Elysia Tools: Tools, Visualizations, and Samples in One Place

XLSX CSV Batch Converter

Batch convert CSV/TSV to XLSX or convert XLSX back to CSV/TSV with delimiter and encoding handling

Format Conversion

XLSX JSON Transformer

Bidirectional conversion between JSON arrays and Excel sheets, with nested object flattening and restoration

Format Conversion

PDF Grayscale Converter

Convert color PDF documents into grayscale or high-contrast black-and-white output for printing and file-size reduction

PDF Tools

PDF Stationery Underlay

Place document pages on top of stationery/background template pages (letterhead style underlay)

PDF Tools

PDF Repair Corrupt

Attempt to repair damaged PDF headers and broken/missing XRef tables

PDF Tools

Video Stream Extractor

Extract audio and/or video streams from a video file using stream copy (no transcoding) after probing stream availability

Media

Video Horizontal Flip

Flip video horizontally (mirror left-right) while keeping original container format and copying audio stream when possible

Media

PDF AcroForm Filler

Fill standard PDF forms programmatically (text, checkbox, radio, dropdown/list) using JSON data injection

PDF Tools

Burning Ship Fractal - Fractal Explorer

Explore a variant of the Mandelbrot set - unique flame shape through absolute value transformation

Replicator Dynamics Visualizer

Interactive exploration of evolutionary game dynamics on the simplex

Entropy / KL Divergence

Interactive teaching demo for entropy, cross-entropy, and KL divergence with real-time parameter control.

Markov Chains and Stationary Distributions

Explore probability flow, convergence to equilibrium, and the mathematics of Markov processes

Quantum Harmonic Oscillator - Interactive Visualization

Interactive visualization of quantum harmonic oscillator energy levels and wave functions

Infinite Square Well - Interactive Visualization

Interactive visualization of particle in infinite square well potential

Quantum Tunneling - Interactive Visualization

Interactive visualization of quantum tunneling effect through potential barriers

Hydrogen Atom Wave Function Visualization

Explore the quantum mechanical probability distribution of hydrogen electron clouds

ODP Samples

Sample OpenDocument Presentation files for slide parsing and conversion tests

2 samples

ODT Samples

Sample OpenDocument Text files for document parsing and layout conversion tests

2 samples

ODS Samples

Sample OpenDocument Spreadsheet files for worksheet parsing and report conversion tests

3 samples

DOCX Samples

Sample DOCX documents for word-processing testing and parser validation

3 samples

XLSX Samples

Sample XLSX spreadsheets for worksheet parsing and data extraction testing

3 samples

PPTX Samples

Sample PPTX slide decks for presentation parsing and conversion workflows

2 samples

PDF Samples

Generated PDF samples from tools dated 2026-02-01 to 2026-02-10

26 samples

Markdown Slide Deck Samples

Remark/Marp style Markdown slide decks for testing PDF export layouts

1 samples