All tools
Search and filter the complete list of developer, data, text and file utilities. Every tool has its own page and runs locally in your browser.
173 tools
Base64 Encoder
Convert any text, including emoji and accented characters, into a Base64 string in one click.
Encoding & Decoding
Base64 Decoder
Paste a Base64 string and read the original text instantly, even when the padding is missing.
Encoding & Decoding
JSON Formatter & Beautifier
Turn a minified or messy JSON document into readable, consistently indented text, with a precise error message if the JSON is invalid.
JSON & Data
JSON Validator
Check whether a piece of text is valid JSON and locate the exact character where it goes wrong.
JSON & Data
JSON Repair
Paste almost-JSON from a log, a chat answer or a JavaScript snippet and get valid JSON back, with a clear report of every change.
JSON & Data
JWT Decoder
Paste a JWT to read its header and payload as formatted JSON, with issue, not-before and expiry times translated to real dates. Decoding is not verification.
Developer Tools
UUID Generator
Create one or thousands of universally unique identifiers in any version, formatted exactly the way your code or database expects.
Developer Tools
SHA-256 Hash Generator
Hash any text with SHA-256 and get the 256-bit digest as hex or Base64 in real time.
Hash & Checksum
Unix Timestamp Converter
Paste an epoch value or a date and get every common representation at once: seconds, milliseconds, ISO 8601, RFC 2822, local time and relative time.
Date & Time
URL Encoder
Make any text safe for a URL: spaces, accents, ampersands and emoji become %XX sequences.
Encoding & Decoding
URL Decoder
Turn %20, %3A and %C3%A9 back into readable text, and find out exactly where a malformed sequence sits.
Encoding & Decoding
Text Diff – Compare Two Texts
Paste an original and a modified text to see exactly what was added and removed, at the level of detail you choose.
Text Tools
CSV to JSON Converter
Turn CSV rows into clean JSON in one step, with typed values, custom delimiters and pretty or minified output.
JSON & Data
JSON to CSV Converter
Paste a JSON array and get a CSV file ready for Excel or Google Sheets, with nested data flattened into columns.
JSON & Data
Regex Tester
Write a pattern, paste some text and see every match highlighted, with its position and capture groups.
Developer Tools
File Hash Calculator
Drop one or more files and get every checksum you need in a single pass, without uploading anything.
Hash & Checksum
MD5 Hash Generator
Get the 128-bit MD5 digest of a text or of raw hex bytes as you type.
Hash & Checksum
CIDR Calculator
Type a network such as 192.168.1.0/24 and get every subnet detail at once: masks, host range, address counts and class.
Network Tools
File Inspector
Drop a file to see what it really is: detected type, size, checksums, header bytes and warnings when the extension lies.
File Tools
Mermaid Live Editor
A free-form Mermaid editor: type diagram-as-code and get a live rendered diagram you can export.
Markdown & Diagrams
Password Generator
Create strong, truly random passwords with the character sets you choose. Nothing is sent or saved.
Developer Tools
Word Counter
Paste an essay, article or caption and get words, characters, sentences, paragraphs, reading time and the most used words instantly.
Text Tools
YAML to JSON Converter
Turn YAML into strict JSON, resolving anchors, aliases and merge keys along the way.
JSON & Data
JSON to YAML Converter
Turn JSON into readable block-style YAML, with strings quoted only when necessary.
JSON & Data
URL Parser
Paste a URL and see every component separately, with the query parameters decoded in a table.
Developer Tools
UUID v4 Generator
Get random version 4 UUIDs, the everyday choice for unique IDs when you do not need ordering or repeatability.
Developer Tools
XML to JSON Converter
Turn an XML document into JSON, keeping attributes, repeated elements and text content in a predictable structure.
JSON & Data
JSON to XML Converter
Turn a JSON document into well-formed XML with control over the root element, attributes and formatting.
JSON & Data
Base Converter (Base 2 to 36)
Type a number, pick its base and the base you want, and get an exact result with a quick view in binary, octal, decimal, hexadecimal and base 36.
Developer Tools
Character Counter
See exactly how long your text is in characters, Unicode code points and bytes, and how many characters remain before a limit.
Text Tools
Hash Verifier
Paste the checksum you were given, drop the file, and see whether they match.
Hash & Checksum
Markdown Editor & Live Preview
Type or paste Markdown on one side and read the rendered result on the other, with instant document statistics.
Markdown & Diagrams
SHA-1 Hash Generator
Compute the 160-bit SHA-1 digest of any text or hex bytes instantly.
Hash & Checksum
UUID v7 Generator
Create UUID v7 values that sort by creation time, so they behave well as primary keys in databases and logs.
Developer Tools
XML Formatter & Beautifier
Turn compressed or messy XML into a cleanly indented document that is easy to read and review.
JSON & Data
YAML Formatter & Beautifier
Re-indent and normalise a YAML file while keeping comments, anchors and multi-document structure.
JSON & Data
Flowchart Generator
Describe a process one step chain per line and get a flowchart plus the Mermaid code behind it.
Markdown & Diagrams
SHA-512 Hash Generator
Get the 512-bit SHA-512 digest of your text or hex bytes, ready to copy as hex or Base64.
Hash & Checksum
Text Analyzer
A one-stop inspector for any string: size, character statistics, cryptographic digests and the raw bytes behind it.
Text Tools
Timestamp to Date Converter
Paste a column of epoch values from a log or a database export and get one readable date per line, plus a table with the detected unit.
Date & Time
UUID Validator & Version Detector
Paste one or many UUIDs to see which ones are valid, which version each is and, for time-based versions, when it was created.
Developer Tools
XML Validator
Find out whether your XML is well-formed and see precisely where it breaks.
JSON & Data
YAML Validator
Check that a YAML file is valid and find the exact place where it breaks.
JSON & Data
Date to Timestamp Converter
Type a date in almost any common format, choose the zone it is written in, and get the Unix timestamp in seconds and milliseconds.
Date & Time
JSON Minifier
Compress a JSON document to one compact line and see how many bytes you saved.
JSON & Data
Sequence Diagram Generator
Write one message per line and see who talks to whom, in order, as a sequence diagram.
Markdown & Diagrams
Case Converter
One tool for every text case: pick a style from the list and the text is converted instantly.
Text Tools
HMAC Generator
Sign a message with a secret key using HMAC and copy the authentication code as hex or Base64.
Hash & Checksum
JWT Inspector
Go beyond decoding: see every header parameter and claim explained, plus practical warnings about how the token is built.
Developer Tools
Markdown to HTML Converter
Turn Markdown into ready-to-paste HTML, as a fragment or a complete document, with a safe preview beside it.
Markdown & Diagrams
Subnet Calculator
Divide a network such as 192.168.0.0/24 into 4 subnets, or into /26 blocks, and get a ready-to-use allocation table.
Network Tools
UTM Builder
Fill in your campaign fields and get a tagged URL that updates as you type.
Developer Tools
Current Unix Timestamp
A live clock that shows the current epoch time in seconds and milliseconds, ready to copy, alongside the ISO 8601 UTC date and your local time.
Date & Time
Gantt Chart Generator
List tasks with a start and a duration and get a project timeline with sections and dependencies.
Markdown & Diagrams
JSON Viewer
Explore a JSON document as an expandable tree instead of a wall of text, with a summary of its structure.
JSON & Data
Remove Duplicate Lines
Paste a list and keep only unique lines, in the original order or sorted, with a count of what was removed.
Text Tools
UUID v5 Generator (Name-Based)
Turn names, URLs or domains into stable UUIDs: the same namespace and name always produce the same result.
Developer Tools
Class Diagram Generator
Write classDiagram code with classes, members and relations and see the UML diagram immediately.
Markdown & Diagrams
Excel to CSV Converter
Drop a spreadsheet, choose a sheet and get a clean CSV, with the delimiter and quoting you need.
JSON & Data
HTML Formatter
Paste minified or messy HTML and get clean, consistently indented markup you can read and diff.
Developer Tools
JSONPath Finder
Type a JSONPath expression and instantly see the values it selects in your JSON, together with the normalized path of each match.
JSON & Data
Sort Lines
Order any list one item per line: A to Z, Z to A, natural, numeric or by length.
Text Tools
Excel to JSON Converter
Drop a workbook and get the chosen sheet as a JSON array of objects, with dates as ISO text.
JSON & Data
Base64URL Encoder
Turn any text into a Base64URL string that can be pasted straight into a URL, a filename or a JWT segment.
Encoding & Decoding
CIDR Range Calculator
Turn an arbitrary start–end IP range into the smallest exact set of CIDR blocks, or expand CIDR blocks into their first and last address.
Network Tools
CSV to Excel Converter
Paste CSV and download a proper Excel workbook where numbers are numbers and dates are dates.
JSON & Data
Find and Replace
Search a block of text and replace every occurrence, as plain text or with a regular expression and capture groups.
Text Tools
HTML to Markdown Converter
Paste an HTML fragment or a saved web page and get clean Markdown with the style options you prefer.
Markdown & Diagrams
JSON to TypeScript
Paste a JSON sample and get ready-to-use TypeScript declarations that describe its shape.
JSON & Data
JWT Expiration Checker
See at a glance whether a token’s time claims put it inside or outside its validity window, and by how much.
Developer Tools
Query String Parser
Turn ?a=1&b=2 into a readable table and a JSON object, with percent-encoding and + signs decoded.
Developer Tools
SHA-384 Hash Generator
Compute the 384-bit SHA-384 digest of a text or hex bytes and copy it as hex or Base64.
Hash & Checksum
State Diagram Generator
List transitions between states and get a state machine diagram with events on the arrows.
Markdown & Diagrams
UTC to Local Time Converter
Enter a UTC date and time and see it in New York, Paris, Tokyo or any other zone, with the offset and whether daylight saving time is active.
Date & Time
Base64URL Decoder
Paste a URL-safe Base64 string, such as a JWT segment, and read the text inside immediately.
Encoding & Decoding
Excel Viewer
Look inside a spreadsheet without Excel: switch sheets, read the first rows and check the size of each sheet.
JSON & Data
Local Time to UTC Converter
Enter a wall-clock time from any zone and get the matching UTC time, with a warning when daylight saving makes that local time non-existent or ambiguous.
Date & Time
CSV Viewer
Paste CSV text or open a .csv file and inspect it as a table, with row and column counts and the detected delimiter.
JSON & Data
Decimal to Binary Converter
Turn decimal integers into binary, including negative numbers as two’s complement at the bit width you need.
Developer Tools
ER Diagram Generator
Describe your tables, keys and relationships as Mermaid erDiagram code and see the ER diagram instantly.
Markdown & Diagrams
File to Base64 Converter
Drop a file and get its Base64 string or a data: URL you can paste into HTML, CSS, JSON or an API request.
File Tools
JSON Key Sorter
Reorder the keys of every JSON object alphabetically to get a stable, canonical document.
JSON & Data
Random Number Generator
Pick random numbers in a range you define: integers of any size, decimals, and no-repeat draws.
Developer Tools
Regex Match Extractor
Pull every piece of text that matches a pattern out of a long document and get it as a tidy list.
Developer Tools
Time Difference Calculator
Enter a start and an end date-time and get the exact elapsed time, broken down into days, hours, minutes and seconds and as totals.
Date & Time
URL Slug Generator
Paste one title per line and get short, readable URL slugs ready for your CMS or router.
Developer Tools
Binary to Decimal Converter
Read binary as a decimal number, either as a plain unsigned value or as a signed two’s complement integer.
Developer Tools
Date Difference Calculator
Enter two dates and get the calendar difference in years, months and days, together with total days, weeks and the number of weekdays.
Date & Time
Add or Subtract Days from a Date
Pick a start date, choose add or subtract, an amount and a unit, and get the resulting date with its weekday.
Date & Time
Base64 to File Converter
Paste Base64 or a data URL, click decode, and download the original image, PDF, archive or any other file.
File Tools
CRC32 & Adler-32 Calculator
Compute a CRC-32 (IEEE 802.3) or Adler-32 checksum and read it as hex, decimal or Base64.
Hash & Checksum
Decimal to Hex Converter
Turn decimal integers into hexadecimal, with byte grouping, a 0x prefix and fixed-width two’s complement for negative values.
Developer Tools
Mind Map Generator
Type your ideas as an indented list and see them as a radial mind map.
Markdown & Diagrams
Regex Replace
Rewrite text with a regex pattern and a replacement template that can reuse the captured pieces.
Developer Tools
Remove Empty Lines
Strip blank lines from pasted text in one click, or keep a single blank line between paragraphs.
Text Tools
Remove URL Parameters
Clean links before you share or store them: remove tracking tags, or every query parameter, in bulk.
Developer Tools
Text to Binary Converter
Turn words into ones and zeros: each byte of your text is shown as eight bits.
Encoding & Decoding
Binary to Text Converter
Paste a string of ones and zeros and read the message hidden in it.
Encoding & Decoding
Hex to Decimal Converter
Read hexadecimal values as decimal numbers, unsigned or as signed two’s complement integers of 8 to 64 bits.
Developer Tools
IPv4 Address Validator
Paste one or many IPv4 addresses to see whether each is valid, why not if it is not, and what kind of address it is.
Network Tools
SHA-3 Hash Generator
Choose SHA3-224, 256, 384 or 512 and hash your text with the Keccak-based NIST standard.
Hash & Checksum
Text to Hex Converter
See the exact bytes behind any text, from a quick "Hello" to emoji, formatted the way your code or debugger expects.
Encoding & Decoding
Binary to Hex Converter
Turn bit patterns into hexadecimal digit by digit, keeping every leading zero so the width of the value is preserved.
Developer Tools
Create ZIP Online
Drop your files, pick a compression level and download a single .zip built right in your browser.
File Tools
CSV Validator
Check that a CSV is well-formed before importing it, and get a list of problems with line numbers.
JSON & Data
Extract Domain from URL
Paste URLs, one per line, and get the domain, hostname, subdomain or suffix of each in bulk.
Developer Tools
Hex to Text Converter
Paste hex bytes from a dump, a log or a source file and read the text they spell.
Encoding & Decoding
JSON Escape
Turn any text, even a whole JSON document, into a safe string you can embed inside another JSON value.
JSON & Data
Query String Builder
Write your parameters as plain lines or JSON and get a safely encoded query string.
Developer Tools
Remove Extra Spaces
Clean up spacing in pasted text: double spaces, stray tabs, trailing spaces and runs of blank lines.
Text Tools
Hex to Binary Converter
Expand hexadecimal values into their exact bit patterns, four bits per digit, with optional grouping and padding.
Developer Tools
JSON Unescape
Decode an escaped JSON string back into readable text, whether or not it is wrapped in quotes.
JSON & Data
CSV Delimiter Converter
Convert CSV between comma, semicolon, tab, pipe and custom delimiters without breaking quoted fields.
JSON & Data
Extract ZIP Online
Open a .zip, review its contents and download the files you want, with built-in protection against dangerous archives.
File Tools
HTML Minifier
Shrink your HTML with a conservative minifier that leaves <pre>, <textarea> and <script> content untouched.
Developer Tools
Random String Generator
Produce random tokens, IDs and test strings from the character set you need.
Developer Tools
Text Cleaner
Sanitize text copied from the web, documents or AI chats: invisible characters, curly quotes, odd spaces and Unicode quirks, each step under your control.
Text Tools
XML Minifier
Compress an XML document by removing the whitespace between elements and, optionally, comments.
JSON & Data
Excel Sheet Extractor
Split a workbook: pick a sheet and download it as its own .xlsx file, or export all sheets at once.
JSON & Data
AES Encrypt (AES-256-GCM)
Turn text into an authenticated AES-256-GCM ciphertext protected by your passphrase, entirely on your device.
Developer Tools
CSV Formatter
Re-serialize messy CSV into a consistent file: same quoting rules, trimmed cells, one delimiter and one line-ending style.
JSON & Data
Duration Converter
Type a duration in whatever style you have and see it in every unit, as an ISO 8601 duration and as a readable sentence.
Date & Time
HTML Entities Encoder
Escape markup characters, or turn every non-ASCII character into an entity such as é or é.
Encoding & Decoding
HTML to Text Converter
Paste HTML and get clean plain text with sensible line breaks, bullets and optional link addresses.
Developer Tools
IPv6 Address Validator
Check an IPv6 address, then see its canonical short form, its full 32-digit form and what kind of address it is.
Network Tools
JSON Diff – Compare Two JSON Documents
Paste two JSON documents and see what changed in the data, regardless of key order or indentation.
JSON & Data
Markdown Table Generator
Paste spreadsheet-style rows and get a tidy, GitHub-ready Markdown table with padded columns and per-column alignment.
Markdown & Diagrams
Regex Escape
Turn any literal text into a safe regex pattern by escaping the characters that have a special meaning, or reverse it.
Developer Tools
Text to ASCII Converter
List the ASCII / byte code of every character, for example "Hi" → 72 105.
Encoding & Decoding
Trim Lines
Remove the spaces and tabs at the start and end of each line of a list or block of text.
Text Tools
ZIP Viewer
Look inside an archive: every entry with size, compressed size, ratio, date and flags, plus warnings for anything suspicious.
File Tools
AES Decrypt (AES-256-GCM)
Paste the Base64 or hex ciphertext, enter the passphrase, and recover the original text.
Developer Tools
ASCII to Text Converter
Paste a list of ASCII / byte codes such as 72 101 108 108 111 and read the text.
Encoding & Decoding
CSV Filter
Keep only the CSV rows that match a condition on one column, or on any column at once.
JSON & Data
CSV Sorter
Order the rows of a CSV by one column, comparing values as text, natural text, numbers or dates.
JSON & Data
HTML Entities Decoder
Turn <, é, € and 😀 back into the characters they stand for.
Encoding & Decoding
Add Prefix / Suffix to Lines
Put the same text at the start and end of each line, or number the lines automatically.
Text Tools
CSV Column Extractor
Keep only the columns you need from a CSV, chosen by header name, position or range, in the order you list them.
JSON & Data
CSV Merger
Combine two CSV texts into one, either by stacking their rows or by placing them next to each other.
JSON & Data
Hex Viewer
Drop a file to see its raw bytes in the familiar offset | hex | ASCII layout, plus its detected type and size.
File Tools
Random List Picker
Paste a list, one item per line, and draw winners or shuffle the whole list at random.
Developer Tools
Strip HTML Tags
Delete every tag from a piece of HTML and keep only the text, with your choice of line breaks and entity decoding.
Developer Tools
Unicode Character Inspector
Paste text or an emoji and see exactly which code points, bytes and scripts it is made of.
Encoding & Decoding
CSV Deduplicator
Find and remove duplicate rows in a CSV, comparing whole rows or only the columns you choose.
JSON & Data
CSV Column Remover
Remove unwanted columns from a CSV by name, position or range and keep everything else exactly as it is.
JSON & Data
File Size Converter
Type a size like 1.5 GB or 700 MiB and see it in every unit, both decimal (SI) and binary (IEC).
File Tools
PBKDF2 Key Derivation Generator
Compute a PBKDF2 derived key from a password, salt, iteration count and hash, and check it against test vectors.
Developer Tools
Reverse Lines
Flip a list upside down: the last line becomes the first, the second-to-last becomes the second, and so on.
Text Tools
XML Escape
Make any text safe to place inside an XML element or attribute value.
JSON & Data
Base32 Encoder
Convert text into a Base32 string, the case-insensitive encoding used for authenticator secrets and file-safe identifiers.
Encoding & Decoding
File Extension Inspector
Enter an extension or a file name to learn what the format is, which MIME type it uses and whether it deserves caution.
File Tools
Random Bytes Generator
Get raw random bytes from the browser’s secure generator, formatted the way your code expects.
Developer Tools
ROT13 Cipher (ROT5, ROT18, ROT47)
Rotate letters by 13 places (or digits, or any Caesar shift) in one step. Running it twice restores the text.
Encoding & Decoding
XML Unescape
Convert XML entities and numeric character references back into the characters they stand for.
JSON & Data
Base32 Decoder
Paste a Base32 string and get the original text back, with a precise message if a character or length is wrong.
Encoding & Decoding
IP to Binary Converter
See any IP address as bits, for example 192.168.1.1 → 11000000.10101000.00000001.00000001.
Network Tools
Binary to IP Converter
Paste a 32-bit binary number (with or without dots) and get the dotted-decimal IPv4 address back; 128 bits give IPv6.
Network Tools
IP to Decimal Converter
Get the integer behind an IP address, in decimal or hex, for one address or a whole list.
Network Tools
Shuffle Lines
Randomize the order of any list with one click, using a fair shuffle that every arrangement is equally likely to result from.
Text Tools
Unicode Escape Converter
Turn é, ☕ and 😀 into \u00E9, \u2615 and \uD83D\uDE00 (or another escape style) for source code, JSON or CSS.
Encoding & Decoding
Decimal to IP Converter
Turn a decimal, 0x hexadecimal or 0b binary integer into the IPv4 or IPv6 address it represents.
Network Tools
Unicode Unescape Converter
Paste text full of \u00e9, U+1F600 or ☺ and read the real characters.
Encoding & Decoding
MAC Address Formatter & Validator
Paste MAC addresses in any common style to validate them and convert them to colon, hyphen, Cisco-dotted or plain 12-digit form.
Network Tools
Morse Code Translator
Type a message to see it in dots and dashes, or paste Morse to read it. The direction is detected automatically.
Encoding & Decoding
Reverse Text
Write text backwards, reverse the order of its words, or flip it upside down, without breaking emoji or accents.
Text Tools
Text to Decimal Converter
Get the Unicode number of every character: "é" is 233, "世" is 19990 and 😀 is 128512.
Encoding & Decoding
Decimal to Text Converter
Paste decimal Unicode code points and get the characters they stand for, emoji included.
Encoding & Decoding
Title Case Converter
Format titles and headlines the way a style guide expects: major words capitalized, short articles and prepositions in lowercase.
Text Tools
camelCase Converter
Turn any phrase or identifier into a clean camelCase (or PascalCase) variable name, one per line.
Text Tools
Punycode Converter (IDN Domains)
Turn münchen.de into xn--mnchen-3ya.de, or decode an xn-- domain to see the real name.
Encoding & Decoding
snake_case Converter
Turn names and phrases into snake_case identifiers for databases, Python, environment variables and config keys.
Text Tools
Text to Octal Converter
Write your text as base-8 byte values, for example "Hi" → 110 151, or as \110\151 escapes.
Encoding & Decoding
Octal to Text Converter
Paste octal byte values such as 110 145 154 154 157 or \110\145\154 and read the text.
Encoding & Decoding