Technical Utilities for Power Users.
A collection of 15 free, high-performance browser tools for developers, designers, and data analysts — hex and byte converters, image processing utilities, a 2D-to-3D CAD/STL exporter, generative geometry tools, and lightweight mechanics/aerodynamics simulators. Every tool runs entirely client-side: nothing you upload or type is sent to a server.
MilliCAD
Simple, easy-to-use 2D-to-3D CAD tool for making printable STL files.
GIFSpeed-0
Speed up or slow down a GIF's playback while keeping high-fidelity color and frame quality.
HexToAscii
Decode hexadecimal byte strings into readable ASCII text in real time.
HEXTxt
Two-way text/hex encoder with endianness and delimiter controls.
NumericStats
Extract numbers from raw text and get instant sum, average, count, and range.
HilbertsSquiggle
Generates Hilbert space-filling curves at adjustable recursion depth.
JPGqualityADJ
Live JPEG compression control to balance file size against visual quality.
PNG Color Swap
Replace a specific color across a PNG while preserving shading and edges.
TXT to Image Gen
Render styled text onto a canvas and export it as an image.
PNG color Remover
Make a chosen background color transparent with adjustable tolerance.
Fractal Twiggg
Recursive procedural generator for branching fractal tree structures.
Cargo Packing Simulator
3D load-planning for a trailer, cargo van, container, or storage unit.
Propeller Simulator
Models how pitch, diameter, and RPM affect propeller thrust and efficiency.
Mechanical Simulator
Lightweight sandbox for experimenting with shapes, forces, and basic physics.
Wind Tunnel Simulator
Estimates drag and lift coefficients for a shape you configure.
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About SimpleToolHub
SimpleToolHub is a free collection of single-page browser utilities built for developers, designers, and hobbyists who need a specific job done without installing software or creating an account. Every tool listed above is self-contained: open it, do the task, and leave. There's no sign-up, no file storage, and no server round-trip for your data — conversions, image processing, and simulations all run locally in your browser using JavaScript and the Canvas/WebGL APIs.
The catalog spans a few categories: developer utilities for converting between hex and text (HexToAscii, HEXTxt) and analyzing numeric data (NumericStats); image tools for compression, background removal, and color replacement (JPGqualityADJ, PNG Color Swap, PNG color Remover); generative/visual tools for fractal and space-filling geometry (Fractal Twiggg, HilbertsSquiggle, TXT to Image Gen); and engineering-flavored simulators for load planning, mechanics, propellers, and aerodynamics (Cargo Packing Simulator, MechSim, Propeller Simulator, Wind Tunnel Simulator, MilliCAD).
Click any tool above for a full description, step-by-step usage instructions, and answers to common questions on that tool's own page.