How does Direct Text Sharing work in IH4?

Direct Text Sharing lets you send passwords, API tokens, sensitive credentials, or private notes without creating a text file first. Switch to the 'Share Text' tab, enter your note, and generate a 4-digit PIN. The recipient enters the PIN to view the text directly in their browser with a 1-click 'Copy Text' button or an optional 'Save as .txt' download. The note is permanently wiped from the server immediately upon viewing.

How do I install the IH4 PWA and share files via the system Share Sheet?

Click the 'Install' button in the header or use your browser's install option on mobile or desktop. Once installed, IH4 registers as a native system Share Target. In any other app (photos, documents, notes, browsers), tap 'Share' and choose IH4 to instantly stage your text or file with a 4-digit PIN.

Can a file or text note be retrieved more than once?

No. IH4 uses atomic database locking (SELECT ... FOR UPDATE). As soon as the recipient retrieves the payload—either downloading a file or viewing a text secret in the browser—the physical payload is deleted from disk and the database record is purged immediately.

Atomic One-Time Transfer • PWA Enabled

One-Time File & Text Sharing.
Zero Residual Trace.

Q: What happens if the recipient doesn't retrieve the file or text?

All unclaimed payloads automatically expire after 4 hours and are permanently purged by an automated background garbage collection daemon.

Q: Why is there a 4MB limit?

IH4 is optimized for sensitive lightweight files, keys, credentials, and documents. The 4MB constraint ensures rapid, atomic, in-memory streaming with zero server bloat.

Recipient downloads files or views text once using an ephemeral 4-digit PIN, and the payload instantly self-destructs. Installable as a PWA with native Share Sheet support.

Drag & drop a file here or browse

Max size: 4MB. Payload self-destructs after 1 download/view or 4 hours.

Enter 4-Digit Code

The file will download or text will display, then immediately self-destruct.

Atomic Ephemeral Storage • No Accounts Required

Workflow

How IH4 Works in 3 Steps

Zero accounts, zero permanent links, zero residual footprint.

Choose File or Text

Drop any file up to 4MB, paste a secret note or credentials directly into the text editor, or share straight from another app via the system Share Sheet.

Share 4-Digit PIN

Receive an instant, ephemeral 4-digit PIN. Tell it to your recipient via voice, phone call, or secure chat—no long, indexed, or searchable URLs.

Instant View & Destruction

Recipient enters the PIN. Files download immediately; secret text displays inline with a 1-click copy. The payload is instantly wiped from disk and database.

Security & Mobility

Built for Modern Privacy & Speed

Engineered for frictionless ephemeral transfers with enterprise-grade atomic destruction.

Direct Text Sharing

Secret Notes, Tokens & Credentials

Paste passwords, 2FA backup codes, API tokens, or confidential notes without creating dummy local text files. Recipients view the formatted text directly in their browser with a 1-click copy button or optional .txt download.

PWA + Share Target

Install & Share from Any App

Install IH4 to your home screen or desktop for an instant app experience. Powered by the W3C Web Share Target API, you can tap "Share" inside any mobile or desktop app (photos, notes, browsers) and send content straight into IH4.

Atomic Destruction

Zero Residual Server Footprint

Uses atomic database row-level locking (SELECT ... FOR UPDATE) to guarantee strictly one retrieval. The instant a file is downloaded or text is viewed, the payload is purged from disk and deleted from the database before the connection closes.

4-Hour Expiry

No Accounts, Cookies, or Tracking

No signups, passwords, email verification, or tracking scripts. All payloads are identified only by short-lived 4-digit PINs and are automatically purged after 4 hours if left unclaimed.

FAQ

Frequently Asked Questions

Everything you need to know about IH4 file sharing, secret text, and PWA capabilities.

How does Direct Text Sharing work?

Direct Text Sharing allows you to securely transfer sensitive text—such as passwords, API tokens, crypto addresses, or private notes—without creating a local text file first. Switch to the Share Text tab, type or paste your content (up to 4MB), and generate a 4-digit PIN. When the recipient enters the PIN, the text is displayed inline in their browser with a 1-click Copy Text button and an option to save as a .txt file. The text is permanently destroyed from the server upon being viewed.

How do I install the PWA and use the native Share Sheet?

On mobile (Chrome/Android, Safari/iOS) or desktop (Chrome, Edge), click the Install button in the IH4 header or choose "Install / Add to Home Screen" from your browser menu. Once installed, IH4 registers as a native system Share Target. Whenever you tap the native "Share" button in any other app (photos, documents, notes, or web browsers), select IH4 to instantly stage your text or file with a 4-digit PIN.

Can a file or text note be downloaded or viewed more than once?

No. IH4 uses atomic database row locking (SELECT ... FOR UPDATE). As soon as the recipient retrieves the payload—whether streaming a file download or viewing a text secret in their browser—the physical payload is deleted from disk and the database record is completely erased before completing the request.

What happens if the recipient doesn't retrieve the file or text?

Every upload has a strict 4-hour lifespan. An automated background garbage collection process runs on the server to permanently scrub all unclaimed files and database records.

Why is there a 4MB limit?

IH4 is intentionally optimized for lightweight sensitive files, documents, keys, passwords, and code snippets. The 4MB constraint ensures rapid, atomic, in-memory transfers with zero server bloat and maximum transfer speed.