# Show HN: CodeKitHub – Free browser-based tools, files never leave your device > Source: > Published: 2026-07-19 06:32:30+00:00 # 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.