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Offline C Lab
Run beginner-to-intermediate C programs without internet
Supports variables, arrays, arithmetic, comparisons, if / else, for / while, functions, printf, scanf, strings, and common standard-library helpers. Type scanf input below one value per line. Errors show line and column.
source.c
stdin — values for scanf
terminal
Ready. Press Run to execute your C program.
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Offline Circuit Lab
Build and test small digital-logic circuits without internet
Add inputs, gates, and outputs from the palette. Click one node, then another to connect them. Input nodes toggle between 0 and 1. This is a focused digital-logic sandbox, not a native Arduino simulator.
Add component
Ready. Add an input and a gate to begin.
Tip: double-click an input to toggle it. Click a source node, then a destination node to create a wire.
External simulators
These links need internet; the board above works offline.
Circuit notes
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PPT & Poster Studio
Offline slide, poster, thumbnail, and presentation maker
Start with a template
Choose a ready-made slide, upload your own background, or open an offline project. You can edit every object after starting.
Editable offline project files use JSON. PDF and PPT/PPTX files can be attached as a reference cover, while native object-by-object conversion is not claimed in this single-file offline build. Export to PDF uses the browser print dialog.
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Unit Converter
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QR Code Generator
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Drawing Canvas
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World Clock
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Checklist
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Bookmarks
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Clipboard History
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Text Extractor (OCR)
📸 OCR requires Tesseract.js or a cloud OCR API. Upload an image below and connect an OCR service in Settings for full text extraction.
Upload Image
Click to select an image for text extraction
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Image Tools
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Image Cropper
Crop & resize images
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Image Converter
Convert between formats
Upload Image to Edit
JPG, PNG, WebP, GIF supported
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Document Scanner
📷 Camera scanning and auto-crop use browser MediaDevices API. AI recreation requires a backend OCR/AI service — configure in Settings.
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Protect app with a 4-digit PIN
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Export All Data
Download JSON backup
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Irreversible — deletes everything
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Save this recovery code in a safe place. Use it to reset your PIN if forgotten.
MV-XXXX-XXXX-XXXX
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Mohammad Vault v2.0.0
One Secure App For Every Student
Built with ❤️ using HTML, CSS & Vanilla JS
Offline-first · IndexedDB · PWA