PDF Compressor — Free Online PDF File Size Reducer

PDF Compressor — Free Online PDF File Size Reducer. Free online PDF compressor. Reduce PDF file size by rasterizing each page to a JPEG image at your chosen quality (text becomes non-selectable) — all processing happens in your browser, no upload required.

Compress one PDF up to 20 MiB and 100 pages on this device. Choose 72, 96 or 150 DPI; lower settings reduce detail. A smaller result contains page images instead of searchable text and interactive links or forms.

If the result is not smaller, download the unchanged original. Cancel stops a pending run. No file is uploaded by this tool; ads make separate network requests. Each rendered page is limited to 16 million pixels and 8,192 pixels per side.

Password-protected and damaged files are unsupported. Page dimensions and displayed orientation are retained, but rasterized output loses text selection, links, forms, bookmarks and digital signatures. Review all pages before replacing your original.

Use PDF Optimizer for a structural re-save that keeps page content; verify its output for your document. PDF Optimizer · Split PDF

Frequently asked questions

How do I reduce the size of a PDF?

Choose a PDF, select a quality preset and click Compress PDF. Review the result and download it. When there is no saving, Download original PDF returns your file unchanged under its original name.

What are the file and page limits?

One non-empty PDF up to 20 MiB and 100 pages. At the selected DPI, each rendered page must fit within 16 million pixels and 8,192 pixels on either side. Try a lower preset for oversized pages. Encrypted files are unsupported.

Will text remain selectable?

A smaller rasterized result contains JPEG page images, so searchable text, links, form fields, bookmarks and digital signatures are not retained. Use PDF Optimizer when you need a structural re-save, and verify the result.

What happens if compression makes the PDF larger?

The rasterized candidate is discarded. The original bytes, filename and existing document features are kept, and the result shows 0% savings.

What does each quality preset do?

Low uses 72 DPI and JPEG quality 50%; Medium uses 96 DPI and 70%; High uses 150 DPI and 90%. Page dimensions and displayed orientation stay the same. Higher settings retain more visual detail but do not guarantee a smaller file.

Can I cancel or change the file?

Yes. Cancel stops a pending run. Choosing another valid file, clearing the selection or leaving the page cancels the old job and discards its result. Your source file is not modified.

Is the PDF uploaded or saved in browser storage?

The compressor reads the selected file on this device and does not upload it or persist it in browser storage. Clear file or leave the page to release the generated result. Advertising makes separate network requests.

How to use this online tool

PDF Compressor — Free Online PDF File Size Reducer is designed for fast browser workflows when you need to format, validate, convert, decode, encode, generate, or inspect data without opening a heavy desktop app. Start with the input field or visible options, review the result, then copy or download the output for the next step.

Private processing in your browser

PDF Compressor — Free Online PDF File Size Reducer keeps the normal processing step local in your browser. That is useful for code snippets, tokens, documents, configuration values, text samples, and other material that should not be sent to a remote service unless you explicitly choose to share it.

When this tool is useful

Use PDF Compressor — Free Online PDF File Size Reducer for repeatable developer tasks, technical documentation, QA checks, quick conversions, debugging, content cleanup, and internal team workflows. The page focuses on clear inputs, immediate feedback, and output that is easy to reuse in code, reports, tickets, emails, or notes.

Practical tips

Before copying the final result, check important details such as spacing, casing, filenames, encoding, token structure, line breaks, or output format. Small checks prevent mistakes when the result is reused in source code, API requests, documentation, spreadsheets, or shared files.