51 tools

Developer and web tools

51 free developer and web tools tools, all running in your browser with no sign-up.

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MD5 hash generatorCompute the MD5 digest of any text or hex bytes in your browser, shown as hex and Base64 with the input size in bytes.
SHA-1 hash generatorCompute the 160-bit SHA-1 digest of any text or hex bytes and view it as lowercase hex, uppercase hex and Base64.
SHA-256 hash generatorCompute the SHA-256 digest of Arabic or English text or hex bytes, as hex and Base64, without sending any data to a server.
SHA-384 hash generatorCompute the 384-bit SHA-384 digest of text or hex bytes, including the Base64 form used by the script integrity attribute.
SHA-512 hash generatorCompute the 512-bit SHA-512 digest of text or hex bytes as a 128-character hex string and as Base64, with the input size.
SHA3-256 hash generatorCompute the FIPS 202 SHA3-256 digest of text or hex bytes as hex and Base64, and see how it differs from Keccak-256.
CRC32 checksum calculatorCompute the CRC-32 of any text or hex bytes, the variant used by ZIP, PNG and Ethernet, as hex and as a decimal number.
HMAC-SHA256 generatorCompute an HMAC-SHA256 signature for a message with a text or hex secret key, as hex and Base64, to check webhooks and API calls.
UUID v4 generatorGenerate up to 100 random UUID v4 values at once from a secure random source, with uppercase, hyphen and brace options.
UUID v7 generatorGenerate time-ordered UUID v7 values that start with a millisecond timestamp, optionally for a chosen time, with the UTC date shown.
UUID validator and decoderCheck whether a UUID or GUID is well formed, see its version, variant and canonical form, and read the date inside v1, v6 and v7 ids.
ULID generatorGenerate 26-character ULIDs that sort by time as plain text, for now or a time you pick, with the time part and its date shown.
Nano ID generatorGenerate short, URL-safe Nano IDs with the length and alphabet you choose, and see how many bits of randomness each id carries.
Random hex string generatorGenerate secure random hex strings of any length for API keys, session tokens and salts, with optional 0x prefix and uppercase.
Luhn algorithm checkerCheck card numbers, IMEIs and other ids with the Luhn algorithm, and work out the check digit to append, with the running sum.
ISBN validator and converterCheck whether an ISBN-10 or ISBN-13 is valid by its check digit and convert between the two forms, including the X in ISBN-10.
IBAN validatorValidate an IBAN from Saudi Arabia, the UAE, the Gulf, Europe and more with the mod 97 test and country length, and get correct check digits.
IPv4 subnet calculator (CIDR)Get the network and broadcast address, usable host range, host count, subnet mask and wildcard from an IPv4 address and prefix.
IP address to binary, decimal and hexConvert an IPv4 address to dotted binary with 8 bits per octet, to a single decimal integer, and to hexadecimal.
Decimal integer to IP addressTurn an integer from 0 to 4294967295, or a 0x hex value, back into a normal dotted IPv4 address with its binary form.
IPv6 address expander and compressorEnter an IPv6 address in any form to get the full 8-group form, the RFC 5952 compressed form, and the ip6.arpa reverse name.
IP range to CIDR converterTurn an IPv4 range from a start address to an end address into the smallest list of CIDR blocks, ready for firewall rules.
IP address type checker: public or privateCheck whether an IPv4 or IPv6 address is public, private, loopback, link-local, multicast or documentation, with its range and RFC.
MAC address formatterConvert a MAC address between colon, hyphen and Cisco dot formats, see if it is unicast or multicast, global or local, and its EUI-64 link-local IPv6.
Port number lookupEnter a TCP or UDP port number to see the common service that uses it, such as 22 for SSH or 443 for HTTPS, and its IANA range.
Chmod calculatorConvert Linux permissions between octal like 755 and symbolic like rwxr-xr-x, with a table of owner, group and others rights.
Cron expression explainer and next runsPaste a 5-field cron expression to get a plain explanation and the next 5 run times from a date you choose.
HTTP status code lookupEnter an HTTP status code like 404 or 503 to see its official name, meaning, class, RFC and default cacheability, plus nginx and Cloudflare codes.
MIME type lookup by file extensionType a file extension like pdf, webp or docx to get the correct MIME type and a ready Content-Type header for your server or code.
User agent parserPaste a user agent string to see the browser and version, operating system, device type, rendering engine, and whether it is a bot.
URL parserPaste any URL to split it into scheme, host, port, path, query and fragment, with a table of every query parameter decoded.
Query string builderWrite one name=value pair per line to get a correctly encoded query string and a full URL ready to copy, including Arabic text.
Cookie and Set-Cookie header parserSplit a Cookie header into a name and value table, or a Set-Cookie header into attributes like Secure, HttpOnly and SameSite, with common mistake warnings.
JWT decoderPaste a JWT to read its header and payload as JSON and its iat, exp and nbf times in UTC. It decodes only and does not verify the signature.
Regex tester (JavaScript)Test a JavaScript regular expression against your text and list every match with its position and groups, plus an optional replace.
CSS beautifierFormat minified or messy CSS: one property per line, indentation inside rules and media queries, and a space after each colon.
CSS specificity calculatorCalculate CSS selector specificity as (IDs, classes, types) per Selectors Level 4, including :is, :not and :where, and compare selectors.
SQL string escapeTurn text into a valid SQL string literal by doubling single quotes per the standard, or with MySQL style backslash escapes.
Regex escapeTurn any text into a regex pattern that matches it literally by escaping special characters like . * + ? ( ) [ ] { } | ^ $ for JavaScript.
SQL formatterFormat a long SQL query into tidy lines: each clause like SELECT, FROM and WHERE on its own line, with indented columns, conditions and subqueries.
CSS minifierMinify CSS by removing comments, extra spaces, line breaks and the last semicolon in each block, keeping strings intact and showing the saving.
HTML minifierMinify HTML by removing comments and collapsing spaces and line breaks, while protecting pre, textarea, script and style content, and see the saving.
Aspect ratio calculatorFind the simplified aspect ratio such as 16:9 for any dimensions, and get the new height or width when resizing while keeping the ratio.
CSS box-shadow generatorBuild CSS box-shadow code by setting the offsets, blur, spread, color, opacity and an optional inset shadow.
CSS gradient generatorCreate linear, radial or conic CSS gradient code from two or three colors with the angle and stop positions, ready to copy as a background.
CSS clamp() generatorBuild a clamp() value for a font size or spacing that scales smoothly between a small and a large screen, in rem or px, with slope and intercept.
Favicon link tags generatorGenerate the HTML tags for your favicon, Apple touch icon, web manifest and theme color, plus the list of image files and sizes to prepare.
.htaccess redirect generatorCreate Apache .htaccess redirect rules: a 301 or 302 page redirect, force HTTPS, remove or add www, or move a whole domain.
CSS filter generatorBuild CSS filter code for images and elements: blur, brightness, contrast, grayscale, hue rotate, invert, saturate and sepia, plus a backdrop-filter version.
CSS border-radius generatorBuild border-radius code for rounded corners with a value per corner, and the tool shortens it to the shortest valid shorthand automatically.
CSS text-shadow generatorBuild CSS text-shadow code for text and headings by setting the horizontal and vertical offset, blur, color and opacity.