Developer & Data
JSON, Base64, hashes, regex, UUIDs, cron expressions, colour codes and dozens of other small utilities developers reach for constantly and usually end up bookmarking one tool at a time. They're all here, together.
171 tools in this category.
JSON Formatter
Pretty-print, validate or minify JSON.
Password Generator
Create strong random passwords.
Base64 Encode
Encode text to Base64.
Base64 Decode
Decode Base64 back to text.
UUID Generator
Generate random UUIDs (v4).
Regex Tester
Test a regular expression against text.
URL Encode
Percent-encode text for URLs.
URL Decode
Decode percent-encoded URLs.
Hash Generator
SHA-1 / SHA-256 / SHA-512 of any text.
Case Converter
UPPER, lower, Title, camelCase, snake_case…
CSV to JSON
Convert CSV data into a JSON array.
JSON to CSV
Convert a JSON array into CSV.
JWT Decoder
Decode a JWT's header and payload.
Text Diff
Compare two texts line by line.
SQL Formatter
Pretty-print and indent SQL queries.
Epoch Converter
Convert Unix timestamps to/from dates.
Lorem Ipsum
Generate placeholder paragraphs.
HEX ↔ RGB
Convert colours between HEX and RGB.
Sort & Dedupe Lines
Sort, reverse, shuffle or dedupe lines.
Find & Replace
Replace text, with optional regex.
Markdown to HTML
Convert Markdown into HTML.
HTML Formatter
Beautify and indent HTML.
CSS Formatter
Beautify and indent CSS.
IP Address Lookup
See your public IP, or look up where any IP is registered.
JavaScript Formatter
Beautify and indent JavaScript.
YAML to JSON
Convert YAML into JSON.
JSON to YAML
Convert JSON into YAML.
XML Formatter
Pretty-print XML.
Slug Generator
Turn a title into a URL slug.
Remove Line Breaks
Join lines or tidy whitespace.
Cron Explainer
Turn a cron expression into plain English.
Number Base Converter
Convert between binary, octal, decimal & hex.
Meta Tag Generator
Title, description, Open Graph & Twitter tags.
robots.txt Generator
Crawler rules + sitemap line in seconds.
XML Sitemap Generator
Paste URLs, get a valid sitemap.xml.
UTM Link Builder
Tag campaign links for analytics.
JSON to TypeScript
Paste JSON, get typed interfaces.
Time Zone Converter
Dhaka time → New York time, DST-aware.
Word Frequency
Count how often each word appears.
SERP Snippet Checker
Will Google truncate your title?
JSON Schema Generator
Infer a schema from example JSON.
llms.txt Generator
Make your website legible to AI assistants.
cURL Converter
cURL → fetch, axios or Python requests.
Markdown Table Generator
CSV or Excel cells → a tidy markdown table.
SVG Optimizer
Strip editor junk & shrink SVG files safely.
Text to Hex
Encode/decode text ↔ hex bytes.
Base32 Encode/Decode
RFC 4648 Base32.
HTML Minifier
Strip comments & whitespace.
JSON String Escape
Escape/unescape for JSON.
JSON Flattener
Nested JSON → dot-key paths.
JSON to Go Struct
Generate Go structs from JSON.
JSON to Python
Generate a dataclass from JSON.
Programming Case Converter
camelCase, snake_case, kebab…
Duration Converter
Seconds ↔ '2h 30m'.
Cron Next Runs
See when a cron job fires next.
Strip HTML Tags
Get the plain text out of HTML.
Extract Numbers
Pull every number from text.
Query String Builder
JSON object → URL query string.
MAC Address Formatter
Format & validate MAC addresses.
Slug to Title
my-post → My Post.
Lines to Columns
Reflow a list into columns.
Random String Generator
Custom-charset random strings.
Reverse Word Order
Flip the order of words.
Initials Extractor
Names → initials / monograms.
Remove Line Numbers
Strip leading 1. 2. 3.
Wrap Lines
Add text around each line.
NanoID Generator
URL-safe unique IDs.
Test Card Number Generator
Luhn-valid test cards (dev).
Random IP Generator
IPv4 & IPv6 addresses.
Random Date Generator
Dates within a range.
Random MAC Generator
Locally-administered MACs.
Email Validator
Check email address format.
URL Validator
Check that URLs are well-formed.
IBAN Validator
Check bank IBAN checksums.
ISBN Validator
Check ISBN-10 & ISBN-13.
Hex Validator
Check hex values & colours.
Base64 Validator
Verify a Base64 string.
UTM Parameter Parser
Break a tracking URL apart.
User-Agent Parser
OS, browser & device from UA.
Cookie Parser
Read a cookie header.
ASCII Table Generator
Data → a plain-text table.
JSON Size Analyzer
Bytes, keys & gzip estimate.
Text Similarity Checker
How alike are two texts?
Card Number Formatter
Format & identify a card.
List Comparison Tool
Intersection, difference, union.
Domain Extractor
Pull the domain from URLs.
Syllable Counter
Estimate syllables in text.
Remove Punctuation
Strip punctuation marks.
Remove Numbers
Strip digits from text.
Keyword Density Checker
Top keywords & their %.
.gitignore Generator
Starter ignore files.
Semantic Version Compare
Which version is newer?
URL Builder
Assemble a URL with params.
JSON Diff
Compare two JSON objects.
Any Base Converter
Convert between base 2–36.
Add Thousands Separators
1234567 → 1,234,567.
Remove Thousands Separators
1,234,567 → 1234567.
List to Sentence
Lines → 'a, b and c'.
Sentence to List
'a, b and c' → lines.
Capitalize Each Line
Uppercase the first letter.
Indent / Outdent Text
Add or remove indentation.
Acronym Maker
Phrase → its acronym.
Split Text to Columns
Delimited text → columns.
Zero-Pad Numbers
1 → 0001.
Reverse Text
Reverse characters, words or lines.
Add Line Numbers
Prefix every line with its number.
Unicode Escape
Encode/decode \uXXXX escapes.
HTML Entities
Encode or decode HTML entities.
NATO Phonetic
Spell text as Alpha, Bravo, Charlie…
ROT13
Apply the classic ROT13 cipher.
Colour Converter
Convert between HEX, RGB and HSL.
Random Number Generator
Generate random numbers in a range.
Text to Binary
Convert text to and from binary.
Roman Numerals
Convert between numbers and Roman numerals.
CSV to Markdown Table
Turn CSV into a Markdown table.
TSV ↔ CSV
Convert between tab- and comma-separated.
HTML to Markdown
Convert HTML into Markdown.
URL Parser
Break a URL into its parts.
Query String
Parse or build URL query strings.
JSON to XML
Convert JSON into XML.
XML to JSON
Convert XML into JSON.
Markdown to Text
Strip Markdown formatting to plain text.
Base64URL
Encode/decode URL-safe Base64.
Current Timestamp
Get the current time in every format.
List to JSON
Turn lines into a JSON array.
Remove Blank Lines
Delete empty lines from text.
Excel Column Converter
Column letter ↔ number (A ↔ 1, AA ↔ 27).
Excel Formula Generator
Build VLOOKUP, XLOOKUP, IF, SUMIF…
Morse Code Translator
Convert text to Morse code and back.
Email & URL Extractor
Pull emails, links or phone numbers from any text.
Byte Size Converter
Convert between KB, MB, GB, MiB, GiB…
Split CSV
Break a big CSV into smaller files.
Add Prefix / Suffix to Lines
Wrap every line with text on both sides.
Filter Lines
Keep or remove lines containing a phrase.
Word Wrap
Hard-wrap text at a fixed line width.
Whitespace Cleaner
Collapse spaces, trim lines, fix tabs.
Markdown TOC Generator
Build a table of contents from headings.
Unicode Code Points
Text ↔ U+XXXX code points.
Emoji Remover
Strip all emoji from any text.
Accent Remover
Café → Cafe: strip diacritics from text.
Text Statistics
Readability, word count, reading time.
Remove Duplicate Lines
De-dupe a list, keeping order.
Word Occurrence Counter
Count how often a word appears.
Caesar Cipher
Shift-cipher encrypt & decrypt (incl. ROT13).
Vigenère Cipher
Keyword-based classic cipher.
Text to ASCII Codes
Characters ↔ their code points.
Title Case Converter
Smart Title Case, sentence case & more.
Random Name Picker
Pick winners fairly from a list.
Vowel & Consonant Counter
Count vowels, consonants, digits, spaces.
Sort Text Lines
Alphabetical, length or natural sort.
Subnet Calculator
CIDR → network, broadcast, host range.
Chmod Calculator
755 ↔ rwxr-xr-x, explained.
HTTP Status Lookup
What does 418 actually mean?
CSS Minifier
Strip comments & whitespace from CSS.
MIME Type Lookup
.pdf ↔ application/pdf, both ways.
JSON Key Sorter
Sort object keys alphabetically, deep.
Random Group Generator
Split names into fair random teams.
Luhn Checksum Validator
Validate test card numbers (for devs).
Palindrome Checker
Is it the same backwards?
IP Address Converter
Dotted IP ↔ integer, hex & binary.
Redirect Rule Generator
301/302 rules for Apache or Nginx.
Markdown Table Formatter
Align the pipes — pretty tables.
Mailto Link Generator
Email links with subject & body pre-filled.
Number to Words
1,250,034 → words, incl. lakh & crore.
CSV Transpose
Swap rows and columns in a CSV.
CSV Column Extractor
Keep only the columns you need.
CSV Duplicate Remover
Drop duplicate rows — whole row or by column.
SQL IN() List Builder
Lines → 'a', 'b', 'c' for SQL queries.
.env to JSON
Convert dotenv variables to JSON.
HTML Table to CSV
Paste table HTML, get spreadsheet-ready CSV.
CSV to HTML Table
Turn CSV data into a clean HTML table.