PDFを結合
Combine multiple PDF files into one document in the order you choose, free and right in your browser.
Select PDF files
or drag and drop files here
Got a password-protected PDF? Unlock it here first
How to PDF ファイルを結合する
1
Upload your PDFs
Drag and drop the PDF files you want to combine directly onto this page. You can select multiple files at once from your computer or phone.
2
Arrange the order
Click and drag the file thumbnails to reorder them. The file at the top will be the first pages in your combined document.
3
Combine and download
Click "Merge PDF" to stitch your files together instantly. Your new, single PDF will download automatically.
Frequently Asked Questions
結合できる PDF ファイルの数に制限はありますか?▼
We don't cap the number of files. Since everything runs locally in your browser, you can usually combine dozens of PDFs at once — the real limit is just how much memory your phone or computer has free.
結合すると元の PDF の品質が低下しますか?▼
いいえ。結合では、既存のページを端から端までつなぎ合わせるだけです。画像の再圧縮やテキストの再レンダリングは行わないため、フォント、写真、書式設定は入力されたとおりに正確に表示されます。
機密文書や機密文書をここに結合しても安全ですか?▼
Yes. Your files are combined inside your own browser tab and never uploaded to a server, so contracts, IDs, or financial statements never leave your device.
A4 とレターなど、異なるサイズの PDF を結合できますか?▼
Yes — use the page size option to force every page to A4 or US Letter, or leave it on "Original" to keep each file's own dimensions untouched.
PDF の 1 つがパスワードで保護されている場合はどうなりますか?▼
You'll need to remove the password first. If we detect an encrypted file during merging, we'll point you to the Unlock PDF tool so you can strip the password before combining.