Optimize PDF · quick answer
What Compress PDF does
Use Compress PDF to choose one PDF, reduce its size and compare the result with the original. The result reports the real byte change instead of promising a percentage before examining the document. Filozy starts the document engine only after you choose a file, performs the work inside this tab, and creates a new result for you to save. Your selected document, its filename, and its contents are not sent to Filozy.
How to compress pdf in your browser
- Choose one PDFSelect one PDF from the dropzone. Filozy reads it locally and shows the relevant preview or controls before changing anything.
- Review the settingsMaximum is selected by default for the deepest safe optimization. Balanced focuses on larger fonts in shorter documents; Minimal only repacks the structure for speed. An optional KB or MB limit checks whether the result fits your upload requirement.
- Create and check the resultRun the tool, review the reported page count, size, or notes, then save the newly created file while keeping the original.
Limits worth knowing
- The amount saved depends on what the PDF contains. A file that is already compressed may become only slightly smaller.
Essential questions
How do Maximum, Balanced and Minimal differ?
All levels preserve content and image quality. Minimal only repacks storage. Balanced additionally checks fonts of at least 32 KiB, up to 2 MB decoded, in documents of up to 20 pages. Maximum checks supported fonts up to 4 MB decoded in documents of up to 80 pages. Font changes require the same full-page preservation checks in both modes. Some documents produce the same result at different levels.
Can I compress a PDF to an exact size without changing its appearance?
You can set a maximum size in KB or MB, but not every PDF can reach it without quality loss. Filozy reports whether the target was met and will not remove content or degrade images to force the result.