Easy editing
Compare PDF focuses on practical edits most people need every week.
PDF比較
PDF間の差分を検出。
サーバー処理 — 1時間以内に自動削除
ファイルをここにドロップするか、クリックして選択
2つのPDFファイルをアップロードして、並べて比較レポートを生成します。
1回あたり最大 50 MB
Free online Compare PDF — fast, secure, and quality-focused. PDF900 makes document work simple.
- 100% free, no signup
- Privacy-first design
- Works in your browser
Everything you need from Compare PDF
Compare PDF lets you modify PDF content — add text, marks, numbers, or redactions before sharing.
From marking drafts as confidential to preparing a polished document for clients, Compare PDF covers common edit tasks without desktop software.
Edit tools on PDF900 favor local processing so sensitive annotations and changes stay on your device.
Why use this tool
Professional output
Download a clean PDF ready for email, print, or e-signing.
Privacy first
Browser-based editing keeps your document off third-party servers.
How to use Compare PDF
- 1
Upload your PDF to Compare PDF.
- 2
Configure text, watermark, crop area, or other edit options.
- 3
Apply changes and preview the result.
- 4
Download the edited PDF.
Everything included
No install
Edit in the browser — nothing to download or update.
Free toolkit
Compare PDF is part of PDF900's free toolkit.
Works everywhere
Desktop and mobile browsers supported.
Combine with workflows
Chain with compress, sign, and protect tools.
よくある質問
- Can I undo edits in Compare PDF?
- Re-upload the original if you need to start over before downloading.
- Is editing secure?
- Local tools never upload your file contents to our servers.
- Is Compare PDF free?
- Yes — no signup or subscription required.