Analyze text
Count characters, words and lines and estimate reading time without sending the text anywhere.
Curated catalog
The right tool, without a detour.
Search by task, file type, or format, or narrow the available tools by category. Tools run on your device; extra component downloads are labeled where they apply.
181 tools found
Data & formats
Transform and validate structured data.
YAML to JSON Converter
YAML to JSON Converter processes structured input locally with bounded parsing, copy and download.
CSV to JSON Converter
CSV to JSON Converter processes structured input locally with bounded parsing, copy and download.
HTML Encoder and Decoder
HTML Encoder and Decoder processes structured input locally with bounded parsing, copy and download.
JSON to TypeScript
JSON to TypeScript processes structured input locally with bounded parsing, copy and download.
SQL, CSV and JSON Converter
SQL, CSV and JSON Converter processes structured input locally with bounded parsing, copy and download.
JSON Schema Validator
JSON Schema Validator processes structured input locally with bounded parsing, copy and download.
CSV/TSV Table Viewer with Filter
CSV/TSV Table Viewer with Filter processes structured input locally with bounded parsing, copy and download.
NDJSON and JSON Converter
NDJSON and JSON Converter processes structured input locally with bounded parsing, copy and download.
Encoding & cryptography
Encode, hash, sign, and inspect secure data.
Convert Base64
Encode Unicode text or local files as Base64 and decode Base64 back to text or a file without uploads.
Morse Code Encoder
Morse Code Encoder runs locally in your browser with bounded input, copy and download.
Morse Code Decoder
Morse Code Decoder runs locally in your browser with bounded input, copy and download.
Character Encoding Converter
Character Encoding Converter runs locally in your browser with bounded input, copy and download.
Unicode Inspector and Normalizer
Unicode Inspector and Normalizer runs locally in your browser with bounded input, copy and download.
String Escape and Unescape
String Escape and Unescape processes structured input locally with bounded parsing, copy and download.
AES-GCM Decrypt
AES-GCM Decrypt runs locally with bounded input and an ephemeral secret lifecycle.
AES-GCM Encrypt
AES-GCM Encrypt runs locally with bounded input and an ephemeral secret lifecycle.
Bcrypt Hash Verifier
Bcrypt Hash Verifier runs locally with bounded input and an ephemeral secret lifecycle.
Caesar Cipher Decoder
Caesar Cipher Decoder runs locally with bounded input and an ephemeral secret lifecycle.
Caesar Cipher Encoder
Caesar Cipher Encoder runs locally with bounded input and an ephemeral secret lifecycle.
HMAC Generate and Verify
HMAC Generate and Verify runs locally with bounded input and an ephemeral secret lifecycle.
JWT Decoder
JWT Decoder runs locally with bounded input and an ephemeral secret lifecycle.
JWT HS256 Encoder
JWT HS256 Encoder runs locally with bounded input and an ephemeral secret lifecycle.
Offline MD5 Hash Lookup
Offline MD5 Hash Lookup runs locally with bounded input and an ephemeral secret lifecycle.
PEM/JWK Key Inspector and Converter
PEM/JWK Key Inspector and Converter runs locally with bounded input and an ephemeral secret lifecycle.
ROT13 Decoder
ROT13 Decoder runs locally with bounded input and an ephemeral secret lifecycle.
ROT13 Encoder
ROT13 Encoder runs locally with bounded input and an ephemeral secret lifecycle.
RSA-OAEP Decrypt
RSA-OAEP Decrypt runs locally with bounded input and an ephemeral secret lifecycle.
RSA-OAEP Encrypt
RSA-OAEP Encrypt runs locally with bounded input and an ephemeral secret lifecycle.
Offline SHA-256 Hash Lookup
Offline SHA-256 Hash Lookup runs locally with bounded input and an ephemeral secret lifecycle.
Coordinate and Geohash Converter
Coordinate and Geohash Converter runs locally with explicit formulas, bounded inputs and English number formatting.
Image to Base64 Encoder
Image to Base64 Encoder runs locally in your browser with bounded inputs and no file upload.
Format & optimize code
Format, minify, and convert source code.
Format and validate JSON
Validate structure, format it clearly, and understand syntax errors at the exact position.
XML Formatter
XML Formatter processes structured input locally with bounded parsing, copy and download.
HTML Formatter
HTML Formatter processes structured input locally with bounded parsing, copy and download.
SQL Formatter
SQL Formatter processes structured input locally with bounded parsing, copy and download.
HTML to Markdown
HTML to Markdown processes structured input locally with bounded parsing, copy and download.
Safe Markdown Preview
Safe Markdown Preview processes structured input locally with bounded parsing, copy and download.
TOML Formatter and Validator
TOML Formatter and Validator processes structured input locally with bounded parsing, copy and download.
chmod Calculator
chmod Calculator runs locally with bounded input and no request to user-entered targets.
Cron Expression Explainer
Cron Expression Explainer runs locally with bounded input and no request to user-entered targets.
JavaScript Minifier
JavaScript Minifier runs locally with bounded input and no request to user-entered targets.
JavaScript Beautifier
JavaScript Beautifier runs locally with bounded input and no request to user-entered targets.
Web, HTTP & SEO
Build and inspect web metadata and requests.
URL Encoder and Decoder
URL Encoder and Decoder runs locally with bounded input and no request to user-entered targets.
HTTP Status Code Reference
HTTP Status Code Reference runs locally with bounded input and no request to user-entered targets.
User-Agent Parser
User-Agent Parser runs locally with bounded input and no request to user-entered targets.
cURL to JavaScript Fetch
cURL to JavaScript Fetch runs locally with bounded input and no request to user-entered targets.
URL Parser and Query Editor
URL Parser and Query Editor runs locally with bounded input and no request to user-entered targets.
Content Security Policy Builder
Content Security Policy Builder runs locally with bounded input and an ephemeral secret lifecycle.
X.509 Certificate Decoder
X.509 Certificate Decoder runs locally with bounded input and an ephemeral secret lifecycle.
Meta tag previewer
Meta tag previewer runs locally with validated inputs, inert output and no target requests.
Generators & test data
Generate identifiers, fixtures, and random inputs.
Generate UUIDs
Generate cryptographically secure UUID v4 or time-ordered RFC 9562 UUID v7 values directly in your browser.
Slug Generator
Slug Generator runs locally in your browser with bounded input, copy and download.
Lorem Ipsum Generator
Lorem Ipsum Generator runs locally in your browser with bounded input, copy and download.
BBCode Generator
BBCode Generator runs locally in your browser with bounded input, copy and download.
Fancy Text Generator
Fancy Text Generator runs locally in your browser with bounded input, copy and download.
Markdown Table Generator
Markdown Table Generator processes structured input locally with bounded parsing, copy and download.
Cron Expression Generator
Cron Expression Generator runs locally with bounded input and no request to user-entered targets.
.gitignore Generator
.gitignore Generator runs locally with bounded input and no request to user-entered targets.
Web App Manifest Generator and Validator
Web App Manifest Generator and Validator runs locally with bounded input and no request to user-entered targets.
Bcrypt Hash Generator
Bcrypt Hash Generator runs locally with bounded input and an ephemeral secret lifecycle.
Hash Generator
Hash Generator runs locally with bounded input and an ephemeral secret lifecycle.
MD5 Checksum Generator
MD5 Checksum Generator runs locally with bounded input and an ephemeral secret lifecycle.
SHA-256 Hash Generator
SHA-256 Hash Generator runs locally with bounded input and an ephemeral secret lifecycle.
Fibonacci Generator
Fibonacci Generator runs locally with explicit formulas, bounded inputs and English number formatting.
Random Number Generator
Random Number Generator runs locally with explicit formulas, bounded inputs and English number formatting.
Color palette generator
Color palette generator runs locally with validated inputs, inert output and no target requests.
Tint and shade generator
Tint and shade generator runs locally with validated inputs, inert output and no target requests.
Robots.txt generator
Robots.txt generator runs locally with validated inputs, inert output and no target requests.
Schema markup generator
Schema markup generator runs locally with validated inputs, inert output and no target requests.
XML sitemap generator
XML sitemap generator runs locally with validated inputs, inert output and no target requests.
CSS gradient generator
CSS gradient generator runs locally with validated inputs, inert output and no target requests.
Test, diff & debug
Compare outputs and diagnose software or devices.
Diff Checker
Diff Checker processes structured input locally with bounded parsing, copy and download.
JSONPath Tester
JSONPath Tester processes structured input locally with bounded parsing, copy and download.
XML Validator and XPath Tester
XML Validator and XPath Tester processes structured input locally with bounded parsing, copy and download.
Regex Tester
Regex Tester runs locally with bounded input and no request to user-entered targets.
SemVer Compare and Range Tester
SemVer Compare and Range Tester runs locally with bounded input and no request to user-entered targets.
CSS, SVG & color
Author and inspect visual web assets.
CSS Minifier
CSS Minifier runs locally with bounded input and no request to user-entered targets.
CSS Specificity Calculator
CSS Specificity Calculator runs locally with bounded input and no request to user-entered targets.
Color contrast checker
Color contrast checker runs locally with validated inputs, inert output and no target requests.
Color picker
Color picker runs locally with validated inputs, inert output and no target requests.
Color vision simulator
Color vision simulator runs locally with validated inputs, inert output and no target requests.
Image Color Picker
Image Color Picker runs locally in your browser with bounded inputs and no file upload.
SVG Optimizer
SVG Optimizer sanitizes and canonicalizes a strict SVG geometry subset locally without uploading the file.
SVG-Pfad-Visualisierer
SVG Path Visualizer parses bounded path data locally and previews only its canonical safe output.
SVG to JPG Converter
SVG to JPG Converter rasterizes a strict sanitized SVG geometry subset locally without uploading the file.
SVG to PNG Converter
SVG to PNG Converter rasterizes a strict sanitized SVG geometry subset locally without uploading the file.
Images
Edit, convert, inspect, and improve images.
Image Cropper
Image Cropper runs locally in your browser with bounded inputs and no file upload.
PNG to JPG Converter
PNG to JPG Converter runs locally in your browser with bounded inputs and no file upload.
PNG to WebP Converter
PNG to WebP Converter runs locally in your browser with bounded inputs and no file upload.
WebP Converter
WebP Converter runs locally in your browser with bounded inputs and no file upload.
JPG to WebP Converter
JPG to WebP Converter runs locally in your browser with bounded inputs and no file upload.
JPG to PNG Converter
JPG to PNG Converter runs locally in your browser with bounded inputs and no file upload.
Image Compressor
Image Compressor runs locally in your browser with bounded inputs and no file upload.
Image Blur & Censor
Image Blur & Censor runs locally in your browser with bounded inputs and no file upload.
Image Rotate & Flip
Image Rotate & Flip runs locally in your browser with bounded inputs and no file upload.
Image Watermark
Image Watermark runs locally in your browser with bounded inputs and no file upload.
Image Filters
Image Filters runs locally in your browser with bounded inputs and no file upload.
Image Resizer
Image Resizer runs locally in your browser with bounded inputs and no file upload.
BMP to PNG Converter
BMP to PNG Converter runs locally in your browser with bounded inputs and no file upload.
BMP to JPG Converter
BMP to JPG Converter runs locally in your browser with bounded inputs and no file upload.
Aspect Ratio Calculator
Aspect Ratio Calculator runs locally in your browser with bounded inputs and no file upload.
PNG to ICO Converter
PNG to ICO Converter creates one bounded PNG-in-ICO entry locally from a square PNG without uploading it.
ICO to PNG Converter
ICO to PNG Converter extracts the closest bounded icon entry locally without uploading the file.
Animated GIF Creator
Animated GIF Creator combines ordered local PNG, JPEG or WebP frames into one complete animation without uploading them.
GIF to PNG Converter
GIF to PNG Converter exports the first fully composited GIF frame locally without uploading the animation.
GIF to JPG Converter
GIF to JPG Converter exports the first fully composited GIF frame locally without uploading the animation.
TIFF to JPG Converter
TIFF to JPG Converter exports one selected classic TIFF page locally without uploading the source.
TIFF to PNG Converter
TIFF to PNG Converter exports one selected classic TIFF page locally with decoded transparency.
PNG to AVIF Converter
PNG to AVIF Converter encodes one PNG locally as AVIF while retaining decoded transparency.
Local after download
JPG to AVIF Converter
JPG to AVIF Converter encodes one JPEG locally as AVIF without uploading the source.
Local after download
AVIF to PNG Converter
AVIF to PNG Converter decodes one static AVIF locally and exports a PNG with decoded transparency.
Local after download
AVIF to JPG Converter
AVIF to JPG Converter decodes one static AVIF locally and exports an opaque JPEG without uploading the source.
Local after download
Text & writing
Clean, analyze, transform, and understand text.
Text Cleaner
Text Cleaner runs locally in your browser with bounded input, copy and download.
Case Converter
Case Converter runs locally in your browser with bounded input, copy and download.
Sort Lines
Sort Lines runs locally in your browser with bounded input, copy and download.
Remove Duplicate Lines
Remove Duplicate Lines runs locally in your browser with bounded input, copy and download.
Remove Empty Lines
Remove Empty Lines runs locally in your browser with bounded input, copy and download.
Text Reverser
Text Reverser runs locally in your browser with bounded input, copy and download.
Add Line Numbers
Add Line Numbers runs locally in your browser with bounded input, copy and download.
Find and Replace
Find and Replace runs locally in your browser with bounded input, copy and download.
Readability Score
Readability Score runs locally in your browser with bounded input, copy and download.
Sentiment Analyzer
Sentiment Analyzer runs locally in your browser with bounded input, copy and download.
Language Detector
Language Detector runs locally in your browser with bounded input, copy and download.
Compare Lists and Build Sets
Compare Lists and Build Sets runs locally in your browser with bounded input, copy and download.
Punycode / IDN Converter
Punycode / IDN Converter runs locally in your browser with bounded input, copy and download.
Calculate & convert
Calculate everyday values and convert units.
Area and Perimeter Calculator
Area and Perimeter Calculator runs locally with explicit formulas, bounded inputs and English number formatting.
Circle Calculator
Circle Calculator runs locally with explicit formulas, bounded inputs and English number formatting.
Exponent and Power Calculator
Exponent and Power Calculator runs locally with explicit formulas, bounded inputs and English number formatting.
Factorial Calculator
Factorial Calculator runs locally with explicit formulas, bounded inputs and English number formatting.
Fraction Calculator
Fraction Calculator runs locally with explicit formulas, bounded inputs and English number formatting.
GCD and LCM Calculator
GCD and LCM Calculator runs locally with explicit formulas, bounded inputs and English number formatting.
Grade Calculator
Grade Calculator runs locally with explicit formulas, bounded inputs and English number formatting.
Logarithm Calculator
Logarithm Calculator runs locally with explicit formulas, bounded inputs and English number formatting.
Matrix Calculator
Matrix Calculator runs locally with explicit formulas, bounded inputs and English number formatting.
Number Base Converter
Number Base Converter runs locally with explicit formulas, bounded inputs and English number formatting.
Number to Words
Number to Words runs locally with explicit formulas, bounded inputs and English number formatting.
Permutation and Combination Calculator
Permutation and Combination Calculator runs locally with explicit formulas, bounded inputs and English number formatting.
Prime Number Tools
Prime Number Tools runs locally with explicit formulas, bounded inputs and English number formatting.
Probability Calculator
Probability Calculator runs locally with explicit formulas, bounded inputs and English number formatting.
Quadratic Equation Solver
Quadratic Equation Solver runs locally with explicit formulas, bounded inputs and English number formatting.
Ratio Calculator
Ratio Calculator runs locally with explicit formulas, bounded inputs and English number formatting.
Roman Numeral Converter
Roman Numeral Converter runs locally with explicit formulas, bounded inputs and English number formatting.
Scientific Calculator
Scientific Calculator runs locally with explicit formulas, bounded inputs and English number formatting.
Square Root Calculator
Square Root Calculator runs locally with explicit formulas, bounded inputs and English number formatting.
Triangle Calculator
Triangle Calculator runs locally with explicit formulas, bounded inputs and English number formatting.
Unit Converter
Unit Converter runs locally with explicit formulas, bounded inputs and English number formatting.
Volume and Surface Area Calculator
Volume and Surface Area Calculator runs locally with explicit formulas, bounded inputs and English number formatting.
Bill Splitter
Bill Splitter runs locally with explicit calendar, formula, rounding and assumption boundaries.
BMI Calculator
BMI Calculator runs locally with explicit calendar, formula, rounding and assumption boundaries.
Break-even Calculator
Break-even Calculator runs locally with explicit calendar, formula, rounding and assumption boundaries.
Compound Interest Calculator
Compound Interest Calculator runs locally with explicit calendar, formula, rounding and assumption boundaries.
Loan Calculator
Loan Calculator runs locally with explicit calendar, formula, rounding and assumption boundaries.
Profit Margin Calculator
Profit Margin Calculator runs locally with explicit calendar, formula, rounding and assumption boundaries.
Recipe Scaler
Recipe Scaler runs locally with explicit calendar, formula, rounding and assumption boundaries.
ROI Calculator
ROI Calculator runs locally with explicit calendar, formula, rounding and assumption boundaries.
Salary to Hourly Calculator
Salary to Hourly Calculator runs locally with explicit calendar, formula, rounding and assumption boundaries.
Sales Tax Calculator
Sales Tax Calculator runs locally with explicit calendar, formula, rounding and assumption boundaries.
Tip Calculator
Tip Calculator runs locally with explicit calendar, formula, rounding and assumption boundaries.
Date & time
Plan, compare, and convert dates and times.
Percentage Calculator
Percentage Calculator runs locally with explicit formulas, bounded inputs and English number formatting.
Statistics Calculator
Statistics Calculator runs locally with explicit formulas, bounded inputs and English number formatting.
Age Calculator
Age Calculator runs locally with explicit calendar, formula, rounding and assumption boundaries.
Business Days Calculator
Business Days Calculator runs locally with explicit calendar, formula, rounding and assumption boundaries.
Countdown Timer
Countdown Timer runs locally with explicit calendar, formula, rounding and assumption boundaries.
Date Difference Calculator
Date Difference Calculator runs locally with explicit calendar, formula, rounding and assumption boundaries.
ICS Event Builder and Parser
ICS Event Builder and Parser runs locally with explicit calendar, formula, rounding and assumption boundaries.
Mortgage Calculator
Mortgage Calculator runs locally with explicit calendar, formula, rounding and assumption boundaries.
Pomodoro Timer
Pomodoro Timer runs locally with explicit calendar, formula, rounding and assumption boundaries.
Stopwatch
Stopwatch runs locally with explicit calendar, formula, rounding and assumption boundaries.
Time Duration Calculator
Time Duration Calculator runs locally with explicit calendar, formula, rounding and assumption boundaries.
Timestamp Converter
Timestamp Converter runs locally with explicit calendar, formula, rounding and assumption boundaries.
Timezone Converter
Timezone Converter runs locally with explicit calendar, formula, rounding and assumption boundaries.
ISO Week Number Calculator
ISO Week Number Calculator runs locally with explicit calendar, formula, rounding and assumption boundaries.
World Clock
World Clock runs locally with explicit calendar, formula, rounding and assumption boundaries.
Privacy & security
Protect accounts, files, and personal information.
Offline Password Breach Checker
Offline Password Breach Checker runs locally with bounded input and an ephemeral secret lifecycle.
Password Generator
Password Generator runs locally with bounded input and an ephemeral secret lifecycle.
Password Strength Meter
Password Strength Meter runs locally with bounded input and an ephemeral secret lifecycle.
TOTP Code Generator
TOTP Code Generator runs locally with bounded input and an ephemeral secret lifecycle.
Web & sharing
Create codes, links, and assets for sharing.
UTM builder
UTM builder runs locally with validated inputs, inert output and no target requests.
Social Media Image Resizer
Social Media Image Resizer runs locally in your browser with bounded inputs and no file upload.
Favicon Generator
Favicon Generator creates a deterministic six-size favicon.ico locally from one square PNG without uploading it.