120+ 款完全在浏览器中运行的免费工具，任何内容都不会上传到服务器。
120 工具
Count words, characters, sentences, paragraphs and estimated reading time in real time.
Create a QR code from any text, URL or link and download it as a PNG.
Scan and decode QR codes from an image file or your device camera.
Create a QR code that lets guests connect to your WiFi by scanning it.
Turn your contact details into a scannable vCard QR code.
Generate barcodes (CODE128, EAN, UPC and more) and download them as SVG.
Crop images to a selection right in your browser and download the result.
Resize images to exact dimensions while optionally keeping the aspect ratio.
Reduce image file size in your browser with adjustable quality.
Convert images between PNG, JPG and WebP formats in your browser.
Rotate images by 90° and flip them horizontally or vertically.
Convert an image into a Base64 data URI you can paste into code.
Decode a Base64 string or data URI back into a viewable, downloadable image.
Pick the exact hex color of any pixel in an image.
Extract the dominant colors from an image as a hex palette.
Generate favicon images in all common sizes from a single image.
Add a text watermark to an image with adjustable position and opacity.
Generate random numbers in any range, with optional unique values.
Roll any number of dice with a custom number of sides.
Flip a virtual coin and track heads/tails counts.
Spin a customizable wheel to randomly pick a name or entry.
Pick a random item from a list you paste.
Split a list of names into balanced random teams.
Generate random hex colors and copy them with one click.
Get a random yes, no or maybe answer to any question.
Shuffle a list of lines into a random order.
Generate a random date between two dates.
Convert text between UPPER, lower, Title, camelCase, snake_case and more.
Generate placeholder lorem ipsum paragraphs for mockups.
Compare two texts and highlight added and removed lines.
Delete duplicate lines from text, keeping the first occurrence.
Turn any text into a clean, URL-friendly slug.
Reverse text by characters, words or lines.
Find and replace text, with optional regex and case-insensitive matching.
Convert length, weight, area, volume and speed between units.
Convert temperatures between Celsius, Fahrenheit and Kelvin.
Convert colors between HEX, RGB and HSL and preview them live.
Convert numbers between binary, octal, decimal and hexadecimal.
Convert between Arabic numbers (1–3999) and Roman numerals.
Convert between B, KB, MB, GB, TB and PB.
Convert a date and time from one time zone to another.
See the current time across major cities and time zones.
Set a countdown timer with start, pause and reset.
A precise stopwatch with lap times.
Calculate your exact age in years, months and days.
Find the difference between two dates in years, months and days.
Convert Unix timestamps to human-readable dates and back.
Focus with 25-minute work sessions and 5-minute breaks.
Count the number of days between two dates.
Find the ISO 8601 week number for any date.
Format, beautify and minify JSON with validation.
Validate JSON and see the exact syntax error.
Convert a JSON array of objects into CSV.
Convert CSV into a JSON array of objects.
Convert YAML into formatted JSON.
Convert JSON into YAML.
Pretty-print XML with indentation.
Format and beautify SQL queries.
Test regular expressions against sample text.
Translate cron expressions into plain English.
Write Markdown and see a sanitized live preview.
Minify HTML by removing comments and whitespace.
Minify CSS by removing comments and whitespace.
Basic JS minify — remove comments and blank lines.
Compare two texts and see added/removed lines with counts.
Encode text to Base64 or decode Base64 to text.
Percent-encode or decode URL components.
Escape or unescape HTML entities.
Decode a JWT to view its header and payload.
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes.
Generate random UUID v4 identifiers.
Generate strong random passwords with custom rules.
Hash text with bcrypt at a chosen cost factor.
Calculate percentages, percentage-of, and percentage change.
Calculate Body Mass Index from weight and height.
Calculate monthly loan payments, total interest and total paid.
Calculate a tip and split the bill between people.
Calculate the sale price and amount saved.
Reduce width and height to a simplified aspect ratio.
Calculate a credit-weighted grade point average.
Evaluate math expressions with functions and constants.
Combine multiple PDF files into one.
Extract a page range from a PDF into a new file.
Convert PDF pages into downloadable PNG images.
Combine JPG/PNG images into a single PDF.
Generate SEO meta tags for your web page.
Preview and generate Open Graph social tags.
Build campaign URLs with UTM parameters.
Generate a robots.txt file for your site.
Generate a sitemap.xml from a list of URLs.
A simple notepad that autosaves in your browser.
Preview an image as seen with color vision deficiencies.
Compare two JSON objects and see what changed.
Generate TypeScript interfaces from a JSON sample.
Break a URL into its parts and query parameters.
Escape or unescape text for JSON and JavaScript strings.
Convert CSV data into a Markdown table.
Strip accents and diacritics from text (Vietnamese friendly).
Count how often each word appears in your text.
Sort lines alphabetically, by length, or reverse them.
Trim lines, collapse spaces and remove blank lines.
Repeat text a number of times with a chosen separator.
Create a solid-color placeholder image with custom size and text.
Convert SVG markup to a raster PNG at any scale.
Add top and bottom captions to an image, meme-style.
Add a solid colored border or frame around an image.
Add rounded corners to an image with transparency.
Project savings growth with compounding and contributions.
See how many months to reach a savings target.
Add or remove VAT/GST from an amount.
Estimate BMR and daily calories (TDEE).
Compare price per unit to find the best value.
Compress JSON by removing whitespace.
Build a URL with encoded query parameters.
Translate text to and from Morse code.
Spell text using the NATO phonetic alphabet.
Convert an image to grayscale or sepia.
Add a pixelated / mosaic effect to an image.
Calculate simple interest and total amount.
Estimate the fuel cost of a trip.