Easy editing
Flatten PDF focuses on practical edits most people need every week.
PDFフラット化
フォームと注釈をフラット化。
ローカル処理 — ファイルは端末内に留まります
ファイルをここにドロップするか、クリックして選択
1回あたり最大 50 MB
Free online Flatten 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 Flatten PDF
Flatten 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, Flatten 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 Flatten PDF
- 1
Upload your PDF to Flatten 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
Flatten 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 Flatten 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 Flatten PDF free?
- Yes — no signup or subscription required.