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Open Tech Tools (available at opentechtools.org) is a suite of free web-based utility tools built by Open Tech Academy. Every tool runs client-side inside the user’s browser, ensuring that files never touch a remote server, offering complete privacy.

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Design Principles

  • No Paywalls or Ads: Unlimited, free usage for all users.
  • Privacy First: Calculations and conversions happen locally on your computer.
  • Zero Server Uploads: Unlike traditional converters that upload your documents to third-party servers, your data remains in your browser.

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Available Utilities

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1. Image Converter

Easily convert images between popular formats:
  • Supported Formats: PNG, JPEG, WEBP, BMP, and SVG.
  • Features: Quality compression controls, bulk image resizing, and aspect ratio locks.

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2. PDF Converter & Editor

Manipulate and edit PDF documents without exposing sensitive information:
  • Features: Convert images to PDF, merge multiple PDFs, extract individual pages, or split documents by section.

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3. Audio & Media Converter

Convert audio tracks locally:
  • Supported Formats: MP3, WAV, OGG, M4A, and WebM.
  • Features: Bitrate adjustment and audio track trimming.

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4. Data Converter

Parse and translate data schemas:
  • Supported Translations: JSON to CSV and CSV to JSON.

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5. Text Toolkit

Clean, format, and manipulate text:
  • Features: Uppercase, lowercase, title case, sentence case, trim whitespace, and character/word statistics.

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6. ZIP Builder

Package multiple files directly in the browser:
  • Features: Client-side ZIP archive creation using fflate with custom levels.

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Encrypted Sharing

Open Tech Tools provides a secure, end-to-end encrypted file sharing utility.
  • Client-Side Encryption: Files are encrypted with AES-GCM (256-bit) in the browser using the Web Crypto API before upload.
  • Secure Link Generation: The decryption key is appended to the URL hash fragment (#), which is never sent to the hosting server.
  • Expiration Controls: Set files to expire after 1 hour, 6 hours, 24 hours, or 7 days.
  • QR Code Sharing: Instantly generate QR codes for secure mobile downloads.

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Contributing & Open Source

Open Tech Tools is fully open-source and welcomes community contributions.

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Development Setup

  1. Clone the repository: git clone https://github.com/opentechacademy/opentechtools
  2. Run a local web server (e.g. npx netlify dev or any static file server) to load the assets under public/.
  3. Open http://localhost:8888 or your local port in your browser.

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Netlify Functions

The E2E encrypted share functionality uses Netlify functions located in netlify/functions/ to store encrypted file chunks in Netlify Blobs. Make sure to configure the appropriate Environment Variables (LMS_DATABASE_URL if linking to database systems, or Netlify Blob permissions) when deploying your own instance.
Last modified on June 30, 2026