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Developer Tools
Developer Tools
Generators and formatters. Everything runs in the browser.
22 live
22 in this section
#41
QR Code Generator
QR codes as PNG or SVG, generated entirely in the browser.
Open
#42
Password Generator
Strong passwords from the browser cryptographic random source.
Open
#43
JSON Formatter
Validate, pretty print, minify and sort keys. Client-side only.
Open
#44
Base64 Encoder / Decoder
Encode and decode, standard and URL-safe. Client-side only.
Open
#45
Barcode Generator
EAN-13, UPC-A, Code 128 and Code 39, with the check digit computed.
Open
#46
JWT Generator
Sign a JSON Web Token with HS256. The payload is readable.
Open
#47
Secret Key Generator
Random keys in hex, base64 or UUID, entropy stated in bits.
Open
#48
Text Comparison
Compare two texts and name the differences you cannot see.
Open
#60
Hash Generator
SHA-256, SHA-384, SHA-512 and HMAC, computed in your browser.
Open
#61
Password Strength Estimator
How cheaply a password could be guessed, and why.
Open
#62
Passphrase Generator
Memorable passphrases in English or Filipino, entropy stated honestly.
Open
#63
JSON ⇄ CSV Converter
Convert between JSON and CSV, quoting and numbers handled properly.
Open
#64
JSON Diff
Compare two JSON documents by structure, not by line.
Open
#65
XML & HTML Formatter
Indent or minify markup, without touching what must not move.
Open
#66
SQL Formatter
Lay out a query to be read, without rewriting what is in quotes.
Open
#67
CSS Minifier
Shrink a stylesheet without changing what it selects.
Open
#68
Unix Timestamp Converter
Seconds or milliseconds, both readings shown, never guessed silently.
Open
#69
Cron Expression Explainer
What a cron schedule really means, and the next five times it fires.
Open
#70
Colour Converter
HEX, RGB and HSL, with the WCAG contrast ratio attached.
Open
#71
Unicode & Encoding Inspector
Every character, every length, and the invisible ones that break things.
Open
#72
HTTP Status Codes
Every status code, and which of the confusable pair to use.
Open
#73
MIME Type Lookup
The type to serve for a file extension, and back again.
Open
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