Free Online Tools
PDF, Image, and Developer tools running entirely in your browser.
46 tools
Popular Tools
Merge PDF
Combine multiple PDF files into one unified document. All processing happens in your browser.
Free Online Image Compression Tool
Fast, secure, and efficient image compression. Supports JPG, PNG, and WebP formats with compression rates up to 80%.
JSON Formatter
Validate, format, and minify JSON in your browser, with tree and properties views.
Developer Tools
JSON Formatter
Validate, format, and minify JSON in your browser, with tree and properties views.
Regex Tester
Test regular expressions with custom flags and inspect matches and capture groups in real time.
Encoding & Crypto Toolkit
Hash, encrypt, and encode data right in your browser — MD5, SHA, AES-256-GCM, Unicode escaping, and HMAC. Base64 has its own dedicated tool.
Markdown Editor
Write Markdown with real-time preview, Mermaid diagrams, synchronized TOC, and export to .md / .docx / .pdf.
Date Format Converter
Enter any date — Unix timestamp, ISO 8601, common strings, RFC, or database formats — and instantly see conversions across all formats.
Text Diff
Compare two texts side by side with line numbers and inline highlights, with options to ignore line ending and control character differences.
UUID / GUID Generator
Generate UUIDs (Universally Unique Identifiers) in multiple versions and formats. All generation happens locally in your browser.
JWT Decoder
Decode and inspect JSON Web Tokens — header, payload, claims, and expiry — entirely in your browser. Nothing is sent to any server.
Password Generator
Generate strong, random passwords with customizable length and character sets.
Snowflake ID Generator
Generate Twitter-style 64-bit Snowflake IDs with configurable epoch and worker ID. Batch generation supported.
OpenSSL rand — Secure Random Generator
Generate cryptographically secure random strings using the browser's CSPRNG (equivalent to `openssl rand`). Supports hex, base64, passwords and more.
Unit Converter
Convert between common units of length, weight, temperature, and data storage.
ASCII Art Generator
Convert text to ASCII art banners (200+ figlet fonts) or turn images into ASCII character art. All processing happens in your browser.
Chinese Converter
Convert Chinese text between Simplified, Standard Traditional, Hong Kong Cantonese and Taiwan Traditional.
MQTT Client Online — Test MQTT over WebSocket
Free online MQTT client that runs entirely in your browser. Connect to any MQTT broker over WebSocket (ws:// or wss://), subscribe to topics, publish messages and inspect traffic in real time — no installation required.
Scientific Calculator
Free online calculator with Standard, Scientific and Programmer modes. Arithmetic with parentheses and percent, trigonometry, powers, roots, logarithms and factorials, plus BIN/OCT/DEC/HEX conversion and bitwise operations with 8–64 bit signed or unsigned integers. All calculations run locally in your browser.
Image Tools
Free Online Image Compression Tool
Fast, secure, and efficient image compression. Supports JPG, PNG, and WebP formats with compression rates up to 80%.
Image Resizer
Resize PNG/JPG images to exact pixel dimensions right in your browser.
Free Online Image Cropper
Crop, rotate, and flip images in your browser. Supports PNG, JPG, and WebP formats.
Image Converter
Convert PNG/JPG/WebP images and adjust quality in your browser.
QR Code Generator
Generate QR codes from text or URLs with custom dot styles, finder patterns, colors, gradients, embedded logo and text, then download as PNG.
Color Converter
Convert colors between HEX, RGB, RGBA, HSL and CMYK with live preview, and browse standard web colors.
Image ↔ Base64
Convert images to Base64 strings or decode Base64 back to images.
Favicon Generator
Convert PNG, JPEG, GIF, BMP and more to a multi-resolution ICO favicon. Choose icon sizes and 8-bit or 32-bit color depth.
App Icon Generator
Design an app icon with Material Symbols clipart, text or your own image, then download production-ready Android, iOS and Web icon packs.
SVG to PNG
Render SVG files or code to PNG images at any size using canvas.
Remove Watermark from Image Online Free
Paint over watermarks, logos, or date stamps and erase them with local inpainting. Supports PNG, JPG, and WebP — images never leave your browser.
PDF Tools
Merge PDF
Combine multiple PDF files into one unified document. All processing happens in your browser.
Split PDF
Split a PDF into multiple files by page range or every N pages. All processing happens in your browser.
Compress PDF
Reduce PDF file size by re-encoding images as JPEG and removing metadata. All processing happens in your browser.
PDF to Image
Convert PDF pages to PNG or JPEG images in your browser. Render all pages and download them as a ZIP archive or individually.
Image to PDF
Combine JPG, PNG and WebP images into a single PDF. Drag to reorder, choose page size and orientation. All processing happens in your browser.
Rotate PDF
Rotate all or selected pages of a PDF by 90°, 180° or 270°. All processing happens in your browser.
Delete PDF Pages
Select pages to remove from a PDF by checking their thumbnails. All processing happens in your browser.
Reorder PDF Pages
Change the order of pages in a PDF by dragging thumbnails or using arrow buttons. All processing happens in your browser.
SEO Tools
Meta Tag Generator
Generate SEO-friendly meta tags for your web pages in real time. Copy the HTML snippet and paste it into the head section of your HTML.
XML Sitemap Generator
Turn a list of URLs into a search-engine-friendly XML sitemap. Download the file and submit it to Google or Bing.
Robots.txt Generator
Create a robots.txt file to guide search engine crawlers. Define allowed and disallowed paths, crawl delay, and sitemap location.
PageSpeed Insights Test
Analyze any URL with Google PageSpeed Insights directly in your browser. See desktop and mobile performance scores plus Core Web Vitals.
Puzzle Tools
Sudoku
Play free online Sudoku in your browser: classic 9×9, plus 6×6 and 4×4 mini boards for kids and beginners. Multiple difficulty levels with guaranteed unique solutions — no guessing ever needed. Notes, conflict highlighting, undo, hints, timer, quick input, and PNG/PDF printing.
24 Point Game
Free online 24 point game: draw 4 playing cards and make 24 with addition, subtraction, multiplication and division. A counts as 1, J/Q/K count as 10. Every deal is guaranteed solvable, with hints, solutions, a timer and score stats.
2048
Free online 2048 game: slide the tiles and merge matching numbers to reach the target tile. Five target difficulties (128 to 2048), a timer and the site-wide rank system (Master/Pro/College/Grade School/Preschool). Play with keyboard or touch.
Memory Match
Free online memory match game: flip cards to find matching pairs and clear the board. Five board sizes (12 to 30 cards), a timer and the site-wide rank system (Master/Pro/College/Grade School/Preschool).
Schulte Grid
Free online Schulte grid attention training: tap the numbers in order from 1 to N². Five sizes (3×3 Starter to 7×7 Expert), a 0.1s timer, click-rhythm attention analysis and the site-wide rank system (Master/Pro/College/Grade School/Preschool).
Gomoku (Five in a Row)
Play classic 15×15 Gomoku against a local AI with five difficulty levels, scoring, ranks, Renju forbidden-move rules and anime-style big-move callouts.
Practical Tools
Command Cheatsheets
View all cheatsheetsGit Commands Cheat Sheet
Quick reference for the most useful Git commands: init, clone, branch, merge, rebase, reset, stash, remote operations and history inspection, with common options and practical examples.
31 commands
Git 2.30+
SVN Commands Cheat Sheet
Quick reference for Subversion (SVN) commands: checkout, update, commit, branch/tag, merge, history inspection and repository administration, with common options and practical examples.
28 commands
SVN 1.10+
Linux Shell Commands Cheat Sheet
Quick reference for everyday Linux / macOS shell commands: file operations, text processing, permissions, processes, networking, archive and storage — with common options and practical examples.
40 commands
bash 5+ / POSIX 2017
PowerShell Commands Cheat Sheet
Quick reference for PowerShell cmdlets: discovery, file/system, pipeline filtering and selection, networking, remote sessions and modules — with common parameters and practical examples.
34 commands
PowerShell 7+
Windows CMD Commands Cheat Sheet
Quick reference for the classic Windows Command Prompt (cmd.exe): file/dir operations, text search, system info, networking and batch scripting — with common options and practical examples.
40 commands
Windows cmd.exe 10+
Docker Commands Cheat Sheet
Quick reference for everyday Docker CLI commands: container lifecycle, image builds, logs / exec, networking, volumes, Compose, registry and housekeeping — with common options and practical examples.
46 commands
Docker Engine 24.0+
kubectl Cheat Sheet
Quick reference for kubectl, the Kubernetes command-line client: contexts, get/describe, apply, logs/exec, rollout, scaling and debugging — with common options and practical examples.
40 commands
kubectl 1.28+
PostgreSQL Commands Cheat Sheet
Quick reference for PostgreSQL: psql client commands, DDL/DML statements, joins/aggregates, indexes, transactions and backup/restore — with common options and practical examples.
35 commands
PostgreSQL 14+
MySQL Commands Cheat Sheet
Quick reference for MySQL / MariaDB: client commands, DDL/DML statements, joins/aggregates, indexes, transactions and backup/restore — with common options and practical examples.
38 commands
MySQL 8.0+
Redis CLI Cheat Sheet
Quick reference for redis-cli: connection & info, key/string commands, hashes, lists, sets, sorted sets, streams, pub/sub, server management, persistence & replication and diagnostics — with common options and practical examples.
42 commands
Redis 6.2+
MongoDB (mongosh) Cheat Sheet
Quick reference for mongosh: connect, CRUD, query operators, aggregation pipeline, indexes, replica sets, users and dump/restore — with the most common shell patterns and practical examples.
30 commands
MongoDB 6.0+ / mongosh 1.6+
pnpm Cheat Sheet
Quick reference for pnpm: install / add / remove / update, scripts, workspaces, store & cache and config — focused on the GitHub-site pnpm repo workflow, with options and practical examples.
31 commands
pnpm 9+
SSH & OpenSSH Cheat Sheet
Quick reference for OpenSSH: connections, key management, the user config file, file transfer (scp/rsync/sshfs), port forwarding and jump hosts — with common options and practical examples.
26 commands
OpenSSH 9.0+
curl Cheat Sheet
Quick reference for curl: HTTP verbs, headers, authentication, JSON, forms, uploads, downloads, redirects, debugging, retries, and connection controls — with common options and practical examples.
30 commands
curl 7.88+
Vim Cheat Sheet
Quick reference for Vim / Neovim: modes, cursor motion, editing, search & replace, multi-file navigation, registers / macros and visual-block edits — with short examples for the most common moves.
37 commands
Vim 9 / Neovim 0.9+