Converters — 38 Free Online Tools
38 free online converters. No signup required.
Convert between units, formats, encodings, and time zones. All common units, instant conversion with no server processing.
Need a JSON formatter online or an image compressor free? DevTools Hub has both, plus 279 free online developer tools that run entirely in your browser. Converters are free online developer tools you can use instantly — no signup, no upload, 100% private. Popular free tools in this category include a free online Base64 encoder and decoder, a unit converter, a text case converter, or an image format converter — all free to use online, no signup required. DevTools Hub is a collection of 279 free online developer tools that run entirely in your browser — no signup, no upload, no watermark. Popular tools across the whole site include a free JSON formatter online, a free image compressor free, a free online video compressor, and a free online calculator.
AES Encrypt Decrypt - Secure Text Online
Free AES-256-GCM encryption tool. Encrypt text with a password using PBKDF2 and Web Crypto, or decrypt it. Runs in your browser, nothing is uploaded.
Aspect Ratio Calculator - Free Online Tool
Free aspect ratio calculator. Calculate aspect ratio from width and height, find missing dimensions, visual preview of 16:9, 4:3, 21:9 ratios. Social media presets for YouTube, Instagram, TikTok, Twitter. 100% private.
Barcode Scanner - Decode EAN, UPC, Code 128, QR Codes
Free online barcode scanner. Decode EAN-13, UPC-A, Code 128, Code 39, QR codes and 15+ formats from images or camera. 100% private, no upload, no signup. AI cannot scan barcodes - we do.
Base64 Encoder/Decoder - Encode Data
Free online Base64 encoder and decoder. Encode text to Base64 or decode Base64 back to plain text instantly in your browser. Private, no upload, no signup.
Base64 to Image Converter - Convert Base64 String to Image
Convert base64 strings and data URIs to viewable images. Supports PNG, JPG, WebP, GIF, BMP. 100% private, browser-based, no upload required.
Color Blindness Simulator - CVD Test
Free color blindness simulator. Test images and colors with 8 types of color vision deficiency (protanopia, deuteranopia, tritanopia, achromatopsia). WCAG accessibility tool for designers and developers. No signup, 100% private browser processing.
Color Contrast Checker - WCAG AA AAA Accessibility Checker
Free WCAG color contrast checker. Check AA and AAA accessibility for text and background colors. Real-time ratio, live preview, pass/fail results. No signup.
Color Palette Generator - Create Harmonious Color Schemes
Free color palette generator. Create harmonious schemes with 7 harmony rules. Export as CSS, Tailwind, SCSS, JSON. Lock colors, WCAG checker. No signup.
Color Picker - HEX RGB HSL Converter
Free online color picker. Pick colors and convert between HEX, RGB, and HSL formats with live color preview and instant copy. No signup required, 100% free.
CSS to Tailwind Converter - Free Online CSS to Utility Classes
Free CSS to Tailwind converter. Convert any CSS properties to Tailwind utility classes instantly. Supports 100+ properties including layout, flexbox, grid, typography, colors, borders. No signup, 100% private browser processing.
Excel Viewer & Converter - Free Online XLSX Viewer
Free online Excel viewer and converter. View XLSX, XLS, CSV files without Excel. Convert to JSON or CSV. 100% private, no upload, no signup.
File Opener - Open APK, RAR, DLL, DAT, BIN Online
Free online file opener. Detect, view, and extract 50+ file types (APK, RAR, ZIP, DLL, DAT, BIN, DOCX) using magic numbers. Browser-only, no upload, 100% private. AI cannot parse real binary files - we do.
Free Binary Hex Converter - Convert Binary to Decimal, HEX, ASCII
Free online binary hex converter. Convert between binary, decimal, hex, and ASCII text. Instant conversion, no upload needed. Developer tool for encoding.
Free Case Converter - Convert Text Case Online
Free online case converter. Convert text to uppercase, lowercase, title case, sentence case, camelCase, snake_case, kebab-case, and more. Instant results.
Free Color Palette Extractor - Extract Colors from Image
Free online color palette extractor. Extract dominant colors from any image as HEX, RGB, HSL values. Download CSS variables or JSON. No signup required.
Free Markdown Editor & Preview - Live MD to HTML Converter
Free online markdown editor with live HTML preview. Write markdown, see rendered output instantly. GitHub Flavored Markdown, syntax highlighting, copy HTML. No signup, 100% private browser processing. AI cannot render live markdown previews - we do.
Free Time Zone Converter - World Clock
Free time zone converter. Convert time between cities instantly. See current time in multiple locations. No signup required.
Free Unit Converter - Convert Length, Weight, Temperature & More
Free online unit converter. Convert between length, weight, temperature, volume, speed, area, data, time, and pressure units instantly. No signup required.
Free URL Shortener - Shorten Long Links Instantly
Free URL shortener. Shorten long links instantly with no signup. Create clean, shareable short URLs for social media, messaging, and more.
HEIC to JPG Converter - Free iPhone Photo Converter
Free online HEIC to JPG converter. Convert iPhone HEIC photos to JPEG instantly. Batch convert unlimited photos. No upload, 100% private, browser-based.
HTML Entity Encoder/Decoder - Encode & Decode Special Characters
Free online HTML entity encoder and decoder. Encode special characters like &, <, > and quotes to HTML entities, and decode them back. 100% private, no signup.
HTML to Markdown Converter - Free Online Tool
Free HTML to Markdown converter. Paste HTML, get clean Markdown with customizable heading style, bullet markers, code blocks, and link format. 100% private browser processing.
Image Color Picker - Pick Colors from Photo Online
Free online image color picker. Upload any photo and click to pick exact pixel colors. Get HEX, RGB, HSL, CMYK values. No upload, 100% private browser processing. AI cannot extract pixel colors from images - we do.
Image to Base64 Converter - Encode Images Online
Free online image to base64 converter. Convert any image to base64 string, data URI, HTML img tag, or CSS url(). Supports PNG, JPG, WebP, GIF, SVG. 100% private, no upload.
Image to Word Converter - Free JPG PNG to DOCX Online
Free image to Word converter. Convert JPG, PNG, WebP to editable DOCX, RTF, TXT. 12+ OCR languages. 100% private browser. AI cannot generate DOCX.
JSON to CSV Converter - Bidirectional Online Data Converter
Free JSON to CSV converter and CSV to JSON online. Flatten nested objects, auto-detect input, table preview, export file. 100% private browser processing. AI cannot convert data reliably - we do.
JSON to TypeScript Converter - Free Online Type Generator
Free JSON to TypeScript converter. Generate TypeScript interfaces, types, and Zod schemas from any JSON. 100% private browser tool. No upload, no signup.
JSON to XML Converter - Free Bidirectional Online Tool
Free JSON to XML converter and XML to JSON. Bidirectional with attribute handling, root element control, indentation options, and syntax validation. 100% private, no upload, no signup. AI cannot convert between JSON and XML reliably - we do.
JSON to YAML Converter - Free Bidirectional Tool
Free JSON to YAML converter and YAML to JSON. Bidirectional with indentation control, key sorting, syntax validation. 100% private, no upload, no signup.
Number to Words Converter - Spell Out Numbers in English
Free number to words converter. Convert any number to English words for checks, invoices, legal docs. Supports decimals, currency, lakh/crore. 100% accurate. No signup.
QR Code Reader - Decode QR Codes from Image & Camera
Free online QR Code Reader. Decode QR codes from images, screenshots, or live camera. Extract URLs, WiFi passwords, vCards instantly. 100% private browser processing. No signup. AI cannot scan real QR codes - we do.
Roman Numeral Converter - Free Online Number Tool
Free Roman numeral converter. Convert numbers to Roman numerals and back, including dates. Supports 1-3,999,999 with overline notation. 100% accurate, no signup.
SVG to JSX Converter - Free React Component Generator
Convert SVG markup into clean React JSX or TypeScript components with camelCase attributes, forwardRef, React.memo. 100% browser-based, no upload. AI cannot convert SVG to JSX reliably — we do.
SVG to PNG Converter - Free Online SVG Rasterizer
Free SVG to PNG converter. Rasterize SVG vectors to PNG, JPG, WebP with scale control, custom dimensions, background color. Paste SVG code or upload files. 100% browser-based, no upload, no signup. AI cannot rasterize SVG — we do.
Text Cleaner - Remove Line Breaks, Spaces & HTML Tags
Free online text cleaner. Remove line breaks, extra spaces, HTML tags, duplicate lines, and clean messy text with 20+ deterministic options. No signup, 100% private browser processing. AI cannot clean text deterministically - we do.
Text to EPUB Converter - Free Online TXT MD HTML to eBook
Free text to EPUB converter. Turn text, Markdown, or HTML into EPUB 3.0 eBooks in your browser. Custom cover, TOC, 40+ languages. AI cannot make EPUB.
Timestamp Converter - Unix Time Conversion
Convert Unix timestamps to dates and dates to timestamps. Shows current timestamp updating in real-time.
URL Encoder/Decoder - Encode URLs Safely
Free URL encoder and decoder. Encode special characters in URLs for safe web transmission. Decode encoded URLs back to readable text. 100% browser-based.
Frequently Asked Questions
4 Q&AHow many format converters are available?
Thirty-three converters handle encoding (Base64, URL, HTML entities), data formats (JSON↔CSV, JSON↔YAML, JSON↔XML, JSON↔TypeScript), colors (hex, RGB, HSL, palette extraction, contrast checking), images (HEIC→JPG, SVG→PNG, Base64↔image), text (case conversion, number to words, text cleaning, Roman numerals), and utilities (unit converter, time zone, timestamp, URL shortener, CSS→Tailwind, HTML→Markdown, SVG→JSX, Excel viewer, file opener, color picker, aspect ratio).Are the conversions done server-side or in my browser?
All converters run in your browser. No data is uploaded to any server. Color palette extraction, image processing, encoding, and format transformation use client-side JavaScript only. The URL shortener is the sole exception — it stores the mapping in Cloudflare KV.Can I convert sensitive data with these tools?
Yes. Since all conversion logic runs locally in your browser, sensitive JSON payloads, API keys, and private configuration files never leave your device. Close the tab and everything is erased. For maximum security, use the tools in incognito mode.Do the color and image converters preserve quality?
HEIC to JPG conversion uses the browser's native canvas API with configurable quality (1-100). SVG to PNG rendering respects vector precision at any resolution up to 4096px. Color palette extraction analyzes every pixel with k-means clustering. No loss beyond the standard codec compression you choose.How to Use These Converter Tools
guideEvery converter tool below runs entirely in your browser — no signup, no upload, no watermark. To find a specific tool, type a name, keyword, or scenario into the search box and the list filters instantly. Popular converter tools are linked in the summary at the top; click any card or link to open the tool and follow the on-screen instructions. Hover any tool card to read its full description, then click its name or button to open it.