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Developer Tools
Encoders, generators and utilities for building things. 55 free tools, no sign-up.
Base64 Encode / DecodeConvert text to Base64 and decode Base64 back to text instantly in your browser. UTF-8 safe.Hash Generator (SHA-1 / SHA-256 / SHA-512)Create SHA-1, SHA-256 and SHA-512 hashes from any text instantly in your browser using the Web Crypto API.XML FormatterPretty-print messy or minified XML with clean indentation so nested elements and attributes are easy to read.YAML FormatterNormalize indentation and re-serialize your YAML into clean two-space output by round-tripping it through a parser. Catches errors too.Binary to TextDecode 8-bit binary into readable text and encode text back to binary. UTF-8 safe, tolerant of spaces between bytes.Cron BuilderPick minute, hour, day, month and weekday from dropdowns to generate a valid crontab expression with a live plain-English preview.JSON DiffCompare two JSON objects and see added, removed and changed keys with their old and new values, computed entirely in your browser.Text Diff CheckerCompare two blocks of text line by line and see exactly which lines were added, removed or unchanged, computed in your browser.Chmod CalculatorToggle read, write and execute permissions for owner, group and others to get the octal chmod number and symbolic notation instantly.ASCII Table ReferenceBrowse all 128 ASCII characters with their decimal, hexadecimal, octal and binary values plus names for control characters.Robots.txt GeneratorFree robots.txt generator. Pick which crawlers to allow or block, add disallow paths, crawl delay and a sitemap URL, then copy a valid robots.txt file. Private.UUID v7 GeneratorCreate time-ordered, sortable version-7 UUIDs in bulk. Great for database keys where insertion order and index locality matter. Private.JWT Generator (HS256)Build and sign a JSON Web Token from your payload and a secret using HS256 via the Web Crypto API. Pairs with the JWT decoder. Runs privately.URL Encoder / DecoderPercent-encode text for URLs or decode encoded URLs instantly. Handles query strings and special characters.UUID GeneratorInstantly generate random v4 UUIDs (GUIDs), one or in bulk. Cryptographically random, copy with one click.Unix Timestamp ConverterConvert epoch timestamps to human-readable dates and dates back to Unix time. Supports seconds and milliseconds.JSON MinifierStrip whitespace and newlines to compress JSON into the smallest valid payload for APIs, configs and bundles. Validates as it minifies.JSON ValidatorCheck if your JSON is valid, get the exact error location on failure, and see a pretty-printed version when it parses cleanly.JSON to CSVTurn an array of JSON objects into a clean CSV file with headers, ready for Excel, Sheets or a database import.CSV to JSONParse CSV with a header row into a clean array of JSON objects, handling quoted fields and embedded commas correctly.JSON to YAMLTurn JSON config or API data into clean, readable YAML for Kubernetes, CI pipelines, Docker Compose and app config files.YAML to JSONParse YAML config into clean JSON for APIs, tooling and validation. Handles nested maps, lists, comments and scalars.HTML Formatter / BeautifierIndent messy or minified HTML into clean, readable markup with proper nesting so you can scan structure at a glance.CSS FormatterExpand minified CSS into clean, indented rules with one declaration per line so stylesheets are easy to read and edit.JS Formatter / BeautifierExpand minified or one-line JS into readable, indented code with proper brace and block structure.SQL FormatterTurn long, cramped queries into clean, indented SQL with keywords on their own lines so complex statements are readable.HTML Entity Encode / DecodeConvert characters like < > & " to safe HTML entities and back, so text renders literally instead of as markup.Unicode Escape / UnescapeConvert text to backslash-u escape sequences and back, ideal for embedding non-ASCII characters in JSON and source code.Hex to TextDecode hexadecimal byte sequences into readable text and encode text back to hex. UTF-8 safe, handles spaces and 0x prefixes.JWT DecoderDecode a JSON Web Token to inspect its header and payload claims instantly in your browser. Shows expiry in human-readable time.Regex TesterTest JavaScript regular expressions against sample text with live match highlighting, capture groups and flag toggles in your browser.Cron Expression ParserPaste a cron schedule to get a plain-English explanation and the next upcoming run times, all computed in your browser.Number Base ConverterConvert between binary, octal, decimal and hexadecimal instantly. Type in any base and see all four representations update live.gitignore GeneratorSelect your languages, frameworks and tools to build a solid .gitignore file with sensible defaults, ready to copy into your repo.HTTP Status Codes ReferenceSearch all standard HTTP response codes from 1xx to 5xx with their names and meanings. Filter instantly as you type.MIME Types ReferenceSearch common file extensions and their content-type values for setting HTTP headers, uploads and downloads. Filter instantly.Color Hex to RGBConvert hex color codes to rgb() and back, with a live swatch preview and support for shorthand hex.CSS MinifierStrip comments, whitespace and newlines to shrink stylesheets for faster page loads. Shows how many bytes you saved. Runs in your browser.JavaScript MinifierRemove comments and collapse whitespace to shrink JS for quick inline use. Preserves strings and reports bytes saved.SQL MinifierCollapse a multi-line SQL query into a single compact line by stripping comments and extra whitespace. Great for logs and embedding. Private.JSON String Escape / UnescapeEscape text into a safe JSON string literal, or unescape a JSON string back to raw text. Handles quotes, newlines and unicode. Private.String Length CalculatorCount characters, bytes in UTF-8, words and lines in any string, with and without spaces. Useful for limits and encoding. Private.Placeholder Photo URL BuilderConfigure width, height, grayscale, blur and a seed to generate ready-to-use random placeholder photo URLs for mockups. Private.Base32 Encode / DecodeConvert text to standard RFC 4648 Base32 and decode it back. Handy for TOTP secrets, identifiers and case-insensitive tokens.ROT47 Encoder and DecoderRotate printable ASCII by 47 positions to scramble text, including symbols and digits. Its own inverse, so one button does both.Query String ParserPaste a URL or query string and see every parameter and value in a clean table, with URL decoding and repeated keys handled. Private.HTML Table GeneratorChoose rows and columns, toggle a header row, and get clean, ready-to-paste HTML table markup with a live preview. Runs privately.CSS Box Shadow GeneratorAdjust offset, blur, spread, color and inset with live sliders and preview, then copy the ready-to-use box-shadow rule. Private.Slugify (URL Slug Generator)Turn any title or phrase into a clean URL-safe slug: lowercase, accents stripped, spaces and symbols collapsed into hyphens. Runs privately.HTML to TextStrip tags and markup from HTML and get the clean plain text content, decoded and readable. All processing stays in your browser.HMAC GeneratorCompute a keyed HMAC over any message with SHA-256, SHA-384 or SHA-512 using the Web Crypto API. Hex output, computed in your browser..env to JSONFree .env to JSON converter. Paste your dotenv KEY=VALUE lines and get a clean, pretty-printed JSON object. Comments and blank lines are ignored. Runs privately.CSS px to rem / em ConverterConvert px to rem and em, or rem and em back to px, with an adjustable root font size. Instant results, computed in your browser.UUID ValidatorPaste a string to check whether it is a valid UUID and see which version (1 through 8) and variant it uses. Instant, private, in your browser.String Case ConverterTurn any text into camelCase, snake_case, kebab-case, PascalCase or CONSTANT_CASE at once. Live, private, in your browser.
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Free developer tools: Base64, URL encoding, UUID and hash generators, timestamp converters. Fast, client-side, no sign-up. All 55 tools are free, run entirely in your browser, and need no sign-up.
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CheckWebPerforms site audit with performance, security, accessibility, and legal checks.checkwebs.fr
myideBrowser agentic IDE — writes, verifies UI, publishesmyide.tech
SendHQTransactional email API for developers and AI agentssendhq.cc
Agentic Coding KitGuardrails, hooks, and subagent patterns that keep AI coding assistants on the rails.kitforgedev.itch.io
FixerCodeHTTP, web, and software error code referencefixercode.comFrequently asked questions
Are these developer tools free?
Yes. Every developer tool on yourhack.ai is completely free, with no sign-up and no usage limits.
Do these developer tools work on mobile?
Yes. They run in any modern web browser on phone, tablet or desktop. There is nothing to install.
Is my data private?
Yes. These tools run entirely in your browser, so nothing you enter is uploaded to a server.
How many developer tools are there?
There are currently 55 free developer tools here, and we add more regularly.
