Free URL Tools Online

Encode, decode, parse, build, generate and clean URLs instantly, privately, in your browser.

• Barcode GeneratorCreate Code 128, UPC-A, EAN-13 and Code 39 barcodes from any text — ready to download as PNG or SVG.
• Base64 URL EncoderTurn text into a URL-safe base64 string — no padding, no + or / characters — i…
• Color ConverterConvert colors between HEX, RGB and HSL instantly. Paste any color and see the other two formats plus a live swatch. Free, private, runs in your browser.
• Contrast CheckerCheck the WCAG contrast ratio between any foreground and background color. See AA/AAA pass or fail for normal and large text, with a live preview.
• Credit Card ValidatorRun a Luhn checksum on any card number to see if it is valid, then detect whether it is a Visa, Mastercard or American Express. Instant, private and free.
• Cron Expression Generator & Maker - FreeBuild a cron expression from schedule fields and validate it online. Preview the next run time and a plain-English description. Free, in your browser.
• CSV to JSON ConverterConvert CSV with a header row to JSON (objects or arrays) — free, in your browser.
• CSV to TSV Converter Online - FreeConvert CSV to TSV and back online for free. Paste CSV or TSV, pick the direction, convert and download. Private, in your browser.
• Data URI BuilderTurn any text or URL into a base64 data: URI — choose a MIME type and copy the…
• Domain ExtractorPaste a URL or a block of text with emails to pull every unique domain and hos…
• Hash GeneratorGenerate MD5, SHA-1, SHA-256 and SHA-512 hashes for any text instantly. Uses the browser Web Crypto API — private, free, no uploads, no signup.
• HTML Entity EncoderConvert text into safe HTML entities, or decode entities back into readable te…
• HTML to Markdown ConverterPaste HTML and convert it to clean Markdown instantly. Handles headings, bold, italic, links, lists, code and images — free, private, in your browser.
• HTTP to HTTPS ConverterFree http to https converter. Paste a list of URLs and get every secure https://…
• IP Subnet CalculatorEnter an IPv4 address and CIDR prefix to see its subnet mask, network, broadcast and usable host range. Instant, accurate, private and free.
• JSON to CSV Converter OnlineConvert a JSON array of objects to CSV instantly. Paste JSON, see the CSV output, then download the .csv file or copy it — free, in your browser.
• JWT DecoderPaste a JSON Web Token to read its header and payload as formatted JSON, plus …
• Markdown to HTML ConverterConvert Markdown to clean HTML with a live preview — headings, lists, code blocks and tables.
• Number Base ConverterConvert between decimal, binary, octal and hexadecimal instantly.
• Password GeneratorCreate a strong, random, secure password with the length and characters you choose.
• Password Strength CheckerCheck any password's strength in real time. Get entropy bits, a strength score, and clear tips to make it stronger. Free, private, in your browser.
• Punycode ConverterConvert an international (Unicode) domain to its punycode xn-- form, or conver…
• QR Code GeneratorGenerate a free QR code from any text or URL. Pick a size, download the PNG or copy the link. Runs in your browser — private, instant, no signup.
• Query String ParserPaste a URL or query string to see every parameter and value in a clean, decod…
• Regex TesterTest regular expressions with live match highlighting and capture groups, in your browser.
• Roman Numeral ConverterConvert any number to Roman numerals and Roman numerals back to a number. Instant, accurate and private — works in your browser with nothing uploaded.
• Sitemap GeneratorPaste your URLs one per line to generate a valid sitemap.xml you can copy or d…
• Subdomain ExtractorFree subdomain extractor. Paste a list of URLs or domains to pull out the www or…
• Text Diff CheckerCompare two texts line by line. Paste or type the original and changed versions, click Compare, and see added and removed rows highlighted — free, in your browser.
• Text to Binary ConverterConvert text to binary and back instantly. Turn any words into ASCII binary (0s and 1s) or decode binary to readable text, free and in your browser.
• Timezone ConverterConvert a time between time zones instantly. Pick a from and to zone, enter an HH:MM time, and see the converted local time — free, in your browser.
• Trim to Root DomainFree tool to trim a URL to its root domain. Remove scheme, subdomains, path, que…
• Unicode ConverterConvert any text into Unicode code points, HTML entities and ASCII codes. See each character's U+ hex value, then copy. Private and free.
• Unix Timestamp ConverterConvert a Unix epoch timestamp to a human date and back. Enter seconds or milliseconds and see UTC and local time, or enter a date to get the epoch.
• URL Encoder & DecoderPercent-encode text into a safe URL, or decode it back — instantly, in your br…
• URL Parameter BuilderAdd key=value pairs to build a clean, percent-encoded query string and full UR…
• URL ParserPaste any URL to break it into protocol, host, path, query parameters and hash…
• URL Slug GeneratorTurn any title into a clean, SEO-friendly URL slug — lowercase, hyphenated, no…
• URL ValidatorPaste any string to check if it is a valid http or https URL and see its parts…
• UTM BuilderPaste your URL, fill in the tracking tags and get a ready-to-share link with U…
• UTM CleanerPaste any tracking URL to strip utm_*, gclid, fbclid and other tracking parame…
• UUID / GUID GeneratorGenerate random UUID v4 (GUID) values instantly, privately, in your browser.
• XML Formatter & Validator - Pretty Print OnlinePretty-print and validate XML online for free. Beautify XML with clean indentation and find the exact error line and column. Private, in your browser.
• YAML to JSON Converter Online - FreeConvert YAML to JSON online for free. Paste YAML, get clean formatted JSON instantly, then copy it. Private, in your browser.