IO Tools - Developer Kit

🧰 A developer toolbox that lives in your browser's side panel.

IO Tools - Developer Kit puts 50 everyday utilities one keystroke away, and they run right there in the panel, next to the page you're working on. No tab switching, no uploads, no waiting on a server. Encode a string, hash a password, format a blob of JSON, check a colour contrast ratio, decode a JWT, then get straight back to what you were doing.

It also searches the full catalogue of 1,000+ tools on iotools.cloud, so the 50 bundled ones are a starting point rather than a limit.

🌟 Why you'll want it

⚡ It's fast because it's local. The 50 bundled tools are plain JavaScript inside the extension. Your text is processed in your own browser and is never uploaded, logged, or sent anywhere. They work on a plane, on hotel Wi-Fi, or behind a corporate firewall. And you can paste in a production API key to decode it without thinking twice.

📌 It doesn't get in your way. The side panel docks beside your page and stays put while you browse (Chrome, Edge and Opera). It doesn't vanish the moment you click somewhere else, the way a popup does.

🔍 Search finds it before you finish typing. Fuzzy search across every tool name and description, focused the instant the panel opens, so you can start typing before the list has even finished loading. No mode to be in, no filter to remember to clear.

🖱 Transform text without opening anything. Select text on any page, right-click, and convert case, Base64, URL-encode, hash, slugify or format JSON in place. The result goes straight to your clipboard with a confirmation toast.

✨ Features

✓ 50 tools that run locally. No network, no upload, no account. ✓ Docked side panel. Stays open while you work instead of closing on click-away. ✓ Fuzzy search across 1,000+ tools, focused the moment the panel opens. ✓ No modes to get lost in. An empty box shows the 50 that run here; typing searches all 1,000+. ✓ Pin your favourites to the top of the list. They stay pinned across sessions. ✓ Right-click menu with 15 one-click text transforms on any page. ✓ Keyboard navigation. Ctrl+Shift+0 (⌘+Shift+0 on Mac) opens the panel, arrow keys walk the list, / jumps back to search. ✓ Dark mode that follows your system theme. ✓ No account, no sign-up, no tracking. Nothing to configure.

🛠 The 50 tools that run in the panel

📝 Text (8) ✓ Case Converter: switch between upper, lower, title, camel, snake and more ✓ Word Counter: characters, words, sentences, paragraphs and lines ✓ String Length Calculator: character, grapheme, word and UTF-8 byte length ✓ Word Frequency Counter: count how often each word appears ✓ Whitespace Trimmer: trim lines, collapse repeated spaces, strip blank lines ✓ Duplicate Line Remover: remove repeated lines, keeping the first ✓ Reverse Text: reverse by character, word or line order ✓ Slug Generator: turn a title into a URL-friendly slug

🔐 Encode & Cipher (10) ✓ Base64 Encoder / Decoder: encode text to Base64 or decode it back ✓ URL Encoder / Decoder: percent-encode text for a URL, or decode it ✓ HTML Entity Encoder / Decoder: escape HTML-sensitive characters or decode entities ✓ Base32 Encoder / Decoder: RFC 4648 Base32 ✓ Base58 Encoder / Decoder: Bitcoin-alphabet Base58 ✓ Caesar Cipher / ROT13: shift letters by N positions ✓ Atbash Cipher: classic A↔Z substitution cipher ✓ Morse Code Translator: text to Morse and back ✓ Leetspeak Converter: l33t sp34k substitution ✓ Pig Latin Translator: translate English to Pig Latin

🔑 Hash & Security (5) ✓ Hash Generator: MD5, SHA-1, SHA-256, SHA-384 or SHA-512 digest ✓ UUID Generator: cryptographically random UUID v4s ✓ Password Generator: strong random passwords via crypto.getRandomValues ✓ Password Strength Analyzer: estimate entropy and strength ✓ CRC32 Checksum Generator: IEEE 802.3 CRC-32 checksum

🔢 Number & Data (11) ✓ Binary ⇄ Text Converter: text to space-separated binary bytes and back ✓ Text ⇄ Hex Converter: text to hex bytes and back ✓ Number Base Converter: integers between binary, octal, decimal and hex ✓ Unix Timestamp Converter: timestamps to dates and dates to timestamps ✓ Roman Numeral Converter: numbers to Roman numerals and back ✓ Number to Words: spell out a number in English ✓ Temperature Converter: Celsius, Fahrenheit and Kelvin ✓ Percentage Calculator: X% of Y, what % X is of Y, or % change ✓ JSON Formatter & Validator: pretty-print or minify JSON with validation ✓ CSV to JSON Converter: parse CSV rows into a JSON array of objects ✓ JSON to CSV Converter: flatten a JSON array of objects into CSV

🎨 Color (6) ✓ HEX to RGBA Converter: HEX to rgba() with adjustable alpha ✓ RGBA to HEX Converter: R, G, B, A values to a HEX color ✓ Color Mixer: blend two colors at a given ratio ✓ Color Tint/Shade Generator: lighter tints and darker shades of a color ✓ Random Color Generator: a palette of random HEX colors ✓ WCAG Contrast Checker: check a foreground/background pair against WCAG AA/AAA

🌐 Web & Dev (5) ✓ JWT Decoder: decode a JWT header and payload (no signature verification) ✓ Regex Tester: test a regular expression against sample text ✓ URL Parser: break a URL into protocol, host, path and query params ✓ IPv4 Subnet Calculator: network, broadcast and usable host range for a CIDR block ✓ MAC Address Formatter: normalize a MAC address into colon, hyphen or dot form

🎲 Generators (5) ✓ Lorem Ipsum Generator: placeholder text by words, sentences or paragraphs ✓ List Randomizer: shuffle, sort or deduplicate a list of lines ✓ Random Number Generator: random numbers in a range, with or without repeats ✓ Username Generator: adjective + noun username suggestions ✓ Anagram Generator: find anagrams for a short word

🖱 Right-click transforms

Select any text on any page, right-click, choose IO Tools:

✓ UPPERCASE ✓ lowercase ✓ Title Case ✓ kebab-case ✓ Base64 Encode ✓ Base64 Decode ✓ URL Encode ✓ URL Decode ✓ MD5 Hash ✓ SHA-1 Hash ✓ SHA-256 Hash ✓ Slugify ✓ Format JSON ✓ Count Words and Characters ✓ Generate and Copy UUID

Every result is copied to your clipboard with a toast showing what was copied. Nothing is sent anywhere.

🔎 Search all 1,000+ tools on iotools.cloud

There is no mode to switch. Leave the search box empty and you get the 50 tools that run in the panel. Start typing and the same box searches the entire iotools.cloud catalogue (PDF and image conversion, calculators, formatters, generators, validators and much more) in relevance order. A Local badge marks the ones that open right here; everything else carries an external-link glyph and opens in a new tab. You are never told a tool doesn't exist because you happened to be looking at the wrong half of the catalogue.

🔒 Privacy

No account. No sign-up. No analytics. No tracking.

The 50 bundled tools run entirely inside your browser, so the text you paste is never transmitted. The extension makes exactly one network request: fetching the public list of tool names and links from iotools.cloud so the search box can cover the full catalogue. That request carries no personal data and no identifiers.

The extension asks for no access to your browsing history and no access to the sites you visit.