Developer Tools

Encoders, formatters, converters, and reference utilities for developers.

126 tools

Command builders & CLI16

AWS S3 Command Generator

Build aws s3 sync, cp, mv, rm and ls commands with the right flags, filters, ACLs and storage classes. Copy-ready output, nothing sent to a server.

curl Command Builder

Build a correct curl command from a form: method, headers, auth, JSON or multipart body, and options. Quoting handled for Bash, PowerShell and CMD.

diskpart Command Builder

Build diskpart scripts to list, clean, partition and format disks safely.

Docker Command Builder

Build docker run, build, and compose commands visually. Set ports, volumes, env vars, resource limits, and security flags. Free, in-browser, no signup.

Exchange Online PowerShell Command Builder

Generate correct Exchange Online PowerShell commands for mailbox permissions, forwarding audits, message trace, groups, calendars and reports.

Git Command Reference

Search 50 Git recipes in plain English. Undo commits, fix mistakes, branch, rebase, stash and recover lost work, with pitfalls and copy-ready commands.

Group Policy Command Builder

Free builder for gpupdate /force, gpresult RSoP reports, and Invoke-GPUpdate commands for local and remote computers. Copy-paste ready.

Microsoft Graph PowerShell Command Builder (Azure AD / Entra ID)

Build ready-to-run Microsoft Graph PowerShell commands for Entra ID users, groups, MFA, licensing, roles, devices and audit logs. Free, no sign-in.

Ollama Command Builder

Build Ollama commands: run and pull with the right tags, Modelfiles with parameters and system prompts, Hugging Face GGUF imports and server env vars.

PsExec Command Builder

Build PsExec commands to run programs on remote Windows machines.

Robocopy Command Builder

Build robocopy copy, mirror and move commands with the right switches.

Rsync Command Builder

Build rsync commands for backups, mirrors and migrations - archive mode, SSH, delete modes, filters and a dry run. Free, runs in your browser.

Virsh Command Builder

Build safe virsh commands for local or remote KVM VMs. 24 actions with risk labels, chained bash scripts, and explicit warnings before destructive ones.

Windows Repair Command Builder

Build SFC, DISM and chkdsk repair commands in the correct order.

Windows Update PowerShell Generator

Generate Windows Update PowerShell commands for local or remote PCs. Scan, install, hide, uninstall, pause, or reboot using PSWindowsUpdate or usoclient.

winget Command Builder

Build winget commands to search, install, upgrade and uninstall Windows apps.

AI & LLM23

A2A Agent Card Generator

Build a valid A2A (Agent2Agent) Agent Card JSON manifest - name, capabilities, input and output modes, skills - ready to serve at /.well-known. Free.

AI Writing Signal Analyzer

Paste text to spot AI writing markers: invisible characters, em dash habits, assistant phrasing and flat sentence rhythm, each explained. Free, in-browser.

Claude Code Config Generator

Build a Claude Code settings.json, CLAUDE.md and .mcp.json. Pick your model, permission mode, allow/deny rules and MCP servers, then copy. Free, no signup.

Codex CLI Config Generator

Generate a Codex CLI config.toml and AGENTS.md. Set model, reasoning effort, approval policy, sandbox mode and MCP servers, then copy. Free, no signup.

Fine-Tuning VRAM Calculator

Calculate the VRAM needed to fine-tune an LLM - full, LoRA or QLoRA - counting gradients, optimizer states and activations. Compare methods, check GPU fit.

Gemini CLI Config Generator

Generate a Gemini CLI ~/.gemini/settings.json and GEMINI.md. Choose model, theme, sandbox and MCP servers, then copy the files. Free, no signup.

LLM GPU Benchmark

Test your GPU for AI in the browser. WebGPU measures real memory bandwidth and tokens/sec, then predicts how fast Llama, Qwen and Gemma will run.

LLM Inference Speed Calculator

Estimate LLM tokens per second on your GPU from memory bandwidth, model size, quantization and context. Covers RTX 4090, 5090, A100, H100, Apple Silicon.

LLM Token Counter

Estimate tokens and API cost for GPT, Claude, Gemini, Llama and open models. Check context window fit and compare prices across models instantly.

LLM VRAM Calculator

Calculate the GPU memory an LLM needs. Llama, Gemma, Qwen, DeepSeek or any Hugging Face model, at every quantization and context size, plus which GPUs fit.

Local AI Chat

Chat with an LLM running entirely in your browser via WebGPU - Llama 3.2, Qwen 2.5, Phi 3.5 or your own GGUF. No signup, no API key, nothing uploaded.

MCP Config Validator

Paste an mcpServers config to validate it. Checks the transport shape, catches common mistakes and flags hard-coded secrets. Free, runs in your browser.

MCP Server Config Generator

Generate paste-ready MCP server configuration for Claude Code, Claude Desktop, VS Code, Cursor, and Codex CLI. Supports stdio and remote HTTP transports.

MCP Server Security Checklist

A practical security scorecard for evaluating an MCP server: source trust, least privilege, secrets, OAuth, version pinning, egress, and monitoring.

Neural Network Playground

Build a neural network, train it in your browser with live loss curves, test its predictions, and export the equivalent Keras Python code. No install.

Oh My Pi Config Generator

Generate Oh My Pi models.yml and settings.yml: define a custom provider and route the default, smol, plan and commit roles to different models. Free.

Ollama Config Generator

Build an Ollama Modelfile and server config: FROM, num_ctx, temperature, SYSTEM, flash attention and KV cache, plus OpenAI-compatible env vars.

Private AI Summarizer

Summarize any text with an AI model that runs in your browser. Articles, contracts, meeting notes - free, and your text never leaves your device.

Qwen Code Config Generator

Generate a Qwen Code ~/.qwen/settings.json for Model Studio, OpenRouter or a local endpoint, with the right region base URL so you stop hitting 401s. Free.

Self-Hosted LLM Cost Calculator

Compare self-hosting an LLM against GPT, Claude and Gemini API pricing. Break-even timelines and capacity checks for owned GPUs or rented cloud compute.

User Agent Parser, Analyzer & Builder

Decode any user agent string, see every signal your own browser leaks, and build custom UA strings for Chrome, Safari, Android, curl and Googlebot.

What LLM Can I Run?

See which LLMs your computer can run. One-click GPU detection checks Llama, Gemma, Qwen, DeepSeek and 50+ models against your VRAM, with speed estimates.

Which Agent Protocol Do You Need?

Answer a few questions and get the right agent protocol — MCP, A2A, function calling, or ACP — with what it is for and who built it.

Formatters & validators9

CSS Formatter & Beautifier

Free CSS formatter and beautifier. Pretty-print CSS with one declaration per line, or minify to remove whitespace and comments. Handles @media. No upload.

HTML Formatter & Beautifier

Free HTML formatter and beautifier. Pretty-print and indent HTML, or minify to remove whitespace and comments. Quote-aware, handles void tags. No upload.

JavaScript Formatter

Free online JavaScript formatter and beautifier. Paste minified or messy JS to instantly format it with 2-space, 4-space, or tab indentation. Client-side.

JavaScript Minifier

Free online JavaScript minifier. Compress and shrink JS with Terser to cut file size, strip comments, and speed up page loads. See byte savings instantly.

JSON Formatter

Free JSON formatter and validator. Pretty-print, minify, and validate JSON with syntax highlighting and detailed error messages.

JSON Validator & Formatter

Validate and format JSON with detailed error messages, tree visualization, and syntax highlighting. Fix JSON errors instantly. Free online tool.

SQL Formatter & Beautifier

Format and beautify SQL queries online free. Choose your dialect, indentation and keyword case, or minify. Runs in your browser - queries never uploaded.

XML Formatter

Free online XML formatter. Pretty-print and indent messy XML, minify it, and check it is well-formed — instantly and privately in your browser.

YAML Formatter & Validator

Free YAML formatter and validator. Check YAML syntax, reformat with clean indentation, and see parse errors with line and column. Runs in your browser.

Encoders, hashing & IDs5

GUID & UUID Generator

Generate UUIDs and GUIDs (v1, v4, v7) instantly. Bulk output, formatting options and one-click copy. Free, no signup, runs in your browser.

HTML Entity Encoder & Decoder

Encode text to HTML entities or decode them back. Named, decimal and hex output, four encoding levels, XSS warnings. Free and runs in your browser.

QR Code Decoder

Free QR code decoder. Upload, drag or paste a QR code image to read its contents instantly - URLs, Wi-Fi, contacts and text. 100% in your browser.

SRI Hash Generator

Free SRI hash generator. Paste a CDN URL, upload a file or paste code to get sha256, sha384 or sha512 integrity attributes and a ready-to-copy script tag.

URL Encode/Decode with Query Parser

Percent-encode and decode URLs instantly. Compare encodeURIComponent, encodeURI and form encoding, parse query strings, and catch double-encoding bugs.

PDF & documents9

Image to PDF Converter

Combine JPG, PNG, WebP or HEIC images into one PDF in your browser. Reorder pages, pick A4/Letter/fit-to-image. Nothing is uploaded. Free, no signup.

PDF Compressor

Shrink a PDF in your browser. Images are re-encoded and metadata stripped, and nothing is uploaded, so confidential documents stay on your machine.

PDF Merger

Merge multiple PDF files into one document with drag-and-drop reordering. All processing happens in your browser — no uploads to external servers.

PDF Page Remover

Remove specific pages from any PDF with visual previews. Select the pages you do not need and download a clean file — processed privately in your browser.

PDF Page Reorderer

Rearrange PDF pages with drag-and-drop and visual previews. Move pages to any position and download the reorganized PDF — all in your browser.

PDF Page Rotator

Rotate individual PDF pages by 90, 180, or 270 degrees to fix orientation. Visual previews and client-side processing keep your files private.

PDF Password Protector

Add password encryption and permission controls to PDF files. Set open passwords and restrict printing or editing — all encryption runs in your browser.

PDF Splitter

Split a PDF into individual pages or custom page ranges and extract the sections you need. All processing runs in your browser — no uploads required.

PDF to Image Converter

Convert PDF pages to high-quality PNG or JPEG images at custom DPI. Batch-convert whole documents or pick pages — processed privately in your browser.

Converters20

Book Page Size Converter

Convert between book page sizes and formats. Calculate trim sizes, margins, and spine width for self-publishing and print design.

Case Converter

Change text to UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case or kebab-case instantly, with live word and character counts.

CSV to JSON Converter

Convert CSV to JSON, JSON to CSV, and Excel to either, right in your browser. Multi-sheet .xlsx support, row and column counts, copy or download results.

Data Format Converter

Convert between JSON, YAML, XML, TOML and CSV in your browser with live validation, auto-detection and download. Free, private, no upload.

Excel to JSON Converter

Convert XLSX, XLS and XLSM workbooks to JSON in your browser. Pick the output shape, header, empty-cell and date handling, then copy or download.

HEIC to JPG Converter

Convert iPhone HEIC and HEIF photos to JPG. Batch conversion with a quality slider, processed in your browser, so no photo is ever uploaded. Free.

Hex to RGB Converter

Convert any hex color code to RGB values instantly. Understand the hex-to-RGB math and get ready-to-paste rgb() and rgba() values for your CSS.

Image Format Converter

Convert images between JPEG, PNG, WebP, GIF, BMP, ICO and PDF in your browser. Reads HEIC, AVIF, TIFF and SVG. Batch convert, resize, no uploads.

JPG to WebP Converter

Convert JPG images to WebP for 25 to 35 percent smaller files with no visible quality loss. Batch conversion runs in your browser — nothing is uploaded.

Number Base Converter

Free number base converter. Convert binary to decimal, hex to decimal, decimal to binary and more — all four bases update live in your browser.

PNG to JPG Converter

Convert PNG images to JPG with adjustable quality control. Reduce file size while preserving clarity — batch processing runs privately in your browser.

RGB to Hex Converter

Convert RGB color values to a hex code instantly. Learn the RGB-to-hex math and copy clean six-digit hex codes for your HTML and CSS.

SQL Dialect Translator

Convert SQL between MySQL, PostgreSQL, SQL Server, Oracle, SQLite, BigQuery, Redshift and Snowflake. Auto-detects the source dialect.

SVG to PNG Converter

Convert SVG vector graphics to high-quality PNG at any resolution or scale factor. Ideal for icons, logos, and web assets — processed in your browser.

Unix Epoch Time Converter - Timestamp to Date Tool

Free Unix timestamp converter. Paste any epoch time and get the date instantly in your browser — seconds, milliseconds, FILETIME, hex, batch, any timezone.

WebP to GIF Converter

Convert WebP to GIF free in your browser. Drag in a .webp file, get a GIF back in seconds. Nothing is uploaded, no signup, no watermark, files up to 50MB.

WebP to JPG Converter

Convert WebP images to universally compatible JPG while keeping quality. Batch conversion runs in your browser — nothing is ever uploaded.

WebP to PNG Converter

Convert WebP images to PNG with full transparency preserved. Lossless, batch-capable conversion that runs privately in your browser.

Windows FILETIME Converter

Free Windows FILETIME converter. Convert 64-bit FILETIME timestamps to human-readable dates and back. Supports hex, decimal, and LDAP formats.

YAML ⇄ JSON Converter

Convert YAML to JSON or JSON to YAML instantly in your browser. Upload a file, see parse errors with line numbers, then copy or download the result.

Config & file generators16

.env File Generator

Create a .env file in seconds. Pick a framework template, add variables, generate secure random secrets, and copy or download a ready-made .env example.

.gitignore Generator

Free .gitignore file generator. Combine templates for Node.js, Python, Java, React, VS Code, and more. Generate project-specific ignore patterns instantly.

ASCII Art Generator

Turn text into ASCII art with 200+ FIGlet fonts, or convert an image to ASCII with color, dithering and adjustable width. Free and 100% in your browser.

Color Palette Generator

Generate complementary, analogous, triadic and monochromatic color palettes from any base color. Free palette generator for designers and developers.

Dockerfile Generator

Generate a production-ready Dockerfile from a form: multi-stage builds, non-root user, healthcheck, ENV and labels. Templates for Python, Node, Go, Java.

Lorem Ipsum & Placeholder Image Generator

Free lorem ipsum generator: dummy text by words, sentences or paragraphs, plus placeholder image URLs at any size from Picsum, Placehold.co and more.

Markdown Table Generator

Free Markdown table generator. Build GFM tables in a visual grid, set per-column alignment, preview live, and copy clean Markdown. Runs in your browser.

Matrix Rain Generator

Create the Matrix digital rain effect online. Tune speed, glyphs, colour and trails, then export video, PNG or standalone HTML. Free, in your browser.

Mock Data Generator

Generate realistic fake test data - names, emails, addresses, Luhn-valid cards, UUIDs - and export as JSON, CSV or SQL. Seeded, in-browser, free.

package.json Generator

Generate a package.json with React, Next.js, Express, testing, Tailwind, and Prisma presets. Live JSON preview, copy or download. Free and in-browser.

Python requirements.txt Generator

Build a Python requirements.txt from presets for Django, FastAPI, Flask, data science, ML and LLM stacks. Set ==, ~= or >= pinning, then copy or download.

QR Code Generator

Create QR codes for URLs, vCards, WiFi, email, and text. Customize colors and size, download as PNG or SVG. Perfect for marketing.

Spirograph Generator

Draw spirograph and harmonograph patterns online. Adjust ratio, radii, arms, trails and damping, watch it render live, export PNG or video. Free.

Tool / Function-Schema Builder

Build an LLM tool or function definition visually and export it as an OpenAI function, an Anthropic tool, and an MCP tool. One JSON Schema, three formats.

Voronoi Diagram Generator

Generate animated Voronoi cell patterns on your GPU. Tune density, drift and borders, edit the shader live, then save a PNG, video or standalone HTML.

Webhook Payload Generator

Generate sample webhook payloads for Stripe, GitHub, Slack, Shopify and more. Sign them with an HMAC secret, add headers and POST to your endpoint. Free.

Calculators & estimators2

Rate Limit Calculator

Design safe API throttling with our rate limit calculator. Model request windows, concurrency, bursts, and queue sizing to prevent 429 errors.

Semver Calculator

Parse, compare and increment semantic versions, and test whether a version satisfies an npm range like ^1.2.3 or ~1.2.3. Same semver library npm uses.

Visualizers & playgrounds8

Double Pendulum Simulator

Watch deterministic chaos in a double pendulum solved from the real Lagrangian equations, with a ghost copy started 0.0001 radians away.

Falling Sand Game

Play a falling sand game in your browser. Draw sand, water, oil, fire, lava, acid and plants on a 200x150 grid and watch cellular automaton rules play out.

Game of Life Simulator

Run Conway's Game of Life in your browser on a wrapping grid. Glider gun, pulsar, R-pentomino and acorn presets, adjustable speed, and editable source.

Git Branch Visualizer

Paste a public GitHub repo and draw its commit graph in your browser, or compare GitFlow, GitHub Flow and trunk-based branching side by side.

JavaScript Animation Playground

Run and edit 20 JavaScript animations - galaxy particles, matrix rain, three.js bloom, CSS 3D. Change the code, see it instantly, download the HTML.

Mandelbrot Explorer

Zoom into the Mandelbrot set in real time, GPU-rendered in your browser. Adjust iterations, cycle colours, switch to Julia sets, export PNG or video.

RAID Simulator

Build virtual RAID arrays, write real text, model controller caches, inject disk failures, and simulate rebuild and RAID conversion time.

Sorting Algorithm Visualizer

Watch bubble, insertion, selection, merge and quicksort run step by step with live comparison counts. Adjust array size, data shape and speed.

Testers & inspectors6

Color Contrast Checker

Test text and background color contrast against WCAG 2.1 AA and AAA standards. See pass/fail for normal and large text and fix accessibility issues fast.

CSV Viewer

View, sort, and filter CSV data in an interactive table. Paste or upload a file and explore the rows instantly in your browser — no upload required.

File Metadata Analyzer

Extract hidden file metadata: photo EXIF and GPS, PDF properties, audio ID3 tags and Office document authors. Export CSV. Free, nothing is uploaded.

Online Diff Checker - Text, Config & File Compare

Free online diff checker. Compare two files, code or config side-by-side or unified, by line, word or character. Runs in your browser; nothing is uploaded.

Online Regex Tester & Debugger

Test and debug regex online with live match highlighting, capture-group details, plain-English explanations, and 90+ ready patterns. Free, in your browser.

Webhook Tester & Inspector

Generate a temporary webhook URL, capture incoming payloads live, and validate GitHub, Stripe, Shopify, Slack and Twilio signatures. Free, in-browser.