Free Developer Tools & Tech Guides.
Everything in One Place.

An in-browser IDE to write and run JavaScript, Python, or HTML/CSS/JS instantly, with live console output and preview — no setup, nothing installed.

Professional browser PDF Studio. Edit text inline, insert images, vector shapes, signatures, annotations, forms, reorder pages, and export vector PDFs with 100% pixel fidelity.

A full spreadsheet editor in your browser: open and edit CSV, TSV, XLSX, XLS and ODS files, write formulas, format cells, sort and filter, build charts, and export back to Excel, CSV, JSON or PDF.

Validate, format, beautify, or minify JSON data instantly with syntax error detection and clipboard copying.

Convert Markdown documents into beautifully styled, print-ready PDF files directly inside your browser.

Create custom high-resolution scannable QR codes for URLs, text, and Wi-Fi networks — or scan and instantly decode any QR code from an uploaded image or your device's camera, right in your browser.

Convert PNG/JPEG images to WebP format, resize dimensions, and compress file size right in your browser.

Encode text into Base64 format and decode Base64 strings back to plain text seamlessly.

Write Markdown code in real-time and render formatted HTML with live side-by-side preview.

Paste table data or code to format and copy styled tables, ASCII grids, or formatted code for Slack, Teams, Discord, and more.

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text input instantly in your browser.

Test and debug regular expressions with real-time matching, group highlighting, and common pattern library.

Compare two blocks of text side-by-side and instantly see additions, deletions, and changes highlighted.

Generate placeholder text in paragraphs, sentences, or words for design mockups and prototyping.

Convert text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, and kebab-case.

Calculate your exact age in years, months, days, hours, and minutes from your date of birth.

Convert Unix timestamps to human-readable dates and vice versa. Supports seconds and milliseconds.

Decode, verify, and generate JSON Web Tokens (JWT) in real-time with color-coded breakdown, claim timestamps, and HMAC SHA-256 signature verification.

Build cron expressions with a guided field-by-field editor, or paste one to decode it. Shows a plain-English schedule description and the next 5 run times.

35+ finance calculators in one tool: SIP, Lumpsum, SWP, FD, RD, PPF, EPF, EMI, home & car loan EMI, income tax, HRA, gratuity, salary, GST, NPS, retirement, and more — with interactive sliders, donut charts, and year-by-year breakdowns.

Start a call with up to 4 people, share your screen, chat, and send files — no account, no install, nothing recorded. The host approves everyone who joins.

5 PDF tools in one: merge multiple PDFs into one file, split a PDF or extract a page range, compress file size, convert PDF pages to images, and turn images into a new PDF — all 100% client-side.

4 image tools in one: convert between PNG, JPEG, and WEBP with a quality slider, crop by dragging or exact coordinates, mask a photo into a circle, and extract text from an image with OCR — all in your browser.

5 CSS generators in one tool: border-radius, box-shadow, gradients, cubic-bezier easing curves, and a WCAG contrast checker — all with live previews and one-click copy.

3 config generators in one tool: Dockerfile builder with presets for Node/Python/Go/Static/Generic, a .gitignore composer for common stacks, and an .htaccess/Nginx rules builder — all generated instantly and copyable.

4 SEO tools in one: a meta tags & OpenGraph generator with a live social-preview mockup, a robots.txt rule builder, a JSON-LD structured data generator for 5 schema types, and a UTM campaign link builder.

6 data format tools in one: CSV ↔ JSON converter, HTML table → JSON/CSV extractor, XML formatter & validator, YAML ↔ JSON converter, SQL formatter, and a Markdown table generator — all running entirely in your browser.

4 text encoding tools in one: a Base32 encoder/decoder, HTML entity encoder/decoder, JS/JSON string escaper, and a NATO phonetic alphabet converter.

2 number conversion tools in one: a number base converter (binary, octal, decimal, hexadecimal, and any custom base from 2-36) and a bidirectional Roman numeral converter.

5 security utilities in one tool: HMAC generator, RSA key pair generator, API key/secret token generator, password strength analyzer, and Luhn/card checksum validator — all computed locally in your browser via the Web Crypto API.

2 essential sysadmin utilities in one tool: an IPv4 subnet/CIDR calculator (network, broadcast, mask, usable host range) and a bidirectional Linux chmod permission calculator (checkboxes ↔ octal ↔ symbolic notation).

2 API developer utilities in one tool: a cURL-to-code converter (generates JavaScript fetch, Python requests, and Node axios from a pasted curl command) and a searchable reference of 60+ standard HTTP status codes.

2 text utilities in one tool: a list sorter & deduplicator (sort, dedupe, trim, and clean up line-based lists) and a URL slug generator (turn any title into a clean, URL-safe slug).

4 time tools in one: calculate the exact difference between two dates, check live clocks across major world cities, run a lap-tracking stopwatch, and stay focused with a Pomodoro timer.

4 everyday calculators in one: work out discounts and sales tax, split a restaurant bill with tip, estimate fuel cost for a trip, and calculate your BMI with a healthy weight range.

Compare two semantic version strings using official SemVer precedence rules to see which is greater, or bump a version's major, minor, patch, or prerelease number.

Estimate how many tokens your text will use in an LLM prompt, see live word and character counts, and calculate estimated API cost with an editable price-per-million-token field.

Paste any browser User-Agent string — or use your own automatically — to extract the browser name and version, operating system, device type, and rendering engine.

Find your public IPv4 and IPv6 addresses with approximate location and ISP plotted on an OpenStreetMap, and inspect your browser, OS, screen, and device details — two essential lookup tools in one.

Scan your Rubik's cube with your camera or pick the colour of every sticker by hand, then watch a 3D animated cube walk you through the solution one move at a time.

Send files directly between browsers over a peer-to-peer WebRTC connection — no upload, no server storage, no signup. Share a code, connect, and transfer files of any size instantly.

In-browser ASCII art text generator. Convert standard text into multi-line block letter ASCII banners with custom border frames (Code comments /* ... */, Hash #, Box ╔═╗) for CLI tools, terminal splash screens, and code headers.

Translate text to Morse code and back, then hear it played as real dot-dash audio — adjustable WPM speed, Farnsworth spacing, a visual keying lamp, and one-click WAV export.

Upload and analyze SQL files online. Explore database tables, records, columns, relationships and ER diagrams directly in your browser.

A fast-paced endless runner — jump glitch shards and chase a new high score. Tap, click, or press Space to jump.

A classic brain-training card-flip memory game. Clear the board in as few moves as possible.

The retro classic. Steer your snake to eat orbs and grow as long as possible without hitting a wall or yourself.

A flappy-style dodger — flap through gaps in the pipes and see how far you can get without crashing.

A Tetris-style falling-block puzzle. Rotate and stack pieces to clear full rows before the stack tops out.

A fast-paced aim trainer. Click targets as they pop up in 30 seconds — but watch out for red decoys.

The addictive sliding-tile puzzle. Merge matching numbers to reach the elusive 2048 tile.

The classic number logic puzzle with easy, medium, and hard grids — pencil marks, mistake tracking, and a timer included.

The timeless deduction game. Clear every safe square using the number clues — and never click a mine.

A Simon-style memory workout. Watch the pattern of lights and tones, then repeat it back as it grows every round.

A 60-second mental arithmetic drill. Answer as many problems as you can, build a streak, and beat your high score.

A futuristic anti-gravity racer in real 3D. Three laps of a neon hex circuit — ride the banking, hit the boost pads, and keep your shield off the walls.

A full 3D chess set with every rule of the game — castling, en passant, promotion, the lot. Play a real computer opponent, share the board with a friend, or send a room code across the world.

Draughts on a 3D board, played properly — captures are compulsory and a multi-jump runs as one sweeping move. Take on the computer, a friend beside you, or a room code.

The real board in 3D, with proper physics. Flick the striker, pot your nine coins, cover the queen — and watch out for pocketing the striker.

A full-size 3D pool table with real ball physics. Break, claim solids or stripes, clear your group and call the eight — against the computer or a friend online.

The classic race in 3D, for two to four players. Roll a six to break out, send rivals home on the way round, and get all four tokens into the middle first.

The security baseline for a public-facing Ubuntu instance — key-only SSH, a default-deny firewall, intrusion banning, unattended security upgrades, and the Docker iptables gap that silently bypasses your firewall rules.

Build a pipeline that tests, builds a tagged image, and deploys to an EC2 instance without dropping requests — using OIDC instead of long-lived AWS keys, SSM instead of SSH, and a health-gated release step that rolls itself back.

A production-shaped Docker Compose stack: multi-stage builds that keep images small, healthchecks that make dependency ordering real, named volumes that survive a rebuild, and the security defaults the tutorials leave out.