# toolshd.online

> Free online tools for developers, creators, and everyone. Format JSON, convert images, count words, generate colours and inspect a website — no account needed.

Tool pages are plain server-rendered HTML. Text, JSON, colour, calculator and image tools run locally in the browser; only the SEO inspection tools use a server-side fetch.

## Developer Tools

- [Base64 Decoder](https://toolshd.online/tools/base64-decode): Decode Base64 back to readable text.
- [Base64 Encoder](https://toolshd.online/tools/base64-encode): Encode text or UTF-8 data as Base64, including URL-safe output.
- [Caesar Cipher and ROT13](https://toolshd.online/tools/caesar-cipher): Shift letters to encode or decode a Caesar cipher.
- [Chmod Calculator](https://toolshd.online/tools/chmod-calculator): Convert Unix permissions between 755 and rwxr-xr-x.
- [Cron Expression Explainer](https://toolshd.online/tools/cron-expression-explainer): Understand a cron schedule and see its next runs.
- [CSS Formatter](https://toolshd.online/tools/css-formatter): Expand compressed CSS into readable rules.
- [CSS Minifier](https://toolshd.online/tools/css-minifier): Shrink stylesheets by removing comments and whitespace.
- [CSV to JSON Converter](https://toolshd.online/tools/csv-to-json): Convert CSV rows into structured JSON, with type detection.
- [CSV to Markdown Table](https://toolshd.online/tools/csv-to-markdown-table): Turn spreadsheet data into a Markdown table.
- [Hash Generator (SHA-256, SHA-1, SHA-512)](https://toolshd.online/tools/hash-generator): Compute SHA checksums of text in your browser.
- [HMAC Generator](https://toolshd.online/tools/hmac-generator): Sign a message with a secret key using HMAC-SHA256.
- [HTML Entity Encoder / Decoder](https://toolshd.online/tools/html-entity-converter): Escape and unescape HTML entities in both directions.
- [HTML Formatter](https://toolshd.online/tools/html-formatter): Indent nested HTML and make long templates readable.
- [HTML Minifier](https://toolshd.online/tools/html-minifier): Remove comments and redundant whitespace from HTML.
- [HTML to Markdown Converter](https://toolshd.online/tools/html-to-markdown): Convert HTML into clean Markdown.
- [IP Subnet Calculator (CIDR)](https://toolshd.online/tools/subnet-calculator): Network, broadcast, mask and host range of an IPv4 subnet.
- [JavaScript Minifier](https://toolshd.online/tools/js-minifier): Strip comments and blank lines from JavaScript safely.
- [JSON Formatter](https://toolshd.online/tools/json-formatter): Pretty-print compact or broken JSON with a readable indentation.
- [JSON Minifier](https://toolshd.online/tools/json-minifier): Strip whitespace from JSON to shrink payloads.
- [JSON String Escape and Unescape](https://toolshd.online/tools/json-string-escape): Escape text for a JSON string, or read an escaped one.
- [JSON to CSV Converter](https://toolshd.online/tools/json-to-csv): Turn an array of JSON objects into a spreadsheet-ready CSV.
- [JSON to TypeScript Interface Generator](https://toolshd.online/tools/json-to-typescript): Generate TypeScript interfaces from a JSON sample.
- [JSON to YAML Converter](https://toolshd.online/tools/json-to-yaml): Turn JSON into readable YAML for configuration files.
- [JSON Validator](https://toolshd.online/tools/json-validator): Check JSON syntax and see exactly where it breaks.
- [JWT Decoder](https://toolshd.online/tools/jwt-decoder): Inspect the header and claims of a JSON Web Token.
- [Markdown Previewer](https://toolshd.online/tools/markdown-previewer): Write Markdown and see clean, sanitised HTML.
- [Number Base Converter](https://toolshd.online/tools/number-base-converter): Convert between binary, octal, decimal and hexadecimal.
- [Password Generator](https://toolshd.online/tools/password-generator): Strong passwords with a live entropy estimate.
- [Password Strength Checker](https://toolshd.online/tools/password-strength-checker): Estimate how long a password would resist guessing.
- [Random String Generator](https://toolshd.online/tools/random-string-generator): Create random tokens, codes and IDs with a custom alphabet.
- [Regex Tester](https://toolshd.online/tools/regex-tester): Test patterns against sample text with live match highlighting.
- [SQL Formatter](https://toolshd.online/tools/sql-formatter): Format SQL queries with consistent keywords and indentation.
- [Text Diff Checker](https://toolshd.online/tools/text-diff): Compare two texts line by line and see what changed.
- [Text to Binary Converter](https://toolshd.online/tools/text-to-binary): Convert text to binary, hex or decimal bytes and back.
- [Unix Timestamp Converter](https://toolshd.online/tools/unix-timestamp-converter): Convert epoch seconds and milliseconds to dates and back.
- [URL Decoder](https://toolshd.online/tools/url-decode): Turn percent-encoded URLs back into readable text.
- [URL Encoder](https://toolshd.online/tools/url-encode): Percent-encode text for URLs and query strings.
- [URL Parser](https://toolshd.online/tools/url-parser): Break a URL into protocol, host, path and query parameters.
- [User Agent Parser](https://toolshd.online/tools/user-agent-parser): Identify the browser, OS and device from a user agent.
- [UUID Generator](https://toolshd.online/tools/uuid-generator): Generate cryptographically random UUID v4 and time-ordered v7.
- [XML Formatter](https://toolshd.online/tools/xml-formatter): Indent XML documents while preserving their content.
- [XML Validator](https://toolshd.online/tools/xml-validator): Find unclosed tags and malformed markup.
- [YAML to JSON Converter](https://toolshd.online/tools/yaml-to-json): Convert a YAML document into JSON.

## Text Tools

- [Add Line Numbers](https://toolshd.online/tools/add-line-numbers): Number every line of a text or code listing.
- [Case Converter](https://toolshd.online/tools/case-converter): Switch text between sentence, title, camel, snake and kebab case.
- [Character Counter](https://toolshd.online/tools/character-counter): Count characters with and without spaces, plus byte size.
- [Fancy Text Generator](https://toolshd.online/tools/fancy-text-generator): Bold, italic, script and other Unicode styles to copy.
- [Find and Replace Text](https://toolshd.online/tools/find-and-replace): Replace text with plain strings or regular expressions.
- [List to Comma Separated Converter](https://toolshd.online/tools/list-converter): Turn a column of lines into a comma list and back.
- [Lorem Ipsum Generator](https://toolshd.online/tools/lorem-ipsum-generator): Generate placeholder paragraphs, sentences or words.
- [Morse Code Translator](https://toolshd.online/tools/morse-code-translator): Translate text to Morse code and Morse back to text.
- [Readability Score Checker](https://toolshd.online/tools/readability-checker): Flesch reading ease for English and French text.
- [Reading Time Calculator](https://toolshd.online/tools/reading-time): Estimate reading and speaking time for any text.
- [Remove Accents from Text](https://toolshd.online/tools/remove-accents): Strip diacritics: é becomes e, ç becomes c.
- [Remove Duplicate Lines](https://toolshd.online/tools/remove-duplicate-lines): Deduplicate a list while keeping the original order.
- [Remove Extra Spaces](https://toolshd.online/tools/remove-extra-spaces): Collapse double spaces, stray tabs and blank lines.
- [Remove Line Breaks](https://toolshd.online/tools/remove-line-breaks): Join broken lines from PDFs and emails into clean paragraphs.
- [Sentence Counter](https://toolshd.online/tools/sentence-counter): Count sentences and average sentence length.
- [Slug Generator](https://toolshd.online/tools/slug-generator): Turn titles into clean, URL-safe slugs.
- [Sort Lines Alphabetically](https://toolshd.online/tools/sort-lines): Sort any list with natural and numeric ordering.
- [Strip HTML Tags](https://toolshd.online/tools/strip-html-tags): Extract the plain text from HTML.
- [Text Comparison Tool](https://toolshd.online/tools/text-comparison): Score how similar two texts are, word by word.
- [Text Reverser](https://toolshd.online/tools/text-reverser): Reverse characters, words or whole lines.
- [Text to ASCII Converter](https://toolshd.online/tools/ascii-converter): Convert text to ASCII codes and back, in any base.
- [Unicode Inspector](https://toolshd.online/tools/unicode-inspector): Inspect code points, UTF-8 bytes and HTML entities per character.
- [Word Counter](https://toolshd.online/tools/word-counter): Count words, lines and paragraphs while you type.
- [Word Wrap Text](https://toolshd.online/tools/word-wrap-text): Wrap long lines at a fixed number of characters.

## Image Tools

- [Base64 to Image Converter](https://toolshd.online/tools/base64-to-image): Decode a Base64 string or data URI into an image.
- [Color Palette Extractor](https://toolshd.online/tools/color-palette-extractor): Pull the dominant colours out of any image.
- [EXIF Metadata Viewer](https://toolshd.online/tools/exif-viewer): Read camera metadata without uploading your photo.
- [Favicon Generator](https://toolshd.online/tools/favicon-generator): Create a multi-size favicon.ico and PNG app icons.
- [Image Color Picker](https://toolshd.online/tools/image-color-picker): Click any pixel to read its HEX, RGB and HSL values.
- [Image Compressor](https://toolshd.online/tools/image-compressor): Shrink JPG, PNG and WebP images without an upload.
- [Image Cropper](https://toolshd.online/tools/image-cropper): Crop images to exact regions or social aspect ratios.
- [Image Dimension Calculator](https://toolshd.online/tools/image-dimension-calculator): Scale dimensions while keeping the aspect ratio.
- [Image Format Inspector](https://toolshd.online/tools/image-info): Read dimensions, format, aspect ratio and file weight.
- [Image Resizer](https://toolshd.online/tools/image-resizer): Resize images by pixels with aspect ratio locked.
- [Image Rotator](https://toolshd.online/tools/image-rotator): Rotate and flip photos without losing quality.
- [Image to Base64 Converter](https://toolshd.online/tools/image-to-base64): Embed an image in HTML or CSS as a data URI.
- [JPG to WebP Converter](https://toolshd.online/tools/jpg-to-webp): Turn JPEG photos into lighter WebP files.
- [PNG to WebP Converter](https://toolshd.online/tools/png-to-webp): Convert PNG images to modern WebP, with transparency kept.
- [WebP to PNG Converter](https://toolshd.online/tools/webp-to-png): Convert WebP images to universally supported PNG.

## PDF Tools

- [Images to PDF](https://toolshd.online/tools/images-to-pdf): Turn JPG, PNG and WebP photos into a single printable PDF.
- [Merge PDF Files](https://toolshd.online/tools/pdf-merge): Combine several PDFs into one document, in the order you choose.
- [Rotate PDF Pages](https://toolshd.online/tools/pdf-rotate): Fix sideways scans by rotating all pages or only the ones you list.
- [Split PDF](https://toolshd.online/tools/pdf-split): Extract a page range or save every page of a PDF as its own file.

## Color & CSS

- [CMYK to HEX and RGB Converter](https://toolshd.online/tools/cmyk-converter): Convert between CMYK, HEX and RGB colour values.
- [Color Contrast Checker](https://toolshd.online/tools/color-contrast-checker): Test text and background colours against WCAG 2.2.
- [Color Palette Generator](https://toolshd.online/tools/color-palette-generator): Generate harmonious palettes from one base colour.
- [Colour Name Finder](https://toolshd.online/tools/color-name-finder): Find the closest CSS colour name to any shade.
- [CSS Border Radius Generator](https://toolshd.online/tools/css-border-radius-generator): Shape corners with independent radii and copy the CSS.
- [CSS Box Shadow Generator](https://toolshd.online/tools/css-box-shadow-generator): Design layered shadows and copy the CSS.
- [CSS Flexbox Playground](https://toolshd.online/tools/css-flexbox-playground): Learn and copy flexbox layout code visually.
- [CSS Gradient Generator](https://toolshd.online/tools/css-gradient-generator): Build linear and radial gradients with copy-ready CSS.
- [CSS Grid Playground](https://toolshd.online/tools/css-grid-playground): Prototype grid layouts and copy the CSS.
- [HEX to RGB Converter](https://toolshd.online/tools/hex-to-rgb): Convert HEX colour codes to RGB and HSL.
- [RGB to HEX Converter](https://toolshd.online/tools/rgb-to-hex): Convert RGB channel values into a HEX code.
- [RGB to HSL Converter](https://toolshd.online/tools/rgb-to-hsl): Convert RGB channels to hue, saturation and lightness.
- [Tints and Shades Generator](https://toolshd.online/tools/color-shades-generator): Build lighter and darker steps from one colour.

## SEO & Website

- [Basic Website SEO Audit](https://toolshd.online/tools/website-seo-audit): A quick, honest health check of one page.
- [Canonical URL Checker](https://toolshd.online/tools/canonical-checker): Check which URL a page declares as its canonical version.
- [Heading Structure Analyzer](https://toolshd.online/tools/heading-structure-analyzer): Outline a page’s H1–H6 hierarchy and catch skipped levels.
- [Hreflang Tag Generator](https://toolshd.online/tools/hreflang-generator): Generate correct hreflang clusters with x-default.
- [HTTP Header Inspector](https://toolshd.online/tools/http-header-inspector): Read response headers, status and redirect chain for a URL.
- [Keyword Occurrence Counter](https://toolshd.online/tools/keyword-occurrence-counter): Count exact, phrase and case-insensitive keyword matches.
- [Meta Tag Analyzer](https://toolshd.online/tools/meta-tag-analyzer): Fetch a live page and audit its title, description and social tags.
- [Meta Tag Generator](https://toolshd.online/tools/meta-tag-generator): Generate title, description, Open Graph and Twitter tags.
- [Open Graph Preview](https://toolshd.online/tools/open-graph-preview): See how your link looks when shared on social platforms.
- [Robots.txt Generator](https://toolshd.online/tools/robots-txt-generator): Write a robots.txt that crawlers obey.
- [Schema.org JSON-LD Generator](https://toolshd.online/tools/schema-jsonld-generator): Create valid JSON-LD for common page types.
- [Sitemap XML Generator](https://toolshd.online/tools/sitemap-generator): Build a valid sitemap.xml from a list of URLs.
- [Twitter/X Card Preview](https://toolshd.online/tools/twitter-card-preview): Preview and generate summary or large-image cards.
- [URL Status Checker](https://toolshd.online/tools/url-status-checker): Check HTTP status codes for up to five URLs at once.
- [Word Density Analyzer](https://toolshd.online/tools/word-density-analyzer): See which terms dominate your text, including 2-word phrases.

## Calculators & Converters

- [Add or Subtract Days from a Date](https://toolshd.online/tools/date-add-calculator): Find the date a number of days, weeks or months away.
- [Age Calculator](https://toolshd.online/tools/age-calculator): Calculate exact age and the next birthday.
- [Average Calculator](https://toolshd.online/tools/average-calculator): Mean, median, mode, range and standard deviation.
- [BMI Calculator](https://toolshd.online/tools/bmi-calculator): Body mass index from height and weight, metric or imperial.
- [BMR and Calorie Calculator](https://toolshd.online/tools/bmr-calculator): Basal metabolic rate and daily calorie needs.
- [Compound Interest Calculator](https://toolshd.online/tools/compound-interest-calculator): See how savings grow with interest and regular deposits.
- [Data Storage Converter](https://toolshd.online/tools/data-storage-converter): Convert bytes, kilobytes, mebibytes and more, correctly.
- [Date Difference Calculator](https://toolshd.online/tools/date-difference): Count days, weeks and business days between dates.
- [Discount Calculator](https://toolshd.online/tools/discount-calculator): Find the sale price and the amount saved.
- [Electricity Cost Calculator](https://toolshd.online/tools/electricity-cost-calculator): What an appliance costs to run per day, month and year.
- [Fraction Calculator](https://toolshd.online/tools/fraction-calculator): Add, subtract, multiply and divide fractions.
- [Fuel Cost Calculator](https://toolshd.online/tools/fuel-cost-calculator): Estimate the fuel cost of a trip and share it.
- [GCD and LCM Calculator](https://toolshd.online/tools/gcd-lcm-calculator): Greatest common divisor and least common multiple.
- [Length Converter](https://toolshd.online/tools/length-converter): Convert metres, feet, inches, miles and more.
- [Loan Calculator](https://toolshd.online/tools/loan-calculator): Monthly repayment, total interest and amortisation table.
- [Number to Words Converter](https://toolshd.online/tools/number-to-words): Write a number or an amount out in words.
- [Percentage Calculator](https://toolshd.online/tools/percentage-calculator): Solve the three percentage questions in one place.
- [Percentage Change Calculator](https://toolshd.online/tools/percentage-change): Measure increase or decrease between two values.
- [Prime Factorization Calculator](https://toolshd.online/tools/prime-factorization): Check if a number is prime and find its factors.
- [Profit Margin Calculator](https://toolshd.online/tools/profit-margin): Turn cost and price into margin and markup.
- [Random Number Generator](https://toolshd.online/tools/random-number-generator): Draw random integers or decimals in a range.
- [Roman Numeral Converter](https://toolshd.online/tools/roman-numeral-converter): Convert numbers to Roman numerals and back.
- [Rule of Three Calculator](https://toolshd.online/tools/rule-of-three-calculator): Solve a proportion: if A gives B, what does C give?
- [Running Pace Calculator](https://toolshd.online/tools/pace-calculator): Pace per km and per mile from distance and time.
- [Salary Converter](https://toolshd.online/tools/salary-converter): Convert pay between hourly, daily, monthly and yearly.
- [Speed, Distance and Time Calculator](https://toolshd.online/tools/speed-distance-time-calculator): Find speed, distance or travel time from the other two.
- [Temperature Converter](https://toolshd.online/tools/temperature-converter): Convert Celsius, Fahrenheit, Kelvin and Rankine.
- [Time Duration Calculator](https://toolshd.online/tools/time-duration-calculator): Add and subtract hours and minutes.
- [Time Zone Converter](https://toolshd.online/tools/timezone-converter): Compare a time across several time zones at once.
- [Tip Calculator and Bill Splitter](https://toolshd.online/tools/tip-calculator): Work out the tip and split the bill between people.
- [Unit Converter](https://toolshd.online/tools/unit-converter): Convert length, weight, volume, speed, area and data units.
- [VAT Calculator](https://toolshd.online/tools/vat-calculator): Add or extract VAT from a gross or net amount.
- [Week Number Calculator](https://toolshd.online/tools/week-number-calculator): Find the ISO week number of any date.
- [Weight Converter](https://toolshd.online/tools/weight-converter): Convert kilograms, pounds, ounces and stones.

## QR & Utilities

- [Barcode Generator](https://toolshd.online/tools/barcode-generator): Create Code 128, Code 39, EAN and UPC barcodes.
- [Email Address Validator](https://toolshd.online/tools/email-validator): Check email syntax and catch common domain typos.
- [Email QR Code Generator](https://toolshd.online/tools/email-qr-generator): Create a mailto QR code with a prepared message.
- [File Size Converter](https://toolshd.online/tools/file-size-converter): Turn a byte count into a human-readable size.
- [HTML Color Code Reference](https://toolshd.online/tools/color-reference): Browse named colours with HEX, RGB and HSL values.
- [HTTP Status Codes Reference](https://toolshd.online/tools/http-status-codes): Look up what any HTTP status code means.
- [IP Address Validator](https://toolshd.online/tools/ip-validator): Validate and classify IPv4 and IPv6 addresses.
- [List Randomizer and Name Picker](https://toolshd.online/tools/list-randomizer): Shuffle a list, draw winners or make random teams.
- [MIME Type Lookup](https://toolshd.online/tools/mime-type-lookup): Find the MIME type for a file extension, or the reverse.
- [QR Code Generator](https://toolshd.online/tools/qr-code-generator): Create a QR code for any text or URL, with SVG and PNG export.
- [URL QR Code Generator](https://toolshd.online/tools/url-qr-generator): Turn a link into a QR code with a validation step.
- [Wi-Fi QR Code Generator](https://toolshd.online/tools/wifi-qr-generator): Let guests join your network by scanning a code.

## Policies

- [Privacy policy](https://toolshd.online/privacy-policy)
- [Terms of service](https://toolshd.online/terms-of-service)