Word and Character Counter
Count words, characters, lines, paragraphs, and reading time instantly. CJK-aware counting with live stats as you type.
Local processingKivolune
Useful tools, right in your browser.
What is Kivolune?
Kivolune is a set of practical tools you can open in a modern browser and use right away—for files, text, data, and everyday conversions—without creating an account.
What you can work on
Browse tools by category: text cleanup and comparison, image editing, PDF merge and split, data and developer helpers (JSON, CSV, XML, and more), password and QR utilities, plus unit, date, percentage, and time-zone calculators.
- Text Tools (12)
- Image Tools (12)
- Data & Developer Tools (14)
- Security & Utilities (8)
- PDF Tools (6)
- Calculators & Converters (5)
Browser-based processing
Whenever technically possible, tools process your input and files in your browser rather than uploading them to run the tool. Preferences such as language, theme, and pins stay in this browser. Processing success still depends on your device, file size, and browser limits.
How to get started
Search for a tool by name, filter the list by category, or open a category page. Then open a tool and start working—no signup required for general use.
All tools
Case Converter
Convert text to uppercase, lowercase, title case, camelCase, snake_case, kebab-case, and more naming formats in one click.
Local processingText Cleaner
Trim lines, collapse whitespace, strip HTML tags, remove blank lines, normalize line endings, and run find/replace on messy text.
Local processingDuplicate Line Remover
Remove duplicate lines from lists with keep-first or keep-last, optional case-insensitive matching, and whitespace trimming.
Local processingSlug Generator
Turn titles into URL-friendly slugs with hyphen, underscore, or dot separators. Optional Unicode preservation for multilingual URLs.
Local processingText Compare
Diff two texts by lines, words, or characters with side-by-side or unified view. Ignore case, whitespace, blank lines, or punctuation.
Local processingList Converter
Convert between plain line lists, comma-separated values, JSON arrays, and quoted formats. Trim entries and remove empties.
Local processingText Sorter
Sort lines alphabetically ascending or descending with optional case-insensitive order, numeric sort, and duplicate removal.
Local processingMarkdown Preview
Preview Markdown as you type with common GitHub Flavored Markdown (GFM) syntax. Dangerous HTML tags and attributes are removed from the output.
Local processingRegex Tester
Test JavaScript regular expressions against sample text with live match highlighting, capture groups, and flag controls.
Local processingRandom Picker
Randomly pick winners from a list using cryptographically secure randomness. Support multiple draws, exclude picked items, and import line lists.
Local processingSubtitle Toolbox
Edit SRT and WebVTT subtitle files by shifting timings, adjusting playback speed, converting formats, joining short entries, and finding overlaps.
Local processingJSON Formatter and Validator
Format, compress, and validate JSON. See the exact location of syntax errors and optionally sort object keys.
Local processingJSON Compare
Compare two JSON documents and see added, removed, or changed keys and values in a structured view.
Local processingCSV Viewer
Open a CSV file and view it as a sortable table in your browser, with separator detection, optional column names, and row and column counts.
Local processingCSV JSON Converter
Convert CSV data to JSON or convert tabular JSON data to CSV. Choose the separator, quotation handling, and whether the first row contains column names.
Local processingXML Formatter
Pretty-print and minify XML with syntax validation, indent control, and parse error line hints.
Local processingYAML JSON Converter
Convert YAML to JSON or JSON to YAML. See clear syntax errors and copy or download the formatted result.
Local processingBase64 Encoder and Decoder
Encode and decode text and small files to Base64 or Base64URL. Inspect byte length and copy results for data URLs or APIs.
Local processingURL Encoder, Decoder, and Analyzer
Encode or decode a URL and separate it into its protocol, host name, port, path, query parameters, and fragment.
Local processingJWT Decoder
Decode JWT header and payload JSON locally. Signature is NOT verified—safe inspection of exp, iss, and claims.
Local processingUUID Generator
Generate one or more UUID version 4 identifiers using cryptographically secure randomness in your browser.
Local processingHash Generator
Calculate SHA-256 and SHA-512 checksums for UTF-8 text and local files directly in your browser.
Local processingUnix Timestamp Converter
Convert Unix timestamps in seconds or milliseconds into local and UTC dates, or convert a date back into a Unix timestamp.
Local processingCron Expression Explainer
Explain a cron expression and list its next scheduled run times. Supports common five-field expressions and six-field expressions with seconds.
Local processingCode Formatter
Format JavaScript, TypeScript, HTML, CSS, and JSON with consistent indentation and line breaks.
Local processingPassword Generator
Generate strong random passwords or memorable passphrases using cryptographically secure randomness in your browser.
Local processingPassword Strength Checker
Check the length, variety, common patterns, and estimated strength of a password directly in your browser.
Local processingRandom String Generator
Generate cryptographically secure hexadecimal, alphanumeric, or URL-compatible random strings. Choose a preset or define your own character set.
Local processingFile Checksum Calculator
Calculate a SHA-256 or SHA-512 checksum for a local file and compare it with a value supplied by the file publisher.
Local processingQR Code Generator
Create QR codes for URLs, plain text, Wi-Fi, email, and phone numbers. Export PNG or SVG locally.
Local processingQR Code Reader
Read a QR code from an image or your device camera. View the decoded text or address before choosing whether to open it.
Local processingColor Converter and Contrast Checker
Convert colors between HEX, RGB, HSL, and HSV and check text contrast against WCAG requirements.
Local processingScreen and Browser Information
View the browser's visible area, screen resolution, device pixel ratio, language, time zone, and User-Agent information to help investigate display issues.
Local processingUnit Converter
Convert length, area, mass, volume, temperature, speed, and digital storage units directly in your browser.
Local processingDate Calculator
Calculate the number of days between two dates or add and subtract days, weeks, months, and years.
Local processingPercentage Calculator
Calculate a percentage of a number, percentage increases and decreases, percentage change, or an original value before a discount.
Local processingRandom Number Generator
Generate one or more random integers or decimal numbers within a chosen range, with optional unique results.
Local processingTime Zone Converter
Convert a date and time between time zones and compare the local time in several regions.
Local processingImage Compressor
Reduce the size of JPEG, WebP, and PNG images directly in your browser. Adjust JPEG and WebP quality, remove metadata, and process several images at once.
Local processingImage Resizer
Resize images by pixel dimensions or percentage with aspect ratio lock. Export JPEG, PNG, or WebP.
Local processingImage Format Converter
Convert images between JPEG, PNG, and WebP in your browser with optional quality settings for JPEG and WebP.
Local processingImage Cropper
Crop images with an adjustable selection, fixed aspect ratios, and JPEG/PNG/WebP export.
Local processingImage Metadata Viewer
View EXIF information stored in a photo, including camera details, date, orientation, and GPS location when available.
Local processingImage Joiner
Combine several images horizontally or vertically into one image. Adjust spacing, background, and alignment.
Local processingImage Watermark Tool
Add a text or image watermark to one or more photographs. Adjust position, size, opacity, rotation, and repeated placement.
Local processingImage Redactor
Blur, pixelate, or black out sensitive information in images. Draw rectangles with undo and redo—all processing stays in your browser.
Local processingImage Color Picker
Pick colors from any uploaded image pixel. Get HEX, RGB, and HSL values with magnifier preview.
Local processingFavicon Generator
Create favicon.ico and common PNG icon sizes from a square PNG or SVG logo and download the complete set as a ZIP archive.
Local processingImages to PDF
Combine JPEG and PNG images into a single PDF. Reorder the images, choose the page size, and download the completed document.
Local processingImage to Base64 Converter
Convert an image into a Base64 data URL or restore a Base64 image value as a downloadable image file.
Local processingMerge PDF Files
Combine several PDF files into one document, change their order, and download the merged result directly in your browser.
Local processingSplit PDF Files
Extract selected pages from a PDF or save every page as a separate PDF file.
Local processingOrganize PDF Pages
Reorder, rotate, and remove PDF pages using thumbnail previews, then download the updated document.
Local processingView and Edit PDF Metadata
View and edit a PDF document's title, author, subject, keywords, creation information, and modification information.
Local processingPDF to Image Converter
Convert PDF pages into PNG or JPEG images, choose the page range and output size, and download the results individually or in a ZIP archive.
Local processingAdd Page Numbers to a PDF
Add consecutive page numbers to a PDF. Choose the starting number, position, font size, and margin and preview the result before downloading.
Local processingFiles and content are processed locally in your browser and are not uploaded to our server.