files by repeating the process for each document.

Yes, in current mobile browsers (iOS Safari 16.4 or newer, Chrome for Android). The 500MB limit is the same, but phones have less memory, so very large files may fail there.

We offer 12 free PDF tools: Compress, Compress to Size, Merge, Split, PDF to Image, PDF to JPG, JPG to PDF, PNG to PDF, Rotate, Watermark, Extract Pages and Delete Pages. All of them run in your browser without uploading files.

Yes. All tools are free, with no registration. The site is supported by advertising.

Yes, you can merge as many PDF files as you need. Simply upload all files, arrange them in your preferred order, and click merge.