This document outlines a collection of distinct utility tools designed for various file conversions, document manipulations, and text processing tasks. Each tool offers a specific functionality, often involving transformations between different data formats or alterations of digital media.

The listed tools include:

1. excel2md: This utility is engineered for the conversion of Microsoft Excel spreadsheet files (e.g., .xlsx, .xls) into Markdown table format. The core methodology involves parsing the Excel document's structure, extracting tabular data from specified sheets, and then programmatically rendering this data into Markdown syntax, complete with appropriate column headers, row delimiters, and cell content. This enables easy embedding of structured data into Markdown documents or repositories.

2. md2table: This tool specializes in transforming Markdown table syntax into HTML table elements. Its primary function is to interpret the Markdown table format (e.g., pipe | delimited columns, hyphen - delimited headers) and then generate the corresponding HTML $<table>$, $<thead>$, $<tbody>$, $<tr>$, $<th>$, and $<td>$ tags. This conversion is crucial for rendering Markdown-formatted tables accurately within web browsers or HTML-based applications.

3. md2text: Designed to convert Markdown-formatted text into plain, unformatted text. The underlying methodology involves parsing the Markdown input, identifying and stripping all Markdown specific syntax elements such as headers (#), bold (**), italics (*), lists (-, *, 1.), links ([text](url)), and code blocks (` ` or __CODE_BLOCK_0__ ```). The output is a clean string containing only the textual content, without any formatting directives.

4. pdf2png: This utility converts Portable Document Format (PDF) files into a series of Portable Network Graphics (PNG) image files. For each page within the input PDF, the tool renders the page content as a raster image. The methodology typically involves using a PDF rendering engine (e.g., based on Poppler, Ghostscript, or commercial SDKs) to draw each PDF page onto an internal buffer, which is then encoded and saved as a PNG image file, preserving visual fidelity of text, graphics, and layouts.

5. qrcode: This tool provides functionality for generating QR (Quick Response) codes and enabling their download. The core methodology employs standard QR code encoding algorithms (e.g., ISO/IEC 18004 standard) to transform input data (such as URLs, text, contact information) into a 2D matrix barcode. Users can typically specify the data content, error correction level, and potentially size or color, with the resulting QR code image rendered and provided for download in common image formats like PNG or SVG.

6. svg2png: This utility is dedicated to converting Scalable Vector Graphics (SVG) files into PNG raster images. The methodology involves rendering the vector-based SVG graphics, which are described in XML, onto a pixel grid. This process requires a rendering engine capable of interpreting SVG commands (paths, shapes, text, transformations) and rasterizing them at a specified resolution to produce a high-quality PNG image.

7. Video Editor: This tool offers functionalities for editing and trimming video files. The core methodology involves operations on video streams, typically using established multimedia frameworks (e.g., FFmpeg). Trimming specifically entails defining start and end timestamps, and then re-encoding or simply stream copying the video and audio data within the specified time range, effectively cutting out unwanted segments. More advanced editing might involve concatenating, overlaying, or applying effects.

8. Video Compression: This utility is designed to reduce the file size of video files. The methodology centers on re-encoding video and/or audio streams using more efficient codecs, lower bitrates, or altered resolution/frame rates. Techniques might include constant rate factor (CRF) encoding, variable bitrate (VBR) encoding, or quantization parameter adjustments, which balance visual quality with file size reduction.

9. md2img: This tool converts Markdown content into image files. The methodology typically involves rendering the Markdown content, possibly through an intermediate HTML or visual rendering engine, and then capturing the rendered output as a raster image. This allows for visual representation of Markdown documents without requiring a Markdown viewer, useful for sharing static snapshots.

10. PDF Editor: This tool facilitates the editing and modification of PDF files. The underlying methodology allows for direct manipulation of PDF elements, which might include adding/deleting pages, rearranging page order, inserting/modifying text, images, or annotations, and possibly forms. This requires a robust PDF parsing and rendering engine that can interact with the PDF's internal structure (e.g., objects, streams, cross-reference tables) while maintaining document integrity.

11. PDF Splitter: This utility is used to split a PDF file into individual pages or ranges of pages. The core methodology involves parsing the PDF document's structure, identifying page boundaries, and then extracting specified pages to create new, independent PDF files, each containing one or more of the original pages. This is typically achieved by manipulating the PDF's page tree and creating new document structures that reference the desired pages.

12. PDF Compress: This tool is designed to reduce the file size of PDF documents. The methodology often involves several techniques: recompressing images within the PDF using more efficient algorithms (e.g., JPEG2000, WebP, or lower quality settings), removing redundant data (e.g., duplicate fonts, unnecessary metadata), flattening layers, or optimizing internal PDF structures. The goal is to minimize file size while preserving document content and readability.

13. Text Counter: This utility counts the number of characters and words within a given text input. The methodology involves tokenizing the input string: counting each character (including whitespace and punctuation) for the character count, and identifying sequences of non-whitespace characters separated by whitespace or punctuation as words for the word count. Specific rules might apply for what constitutes a "word" (e.g., hyphenated words, numbers).

14. Images to PDF: This tool converts multiple image files into a single PDF document. The methodology involves taking one or more input image files (e.g., PNG, JPEG) and embedding each image as a separate page within a newly created PDF document. Each image is scaled and positioned appropriately on its respective PDF page, forming a composite multi-page PDF.