Free — works offlineQuick
Quick
online tools
24 single-purpose tools plus 114 unit converters. Every one runs in your browser — nothing you type is uploaded or stored — and works offline once loaded.
No sign-upNo uploadWeb Crypto secure
Generators
- Password GeneratorStrong random passwords with a length and character-set you choose.
- QR Code GeneratorTurn any text or URL into a QR code and download it as a PNG.
- UUID GeneratorGenerate one or many version-4 UUIDs.
- Random Number GeneratorDraw random integers from a range, with an option for no repeats.
- Color Palette GeneratorBuild a colour palette from a base hue with copyable HEX and RGB.
- Lorem Ipsum GeneratorGenerate placeholder paragraphs, sentences or words, as plain text or HTML.
- Random PickerPick a random name from a list, shuffle it, or spin a wheel.
- Barcode GeneratorGenerate 1-D and 2-D barcodes — Code 128, EAN, UPC, QR, Data Matrix, PDF417 and more.
Text
- Word CounterLive word, character, sentence and paragraph counts plus reading time.
- Case ConverterConvert text between UPPER, lower, Title, camelCase, snake_case and more.
- Text DiffCompare two blocks of text and see line-by-line and inline character differences.
- Markdown PreviewLive GitHub-flavoured Markdown preview with copyable HTML.
Developer
- JSON FormatterPretty-print, minify and validate JSON with clear error messages.
- Base64 Encode / DecodeEncode text to Base64 and back, with full UTF-8 support.
- URL Encode / DecodePercent-encode text for URLs, or decode it back, in component or full-URL mode.
- Hash GeneratorSHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text, via Web Crypto.
- JWT DecoderDecode a JSON Web Token's header and payload, and verify the signature (HS/RS/ES/PS).
- Regex TesterTest a regular expression against text with live match highlighting and a replace preview.
- CSV ⇄ JSONConvert CSV to JSON and back, with delimiter auto-detect and quoted fields.
- Unix Timestamp ConverterConvert between Unix timestamps and human dates, in any timezone, with a live clock.
Math
Files
Unit converters
All 114 converters →- centimeters to inches
- inches to centimeters
- feet to meters
- millimeters to inches
- kilograms to pounds
- pounds to kilograms
- grams to ounces
- stone to pounds
- Celsius to Fahrenheit
- Fahrenheit to Celsius
- Celsius to Kelvin
- miles per hour to kilometers per hour
- kilometers per hour to miles per hour
- liters to US gallons
- milliliters to US fluid ounces
- US cups to milliliters
- tablespoons to teaspoons
- megabytes to gigabytes
- gigabytes to megabytes
- kilobytes to megabytes
- gibibytes to gigabytes
- minutes to seconds
- hours to minutes
- days to hours
Why browser-based tools
A tool that runs on your device instead of a server has three practical advantages: it is private (your text, passwords, and JSON never leave the page), it is fast (no round trip), and it keeps working offline. That is why every tool here is client-side, including the ones that generate cryptographic values — they use the browser's built-in Web Crypto API.
Missing something? The suggest a tool page takes requests.
Frequently asked questions
Do these tools work without an internet connection?
Yes, once the page has loaded. Every tool runs entirely in your browser using JavaScript — there is no server call — so you can go offline and keep using it. Nothing you type is uploaded, logged, or stored.
Is there a sign-up, paywall, or ad wall?
No account, no payment, no email. The tools are free to use as often as you like.
Can I share a result?
Most tools mirror your inputs into the page URL as you use them, so you can copy the link (or use the 'Copy link to this result' button) and reopen the same result on another device.
Are the generated passwords and UUIDs actually secure?
Yes. Both use the browser's cryptographic random source (Web Crypto), the same primitive password managers and libraries rely on, entirely on your device.