Region DEV · 36 tools
Developer tools
JSON, encoding, regex, hashing, and other developer tools
JSON Formatter
Pretty-print and minify JSON, and pinpoint where syntax errors are.
UUID Generator
Generate up to 500 UUID v4 or v7 values at once and copy them instantly.
Image ↔ Base64
Convert images to data URIs (Base64), or turn Base64 back into a picture.
Developer Encoding Toolbox
Base64, URL, JWT, ULID/TSID, hashes, and Unix time — all on one screen.
Cron Expression Parser
Turn a cron expression into a plain-English description and its next run times.
.env ↔ JSON Converter
Convert between environment variable files and JSON, keeping quoted and multi-line values intact.
JSON ↔ YAML Converter
Convert between JSON and YAML, with optional key sorting.
Number Base Converter
See binary, octal, decimal, and hex at a glance, and convert to any base from 2 to 36.
Certificate Decoder
Read an X.509 certificate's subject, issuer, validity, SANs, and fingerprints.
GZip Compress/Decompress
Compress text with gzip into Base64, or decompress it back.
HTML Entity Converter
Convert special characters to HTML entities and back.
JWT Encoder & Verifier
Sign and create JWTs, and check a token's signature and expiry.
SQL Formatter
Format SQL queries with line breaks and indentation for your database dialect.
XML Formatter
Indent XML so it's easy to read, or minify it onto one line.
Hash & Checksum Generator
Calculate MD5 and SHA hashes of text and files, and compare them with an expected value.
JSONPath Tester
Pick values out of a JSON document with a JSONPath expression and see the matches instantly.
Regex Tester
Tweak a pattern and flags and instantly see the matches and replacement result.
XPath Tester
Apply an XPath expression to XML and find the matching nodes and values.
String Escape/Unescape
Escape line breaks and quotes so they can go into code, or turn escaped strings back.
CIDR & Subnet Calculator
Calculate network and broadcast addresses and the usable range from an IP and prefix, then split it further.
JSON ↔ XML·CSV Converter
Convert JSON to XML or CSV, and XML back to JSON.
Tools from other regions tagged #Developer
They live in another category, but they're handy for developer tasks too.
Base64 Encoder/Decoder
Encode text to Base64 or decode it back. Supports Unicode and URL-safe Base64.
URL Encoder/Decoder
Percent-encode URLs with special or non-English characters, or decode them into readable text.
Password Generator
Pick a length and character mix to create a strong random password and check its strength.
Unix Timestamp Converter
Convert between Unix timestamps (seconds/milliseconds) and human-readable dates.
Case Converter
Convert text to UPPER, lower, Title case, camelCase, snake_case, kebab-case, and more at once.
Text Compare
Compare two texts line by line and highlight what was added, removed, or changed.
Lorem Ipsum Generator
Generate as much Lorem Ipsum placeholder text as you need for designs and mockups.
Color Code Converter
Convert between HEX, RGB and HSL color codes and build a lightness palette.
PDF to HTML
Extract each page's text into an HTML document you can view on the web.
PDF to JSON
Export per-page text and document metadata as JSON.
Image Diff
Compare two images pixel by pixel, highlight what changed and calculate the ratio.
Color Blindness Simulator
See how an image looks to people with red, green or blue color blindness.
Markdown Preview
Write Markdown and see the formatted result right next to it.
CSV · XLSX · JSON Converter
Preview table data and convert between CSV, XLSX and JSON.
Password Strength Checker
Analyze a password's strength and estimated crack time, and see its weak spots.