Tool Studio43 tools in this category
Test your internet connection speed instantly — ping, download, and upload, all measured live in your browser. No app install, no sign-up. Free, unlimited use.
Generate professional QR codes with smart auto-detection and formatting. Automatically recognizes content type (URL, phone, email, WhatsApp, SMS, WiFi) and formats it optimally for maximum scanning compatibility. Features intelligent type detection, customizable sizes (128px to 1024px), real-time preview, format toggle, and high-quality PNG download. Perfect for business cards, marketing materials, contact sharing, WiFi access, event tickets, and digital payments. 100% client-side processing ensures complete privacy.
Convert Unix epoch timestamps to human-readable dates and back. Live current-timestamp ticker, auto-detects seconds vs milliseconds, outputs ISO 8601, UTC, local time, and relative ("2 hours ago") formats. Perfect for debugging logs, APIs, and databases.
Test if every key on your keyboard works. Press any key and watch it light up on the on-screen layout — spot stuck, dead, or unresponsive keys instantly. Free, works entirely in your browser.
Pick any color from your screen, an uploaded image, or a swatch, and get instant HEX, RGB, and HSL values. Uses the browser's native EyeDropper API where available. All processing happens in your browser.
Instantly see your public IP address. Detects IPv4 or IPv6, one-click copy. Free, no sign-up, no tracking beyond what your connection already reveals.
Generate strong, random passwords instantly. Adjustable length and character sets (uppercase, lowercase, numbers, symbols), live strength indicator, one-click copy. All generation happens in your browser using the Web Crypto API — passwords are never sent anywhere.
Comprehensive text processing tool: count characters, words, lines, sentences, and paragraphs; convert case across 7 styles (UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, kebab-case); find & replace with case-sensitive and whole-word matching plus a live match counter; and remove extra spaces. Copy or download the result. All processing done locally in your browser — nothing is uploaded.
Generate random UUID v4 identifiers instantly, one or in bulk (up to 100 at once). Copy individually or all at once. Perfect for database keys, API testing, and unique identifiers in code. 100% client-side using crypto.randomUUID().
Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text or files instantly. Perfect for verifying file integrity, checksums, and debugging. All hashing happens in your browser using the Web Crypto API — nothing is uploaded.
Resize images to exact pixel dimensions or by percentage, with an aspect-ratio lock. Convert to PNG or JPEG. Preview before/after size and dimensions. All processing happens in your browser — images never leave your device.
Search up to 5 words or phrases simultaneously with color-coded highlighting, occurrence counters, and easy navigation — no browser extension to install. Warns you if two search boxes have the same term, and when two terms' matches overlap, the earlier one wins so highlighting never looks broken. Perfect for analyzing documents, finding patterns in large texts, and reviewing content with multiple search terms at once.
Crop and resize images to specific aspect ratios with an interactive drag-and-drop crop box. Choose from preset ratios like 16:9, 4:3, 1:1, or create custom ratios. Perfect for social media posts, profile pictures, banners, and any content requiring specific dimensions. All processing happens in your browser.
Generate every standard favicon size from one image — 16×16 up to 512×512, plus Apple touch icon and Android/PWA sizes — along with a ready-to-use web manifest. All processing happens in your browser.
Convert between length, weight, temperature, speed, and scientific units instantly — from millimeters to light-years, and moles to atoms. Free, works entirely in your browser.
Interactive sorting algorithm visualizer to watch and learn how different sorting algorithms work in real-time. Visualize Bubble Sort, Selection Sort, Insertion Sort, Merge Sort, Quick Sort, and Heap Sort with step-by-step animations. Perfect for computer science students, developers preparing for interviews, and anyone learning data structures and algorithms. Features 6 different sorting algorithms with live visualizations, adjustable speed control from very slow to very fast, variable array size from 10 to 150 elements, real-time statistics showing comparisons and swaps, color-coded visualization with different colors for comparing (yellow), swapping (red), pivot (orange), and sorted (green) elements, live timer tracking execution time, responsive design that works on desktop, tablet, and mobile, dark and light theme support, and educational complexity information for each algorithm showing best, average, worst, and space complexity. Watch every comparison and swap as it happens with smooth animations. Generate new random arrays instantly. Stop and restart sorting at any time. Learn algorithm efficiency by comparing different sorting methods on the same data. Understand time complexity differences between O(n²) and O(n log n) algorithms visually. See how divide-and-conquer algorithms like Merge Sort and Quick Sort partition and solve sub-problems. Observe the heap building process in Heap Sort. All processing happens entirely in your browser with no data sent to servers. Perfect for visual learners, interview preparation, classroom teaching, algorithm comparison, and self-paced education.
Crop a photo to exact passport/visa photo dimensions for India, USA, UK, Schengen, Canada, China, and Australia. Interactive drag-and-drop crop box, precise pixel output at 300 DPI print quality. All processing happens in your browser.
Look up A, AAAA, CNAME, MX, TXT, NS, CAA, SOA, SRV, and PTR DNS records for any domain — or run a reverse DNS lookup by entering an IP address instead. Queries a public DNS-over-HTTPS resolver directly from your browser — no data is sent to our servers.
Convert numbers between binary, octal, decimal, and hexadecimal instantly. Type in any field and the others update live. Uses arbitrary-precision math, so very large numbers stay accurate. All processing happens in your browser.
Test if your mouse buttons, scroll wheel, and double-click all work correctly. Press left, middle, or right click and watch it register, and measure your double-click speed. Free, works entirely in your browser.
Calculate the exact number of days, weeks, months, and years between two dates, with an optional business-days-only count. All calculation happens in your browser.
Cut a video down to just the part you need. Pick a start and end point and download the trimmed clip. Files are processed securely and deleted automatically after conversion.
Combine multiple videos into one, even if they have different resolutions. Upload videos, reorder them, and download a single merged file. Files are processed securely and deleted automatically after conversion.
Generate placeholder Lorem Ipsum text by paragraphs, sentences, or words. Copy or download instantly. All generation happens in your browser.
See your screen resolution, browser viewport size, device pixel ratio, and estimated DPI, live. Free, works entirely in your browser.
See your browser name and version, rendering engine, operating system, and full user-agent string, along with language, viewport, and cookie settings. Free, works entirely in your browser.
Measure your browser's live frames-per-second and get an estimate of your monitor's refresh rate. Free, works entirely in your browser.
Cut and trim audio, MP3 and songs online - keep the part you want or cut a part out of the middle. Make a ringtone for iPhone or Android. Free, 100% in your browser.
Speed up or slow down songs, music and audio from 0.25x to 4x, with or without changing the pitch. Free, 100% in your browser.
Make MP3s, songs and audio files louder or quieter, or even out their loudness — with a built-in limiter so a boost does not clip. Free, 100% in your browser.
Merge audio files, songs and music into one track — join MP3, WAV, M4A, OGG and FLAC in any order with no gap, and trim each clip first. Free, 100% in your browser.
Create a UPI payment QR code from your UPI ID — open or fixed amount, note and logo — and download PNG, SVG or a print-ready Scan & Pay poster. Free, 100% in your browser.
Upload a CSV or TSV file and get instant column statistics, a data quality score, correlation analysis, auto-generated insights, and both recommended and custom charts. Free, 100% client-side.
Fill a transparent image with white, black, or any custom background color, or drag it onto another photo and position it interactively. 100% client-side.
Upload a photo and extract its dominant colors as a ready-to-use palette — each color shown as HEX, RGB, its nearest color name, and roughly what percentage of the image it covers. Free, 100% client-side.
Paste a curl command and get a working ApiClient class in JavaScript (fetch or axios), Python (requests or the stdlib http.client), PHP (cURL or Guzzle), Go, Java, or C# — headers, body, and Basic auth all mapped correctly. Free, works entirely in your browser.
Build, test, and understand cron expressions — a plain-English description, the next 10 run times, and one-click presets. Supports both standard 5-field cron and 6-field Quartz syntax (with seconds). Free, works entirely in your browser.
Paste raw Protocol Buffers (protobuf) bytes as base64 or hex and see every field decoded — no .proto schema needed. Shows every plausible interpretation of each field, since the wire format alone can't say which one is correct.
Paste JSON and generate class or struct definitions in TypeScript, Java, Go, Python, C#, Kotlin, or C++ — with explicit control over field and class naming convention, and real nested-class generation. Free, works entirely in your browser.
Paste a Base64 string or data URI and get back a real, previewable, downloadable PDF file. Free, works entirely in your browser.
Convert a PDF file to a Base64 string, ready to embed in HTML, CSS, JSON, or an API payload. Free, works entirely in your browser.
Cycle your screen through full-screen white, black, red, green, blue, cyan, magenta, and yellow to spot dead or stuck pixels and check for backlight bleed. Free, works entirely in your browser.
Test your click speed (CPS) and double-click speed. Pick a duration, click as fast as you can, and see your live clicks-per-second. Free, works entirely in your browser.