Tool Directory

Every tool, one boot away.

Search or scan the full SimonOS toolbox. Everything here is live, local-first, and ready to use in the browser.

57

Live tools online

Grouped by category, indexed for search, and linked directly.

Time & Date

3 tools

Converters

7 tools

Text & Code

12 tools

Image

11 tools

PDF Tools

22 tools

Document Tools

2 tools

Time & Date

3 tools

Timestamp Converter

Convert Unix timestamps, ISO strings, and readable dates without guessing which format you are looking at.

Timezone Converter

Translate one meeting time across cities and named time zones with quick previews for the places you care about.

Date Difference Calculator

Calculate days, hours, and calendar parts between two YYYY-MM-DD dates with optional inclusive counting.

Converters

7 tools

Length Converter

Switch between metric and imperial length units instantly, with quick swaps and practical equivalents.

Base64 Converter

Encode and decode UTF-8 text as Base64 for payloads, tokens, and debugging.

URL Encoder / Decoder

Encode and decode percent-escaped URL text for query strings, route parameters, links, and copied payload fragments.

Color Converter

Convert HEX, RGB, and HSL color values with a live swatch, copyable CSS output, and contrast guidance.

Number Base Converter

Convert integers between binary, octal, decimal, hexadecimal, and other bases up to base 36.

HTML Entity Converter

Encode HTML-sensitive characters or decode common named and numeric HTML entities locally.

CSV to JSON Converter

Convert CSV text into formatted JSON rows with quoted-field support and custom delimiters.

Text & Code

12 tools

Text Case Converter

Flip text between sentence case, title case, uppercase, lowercase, slugs, and developer-friendly identifiers.

Format, validate, minify, and sort JSON payloads for APIs, configs, and logs.

Decode JSON Web Token headers and payloads locally so you can inspect claims without verifying or uploading the token.

Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from local text with hex and Base64 output.

Test JavaScript regular expressions against local text and inspect matches, indexes, capture groups, and flags.

Count words, characters, sentences, paragraphs, lines, unique words, and estimated reading time.

Lorem Ipsum Generator

Generate predictable placeholder paragraphs with adjustable sentence and word counts.

Password Generator

Create strong local passwords with configurable length, character sets, and entropy estimates.

Break absolute or relative URLs into protocol, host, path, query parameters, and fragments.

Sort pasted lines alphabetically or numerically, remove duplicates, and copy the cleaned list.

Text Diff Checker

Compare two blocks of text with a local line diff and copy a unified-style change summary.

Generate one or many random UUID v4 identifiers for fixtures and records.

Image

11 tools

Resize PNG, JPEG, and WebP images locally in the browser with aspect-ratio locking and quick export formats.

Image Compressor

Compress PNG, JPEG, and WebP images locally with quality-controlled browser exports.

Crop images by exact pixel coordinates and dimensions, then export a local browser copy.

JPG to PNG Converter

Convert JPG and JPEG images into PNG files locally in the browser.

PNG to JPG Converter

Convert PNG images into JPG files with quality and background color controls.

Rotate PNG, JPEG, and WebP images by 90, 180, or 270 degrees locally.

Flip images horizontally, vertically, or both ways without uploading the file.

Watermark Adder for Images

Add text watermarks to images with position, opacity, size, and color controls.

Image Sharpener

Apply an adjustable local sharpening filter to PNG, JPEG, and WebP images.

Blur PNG, JPEG, and WebP images with an adjustable browser-side filter.

Image Color Inverter

Invert image colors locally to create a negative-style PNG, JPEG, or WebP export.

PDF Tools

22 tools

Combine multiple PDF files locally in the browser with explicit ordering.

Optimize a PDF locally by rebuilding page data and reporting the actual byte savings.

Split a PDF locally by every page, fixed page counts, or custom ranges with separate PDF downloads.

PDF Page Extractor

Extract selected pages from a PDF into a new local file using simple page numbers or ranges.

PDF Page Deleter

Delete unwanted pages from a PDF locally and download a cleaned copy with the remaining pages preserved.

Rotate every page or selected PDF page ranges by 90, 180, or 270 degrees in the browser.

JPG to PDF Converter

Combine JPG and JPEG images into one local PDF with image-sized, A4, or Letter pages.

PNG to PDF Converter

Combine PNG images into a single local PDF with image-sized, A4, or Letter pages.

Image Batch to PDF

Combine JPG, JPEG, and PNG image batches into one local PDF with one image per page.

Add Watermark to PDF

Add a centered text watermark to every page of a PDF with local opacity, color, and rotation controls.

PDF Editor (Text Add)

Add short positioned text stamps to selected PDF pages without uploading the source file.

Crop selected PDF pages by top, right, bottom, and left margins using local browser processing.

PDF Page Reorder

Reorder PDF pages locally by entering a new page sequence, including descending ranges.

PDF Page Number Adder

Add customizable page numbers to every page of a PDF with local format, position, and color controls.

CSV to PDF Converter

Turn pasted CSV rows into a clean printable PDF table with local parsing and page-size controls.

PDF Signature Adder

Add visible typed signature text to selected PDF pages for approvals and review copies.

PDF Form Filler

Inspect fillable PDF form fields, edit their values as JSON, and export a filled local copy.

PDF Annotation Adder

Draw visible review notes or labels onto selected PDF pages without uploading the source file.

PDF Header/Footer Adder

Add centered header and footer text to every page of a PDF with local font and color controls.

PDF Page Size Changer

Place PDF pages onto A4, Letter, Legal, or custom page sizes with fit, fill, and stretch modes.

PDF Bates Numbering

Add sequential Bates identifiers to every PDF page with custom prefix, padding, and placement.

PDF Metadata Editor

Edit PDF title, author, subject, and keyword metadata locally without changing visible page content.

Document Tools

2 tools

Markdown to PDF

Turn markdown notes into a local, printable PDF with headings, lists, quotes, and code blocks.

Extract selectable text from PNG, JPEG, and WebP scans or screenshots in the browser.