Converters — 44 Free Online Tools
Convert units, currencies, time zones, file formats and text encodings in a single click. Deterministic formulas run locally, with no server roundtrip.
Conversion is only trustworthy when the arithmetic is visible, so each of these shows how it got the answer instead of hiding it behind a server. The Unit Converter covers length, mass, temperature and volume, the Timestamp Converter reads Unix time in both directions including milliseconds, and the JSON to CSV Converter and its siblings run both ways, so you can paste a fragment back the other direction.
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.
APCA Contrast Checker - WCAG 3 Lc Calculator
Free APCA contrast checker for WCAG 3. Get the Lc value, the minimum Lc your font size and weight need, the WCAG 2.1 ratio, and a passing color fix.
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.
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.
Base64 Encoder/Decoder - Encode Data
Free Base64 encoder and decoder. Encode text to Base64 and decode back. Works entirely in your browser with no upload and no signup. 100% private.
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.
Binary Hex Converter - 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.
Color Blindness Simulator - CVD Test
Free color blindness simulator. Test how images and colors appear with 8 types of color vision deficiency (protanopia, deuteranopia, tritanopia). WCAG.
Color Contrast Checker - WCAG AA AAA
Free WCAG color contrast checker. Check if text and background colors meet AA and AAA accessibility standards. Real-time contrast ratio, pass/fail.
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
Pick colors and convert between HEX, RGB, and HSL formats with live preview and copy buttons. Free, browser-based, 100% private.
CSS to Tailwind Converter - Free Online Tool
Free CSS to Tailwind converter. Convert CSS properties to Tailwind utility classes instantly. 100+ properties supported.
CSV to SQL INSERT Generator - DDL, Batches, Upserts
CSV, Excel or JSON to CREATE TABLE plus batched INSERT statements for PostgreSQL, MySQL, SQLite, SQL Server and Oracle, with a data quality report first.
Excel Formula Translator - #NAME? Fixer & Function Names
Translate an Excel formula between 17 spreadsheet languages and find the #NAME? cause. Function names, argument separators and a 490-function reference.
Excel Viewer - Free Online XLSX Viewer & Converter
Free online Excel viewer and converter. View XLSX, XLS, CSV files without Excel. Convert to JSON, CSV format. 100% private browser processing, no upload.
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.
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 Time Zone Converter - World Clock
Free time zone converter. Convert time between cities instantly. See current time in multiple locations. 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 in your browser. Batch convert unlimited photos. No upload, 100% private.
HTML Entity Encoder and Decoder - Encode Special
Free online HTML entity encoder and decoder. Encode special characters like &, <, > and quotes to HTML entities, and decode them back. 100%.
HTML to Markdown Converter - Free Online Tool
Free HTML to Markdown converter. Paste HTML, get clean Markdown. Supports tables, code blocks, links, images, nested lists, heading styles, and more. 100%.
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 instantly. No upload, 100% private.
Image to Base64 Converter - Encode Images Online Free
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. 100%.
Image to Excel Converter - Free JPG PNG to XLSX Online
Free image to Excel converter. Convert JPG, PNG, WebP, HEIC photos, scanned tables and screenshots to editable XLSX. Auto-detect rows and columns.
Image to Word Converter - Free JPG PNG to DOCX Online
Free image to Word converter. Convert JPG, PNG, WebP, GIF, BMP, HEIC photos into editable DOCX, RTF, or TXT. 12+ languages, batch OCR, 100% private.
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.
JSON to TypeScript Converter - Free Interface Types
Free JSON to TypeScript converter. Generate TypeScript interfaces, types, and Zod schemas from JSON. Deterministic output, no hallucination. 100% private.
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, syntax validation. 100%.
JSON to YAML Converter - Free Online Tool
Free JSON to YAML converter and YAML to JSON. Bidirectional with indentation control, key sorting, and syntax validation. 100% private, no upload.
Markdown Editor and Preview - Live MD to HTML
Free online markdown editor with live HTML preview. Write markdown, see rendered output instantly. GitHub Flavored Markdown, syntax highlighting.
Number to Words Converter - Free Online Tool
Free number to words converter. Convert any number to English words instantly. Spell out numbers for checks, invoices, legal documents. Supports decimals.
QR Code Reader - Decode QR Codes from Image & Camera
Free online QR code reader. Decode QR codes from images, screenshots or a live camera. Extract URLs, WiFi passwords and vCards. 100% private, no signup.
Resistor Color Code Calculator - 4 & 5 Band
Free resistor color code calculator. Read 3, 4, 5 and 6 band resistors to value, tolerance and TCR. Reverse a value into bands and E24/E96 values.
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. No signup.
Size Converter - Shoe, Ring & Apparel Sizes
Free online size converter for shoe, ring, bra, clothing. 9-country systems + sister-size bra calculator. ISO 9407 + 8655. 100% private.
SVG to JSX Converter - Free React Component Generator
Convert SVG to React JSX component online free. Paste SVG code, get clean React/TypeScript components with camelCase attributes, forwardRef, memo. 100%.
SVG to PNG Converter - Free Online SVG Rasterizer
Convert SVG to PNG free online. Rasterize vector graphics to PNG, JPG, WebP with custom dimensions, scale control, background color. 100% browser-based.
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.
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 back to timestamps, in seconds, milliseconds or ISO 8601. The current time ticks live. No signup required.
Unit Converter - Length, Weight, Temperature and More
Free online unit converter. Convert between length, weight, temperature, volume, speed, area, data, time, and pressure units instantly. No signup required.
URL Encoder/Decoder - Encode URLs Safely
Free URL encoder and decoder. Percent-encode special characters or decode them back, with a live character reference and one-click copy. No signup.
Frequently Asked Questions
4 Q&AHow many format converters are available?
There are 44 converters handling 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, 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.