Popular Tools

Visually design load balancer architectures and generate Nginx, HAProxy, and Caddy configuration files.

Validate, format, and minify JSON data instantly.

Escape and unescape JSON strings for embedding in code.

Convert JSON objects to URL-encoded query parameters.

Create stunning images with text, stickers, and filters. No watermark!

Convert HEX, RGB, HSL and generate palettes.

Create beautiful CSS gradients with live preview.

Check color contrast for WCAG accessibility.

Calculate purchasing power and the real value of money over time using historical CPI data. See how inflation affects your savings.

Calculate monthly loan payments, total interest, and amortization schedules for personal loans, mortgages, and auto loans.

Create professional invoices online. Add line items, taxes, and download as PDF. Perfect for freelancers and small businesses.

Calculate VAT and sales tax instantly. Add or remove tax from prices, extract VAT amounts. Works with any tax rate worldwide.

Create strong, secure passwords with customizable rules.

Generate MD5, SHA-1, SHA-256 hashes from text.

Analyze password security and get improvement suggestions.

Encrypt and decrypt text using AES-256 encryption.

Convert HTML tables to JSON arrays or objects.

Transform JSON arrays into GitHub-flavored Markdown tables.

Convert PDF pages to high-quality images instantly.

Resize images by percentage or exact dimensions.

Extract text, Markdown, JSON with bounding boxes, HTML, CSV, and per-page text from any PDF — 100% in your browser. Your file never leaves the page. Powered by liteparse WebAssembly.

All-in-one PDF tool: merge, split, rotate, delete, compress, organize.

Combine multiple PDF files into one document securely.

Split PDF files into multiple documents by page selection.

Generate QR codes for URLs, text, Wi-Fi, and vCards.

Generate unique identifiers (UUID/GUID) instantly.

Generate random numbers, pick from a list, or split a group into teams. Crypto-random and fair.

Create digital signatures and handwritten-style text.

Calculate your grade point average easily.

Calculate percentages, increases, and decreases.

Fit linear, polynomial, exponential, logarithmic, power, logistic, Gaussian, or custom models to your X/Y data and get coefficients, R-squared, and a chart.

Calculate exact age in years, months, and days.

Switch text case: upper, lower, title, camelCase.

Count words, characters, sentences, and paragraphs, with readability scores and keyword density.

Generate APA, MLA, Chicago, Harvard citations.

Score tone and sentiment signals with an English keyword lexicon. No AI model.

Extract frames from videos as thumbnail images.

Extract duration, resolution, codecs, and metadata from videos.

Extract metadata, duration, and codec info from audio files.

Extract EXIF data, GPS location, and camera info from images, videos, and audio files.

Verify SSL/TLS certificates, check expiration dates, and validate chain trust.

Check HTTP security headers for web applications and get improvement recommendations.

Check if an IP is listed on Spamhaus, SpamCop, Barracuda, SORBS, and 8 more DNSBL blocklists.

Trace email routing, extract sender IPs with geolocation, and verify SPF/DKIM/DMARC authentication.

Generate the SEO meta tags, Open Graph and Twitter Card markup for your page head, with a live search preview to check the result. No signup required.

Generate valid robots.txt files for SEO with crawler rules and sitemap support.

Generate structured data markup for SEO with JSON-LD format.

Analyze keyword density and frequency in your content. Check 1-gram, 2-gram, and 3-gram phrases with density percentages. Optimize your content for SEO without over-stuffing keywords.

Create course quizzes with LaTeX formula support. Export as PDF or Word for classroom use.

Create digital flashcards for studying and memorization.

Generate printable math and educational worksheets.

Paste a word list and print a spelling worksheet: scramble, missing letters, matching, word search and tracing, with an answer key.

Boost productivity with timed work sessions.

Online timer with lap times and precision.

Set countdown timers for events, deadlines, and special occasions.

Convert times between different time zones worldwide.

Create realistic mock Twitter/X posts with likes, retweets, and custom engagement.

Create realistic mock Instagram posts with likes, comments, and custom profiles.

Create realistic mock ChatGPT conversations with custom messages and styling.

Create realistic mock WhatsApp conversations with read receipts and timestamps.