✓ 100% Free🔒 Files Stay On Device⚙ Ghostscript Engine

Compress PDF Reduce File Size

Professional-grade PDF compression powered by Ghostscript. Text, fonts and vectors preserved at every level.

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Drop your PDF here

or click to browse — max 200 MB

0 / 1 filesMax 200MB per file

How to Compress PDF Files Online — Free

Reducing PDF file size is instant and completely free with Doclair. No software to install, no account required.

Click Drop your PDF here or drag your PDF file into the upload area.

Choose a compression level — Standard for full print quality, Balanced for sharing, or Maximum for the smallest possible file.

Click Compress PDF and wait while Ghostscript processes your file entirely in your browser.

Click Download to save your compressed PDF. The original vs compressed size is shown.

Why Ghostscript gives better results than other online tools

Most browser-based PDF compressors use simple object stream packing. Doclair uses Ghostscript — the same engine behind Adobe Distiller and professional print workflows — compiled to WebAssembly so it runs entirely in your browser. Ghostscript subsetsfonts to used characters only, downsamples images with bicubic interpolation, and removes hidden layers of PDF bloat that other tools miss.

Is it safe to compress confidential PDFs online?

Absolutely. Doclair processes your PDF entirely inside your browser using WebAssembly. Your file is never transmitted to any server — not even Doclair's. Confidential contracts, medical records, and financial statements can be compressed with complete privacy.

Compress PDF on iPhone and Android

Doclair works in mobile browsers — Safari on iPhone and iPad, Chrome on Android — with no app download required. Tap the upload area to open the Files app picker, select your PDF, choose a compression level, and download the result.

Frequently Asked Questions

Yes, completely free with no limits. There are no daily caps, no subscription fees, and no watermarks added to any output file — ever.

Text, fonts, and vector graphics are fully preserved at every compression level — only raster images are re-encoded. For text-heavy PDFs compression is essentially lossless. For image-heavy PDFs, Balanced compression preserves visual quality in almost all cases.

Results vary by content. Image-heavy PDFs (scans, presentations) typically compress 40–70%. Text-only PDFs compress 10–30% since font subsetting and object stream packing are the main levers — text is stored as vectors, not pixels.

No. Your file never leaves your browser. Doclair runs Ghostscript compiled to WebAssembly entirely in your browser tab. Nothing is transmitted to any server — not even ours.

Standard targets 300 DPI — ideal for documents that will be printed. Balanced targets 150 DPI — the sweet spot for email attachments and on-screen reading. Maximum targets 72 DPI — smallest possible file, best for web publishing or archiving.

Password-protected PDFs need to be decrypted first. Use the Remove Password tool on Doclair to unlock the PDF, then compress it. Both tools work entirely in your browser.

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