Logics Guru

Developer Tools

Formatters, validators, encoders, generators and converters. Most run entirely in your browser.

Generators

Generators

.gitignore Generator

Build a clean .gitignore for any stack — languages, frameworks, editors and OS.

Runs locally
Generators

Favicon Generator

Create a favicon from text, an emoji or an image, with every size and the HTML to paste.

Runs locally
Generators

Lorem Ipsum Generator

Generate placeholder text in classic Latin, technical or corporate flavours.

Runs locally
Generators

QR Code Generator

Generate QR codes for URLs, Wi-Fi, contact cards and plain text, entirely offline.

Runs locally
Generators

UUID Generator

Generate v4 and v7 UUIDs using your browser crypto API.

Runs locally

Images

Images

Add Watermark to Image

Place a text watermark on an image with position, size and opacity control.

Runs locally
Images

Background Remover

Remove a solid or near-solid background from an image, entirely in your browser.

Runs locally 1 uses
Images

Image Color Picker

Pick HEX, RGB and HSL values from any point in an image, and pull its palette.

Runs locally
Images

Image Compressor

Shrink image file size with a live quality preview and side-by-side comparison.

Runs locally 1 uses
Images

Image Converter

Convert between JPG, PNG and WebP in your browser — no upload.

Runs locally
Images

Image Cropper

Crop and trim images with a draggable selection and fixed ratio presets.

Runs locally
Images

Image DPI Converter

Change the DPI of an image, with or without resampling the pixels.

Runs locally
Images

Image Resizer

Resize images to exact dimensions with aspect-ratio locking and presets.

Runs locally
Images

Image Rotator

Rotate images to any angle and flip them horizontally or vertically.

Runs locally
Images

Image to Base64

Turn an image into a Base64 data URL, ready for CSS, HTML or JSON.

Runs locally

Art

Art

ASCII Art Generator

Turn text or images into ASCII art you can paste anywhere.

Runs locally
Art

Pixel Art Maker

Draw pixel art on a grid and export it as PNG or CSS.

Runs locally

Text

Text

ASCII Converter

Convert text to ASCII codes and ASCII codes back to text.

Runs locally
Text

Base64 Decoder

Decode Base64 back to plain text in your browser.

Runs locally
Text

Base64 Encoder

Encode text to Base64 without sending it anywhere.

Runs locally
Text

Binary Translator

Translate text to binary and binary back to text, byte by byte.

Runs locally
Text

Case Converter

Convert text between camelCase, snake_case, kebab-case and more.

Runs locally
Text

Character Counter

Count characters against the limits of the places you actually post.

Runs locally
Text

Markdown Editor

Write Markdown with a live split preview and export clean HTML.

Runs locally
Text

Regex Tester

Test regular expressions with live match highlighting and capture groups.

Runs locally
Text

Word & Character Counter

Count words, characters, sentences, paragraphs and reading time as you type.

Runs locally

Visual

Visual

Color Converter

Convert between HEX, RGB, HSL and CSS colour formats with a live preview.

Runs locally
Visual

CSS Gradient Generator

Design linear, radial and conic CSS gradients visually and copy the code.

Runs locally
Visual

SVG Blob Generator

Generate smooth organic SVG shapes and copy the SVG or clip-path.

Runs locally
Visual

WCAG Contrast Checker

Check colour contrast against WCAG AA and AAA, and fix failing pairs.

Runs locally

Files & PDF

Files & PDF

Compress PDF

Reduce PDF file size by re-encoding pages, with an honest before-and-after.

Runs locally
Files & PDF

JPG to PDF

Combine images into a single PDF, with page size and orientation control.

Runs locally
Files & PDF

Merge PDF

Combine several PDFs into one document, in the order you choose.

Runs locally
Files & PDF

PDF Page Rotator

Rotate PDF pages individually or all at once, and save the result.

Runs locally
Files & PDF

PDF to JPG & PNG

Render every PDF page as a JPG or PNG at your chosen resolution.

Runs locally
Files & PDF

Split PDF

Extract pages or split a PDF into separate documents.

Runs locally

Fun

Fun

CPS Test

Measure your clicks per second over rounds from 1 to 60 seconds.

Runs locally
Fun

Fancy Text Generator

Turn text into bold, italic, fraktur, circled and 25 other Unicode styles.

Runs locally
Fun

Glitch Text Generator

Turn text into glitchy zalgo using stacked Unicode combining marks.

Runs locally
Fun

Reaction Time Test

Measure your reaction time in milliseconds across five rounds.

Runs locally
Fun

Typing Speed Test

Measure your words per minute and accuracy, with a code mode.

Runs locally

Web

Web

cURL Converter

Convert a curl command into fetch, axios, Python, PHP, Go or Laravel HTTP.

Runs locally
Web

HTTP Status Codes

A searchable reference for every HTTP status code, in plain English.

Runs locally
Web

Open Graph Preview

Write Open Graph and Twitter Card tags and see the social preview live.

Runs locally
Web

URL Shortener

Turn a long link into a short, shareable one — with the destination always visible before anyone follows it.

1 uses

Data

Data

CSV Reader

Open a CSV, detect the delimiter, and browse it as a searchable, sortable table.

Runs locally
Data

JSON Formatter

Format, indent, and validate JSON entirely in your browser.

Runs locally
Data

JSON to CSV Converter

Turn a JSON array into CSV, or CSV back into JSON, with a header row.

Runs locally
Data

JSON to YAML Converter

Convert JSON to YAML and YAML back to JSON, with instant validation.

Runs locally
Data

JSON Validator

Check whether JSON is valid and see exactly where it breaks.

Runs locally
Data

Number Base Converter

Convert numbers between binary, octal, decimal and hexadecimal.

Runs locally
Data

SQL Formatter

Beautify SQL queries with keyword-aware indenting, in your browser.

Runs locally

Security

Security

Hash Generator

Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes locally.

Runs locally
Security

JWT Decoder

Inspect JWT header, payload, and expiry without sending the token anywhere.

Runs locally
Security

Password Generator

Generate strong random passwords locally, with tunable character classes.

Runs locally