CodeVella
Local-first utilities

All online tools

Search fast, privacy-friendly tools that run locally in your browser. No upload, no signup, and no server-side processing.

148

Tools

9

Categories

136

New

148 tools available

JSON Formatter Format, validate, minify, and clean JSON for APIs Popular
JSON Validator Validate JSON syntax and spot parsing issues
JSON Minifier Minify JSON and remove whitespace New
JSON to Base64 Converter Convert JSON payloads to Base64 New
CSV to JSON Convert CSV rows into JSON objects New
JSON to CSV Convert JSON objects into CSV New
CSS Formatter Format messy CSS into readable, indented stylesheets New
CSS Minifier Minify CSS by removing comments and unnecessary whitespace New
JavaScript Formatter Format JavaScript snippets with readable indentation New
JavaScript Minifier Minify JavaScript snippets without unsafe code transforms New
HTML Formatter Format nested HTML markup into readable lines New
HTML Minifier Minify HTML snippets by removing comments and extra whitespace New
XML Formatter Validate and format XML into readable indentation New
XML Validator Validate XML syntax and detect parser errors New
YAML Formatter Parse and format YAML into clean readable output New
YAML Validator Validate YAML syntax and surface parser errors New
JSON to YAML Converter Convert valid JSON into readable YAML New
YAML to JSON Converter Convert YAML into formatted JSON New
Base64 Encode Decode Encode UTF-8 text to Base64 and decode Base64 back to text Popular
URL Encode Decode Encode or decode URL-safe text instantly
HTML Entity Encoder Encode and decode HTML entities New
QR Code Generator Generate QR codes from URLs or text and download PNG or SVG New
UUID Generator Generate random UUID v4 values for apps, databases, and tests Popular
Timestamp Converter Convert Unix timestamps and readable dates New
Regex Tester Test JavaScript regular expressions New
Hash Generator Generate MD5, SHA-1, SHA-256 hashes Popular
SHA1 Hash Generator Generate SHA1 hashes from text New
SHA256 Hash Generator Generate SHA256 hashes from text New
MD5 Hash Generator Generate MD5 checksums from text New
JWT Decoder Decode JWT headers and payloads safely
JSON Escape Unescape Escape and unescape JSON string content New
JSON Diff Checker Compare two JSON objects with sorted keys New
Text Diff Checker Compare two text blocks line by line New
Line Break Remover Remove line breaks and join text lines New
Add Line Numbers Prefix text lines with line numbers New
HTML Stripper Remove HTML tags and extract plain text New
UUID Validator Validate UUID strings and detect versions New
Password Strength Checker Check password strength locally New
Query String Parser Parse URL query parameters into JSON New
Base64 File Encoder Convert local files to Base64 strings New
Word Counter Count words, characters, sentences, and lines
Character Counter Count characters, spaces, bytes, and lines New
Case Converter Convert text between common case formats
Remove Duplicate Lines Clean repeated lines from text lists New
Sort Lines Sort text lines alphabetically or numerically New
Text to Slug Create clean URL slugs from text New
Lorem Ipsum Generator Generate placeholder copy for layouts New
Remove Extra Spaces Trim whitespace and clean blank lines New
Text Reverser Reverse characters, words, or lines New
Markdown Previewer Preview Markdown as safe HTML New
Markdown to HTML Convert Markdown into HTML New
HTML to Markdown Convert common HTML into Markdown New
Number to Word Converter Convert numbers into English words New
URL Parser Break a URL into protocol, host, path, query parameters, and hash New
UTM Builder Build campaign URLs with source, medium, campaign, term, and content parameters New
Cron Expression Generator Generate common cron schedules and explain the expression fields New
HTTP Status Code Lookup Search common HTTP status codes by code, phrase, category, or meaning New
HTTP Headers Parser Parse raw request or response headers into structured rows New
MIME Type Checker Look up common file extensions, MIME types, and content categories New
Open Graph Preview Preview title, description, image, and URL for social sharing cards New
Canonical URL Checker Check HTML for canonical tag presence, duplicates, and URL match New
Sitemap Generator Generate a simple XML sitemap from pasted URLs New
Hreflang Tag Generator Generate alternate language tags from language and URL pairs New
Color Converter Convert HEX colors into RGB and HSL values New
Color Contrast Checker Check foreground and background colors against WCAG contrast thresholds New
CSS Gradient Generator Generate linear or radial CSS gradients with live preview New
CSS Box Shadow Generator Create CSS box-shadow values with live controls and preview New
CSS Border Radius Generator Build border-radius CSS for one, two, or four rounded corners New
Meta Tag Generator Generate SEO, Open Graph, and Twitter card meta tags New
SERP Simulator Preview search result titles, descriptions, and URLs New
Robots.txt Generator Create robots.txt files with crawler rules, disallow paths, and sitemap lines Popular
Schema Markup Generator Generate starter JSON-LD schema markup for SEO New
Keyword Density Checker Analyze repeated keywords and term density in text New
Flesch Readability Calculator Estimate reading ease and grade level for pasted text New
HTML Lang Attribute Checker Check pasted HTML for a valid html lang attribute New
Image Alt Tag Checker Find missing, empty, and duplicate image alt attributes New
Internal Link Checker Audit pasted HTML for internal, external, and empty links New
.htaccess Generator Generate Apache rewrite, HTTPS, caching, and hotlink rules New
Age Calculator Calculate exact age in years, months, days, and total days New
Miles to KM Converter Convert miles to kilometers with the exact conversion factor New
CM to Feet Converter Convert centimeters to feet and inches New
Grams to Pounds Converter Convert grams to pounds and ounces New
Playback Speed Calculator Calculate watch time and time saved at faster speeds New
Salary Calculator Convert hourly, monthly, and annual salary amounts New
Time Average Calculator Average multiple time values in HH:MM:SS or MM:SS format New
Hex Calculator Calculate hexadecimal arithmetic and bitwise operations New
Binary Calculator Calculate binary arithmetic and bitwise operations New
Bit Shift Calculator Shift integer bits left or right and view binary output New
Date Calculator Add or subtract days, weeks, months, and years from any date New
Days Between Dates Count days, weeks, and approximate months between two dates New
Time Zone Converter Convert a date and time between common time zones New
Countdown Timer Create a live countdown to a target date and time New
Unit Converter Convert length, weight, and volume units for everyday use New
Temperature Converter Convert Celsius, Fahrenheit, and Kelvin temperatures New
Cooking Measurement Converter Convert kitchen measurements like cups, tablespoons, teaspoons, and milliliters New
Tip Calculator Calculate tip amount, total bill, and per-person split New
Split Bill Calculator Split a bill with tax and tip across multiple people New
Random Picker Pick one or more random items from a custom list New
Compress PNG Online Compress and resize PNG images locally in your browser New
Compress JPG Online Compress JPG and JPEG photos with quality and scale controls New
Image Resizer Resize images and export common formats New
PNG to WebP Convert PNG images to WebP New
JPG to PNG Convert JPG images to PNG New
Image Cropper Crop PNG, JPG, and WebP images locally in your browser New
EXIF Viewer Read common JPEG EXIF metadata locally New
EXIF Remover Strip image metadata by re-encoding through browser canvas New
SVG Optimizer Clean SVG markup locally and reduce unnecessary bytes New
SVG to PNG Converter Render SVG markup to downloadable PNG output New
WebP to PNG Convert WebP images to PNG locally New
eCommerce Profit Calculator Calculate profit, margin, and break-even price New
Discount Calculator Calculate sale price, savings, and total New
SKU Generator Generate clean product SKU batches New
Variant Matrix Generator Generate product variants as CSV New
Sales Tax Calculator Calculate tax from a manual rate New
Random Email Generator Generate safe example email addresses New
Random Phone Number Generator Generate synthetic US phone numbers New
Random Username Generator Generate usernames for mock accounts New
Random Date Generator Generate random dates in useful ranges New
Random Number Generator Generate random integers in a range New
Random Company Name Generator Generate fictional company names New
Random Job Title Generator Generate job titles for personas New
Random User Profile Generator Generate complete synthetic user profiles New
Random CSV Test Data Generator Generate CSV rows for tests and demos New
Random JSON Mock Data Generator Generate JSON mock records New
Random IP Address Generator Generate documentation-safe IPv4 addresses New
Random User Agent Generator Generate browser user agent strings New
PS5 Gamertag Generator Generate PSN-friendly name ideas with style filters New
Xbox Gamertag Generator Generate Xbox-style gamertag ideas with style filters and keywords New
Minecraft Username Generator Generate short Minecraft username ideas with block and craft styles New
Twitch Username Generator Generate streamer-friendly usernames for Twitch channels New
YouTube Channel Name Generator Generate channel name ideas for creators, tutorials, reviews, and media brands New
Business Name Generator Generate business name ideas by industry, tone, and keyword New
Brand Name Generator Generate short brandable name ideas for products, apps, and startups New
Domain Name Generator Generate domain name ideas from keywords, styles, and extensions New
Team Name Generator Generate team names for work groups, projects, esports, and communities New
Random US Address Generate synthetic US addresses with names, ZIP codes, and matching phone area codes Popular
Random UK Address Generate synthetic UK addresses with names, country/region, postcode, and local-format phone numbers New
Random Canada Address Generate synthetic Canada addresses with names, province/territory, postal code, and local-format phone numbers New
Random Australia Address Generate synthetic Australia addresses with names, state/territory, postcode, and local-format phone numbers New
Random Germany Address Generate synthetic Germany addresses with names, state, postal code, and local-format phone numbers New
Random France Address Generate synthetic France addresses with names, region, postal code, and local-format phone numbers New
Random Japan Address Generate synthetic Japan addresses with names, prefecture, postal code, and local-format phone numbers New
Random India Address Generate synthetic India addresses with names, state/territory, PIN code, and local-format phone numbers New
Random Brazil Address Generate synthetic Brazil addresses with names, state, CEP, and local-format phone numbers New
Random Italy Address Generate synthetic Italy addresses with names, region, CAP, and local-format phone numbers New
Random Spain Address Generate synthetic Spain addresses with names, autonomous community, postal code, and local-format phone numbers New
Random Name Generator Generate synthetic names for QA and demos
Password Generator Generate strong random passwords New

Private by default

Tools are designed to process data locally in the browser whenever possible.

Static and fast

Pages are generated as static HTML first, with lightweight client-side filtering.

Built to expand

Each tool is driven by shared configuration so new tools can be added consistently.