Reduce PDF file size using the compression options available in PDFKaka, then review the result before downloading. The achievable reduction depends on the document's images, fonts, structure, and existing compression.
or drop the file here
Up to 50 MiB per PDF
Up to 100 pages
There is no universal reduction percentage. The result depends on the document's images, fonts, structure, and how much compression is already present.
It can. Recommended compression preserves document structure where possible. Strong and Maximum compression rebuild every page as a JPEG image, which can reduce visual quality and remove selectable text, links, forms, annotations, accessibility data, and signatures.
No exact output size is promised. Compress the file and check the downloaded result against your limit.
Yes. Scanned PDFs are supported, but image-heavy files may respond differently from text-based PDFs. Strong and Maximum compression rebuild pages as JPEG images.
The source may already be compressed, may contain mostly efficient text/vector content, or may have document structures that cannot be reduced much without stronger changes.
No. Selected file contents are processed locally in this browser during the normal workflow.
还需要处理其他文档任务？ 所有工具.
Compress PDF should explain the trade-off between file size and document quality. Use the tool's real modes, keep the original, and inspect the downloaded copy before replacing or submitting anything.
PDFKaka first offers structure-preserving compression for documents where selectable text and interactive features matter. Stronger image-based modes are available for scanned or image-heavy files, but no mode promises an exact final size. The result depends on page count, dimensions, colours, and source content.
Recommended compression safely rewrites the document structure without intentionally turning every page into an image. It publishes a result only when the output is meaningfully smaller.
Strong and Maximum modes render pages as compressed images. They can reduce scans more substantially, but fine print, signatures, diagrams, and identification details may become harder to read.
Recommended mode keeps selectable text and document features where possible. Stronger image-based modes do not retain selectable text, links, forms, accessibility data, or signatures, so keep the original PDF.
Standard compression reduces file size but does not guarantee an exact final byte size. Check the downloaded result against the upload limit.
Digitally created text PDFs can already be compact. Recommended compression will not publish a larger or negligibly smaller copy just to claim success.
No. Compression is processed in your browser.