Developer tools

Encoders, formatters, regex, hashes and network maths, all in your browser.

• Password GeneratorSecurityMake a strong random password or an easy-to-type passphrase. Made on your device and never saved.
• Timestamp ConverterDeveloperConvert a Unix timestamp to a date and a date to a timestamp, in UTC and your own time zone.
• JSON Formatter & ValidatorDeveloperPaste JSON to check it, format it with indents, minify it or sort its keys. Errors show the line and column.
• Base64 & URL Encode / DecodeDeveloperEncode and decode Base64 and URL text, including emoji and accents, with a URL-safe option.
• Hash GeneratorDeveloperGet the MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hash of text or a file, made in your browser.
• Regex TesterDeveloperTry a regular expression on your own text, see every match and group, and preview a replacement.
• UUID GeneratorDeveloperMake random version 4 UUIDs, or time-ordered version 7 ones, one at a time or in bulk.
• CSS Gradient & Shadow GeneratorDeveloperBuild a CSS gradient or a box shadow with sliders, see it live and copy the code.
• CSV to JSON ConverterDeveloperConvert CSV to JSON and JSON to CSV in your browser, with headers, quotes and a preview table.
• HTML Entity Encoder & DecoderDeveloperEscape text for web pages and turn HTML entities like & and é back into characters.
• Data Transfer Time CalculatorComputersFind out how long a download or upload takes from the file size and your connection speed.
• Cron Expression ExplainerComputersRead a cron schedule in plain English and see its next run times.
• Color Contrast CheckerDeveloperCheck the contrast between two colors against the WCAG AA and AAA levels for text.
• Subnet CalculatorDeveloperFind the network, broadcast address, mask and host range for an IPv4 address and prefix.
• JWT DecoderDeveloperRead the header, payload and expiry of a JSON Web Token without sending it anywhere.
• Chmod Permissions CalculatorDeveloperTick read, write and execute boxes to get the chmod number and the rwx string, or the other way round.
• Screen Size and PPI CalculatorComputersWork out how sharp a screen is from its resolution and diagonal size.

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