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Offline browser-based file encryption tool using AES-256-GCM and Web Crypto API. No uploads, no backend, fully client-side.

2 starsJavaScript

ByteSeal – offline browser-based file encryption (no uploads)

by grayguava·Feb 27, 2026·1 point·0 comments
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AI Analysis

●●SolidCozyNiche Gem

Offline file encryption with versioned format, but competitors like 7-Zip and Cryptomator exist.

Strengths
  • •Versioned container format means future UI changes won't break decryption
  • •PBKDF2 with 250k iterations raises offline brute-force cost meaningfully
  • •Single-purpose design with honest threat model—no false security claims
Weaknesses
  • •No password recovery by design, losing passphrase = permanent data loss
  • •Market already served by Cryptomator, 7-Zip, and VeraCrypt with better UX/options
Category
Security
Target Audience

Users needing simple password-based file encryption without cloud storage

Similar To

Cryptomator · 7-Zip encryption · VeraCrypt

Post Description

I built ByteSeal because I wanted a simple way to encrypt files without trusting any server.

it runs entirely in the browser: - no uploads - no backend - works offline

the container format is simple and versioned so files can be decrypted later even if the UI changes.

demo: https://byteseal.pages.dev

feedback welcome.

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