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PDF ツール

完全にブラウザで PDF を結合、分割、圧縮、整理。

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PDF ツール

Why browser-only PDF tools?

Most online PDF tools require uploading your document to a server. That server processes the file and — depending on the service — may retain a copy, expose it to staff, sell metadata, or be subject to data breaches. For documents that contain sensitive information (contracts, tax forms, medical records, financial statements), uploading to an unknown server is an unnecessary risk.

The PDF tools on this page use pdf-lib and PDF.js — both open-source libraries — running directly in your browser. The PDF never leaves your device. Processing is local, instantaneous (no upload bandwidth wait), and completely private.

Which tool should I use?

For combining multiple PDFs into one, use the PDF Merger. To extract a portion of a document, use PDF Splitter for continuous ranges or Extract Pages for non-contiguous selections. To convert between formats, the JPG to PDF and PDF to JPG tools handle image-to-document and document-to-image conversions respectively. For document preparation, Add Page Numbers, PDF Watermark, and Rotate Pages handle the most common editing tasks. To clean up a PDF, use Compress PDF to reduce file size or Delete Pages to remove unwanted content.

よくある質問

Do these PDF tools upload my files to a server?
No. Every PDF tool on this page runs entirely in your browser using pdf-lib and PDF.js. Your files are never transmitted to any server. Processing happens locally on your device, and nothing is logged or stored.
What PDF version is supported?
The tools support standard PDF 1.x and 2.0 files. Encrypted or password-protected PDFs cannot be processed — you must remove the password before using the tools. PDFs with fillable form fields are supported for most operations.
Is there a file size limit?
There is no imposed file size limit. The practical limit depends on your device's available memory — most modern devices handle PDFs up to several hundred megabytes without issues. Very large PDFs (500 MB+) may be slower to process.
Do the tools work on iPhone and Android?
Yes. All PDF tools are designed mobile-first and work in Safari on iPhone and iPad, and in Chrome and Firefox on Android. On mobile, tap the upload area to select PDFs from the Files app or cloud storage.
Can I use these tools offline?
Once the page is loaded, the tools work without a network connection. The JavaScript libraries (pdf-lib and PDF.js) are bundled with the page — no external requests are made during processing.
How does the PDF compression tool work?
The compress tool removes embedded metadata, author information, and redundant structural data from the PDF. It achieves lossless size reduction — the visible content is unchanged. For image-heavy PDFs, the size reduction is more modest because the bulk of the file is image data.
Why is my PDF not getting smaller after compression?
PDFs that consist primarily of high-resolution images have little redundant metadata to remove. For significant reduction of image-heavy PDFs, the source document needs to be re-exported at a lower image quality setting from the original application.
Can I process password-protected PDFs?
Encrypted PDFs are not supported. Remove the password protection first using your PDF reader's security settings, then use the tools here. This is a deliberate security boundary — the tools do not attempt to decrypt protected documents.
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