Free online tools directory
Browse 55 tools for documents, images, SEO, text, development and calculations. Each link opens a working utility with instructions.
SEO tools
Review page source, headings, links and readability, or build campaign URLs and sitemap XML. Pasted-source checks do not crawl live websites.
SEO URL InspectorInspect URL structure, hostname, length, path and tracking parameters locally.Internal & External Link AuditorInspect hyperlinks, external destinations, nofollow tags and broken local fragment targets in pasted HTML.Image Alt Text AuditorFind images in pasted HTML with missing, empty or descriptive alt attributes.Readability CheckerEstimate English reading ease and grade level with the Flesch formulas. Estimates, not Google ranking factors.Keyword Frequency AnalyzerCount top words and 2–3 word phrases in text, with optional exact keyword frequency. Not a ranking score.H1–H6 Heading Structure CheckerInspect heading hierarchy, missing H1s, empty headings and skipped levels in a pasted HTML document.Meta Tag AnalyzerAnalyze title, description, canonical, robots and social metadata from pasted HTML source. No remote crawler required.Google SERP Snippet PreviewPreview a search result title, URL and description as you write them. Google’s actual display can differ.UTM Campaign URL BuilderBuild campaign links with source, medium and campaign tags while preserving existing URL parameters and fragments.XML Sitemap GeneratorGenerate sitemap XML from a list of public page URLs with optional honest last-modified dates.Robots.txt GeneratorCreate a simple robots.txt draft with path exclusions and an optional sitemap URL.
PDF tools
Combine documents, extract a page range, rotate pages and turn JPG or PNG images into a PDF. Processing uses pdf-lib in your browser. Encrypted files and complex PDF features may be unsupported.
Images to PDF ConverterTurn JPG and PNG images into a PDF file. Work with files locally in your browser.Rotate PDF PagesRotate all pages of a PDF by 90, 180 or 270 degrees. Work with files locally in your browser.Extract PDF PagesExtract a range of pages from a PDF into a new file. Work with files locally in your browser.Merge PDF FilesCombine multiple PDF files into one downloadable document. Work with files locally in your browser.
Image tools
Resize, inspect and convert common image files in your browser. Converting to JPG removes transparency; exported images may lose metadata or animation.
Image Dimensions CheckerFind image dimensions, file size and MIME type instantly without uploading.Image to WebP ConverterConvert JPG and PNG images to WebP with customizable output quality.JPG to PNG ConverterConvert JPEG images into PNG format locally in your browser.PNG to JPG ConverterConvert PNG pictures to JPEG in your browser without uploading your images.Compress Image OnlineCompress images to JPEG with adjustable quality. Transparent areas become white.Resize Image OnlineResize JPG, PNG and WebP images by width and height, directly in your browser.
Text tools
Count words, change case, clean whitespace and organize text. These tools operate on the text you paste and show a result you can copy.
Find and Replace TextReplace all occurrences of a word or phrase in your text. No signup required.HTML Tag RemoverExtract readable text from HTML markup. No signup required.URL Slug GeneratorTurn a title into a clean URL-friendly slug. No signup required.Remove Extra SpacesClean repeated spaces and unnecessary blank lines from text. No signup required.Reverse TextReverse characters in a text string. No signup required.Sort Lines AlphabeticallySort text lines in alphabetical order. No signup required.Remove Duplicate LinesRemove repeated lines from a list while preserving their original order. No signup required.Case ConverterConvert text to uppercase, lowercase, title case or sentence case. No signup required.Word CounterCount words, characters, sentences and lines instantly. No signup required.
Developer tools
Format JSON, encode text, inspect structured data and generate identifiers. Encoding is reversible and does not encrypt secrets.
HTML Entity EncoderSafely encode special characters in text as HTML entities. For example, an ampersand becomes & and a less-than sign becomes <.Password GeneratorGenerate a random 20-character password. Runs locally in your browser, without an account.SHA-256 Hash GeneratorCreate a SHA-256 hash from text using your browser. No signup required.UUID GeneratorGenerate a random version 4 UUID in your browser. No signup required.HTML Entity DecoderDecode HTML entities into readable characters. No signup required.URL DecoderDecode percent-encoded URL text. No signup required.URL EncoderPercent-encode text for use in URLs. No signup required.Base64 DecoderDecode Base64 strings back into readable text. No signup required.Base64 EncoderEncode UTF-8 text into Base64. No signup required.JSON ValidatorValidate JSON syntax and identify parsing errors. No signup required.JSON MinifierRemove unnecessary spaces from valid JSON. No signup required.JSON FormatterFormat and pretty-print JSON with readable indentation. No signup required.JSON-LD Syntax InspectorCheck JSON-LD syntax and inspect top-level contexts and types from raw JSON or pasted HTML.
Online calculators
Calculate percentages, dates, margins and fixed-rate loan payments. Results depend on the values you enter; verify estimates before making decisions.
Loan CalculatorEstimate monthly payments on a fixed-rate loan. Runs locally in your browser, without an account.Age CalculatorCalculate age from date of birth. Runs locally in your browser, without an account.Date Difference CalculatorCalculate days between two dates. Runs locally in your browser, without an account.VAT CalculatorCalculate VAT amount and total price. Runs locally in your browser, without an account.Profit Margin CalculatorCalculate profit and gross margin. Runs locally in your browser, without an account.Percentage Change CalculatorCalculate percentage change between two values. Runs locally in your browser, without an account.Percentage CalculatorCalculate a percentage of a number. Runs locally in your browser, without an account.
Unit and color converters
Convert lengths, temperatures, file sizes and color values. Read each tool’s units carefully; file size units here use a 1024-byte scale.
HEX to RGB ConverterConvert hexadecimal colors to RGB values. Runs locally in your browser, without an account.RGB to HEX ConverterConvert RGB color components to hexadecimal. Runs locally in your browser, without an account.File Size ConverterConvert bytes to KB, MB, GB and binary units. Runs locally in your browser, without an account.Length ConverterConvert meters to feet, inches, kilometers and miles. Runs locally in your browser, without an account.Temperature ConverterConvert Celsius to Fahrenheit and Kelvin. Runs locally in your browser, without an account.