All Free Online Tools

Calculate your exact age in years, months, weeks, days, hours, and minutes. Discover your zodiac sign, generation label, birth day of the week, and countdown to your next birthday — all instantly.

Remove image backgrounds instantly with AI — powered by RMBG-1.4 neural network running 100% in your browser. Replace backgrounds with colors, gradients, blur, or custom images. Free, private, unlimited.

Create better prompts for ChatGPT, Claude, Gemini, image AI, coding assistants, marketing, studying, and business workflows.

Convert between Square Meters, Square Feet, Acres, Hectares, and 10 area units with instant results, formula display, and multi-unit reference table.

Encode and decode Base64 strings instantly online. Convert text to Base64, decode Base64 to text with full UTF-8 and emoji support. Free and fast.

Calculate your Body Mass Index with a visual gradient scale, healthy weight range for your height, weight-to-target guidance, and detailed health category breakdown — in Metric or Imperial units.

Generate clean, convention-compliant git branch names from task descriptions, JIRA tickets, or any text input. Supports 12 prefix types, 4 naming conventions, and auto-detects ticket IDs.

Convert text between 12 case formats: UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, kebab-case, PascalCase, CONSTANT_CASE, dot.case, path/case, and Inverse Case — with live preview and text stats.

Beautify or minify JSON, JavaScript, CSS, and HTML code online for free. Instant code formatter, beautifier, and minifier with syntax highlighting.

Check foreground and background color contrast for WCAG AA and AAA, with live preview, CSS output, and readable results.

Generate beautiful color palettes, check WCAG contrast, simulate color blindness, and extract colors from images — free online color scheme generator.

Free online PDF compressor with image recompression, metadata removal, and adjustable quality slider. 100% client-side — your files never leave your device.

Create a polished, role-specific cover letter with tone controls, job keywords, achievements, copy, and download.

Generate SSL/TLS certificate signing requests and private keys locally in your browser with SAN validation, RSA/ECDSA keys, and OpenSSL command previews.

Convert CSV to JSON and JSON to CSV with quoted-field parsing, nested object flattening, delimiter controls, copy, and download.

Free online currency converter with live ECB exchange rates. Convert USD to INR, EUR, GBP, JPY and 30+ currencies instantly. Compare up to 10 currencies simultaneously with real-time rates.

Convert between Bytes, KB, MB, GB, TB, PB, and binary units (KiB, MiB, GiB, TiB) with instant results and formula display.

Free online diff checker & code comparison tool. Compare text, code, JSON, XML, and more with syntax highlighting, side-by-side view, and detailed diff statistics. 100% client-side.

Generate favicon PNGs, Apple touch icons, Android icons, manifest JSON, HTML tags, previews, and a ZIP download.

Free online image compressor with quality slider, target size mode, format conversion (JPEG/PNG/WebP), batch processing, and before/after comparison. 100% client-side — your images never leave your device.

Convert images between JPG, PNG, and WebP locally with preview, quality control, background fill, and file size comparison.

Remove EXIF, GPS location, camera, timestamp, XMP, IPTC, and content credential metadata from JPG, PNG, and WebP images privately in your browser.

Resize images to exact pixel dimensions or social media sizes instantly. 27 presets for Instagram, Facebook, Twitter, YouTube, LinkedIn, and print. 100% client-side.

Convert images to PDF with custom page sizes, layouts, and quality. Combine multiple JPG, PNG, or WebP images into a single PDF. Drag to reorder pages. 100% client-side.

Create professional invoices with line items, tax, discounts, currency selection, notes, preview, and print-to-PDF export.

Free online JSON formatter, validator, and beautifier with tree view, auto-repair, TypeScript generator, and statistics dashboard. 100% client-side.

Free online JWT decoder and parser. Decode JSON Web Tokens instantly, inspect headers, payloads, and claims with color-coded visualization, token timeline, security warnings, and claim-level copy — all 100% client-side.

Convert between Meters, Feet, Inches, Miles, Kilometers, Yards, and 12 length units with instant results, formula display, and multi-unit reference table.

Free online Markdown editor with live preview, syntax-highlighted code blocks, formatting toolbar, rich text copy, and export to HTML & MD. 100% client-side.

Free online PDF merger with drag-to-reorder, page count preview, and instant merging. 100% client-side — your files never leave your device.

Generate SEO title, description, canonical, Open Graph, and Twitter Card tags with live search and social previews.

Estimate OpenAI API token spend for GPT-5.5, GPT-5.4, and GPT-5.4 mini with cached input support and batch discount simulation.

Generate cryptographically secure random passwords with a visual strength meter, crack-time estimate, entropy calculation, and one-click presets for PINs, passphrases, and maximum-security keys.

Check password strength locally with entropy, crack-time estimates, pattern warnings, suggestions, and a strong password generator.

Reorder, rotate, delete, and clean PDF pages in your browser with thumbnail previews, blank-page detection, and private export.

Convert PDF pages into high-quality JPG images in your browser with quality control, render scaling, previews, and ZIP download.

Three instant percentage calculators in one: find X% of a number, calculate what percent X is of Y, and compute percentage change between two values — with formula display, quick presets, and copy-to-clipboard.

Create beautiful, branded QR codes with custom colors, dot styles, logo embedding, and multiple content types — URL, Wi-Fi, vCard, email, SMS. Export as PNG or SVG, 100% free, no sign-up.

Build, test, and debug regular expressions with real-time match highlighting, a token-by-token pattern explainer, 30+ ready-to-use templates, find & replace, and code generation in JavaScript, Python, Go, and PHP.

Build a clean ATS-friendly resume with keyword scoring, impact bullets, preview, copy, and print-to-PDF export.

Create robots.txt crawl rules with presets, custom disallow paths, sitemap directives, crawl delay, and AI crawler controls.

Convert between km/h, mph, m/s, knots, Mach, and the speed of light with instant results and formula display.

Free online PDF splitter with 4 split modes — custom page ranges, every N pages, equal parts, or extract each page. ZIP download, 100% client-side.

Convert SVG code or files to transparent PNG images with custom width, height, preview, and local browser rendering.

Convert accurately between Celsius, Fahrenheit, Kelvin, and Rankine with instant results, conversion formula display, and visual temperature scale.

Listen to text with browser voices, adjustable rate, pitch, volume, pause, resume, word estimates, audio download, and private local playback.

Convert meeting times across global time zones with DST-aware offsets, working-hour hints, 12/24 hour formats, and summaries.

Convert Unix epoch seconds or milliseconds to readable dates, convert dates back to timestamps, and batch-convert values.

Encode URI components, encode full URLs, decode escaped URL strings, parse query parameters, and batch-process lines locally.

Build clean campaign tracking URLs with UTM source, medium, campaign, term, content, validation, and copy-ready output.

Convert between Liters, Gallons, Cups, Fluid Ounces, and 12 volume units with instant results, formula display, and multi-unit reference table.

Convert instantly between Kilograms, Pounds, Ounces, Grams, Stone, Carats, and 12 weight units with real-time results, formula display, and multi-unit reference table.

Count words, characters, sentences, paragraphs, and reading time in real time. Set writing goals with progress tracking, analyze keyword density, and check readability — all instantly in your browser.

Download public YouTube video thumbnails in HD, SD, HQ, medium, and default sizes from a URL, Shorts link, embed link, or video ID.