電子メールに添付するために PDF を圧縮する

Most email providers reject attachments over 20-25 MB. Compress your PDF locally to fit any inbox — no quality loss, no upload, no privacy risk.

ブラウザベースのツールを使用する理由は何ですか?

Email providers like Gmail (25 MB), Outlook (20 MB), and Yahoo (25 MB) have strict attachment limits. A scanned contract, a design portfolio, or a multi-page report can easily exceed these limits. Our PDF Compress tool reduces file size by 30-70% through local browser-based optimization — your document never leaves your device, making it safe for confidential business files, legal contracts, and personal records.

仕組み

1. Upload your PDF — drag and drop into the tool.
2. Automatic compression — the tool optimizes images and removes redundant data.
3. Download and attach — your compressed PDF fits any email provider's limits.

共有する前に PDF ファイルを圧縮またはクリーンアップする必要があるのですか?

PDF documents often contain hidden metadata including the author's name, software used to create the file, creation and modification dates, and even embedded comments or annotations. When you email a PDF or upload it to a website, this information becomes publicly visible.

Large PDF files can also be problematic — they exceed email attachment limits, take longer to upload, and consume more storage space. Our browser-based PDF tools compress, merge, and clean your documents instantly without uploading anything to external servers.

PDF ツールの仕組み

1. Click the tool button above to open the PDF utility
2. Drag and drop your PDF file into the browser window
3. The tool processes your file entirely on your device
4. Download the optimized PDF — smaller, cleaner, and metadata-free

PDF から削除されるメタデータは何ですか?

Our PDF metadata remover strips author names, company information, creation dates, modification history, software identifiers, and any embedded comments. The document content remains unchanged; only the tracking information is removed for your privacy.

ブラウザで PDF を処理しても安全ですか?

Absolutely. Unlike online PDF converters that upload your files to remote servers, our tools run entirely in your browser using WebAssembly technology. Your documents never leave your device, ensuring complete confidentiality for sensitive contracts, resumes, or personal documents.