Free · No sign-up · Runs in your browser

File tools that never see your files.

Resize passport photos, compress images, format JSON and more. Everything runs on your device, so your files are never uploaded to a server.

No uploadsNo accountOpen to inspection

Drop a file here

Photos, PDFs, text or JSON. You can also paste from your clipboard.

Or try a tool:
Quick Presets · One-Click WorkflowsClick any preset—or drop a file directly onto it—to process your file immediately. You can save your own presets inside any tool.
All tools

Pick a tool. Add a file. Download.

Every tool works the same way, so once you have used one you know them all.

How it works

Three steps, and none of them upload anything.

STEP 1

Add a file

Drop it on the page, choose it from your computer, or paste text. It opens inside this browser tab.

STEP 2

Adjust the settings

See a live preview as you change size, quality or format. Basic settings first, Advanced when you want control.

STEP 3

Download the result

Check the before and after, then save the file. Delete it from the tab with one click when you are done.

Why your files stay private

Each tool runs inside your browser tab, using your own computer. Our servers only send you the page. They never receive your file, because there is nowhere in the page to send it. While a tool works you will see a paper envelope close over your file. That is our way of showing that it stays sealed in your tab.

Your browser tabyour fileOur serversnever receiveyour files
Check it yourself

Do not take our word for it.

Process something above, then look at these numbers. They are measured in this tab.

0

Network requests while processing

Counted from the browser's own request log around every run. It should stay at zero.

Hashing…

Fingerprint of this page's code

A live SHA-256 digest of the runtime code executing in this tab, verified alongside our WebAssembly module hashes.

connect-src 'self'

Blocked by the site's own rules

Enforced by a strict Content-Security-Policy header that blocks the page from contacting any external server.

Try it: open your browser's developer tools, switch to the Network tab, then process a file. You will see no upload. You can also switch off your internet connection first. The tool still works.
For developers and AI agents

The same tools, callable by code.

Every tool is described by one manifest. The page builds its settings from it, and AI agents (Claude, ChatGPT, Cursor) call the same tool through the Model Context Protocol. The same input always gives the same output, whether a person clicked or an agent called.

MCPJSON schemaSame result as the website
TECHNICAL SPECIFICATION & USER GUIDE · PDF & DOCUMENTS
How PDF機密情報墨消し・黒塗りツール Works Locally in Your Browser
Available in:EnglishالعربيةDeutschEspañolFrançaisहिन्दीBahasa IndonesiaItaliano日本語한국어NederlandsPolskiPortuguêsРусскийTürkçeTiếng Việt简体中文
Direct Answer Summary (Optimized for Search & AI Citations)
真の不可逆消去を実現。指定された領域のベクトルおよびテキスト要素を完全に削除します。
Technical Privacy Guarantee:Your file is processed 100% locally in your browser memory and is never uploaded. This page contains advertisements served by Google AdSense to sustain free operation without accounts or subscriptions.
Share Privately:(0 trackers · plain links)
単に黒い四角形を上に重ねるだけの不完全な墨消しとは異なり、指定領域のテキスト情報や基礎バイナリデータを恒久的に抹消します。コピペやAI解析でも復元不可能です。
Step-by-Step Instructions
  1. 墨消しを行いたいPDFを開きます。
  2. 黒塗りしたい機密テキストや領域をドラッグして指定します。
  3. 「不可逆消去を実行」をクリックしてデータを抹消します。
  4. 安全に処理されたPDFをダウンロードします。
What to Expect & Performance Benchmarks
High-fidelity processed output with zero data loss.
Execution Latency: Executed in sub-second speeds via WebAssembly and Canvas APIs.
Supported Limits: Processes typical files up to 100 MB directly in RAM.
Privacy Verification & Technical Guarantee
Processed entirely inside the local browser sandbox using client-side JavaScript, WebAssembly, and WebCrypto.
  1. Open browser Developer Tools (F12) -> Network tab.
  2. Execute the tool and verify 0 outbound network requests occur.
Open source under MIT License.
Architecture & Standards Comparison
AttributePrivacyFold Local EngineTraditional Online Converters
Execution Runtimepdfium (In-Browser RAM)Remote Cloud Server Buckets
Standard ComplianceISO 32000-1 / Destructive ScrubOpaque Server Scripts
Network Footprint0 KB uploaded (Client-Side Only)Full File Upload Over Internet
Offline Support100% Functional via Service Worker PWAFails Without Active Server Connection
Agent IntegrationDeterministic JSON-RPC / MCP Tool SchemaAd-Hoc REST Upload Form
Frequently Asked Questions
黒塗りの下の文字をコピーして読まれる心配はありませんか？
ありません。下層のテキストデータ自体をバイト単位で完全に消去しています。
画像の上の文字も消せますか？
はい、ラスター画像の一部としても完全に塗りつぶされ再エンコードされます。
Written by: PrivacyFold Engineering Team ·Verified by: Gaurav Suthar (2026-11-11)
Official Specifications & Standards: ISO 32000-1 / Destructive Scrub