A simple online countdown timer.
Pick a random item from a list.
Generate a QR code from text or a URL.
Estimate growth from compound interest and regular contributions.
Calculate body mass index from metric or imperial measurements.
Format, validate and minify JSON.
A simple online stopwatch with laps.
A focus timer using the Pomodoro technique.
Compare local times and UTC offsets between time zones.
Calculate the number of years, months and days between two dates.
Calculate percentages quickly.
Convert currencies using the latest available reference rates.
Estimate dog and cat ages in equivalent human years.
Generate a random number in a range.
Roll virtual dice, D4 to D100.
Generate strong, random passwords.
Count characters, words, and lines.
Convert text between cases.
Remove empty lines, duplicates, sort or reverse a list.
Convert text into a URL-friendly slug.
Compare two texts line by line.
Preview Markdown rendered as HTML live.
Generate random UUIDs.
Convert between Unix timestamps and dates.
Encode and decode Base64 text.
Encode and decode URL text and query values.
Generate SHA-256, SHA-384 and SHA-512 hashes.
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.
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.
Look up common DNS records for a domain name.
Calculate image and video aspect ratios.
Convert colors between HEX, RGB, HSL and more.
Check WCAG color contrast between two colors.
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.
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.
Turn multiple images into a downloadable animated GIF.
Merge, split and convert images to PDF in your browser.
Design Drifter