A simple online countdown timer.
A simple online stopwatch with laps.
A focus timer using the Pomodoro technique.
Pick a random item from a list.
Generate a random number in a range.
Roll virtual dice, D4 to D100.
Generate strong, random passwords.
Generate a QR code from text or a URL.
Calculate percentages quickly.
Count characters, words, and lines.
Convert text between cases.
Format, validate and minify JSON.
Generate random UUIDs.
Convert between Unix timestamps and dates.
Calculate image and video aspect ratios.
Convert colors between HEX, RGB, HSL and more.
Check WCAG color contrast between two colors.
Encode and decode Base64 text.
Encode and decode URL text and query values.
Generate SHA-256, SHA-384 and SHA-512 hashes.
Remove empty lines, duplicates, sort or reverse a list.
Convert text into a URL-friendly slug.
Calculate the number of years, months and days between two dates.
Check an image's width, height, ratio and file size.
Resize an image by pixels or percentage.
Compress an image to JPEG or WebP.
Convert an image between PNG, JPEG and WebP.
Convert between px and rem based on a base font size.
Generate a CSS clamp() value for fluid typography.
Build a CSS linear-gradient with multiple color stops.
Compare two texts line by line.
Convert between decimal and binary file size units.
Convert between a JSON array of objects and a CSV table.
Decode a JWT header and payload.
Test a regular expression against text.
Preview Markdown rendered as HTML live.
Check a page's title, description, canonical and other meta tags.
Check a page's Open Graph and Twitter Card tags.
Check a domain's robots.txt rules and declared sitemaps.
Check a sitemap.xml file and count its URLs.
Run a one-page pre-launch checklist against a public URL.