Show HN: CodeKitHub – Free browser-based tools, files never leave your device

CodeKitHub launched a free, browser-based tool suite for developers and everyday tasks, featuring JSON formatting, text manipulation, encoding, and AI prompt libraries, all processing data locally without uploads or logins.

Free Online Tools for Everyone Fast, free and privacy-friendly tools for developers and everyday tasks. Everything runs in your browser — no login, no upload, no limits. Categories { } /en/json-tools/ JSON Tools Format, validate and work with JSON data. Tt /en/text-tools/ Text Tools Count, compare and transform text. < /en/encode-tools/ Encode Tools Encode, decode and hash data. ⏱ /en/time-tools/ Time Tools Convert timestamps and work with dates. ⚡ /en/generator-tools/ Generator Tools Generate UUIDs, hashes and more. ✦ /en/everyday-tools/ Everyday Tools Passwords, QR codes, calculators and converters for daily life. ◎ /en/webmaster-tools/ Webmaster Tools SEO and site-management utilities for webmasters and developers. ✧ /en/ai-tools/ AI Tools Curated AI prompt libraries and utilities — no API calls, no cost, no login. ▣ /en/image-tools/ Image Tools Convert and compress images — right in your browser, no upload. Featured Tools { } /en/json-formatter/ JSON Formatter Format, beautify, validate and minify JSON with instant error checking. < /en/base64-encoder/ Base64 Encoder / Decoder Encode text to Base64 or decode it back — UTF-8 safe, instant. ⚡ /en/uuid-generator/ UUID Generator Generate cryptographically secure UUID v4 identifiers, in bulk. ⏱ /en/timestamp-converter/ Timestamp Converter Convert Unix timestamps to dates and back, with a live epoch clock. ✦ /en/password-generator/ Password Generator Generate strong random passwords with custom length and characters. ✦ /en/qr-code-generator/ QR Code Generator Create QR codes with live preview and PNG download — no watermark. ▣ /en/image-compressor/ Image Compressor Compress JPG/PNG/WebP images locally — no upload, no limits. ✧ /en/student-ai-prompts/ Student AI Prompt Library Categorized AI prompts for students — one-click copy, ready to use. ✧ /en/teacher-ai-prompts/ Teacher AI Prompt Library Categorized AI prompts for teachers — one-click copy, ready to use. ◎ /en/robots-txt-generator/ Robots.txt Generator Generate robots.txt — presets for AI crawlers, custom paths, sitemap. All Tools { } /en/json-formatter/ JSON Formatter Format, beautify, validate and minify JSON with instant error checking. < /en/base64-encoder/ Base64 Encoder / Decoder Encode text to Base64 or decode it back — UTF-8 safe, instant. ⚡ /en/uuid-generator/ UUID Generator Generate cryptographically secure UUID v4 identifiers, in bulk. ⏱ /en/timestamp-converter/ Timestamp Converter Convert Unix timestamps to dates and back, with a live epoch clock. < /en/url-encoder/ URL Encoder / Decoder Percent-encode or decode URLs and query parameters correctly. ⚡ /en/md5-generator/ MD5 Generator Generate MD5, SHA-1 and SHA-256 hashes from any text instantly. Tt /en/word-counter/ Word Counter Live word, character, sentence and reading-time counts as you type. Tt /en/regex-tester/ Regex Tester Test regex patterns with live highlighting and capture groups. ⚡ /en/color-converter/ Color Converter Convert colors between HEX, RGB and HSL with live preview. Tt /en/text-diff/ Text Diff Compare two texts and see added/removed lines highlighted. ✦ /en/password-generator/ Password Generator Generate strong random passwords with custom length and characters. ✦ /en/qr-code-generator/ QR Code Generator Create QR codes with live preview and PNG download — no watermark. ✦ /en/rick-roll-qr-code/ Rick Roll QR Code A ready-to-print QR code that rickrolls whoever scans it. ✦ /en/age-calculator/ Age Calculator Your exact age in years, months, days — plus next-birthday countdown. ✦ /en/percentage-calculator/ Percentage Calculator X% of a number, what percent X is of Y, and percentage change. ✦ /en/date-calculator/ Date Calculator Find the days between two dates, or add/subtract days, weeks, months and years. ✦ /en/loan-calculator/ Loan Calculator Monthly payment and total interest for a fixed-rate loan. ✦ /en/unit-converter/ Unit Converter Length, weight, temperature, area, volume and speed conversions. ✦ /en/case-converter/ Case Converter Convert text to UPPER, lower, Title, camelCase, snake case and more. ✦ /en/random-number-generator/ Random Number Generator Random numbers in any range — bulk, unique draws, sorting. ▣ /en/image-compressor/ Image Compressor Compress JPG/PNG/WebP images locally — no upload, no limits. ▣ /en/png-to-jpg/ PNG to JPG Converter Convert PNG images to JPG locally, with batch support. ▣ /en/jpg-to-png/ JPG to PNG Converter Convert JPG images to lossless PNG locally, batch supported. ▣ /en/webp-to-jpg/ WebP to JPG Converter Convert WebP images to universally compatible JPG, locally. ▣ /en/heic-to-jpg/ HEIC to JPG Converter Convert iPhone HEIC photos to JPG — private, on your device. ▣ /en/image-resizer/ Image Resizer Resize images by pixel width or percent — aspect ratio kept. ▣ /en/jpg-compressor/ JPG Compressor Shrink JPG/JPEG files with adjustable quality — no upload. ▣ /en/png-compressor/ PNG Compressor Compress PNGs via palette quantization — transparency preserved. ▣ /en/svg-converter/ SVG Converter Rasterize SVG vectors to PNG/JPG at any resolution, locally. ▣ /en/gif-compressor/ GIF Compressor Shrink animated GIFs: colors, scale, frame-drop — no upload. ✧ /en/student-ai-prompts/ Student AI Prompt Library Categorized AI prompts for students — one-click copy, ready to use. ✧ /en/teacher-ai-prompts/ Teacher AI Prompt Library Categorized AI prompts for teachers — one-click copy, ready to use. ✧ /en/school-staff-ai-prompts/ K-12 School Staff AI Prompt Library AI prompts for principals, HR, counselors, compliance, facilities and more — one-click copy. ✧ /en/college-student-ai-prompts/ College Student AI Prompt Library AI prompts for essays, exams, research, time management and career prep — one-click copy. Tt /en/text-cleaner/ Text Cleaner Remove duplicate lines, blank lines and extra spaces — all in one tool. Tt /en/chinese-converter/ Chinese Converter Convert Simplified/Traditional Chinese with regional standard support. Tt /en/pinyin-converter/ Chinese to Pinyin Converter Chinese to Pinyin, 4 formats, smart multi-reading detection. ✦ /en/qr-code-decoder/ QR Code Decoder Decode a QR code from an uploaded image — local, no app needed. ◎ /en/robots-txt-generator/ Robots.txt Generator Generate robots.txt — presets for AI crawlers, custom paths, sitemap. ✦ /en/rmb-uppercase/ Chinese Numeral Currency Converter Convert numeric amounts to Chinese uppercase currency format. ✦ /en/check-amount-to-words/ Check Amount to Words Converter Convert a numeric amount into the words format required on a check. No tools found.