Compress PDF to any size

Enter your target from 1 KB to 350 MB, choose KB or MB, add an unlocked PDF and click Start Compressing. Structural optimization runs first. Then the chosen image method searches supported image settings. Check Target and Actual sizes before downloading. KB is 1,024 bytes and MB is 1,048,576 bytes here.

Yes. Positive decimal values are supported, such as 137 KB, 200 KB or 3.4 MB. Presets include 50, 90, 100, 150, 200, 300, 420, 500, 650 and 820 KB and 1, 2, 5 and 10 MB. They update the same compressor; they are not separate pages or automatic processing actions.

Quality mode preserves the original embedded image dimensions and searches JPEG quality. DPI mode keeps JPEG quality at 94% and searches image resolution without upscaling. For targets below 1 MB, Quality stops at 84% quality and DPI stops at 200 PPI. Native PDF text and vector graphics remain unchanged in either method.

Native selectable text, fonts, vector graphics and editable fields are retained without flattening. Scanned text is inside an image, so its appearance can change. The sub-MB safeguards limit degradation; compare original and output previews before sharing. Exact scan quality cannot be guaranteed.

Some files contain large attachments, unsupported images or already optimized content. If the target cannot be met within the chosen method and safety limits, the result explicitly shows Target not reached and its actual size. You may download the best tested readable result, choose another method or raise the target. We never pad a file or claim an oversized result meets its limit.

Basic uses up to 300 PPI and 90% JPEG quality, Strong 144 PPI and 70%, and Extreme 72 PPI and 50%. Existing images are never upscaled. Final savings depend on the source file. More options also provides Medium 65%, Good 82% or Best 94% quality, 72–720 PPI, grayscale, faster mode, optional multimedia removal and lossless font-stream recompression. These manual settings are separate from automatic target mode.

Up to ten PDFs, 350 MB each, 350 MB combined and 150 pages each. Compression is sequential with individual PDF and ZIP downloads. Multimedia annotations are kept by default; you can explicitly discard Movie, Sound, Screen and RichMedia annotations. Ordinary attachments remain.

Yes. PDFs are processed in a dedicated browser worker. Files are not uploaded to the tooldu.com backend. Download results or continue into another tool through temporary local storage.

This tool is completely free without registration, payment or a session time limit. Use it as often as you like. Published file, codec and device-memory limits still apply. Other tools have separate access rules.

Use up to ten unlocked PDFs within 350 MB combined and 150 pages per PDF. Device memory can impose lower practical limits. Digitally signed files require an unsigned copy. Transparent, stencil, inline and unsupported images may remain unchanged. Attachments are kept, so they can prevent a small target from being reached.