PDF圧縮
目に見える品質の劣化なしにPDFのサイズを削減します。メール送信に最適です。
ここにPDFをドロップするか、クリックして選択
PDFの上限： 100 MB
目に見える品質の劣化なしにPDFのサイズを削減します。メール送信に最適です。
ここにPDFをドロップするか、クリックして選択
PDFの上限： 100 MB
A PDF rarely grows because of its text. The weight almost always comes from high-resolution images, scanned pages saved at full quality, embedded fonts and metadata that pile up with every save. A single scanned document can reach tens of megabytes for no obvious reason.
That is why the ability to compress a PDF matters every day. Email services enforce attachment limits, online forms reject oversized uploads, and a heavy page loads slowly for your readers. Learning to reduce PDF file size lets you send documents by email, submit upload forms without errors, and keep pages fast before you publish or archive them.
Compressing a PDF does not mean degrading everything. The tool downsamples images to drop unnecessary pixels while keeping text crisp and readable. You stay in control of the trade-off between visual quality and final size: light compression preserves detail, while stronger compression favours the smallest possible file.
A few companion habits round this out. For text-only documents, the grayscale tool converts colours to shades of grey and trims the size further. For online delivery, web-optimize arranges progressive web loading so the first page appears before the download finishes. And if you are gathering several sources, run merge first, then compress a single combined file.
On privacy, the approach is simple: no sign-up is required and your files are deleted automatically after processing. Your documents are used only to produce your compressed PDF, nothing more.
Upload
Upload your PDF file into the drop area (or drag and drop it).
Configure
目に見える品質の劣化なしにPDFのサイズを削減します。メール送信に最適です。
Download
Download the resulting document in one click — your files are deleted automatically after processing.
Upload your PDF and choose a compression level. Our tool optimises images and the document structure to reduce its weight while preserving readability.
Compression is optimised to remain visually imperceptible in most cases. You can choose a stronger level if size matters more than quality.
Compression mainly optimises embedded images, which can slightly soften them. Text and vector elements stay sharp and perfectly readable.
A PDF that is already optimised or made mostly of text will shrink only a little, since there is little data left to reduce. The savings are much larger for files full of images or scanned photos.
Yes, this tool is 100% free with no usage limits. No sign-up, no credit card and no watermark added to your documents.
Yes. Your files are processed securely and automatically deleted from our servers after processing. Nobody has access to them.