# LevnTools
> A free toolkit of browser-based utilities for developers, designers, and creators. All processing happens locally — your files never leave your device.

## Key Facts

- All tools are **free** — no account, no signup, no credit card required
- All processing is **client-side** — files are processed in the browser via WebAssembly and the Canvas API and never uploaded to any server
- Works in modern browsers: Chrome 90+, Firefox 88+, Safari 14+, Edge 90+
- No data is collected, no tracking, fully private

## Tools

### Developer Tools

> 24 essential utilities for developers. Format, encode, decode, hash, diff, and convert — all in your browser.

- [JSON Formatter](https://levntools.com/developer-tools/json-formatter): Format, validate, and minify JSON with syntax highlighting and error detection
- [XML Formatter](https://levntools.com/developer-tools/xml-formatter): Format and validate XML documents with syntax highlighting
- [SQL Formatter](https://levntools.com/developer-tools/sql-formatter): Format SQL queries for PostgreSQL, MySQL, SQLite with customizable indentation
- [HTML Formatter](https://levntools.com/developer-tools/html-formatter): Format and beautify HTML markup with proper indentation
- [CSS Formatter](https://levntools.com/developer-tools/css-formatter): Format, minify, and beautify CSS stylesheets
- [JavaScript Formatter](https://levntools.com/developer-tools/js-formatter): Format and minify JavaScript code with configurable options
- [YAML ↔ JSON](https://levntools.com/developer-tools/yaml-json): Convert between YAML and JSON formats instantly
- [CSV ↔ JSON](https://levntools.com/developer-tools/csv-json): Convert between CSV and JSON with column mapping and type inference
- [Base64 Encode/Decode](https://levntools.com/developer-tools/base64): Encode text or files to Base64 and decode Base64 strings back
- [URL Encode/Decode](https://levntools.com/developer-tools/url-encode): Encode and decode URL components and full URLs
- [HTML Entity Encode/Decode](https://levntools.com/developer-tools/html-entities): Convert special characters to HTML entities and back
- [JWT Decoder](https://levntools.com/developer-tools/jwt-decoder): Decode and inspect JWT tokens — header, payload, expiration, signature
- [Number Base Converter](https://levntools.com/developer-tools/number-base): Convert numbers between binary, octal, decimal, and hexadecimal
- [UUID Generator](https://levntools.com/developer-tools/uuid-generator): Generate UUID v1, v4, v7 with bulk generation and format options
- [Password Generator](https://levntools.com/developer-tools/password-generator): Generate strong passwords with customizable length, character types, and entropy display
- [Hash Generator](https://levntools.com/developer-tools/hash-generator): Generate MD5, SHA-1, SHA-256, SHA-512 hashes from text or files
- [Lorem Ipsum Generator](https://levntools.com/developer-tools/lorem-ipsum): Generate placeholder text by paragraphs, sentences, or words
- [Regex Tester](https://levntools.com/developer-tools/regex-tester): Test regular expressions with live highlighting, match groups, and cheat sheet
- [Slug Generator](https://levntools.com/developer-tools/slug-generator): Convert text to URL-safe slugs with customizable separators
- [Timestamp Generator](https://levntools.com/developer-tools/timestamp-generator): Generate Unix timestamps, ISO dates, and custom format strings
- [Diff Checker](https://levntools.com/developer-tools/diff-checker): Side-by-side text comparison with inline highlights and line numbers
- [Cron Parser](https://levntools.com/developer-tools/cron-parser): Parse cron expressions to human-readable descriptions with next N run times
- [Epoch Converter](https://levntools.com/developer-tools/epoch-converter): Convert Unix timestamps to human-readable dates and back with live clock
- [Chmod Calculator](https://levntools.com/developer-tools/chmod-calculator): Linux file permissions calculator with symbolic and numeric notation

### Color Tools

> 11 tools for picking, generating, and testing colors. Build palettes, check contrast, simulate color blindness.

- [Color Picker](https://levntools.com/color-tools/color-picker): Visual spectrum picker with HEX, RGB, HSL output and one-click copy
- [Format Converter](https://levntools.com/color-tools/format-converter): Convert between HEX, RGB, HSL, HSB, CMYK, and CSS color formats
- [Image Color Extractor](https://levntools.com/color-tools/color-extractor): Upload an image and extract the dominant color palette (5-10 colors)
- [Palette Generator](https://levntools.com/color-tools/palette-generator): Generate harmonious palettes — complementary, triadic, analogous, and more
- [Gradient Generator](https://levntools.com/color-tools/gradient-generator): Create CSS linear and radial gradients with color stops and copy CSS code
- [Shades Generator](https://levntools.com/color-tools/shades-generator): Generate tints and shades from any base color in a 10-step scale
- [Random Color](https://levntools.com/color-tools/random-color): Generate random colors with lock/unlock and export as palette
- [Color Mixer](https://levntools.com/color-tools/color-mixer): Blend two colors with adjustable ratio and see interpolation steps
- [Contrast Checker](https://levntools.com/color-tools/contrast-checker): WCAG 2.1 AA/AAA contrast ratio checker for text and background pairs
- [Color Blindness Simulator](https://levntools.com/color-tools/blindness-simulator): Preview colors as seen by users with protanopia, deuteranopia, and tritanopia
- [Tailwind Color Finder](https://levntools.com/color-tools/tailwind-finder): Input any color and find the nearest Tailwind CSS class match

### SEO Tools

> 17 tools for on-page SEO, content analysis, technical SEO, and keyword research. No API keys needed.

- [Meta Tags Analyzer](https://levntools.com/seo-tools/meta-tags): Generate and optimize title, description, viewport, and charset meta tags
- [SERP Preview](https://levntools.com/seo-tools/serp-preview): Live Google search result preview for desktop and mobile
- [Open Graph Builder](https://levntools.com/seo-tools/open-graph): Generate OG meta tags with live social card preview for Facebook and LinkedIn
- [Twitter Card Preview](https://levntools.com/seo-tools/twitter-card): Generate Twitter/X card meta tags with live preview
- [Robots.txt Generator](https://levntools.com/seo-tools/robots-txt): Generate and validate robots.txt rules for search engine crawlers
- [Sitemap Generator](https://levntools.com/seo-tools/sitemap-generator): Generate XML sitemaps from a URL list with priority and frequency settings
- [Favicon Checker](https://levntools.com/seo-tools/favicon-checker): Validate all favicon sizes and formats, generate missing sizes
- [Keyword Density](https://levntools.com/seo-tools/keyword-density): Word frequency analysis with density percentages and keyword highlighting
- [Readability Score](https://levntools.com/seo-tools/readability): Flesch-Kincaid, Gunning Fog, and Coleman-Liau readability scoring
- [Word Counter](https://levntools.com/seo-tools/word-counter): Character, word, sentence, and paragraph count with estimated reading time
- [Heading Analyzer](https://levntools.com/seo-tools/heading-analyzer): H1-H6 heading structure checker with hierarchy validation
- [Link Analyzer](https://levntools.com/seo-tools/link-analyzer): Paste HTML to count internal vs external links and find broken anchors
- [Schema Generator](https://levntools.com/seo-tools/schema-generator): JSON-LD structured data builder for Article, FAQ, Product, and more
- [Canonical URL Checker](https://levntools.com/seo-tools/canonical-url): Validate canonical tags and detect duplicate content issues
- [Redirect Builder](https://levntools.com/seo-tools/redirect-builder): Generate .htaccess and nginx redirect rules for 301 and 302 redirects
- [Keyword Ideas](https://levntools.com/seo-tools/keyword-ideas): Expand seed keywords into clusters using alphabet soup and question formats
- [Keyword Comparison](https://levntools.com/seo-tools/keyword-compare): Side-by-side keyword analysis and scoring for content planning

### QR Code Tools

> 10 QR code generators with full customization — colors, styles, logos, frames — plus a scanner.

- [URL QR Code](https://levntools.com/qr-tools/qr-url): Generate a customizable QR code for any URL
- [Text QR Code](https://levntools.com/qr-tools/qr-text): Generate a QR code for plain text content
- [Email QR Code](https://levntools.com/qr-tools/qr-email): Generate a QR code that opens email compose with pre-filled fields
- [WiFi QR Code](https://levntools.com/qr-tools/qr-wifi): Generate a QR code for WiFi auto-connect with SSID, password, and encryption
- [vCard QR Code](https://levntools.com/qr-tools/qr-vcard): Generate a QR code for a contact card with name, phone, email, and address
- [Phone QR Code](https://levntools.com/qr-tools/qr-phone): Generate a QR code for direct phone call
- [SMS QR Code](https://levntools.com/qr-tools/qr-sms): Generate a QR code that opens SMS compose with pre-filled message
- [Location QR Code](https://levntools.com/qr-tools/qr-location): Generate a QR code for geo coordinates or Google Maps link
- [Calendar Event QR](https://levntools.com/qr-tools/qr-event): Generate a QR code for a calendar event with title, date, and location
- [QR Code Scanner](https://levntools.com/qr-tools/qr-scanner): Decode QR codes from image upload or live camera feed

### Image Tools

> 21 tools to edit, convert, compress, and enhance images. AI-powered pro tools for background removal and upscaling.

- [Image Editor](https://levntools.com/image-tools/image-editor): Full editor — crop, rotate, filters, adjustments, text overlay, and draw
- [Resize Image](https://levntools.com/image-tools/resize): Resize images by pixels or percentage while maintaining aspect ratio
- [Crop Image](https://levntools.com/image-tools/crop): Freeform and preset ratio cropping for images
- [Rotate & Flip](https://levntools.com/image-tools/rotate-flip): Rotate images 90/180/270 degrees and flip horizontal or vertical
- [Add Watermark](https://levntools.com/image-tools/watermark): Add text or image watermarks with position, opacity, and tiling controls
- [Meme Generator](https://levntools.com/image-tools/meme-generator): Add top and bottom text with font, size, and stroke controls on images
- [Collage Maker](https://levntools.com/image-tools/collage-maker): Grid and freeform photo collage with templates and layout options
- [Image Comparison](https://levntools.com/image-tools/image-compare): Before/after slider to compare two images side by side
- [Convert Format](https://levntools.com/image-tools/convert-format): Convert between PNG, JPG, WebP, GIF, BMP, TIFF, and AVIF
- [Compress Image](https://levntools.com/image-tools/compress): Lossy and lossless compression with quality slider and size preview
- [PNG to JPG](https://levntools.com/image-tools/png-to-jpg): Quick convert PNG to JPG with quality control
- [Convert to WebP](https://levntools.com/image-tools/to-webp): Convert any image format to WebP for smaller file sizes
- [SVG to PNG](https://levntools.com/image-tools/svg-to-png): Convert SVG to raster PNG with custom dimensions
- [Image to Base64](https://levntools.com/image-tools/image-to-base64): Encode images to Base64 data URIs for embedding in CSS or HTML
- [GIF Maker](https://levntools.com/image-tools/gif-maker): Create animated GIFs from multiple images with speed and loop controls
- [EXIF/Metadata Viewer](https://levntools.com/image-tools/exif-viewer): View and strip image metadata including EXIF, IPTC, and XMP data
- [Image Color Picker](https://levntools.com/image-tools/image-color-picker): Eyedropper tool to pick exact HEX and RGB colors from uploaded images
- [Favicon Generator](https://levntools.com/image-tools/favicon-generator): Upload an image and generate all favicon sizes plus web manifest
- [Remove Background](https://levntools.com/image-tools/remove-bg): AI-powered background removal — runs 100% in your browser, no upload, no cost
- [AI Upscale](https://levntools.com/image-tools/ai-upscale): 2x and 4x AI image upscaling for higher resolution output
- [AI Enhance](https://levntools.com/image-tools/ai-enhance): Auto color correction, sharpening, and denoising powered by AI

### PDF Tools

> 21 tools to merge, split, compress, convert, protect, and edit PDFs. AI OCR and document conversion for pro users.

- [Merge PDF](https://levntools.com/pdf-tools/merge): Combine multiple PDFs into one with drag-and-drop page reordering
- [Split PDF](https://levntools.com/pdf-tools/split): Split PDF by page range or extract specific pages
- [Compress PDF](https://levntools.com/pdf-tools/compress): Reduce PDF file size with image quality and font subsetting options
- [Rotate PDF](https://levntools.com/pdf-tools/rotate): Rotate all or specific PDF pages by 90, 180, or 270 degrees
- [PDF Page Numbers](https://levntools.com/pdf-tools/page-numbers): Add page numbers with position, format, and font options
- [PDF to JPG](https://levntools.com/pdf-tools/pdf-to-jpg): Convert PDF pages to high-quality JPG images
- [JPG to PDF](https://levntools.com/pdf-tools/jpg-to-pdf): Convert images (JPG, PNG) to a PDF document
- [PDF to PNG](https://levntools.com/pdf-tools/pdf-to-png): Convert PDF pages to PNG images with transparency support
- [PDF to Text](https://levntools.com/pdf-tools/pdf-to-text): Extract raw text content from PDF documents
- [PDF to Word](https://levntools.com/pdf-tools/pdf-to-word): Convert PDF to editable DOCX with formatting preserved
- [Word to PDF](https://levntools.com/pdf-tools/word-to-pdf): Convert DOCX and DOC documents to PDF
- [PDF to Excel](https://levntools.com/pdf-tools/pdf-to-excel): Extract tables from PDF to CSV or XLSX spreadsheets
- [Excel to PDF](https://levntools.com/pdf-tools/excel-to-pdf): Convert XLSX and CSV spreadsheets to PDF documents
- [Protect PDF](https://levntools.com/pdf-tools/protect): Add password protection and permission restrictions to PDFs
- [Unlock PDF](https://levntools.com/pdf-tools/unlock): Remove password protection from PDFs (requires the password)
- [Watermark PDF](https://levntools.com/pdf-tools/pdf-watermark): Add text or image watermarks to PDF pages with position controls
- [Redact PDF](https://levntools.com/pdf-tools/redact): Permanently black out sensitive text and areas in PDF documents
- [PDF Editor](https://levntools.com/pdf-tools/editor): Full editor — annotate, add text, draw shapes, highlight, sign, and export PDFs
- [Sign PDF](https://levntools.com/pdf-tools/sign): Draw, type, or upload a signature and place it on PDF pages
- [OCR PDF](https://levntools.com/pdf-tools/ocr): Extract text from scanned and image-based PDFs using OCR
- [Compare PDFs](https://levntools.com/pdf-tools/compare): Side-by-side visual diff of two PDF documents

### Audio Tools

> 19 tools to convert, trim, merge, equalize, and analyze audio. AI noise removal and vocal separation for pro users.

- [Audio Converter](https://levntools.com/audio-tools/converter): Convert between MP3, WAV, OGG, FLAC, AAC, M4A, and WMA formats
- [Trim & Cut](https://levntools.com/audio-tools/trim): Trim audio with waveform visualization and precise start/end controls
- [Merge Audio](https://levntools.com/audio-tools/merge): Combine multiple audio files sequentially into one track
- [Video to Audio](https://levntools.com/audio-tools/video-to-audio): Extract the audio track from video files (MP4, AVI, MOV, MKV)
- [Speed Changer](https://levntools.com/audio-tools/speed-changer): Change playback speed without affecting pitch
- [Ringtone Maker](https://levntools.com/audio-tools/ringtone-maker): Trim and convert to iPhone (M4R) and Android ringtone formats
- [Compressor](https://levntools.com/audio-tools/compressor): Dynamic range compression with threshold, ratio, attack, and release
- [Equalizer](https://levntools.com/audio-tools/equalizer): Multi-band EQ with presets and custom frequency curves
- [Pitch Shifter](https://levntools.com/audio-tools/pitch-shifter): Shift pitch up or down in semitones without changing speed
- [Reverb & Effects](https://levntools.com/audio-tools/effects): Add reverb, delay, chorus, and distortion effects to audio
- [Fade In/Out](https://levntools.com/audio-tools/fade): Add fade-in and fade-out effects with adjustable curve control
- [Volume Normalizer](https://levntools.com/audio-tools/normalizer): Normalize loudness across one or multiple audio files
- [Silence Remover](https://levntools.com/audio-tools/silence-remover): Auto-detect and remove silent sections from audio files
- [Spectrum Analyzer](https://levntools.com/audio-tools/spectrum): Real-time frequency spectrum and spectrogram visualization
- [BPM Detector](https://levntools.com/audio-tools/bpm-detector): Detect the tempo (BPM) of uploaded audio files
- [Voice Recorder](https://levntools.com/audio-tools/recorder): Browser-based voice recorder with waveform display and MP3/WAV export
- [Audio Metadata Editor](https://levntools.com/audio-tools/metadata-editor): Edit ID3 tags — title, artist, album, artwork, genre, and year
- [Noise Removal](https://levntools.com/audio-tools/noise-removal): AI-powered background noise reduction for clean audio
- [Vocal Remover](https://levntools.com/audio-tools/vocal-remover): AI vocal and instrument separation for karaoke and remixing

### Date & Time Tools

> 10 tools for every shape time takes — world clocks, timers, time zone converters, date calculators, meeting planners, and sunrise tables. All running locally in your browser.

- [World Clock](https://levntools.com/time-tools/world-clock): A living globe showing the current time in cities around the world, with a subsolar day/night terminator and DST awareness
- [Stopwatch](https://levntools.com/time-tools/stopwatch): High-precision stopwatch with lap times, split recording, and keyboard shortcuts. Runs in the background across tabs.
- [Countdown Timer](https://levntools.com/time-tools/countdown-timer): Count down to any moment — launches, weddings, deadlines — with flip-card animation, sound, and shareable links
- [Pomodoro Timer](https://levntools.com/time-tools/pomodoro-timer): Deep-focus timer with configurable work/break intervals, ambient sound, and session history. Pure monastic focus.
- [Time Zone Converter](https://levntools.com/time-tools/timezone-converter): Convert any moment across time zones with a scrubbable 24-hour strip. See work-hour overlap at a glance.
- [Date Calculator](https://levntools.com/time-tools/date-calculator): Calculate the duration between two dates, or add/subtract days, weeks, months, and years with editorial clarity
- [Age Calculator](https://levntools.com/time-tools/age-calculator): Compute your exact age in years, months, weeks, days, hours, and heartbeats — with the next birthday countdown
- [Meeting Planner](https://levntools.com/time-tools/meeting-planner): Find the best meeting time across up to 8 time zones. Color-graded overlap heatmap reveals the diplomatic sweet spot.
- [Week Number](https://levntools.com/time-tools/week-number): Look up the ISO 8601 week number for any date, see the full year as a 52-week grid, and jump to any week
- [Sunrise & Sunset](https://levntools.com/time-tools/sunrise-sunset): Sunrise, sunset, civil/nautical/astronomical twilight, golden hour, and blue hour for any location on any date

## Privacy

LevnTools does not store, transmit, or have access to any files processed by its tools. All computation happens locally in the user's browser. No user accounts are required. No personal data is collected for tool usage.

## Website

- Homepage: https://levntools.com
- Sitemap: https://levntools.com/sitemap.xml