cURL to fetch
Convert a bounded cURL command into a redacted, reviewable fetch request without sending it.
Your everyday toolbox.
Tools for files, code, design, and everyday calculations. All on your device.
Ctrl K
Start with a fileDrop an image or PDF to find the right tool.
Explore tools
161 toolsAPIs & HTTP
cURL to Python requests
Turn a bounded cURL command into a reviewable Python requests snippet, entirely locally.
fetch to cURL
Convert a static fetch call into a redacted cURL command without evaluating JavaScript.
HAR viewer
Summarize a pasted HAR locally while keeping bodies, cookies and sensitive request values out of the report.
HTTP header parser
Parse pasted HTTP headers, preserve repeated fields, and suppress sensitive values by default.
HTTP response inspector
Inspect pasted status lines, headers and bodies with sensitive response values redacted by default.
OpenAPI validator
Run bounded local structural checks on an OpenAPI 3 JSON document without resolving references.
Webhook signature verifier
Verify a pasted HMAC webhook signature with local Web Crypto and omit the secret from every result.
Small business
Break-even calculator
Explore contribution, whole-unit break-even and profit across sales scenarios.
Hourly rate calculator
Translate annual income, overhead and billable capacity into a planning rate.
Invoice number generator
Preview and export a deterministic invoice identifier sequence with date and padding controls.
Loan payment calculator
Explore a fixed-rate monthly payment and inspect a cent-rounded amortization schedule.
Profit margin calculator
Compare margin and markup or find a selling price for a target margin.
Quote builder
Create a local itemized quote with discounts, selected taxable lines and printable HTML export.
Sales tax calculator
Add a supplied tax rate or extract tax from an inclusive amount, with an exact breakdown.
Tip calculator
Choose a tip basis, round the total and split the bill down to the last cent.
Code tools
CSS Formatter
Lay out bounded CSS rules and declarations locally without applying the stylesheet.
HTML Formatter
Indent bounded static HTML locally without rendering it or executing scripts.
JavaScript Formatter
Lay out basic JavaScript structure while keeping pasted code as inert text in your browser.
package.json Validator
Check practical package manifest fields locally without resolving, installing, or auditing dependencies.
Regex Explainer
Read common regular-expression tokens as plain language and export a compact explanation without running a pattern.
Regex Replace Tester
Preview a bounded regular-expression replacement locally and export its exact text output.
Regex Tester
Test a bounded regular expression against local text, inspect match offsets and captures, then export the report.
SemVer Range Tester
Test a complete SemVer version against a documented local range subset and export the decision.
Configuration
INI to JSON
Convert simple INI sections and string values into explicit JSON locally.
JSON to XML
Create clean XML from a documented JSON mapping for elements, attributes and text.
JSON to YAML
Turn JSON into clean, portable YAML using a documented safe data subset.
TOML to JSON
Convert standard TOML tables and scalar data to formatted JSON locally.
XML formatter
Validate and pretty-print inert XML without loading external entities or resources.
XML to JSON
Map XML elements, attributes and repeated children into explicit JSON locally.
YAML to JSON
Convert a bounded YAML data subset into formatted JSON entirely in your browser.
YAML validator
Check YAML structure, nesting and safe-subset compatibility locally.
CSV & tables
CSV column picker
Select CSV columns and rearrange their export order with a live table preview.
Remove duplicate CSV rows
Remove duplicate CSV rows using selected key columns while keeping the first or last match.
Filter CSV rows
Keep CSV rows matching a text or numeric condition and preview the matching rows immediately.
Sort CSV
Sort CSV rows by text or numbers, with clickable column headings and a live table preview.
CSV to JSON
Convert CSV rows into JSON objects or arrays with explicit headers and optional value conversion.
Transpose CSV
Swap CSV rows and columns, with optional header inclusion and a live shape preview.
Spreadsheet editor
Edit CSV and Excel workbooks locally in a full browser spreadsheet with formulas, sheets and formatting.
JSON to CSV
Convert JSON objects, rows or primitive arrays into CSV with a live table preview.
Dates & time
Age calculator
Calculate age at a chosen date, birthday progress and days until the next anniversary.
Business days calculator
Count working days with selectable weekdays, endpoint rules and your own holiday dates.
Date add / subtract
Move a date by years, months, weeks and days with clear month-end adjustments.
Date difference
Count calendar days between two dates and explore the range on a calendar.
Duration calculator
Add or subtract precise durations and see the result in hours, days and milliseconds.
ISO week calculator
Convert a calendar date to an ISO week date, or find the date for a numbered week.
Timezone converter
Compare one UTC instant across IANA timezones with side-by-side clocks and date changes.
Unix timestamp converter
Convert exact Unix seconds or milliseconds to UTC and back with a live instant preview.
Design & CSS
Border radius generator
Shape all four corners with live CSS previews and pixel or percentage radii.
Box shadow generator
Adjust shadows visually with offsets, blur, spread, color and inset controls.
Color converter
Convert HEX, RGB and HSL colors with a live swatch and explicit transparency.
Contrast checker
Check text contrast with live reading samples and WCAG AA and AAA thresholds.
CSS clamp calculator
Create fluid font sizes and scrub the viewport to preview the interpolation.
CSS filter generator
Tune image-style filters with a live before-and-after illustration and CSS output.
Cubic Bézier editor
Shape an easing curve with draggable handles, exact points and a motion preview.
Gradient generator
Design linear and radial gradients with color stops and an immediate preview.
Palette generator
Build harmonious five-color palettes from a base color and copy them as CSS variables.
Typography scale
Preview a modular type scale with your own text, ratio and font style.
DevOps
Chmod calculator
Toggle Unix permission bits and inspect exact octal, symbolic and special-bit representations.
Cron expression builder
Build a five-field UTC cron expression with presets and an interactive map of matching values.
Cron next-run preview
See the next UTC dates for a numeric five-field cron schedule with a bounded, explicit search window.
CSP policy builder
Draft a Content Security Policy header with editable source lists and an explicit fallback preview.
Docker Compose validator
Inspect a supported Compose subset for service types, dependencies and structural issues entirely locally.
Docker run to Compose
Convert supported static docker run arguments into Compose YAML without executing any commands.
Gitignore builder
Combine project presets and custom rules with a local path-matching preview and downloadable ignore content.
Nginx config formatter
Format supported Nginx configuration tokens while preserving quoted content and checking balanced structure.
Developer utilities
Base64 encoder / decoder
Encode Unicode text as Base64 or decode it, with URL-safe options and an interactive byte preview.
Hash file
Calculate a local SHA-256, SHA-384, or SHA-512 fingerprint of any file and compare an expected checksum.
Hash text
Create SHA-256, SHA-384, or SHA-512 checksums from exact UTF-8 text and compare with an expected digest.
HTML entity encoder / decoder
Escape HTML special characters or decode named and numeric references as safe plain text, with a live preview.
JWT decoder
Inspect JWT header and payload JSON, timestamps, and signature size with a clear unverified-token status.
Number base converter
Convert exact whole numbers between bases 2–36 with live binary, octal, decimal, and hexadecimal comparisons.
Password generator
Create random passwords with deliberate length and character controls, multiple outputs, and local copy or download.
Text to binary
Convert UTF-8 text to binary byte groups and back, with live output and a byte-by-byte hexadecimal inspector.
URL encoder / decoder
Encode or decode URL components, whole URLs, and form values with direction controls and live output.
UUID generator
Generate random version 4 UUIDs on your device, with batch count, hyphen, uppercase, copy, and download controls.
Files & archives
Batch file renamer
Rename multiple files with a live filename preview, prefixes, numbering and a ZIP download of the original contents.
Binary hex viewer
Browse any file as hexadecimal bytes and ASCII with precise offsets, paged navigation and page export.
File compare
Compare two files byte for byte with an interactive difference map, exact counts and a downloadable report.
GZIP compressor
Compress a file locally with fast, balanced or smallest GZIP settings and compare the resulting file size.
GZIP decompressor
Restore a single-member GZIP file locally with header, size and CRC-32 integrity checks.
ZIP creator
Package files into one ZIP with portable filenames. Reorder the list and download original bytes in a stored archive.
ZIP extractor
Browse ZIP entries, choose files and extract verified contents locally with bounded expansion and CRC checks.
ZIP inspector
Explore ZIP filenames, declared sizes and compression methods in an interactive directory without extracting contents.
Geography
Bearing Calculator
Find the initial great-circle bearing and cardinal direction between two WGS84 coordinates.
Coordinate Converter
Convert WGS84 decimal latitude and longitude into degrees, minutes and seconds.
Destination Point Calculator
Project a local spherical WGS84 destination from a coordinate, bearing and distance.
Distance Calculator
Calculate a local WGS84 spherical great-circle distance between two coordinates.
Geojson Bounds
Calculate the local numeric WGS84 envelope and center of bounded GeoJSON coordinates.
Geojson Validator
Validate bounded GeoJSON geometry structure and WGS84 coordinate positions locally.
Gpx Waypoint Extractor
Extract waypoint and optional route or track coordinates from bounded GPX text as CSV.
Midpoint Calculator
Find the midpoint of a spherical WGS84 great-circle path between two coordinates.
Images
Compress image
Re-encode PNG, JPEG, or static WebP with format and quality controls. Compare actual input and output sizes.
Crop image
Crop PNG, JPEG, or WebP visually with draggable handles, aspect ratios, and precise pixel controls.
Flip image
Mirror PNG, JPEG, or static WebP horizontally, vertically, or across both axes on your device.
JPG to PNG
Convert a JPEG image to PNG without another lossy encoding step. Apply its EXIF orientation automatically.
JPG to WebP
Convert a JPEG image to WebP with adjustable quality while retaining its oriented dimensions.
PNG to JPG
Convert a static PNG image to JPEG with adjustable quality and an explicit background for transparency.
PNG to WebP
Convert a static PNG image to WebP. Keep its dimensions and transparency with high-quality compression.
Remove image metadata
Re-encode PNG, JPEG, or static WebP to remove source EXIF, GPS, XMP, comments, and color profiles.
Resize image
Resize PNG, JPEG, or static WebP to fit a box or use exact pixel dimensions, with optional enlargement.
Rotate image
Rotate PNG, JPEG, or static WebP by 90, 180, or 270 degrees with automatic EXIF orientation.
WebP to JPG
Convert a static WebP image to JPEG with adjustable quality and a background color for transparent areas.
WebP to PNG
Convert a static WebP image to PNG. Keep the original dimensions and transparent background.
JSON
Compare JSON
Find structural JSON differences with path filters and a readable before-and-after change report.
Flatten JSON
Turn nested JSON into reversible path records that preserve empty containers and unusual keys.
JSON Lines converter
Convert JSON arrays to JSONL or NDJSON and back with an individual record preview and clear line errors.
Merge JSON
Combine JSON documents with live conflict previews, deep or shallow merging, and explicit array rules.
Sort JSON keys
Sort nested JSON object keys alphabetically with a live preview while keeping array order intact.
JSON tree viewer
Explore JSON branches, navigate escaped paths, and export precisely the value you select.
Unflatten JSON
Restore nested JSON from explicit path records and explore the reconstructed structure.
JSON validator
Check JSON syntax, inspect value types and nesting depth, and save a clear local validation report.
Calculators
Average calculator
Explore mean, median, modes, range, and standard deviation with a live distribution of your number list.
Fraction calculator
Add, subtract, multiply, and divide fractions with exact reduced answers and an equal-parts preview.
Number to words
Write exact numbers in English words, with place-value groups and digit-by-digit decimals.
Percentage calculator
Find a percentage, compare a part to a whole, or explore percentage changes with a live equation.
Prime number checker
Check whether an integer is prime and see a divisor or the exact trial-division evidence.
Random number generator
Draw random integers from an inclusive range, choose unique results, and reveal a copyable list.
Ratio calculator
Simplify two ratio parts and scale either side to a target while preserving an exact relationship.
Roman numeral converter
Convert numbers and Roman numerals in either direction, with a breakdown of additive and subtractive symbols.
Scientific calculator
Calculate typed expressions or use the keypad, switch angle modes, and recall your recent calculations.
Unit converter
Convert length, mass, temperature, area, volume, speed, time, and storage with clear units and a quick swap.
Networking
CIDR aggregator
Combine overlapping and adjacent IPv4 CIDRs without adding addresses to the result.
CIDR contains IP
Check IPv4 and IPv6 addresses against a CIDR range with a visual prefix comparison.
CIDR splitter
Split an IPv4 network into equal subnets and inspect each address range.
IPv4 number converter
Convert IPv4 addresses to unsigned integers, hexadecimal and binary with editable bits.
IPv4 range to CIDR
Turn an inclusive IPv4 address range into the smallest exact set of CIDR blocks.
IPv4 subnet calculator
Explore an IPv4 network, its subnet mask, address range and host counts.
IPv6 address converter
Compress and expand IPv6 addresses, and inspect all eight hexadecimal groups.
MAC address formatter
Format a 48-bit MAC address and inspect its bytes and address flags.
Add PDF page numbers
Number all or selected PDF pages with a starting number, optional prefix, font size, and six placement choices.
Delete PDF pages
Remove unwanted pages from a PDF while keeping the remaining pages in their original order.
Extract PDF pages
Save selected PDF pages as a new document. Enter page numbers and ranges in the exact order you want.
Images to PDF
Combine ordered PNG and JPEG images into a PDF. Choose A4, Letter, or image-sized pages with adjustable margins.
Merge PDFs
Combine your PDF documents into one file. Arrange them in the right order, then download your merged PDF.
Reorder PDF pages
Rearrange every page of a PDF using an explicit page order, with validation for missing pages and duplicates.
Rotate PDF pages
Rotate all or selected PDF pages clockwise by 90, 180, or 270 degrees without rasterizing their contents.
Split PDF
Split a PDF into separate page files. Select all pages or specific ranges, then download individual PDFs or one ZIP.
Watermark PDF
Place a centered text watermark on all or selected PDF pages with adjustable color, angle, size, and opacity.
Text
Add line numbers
Prefix text lines with numbers using a starting index and a choice of formats, with an option to leave blank lines alone.
Case converter
Convert text to uppercase, lowercase, title case, or simple sentence case, then copy or download the result.
Compare lists
Find items in both lists or only one list, with case and whitespace options and three downloadable results.
Find and replace
Replace literal text once or everywhere, with optional case-insensitive matching and a downloadable result.
Format JSON
Make JSON easier to read with consistent indentation. Format and download it locally in your browser.
Join lines
Turn a multiline list into one text value using your own literal delimiter, with optional trimming and blank-line removal.
Remove duplicate lines
Clean up a list by removing repeated lines. Keep the first occurrence, in its original order.
Remove empty lines
Remove blank lines from text, optionally including lines that contain only spaces, tabs, or other whitespace.
Remove invisible characters
Remove selected hidden characters from text, with explicit options for joiners, direction marks, and nonbreaking spaces.
Sort lines
Sort a list alphabetically or in natural number order, ascending or descending, while preserving duplicates.
Text diff
Compare two texts line by line and download a readable report of added, removed, and unchanged lines.
Trim whitespace
Trim leading, trailing, or both sides of whitespace on every line or around the entire text.
Word counter
Count words, Unicode characters, lines, and paragraphs in your text, with a downloadable count report.
Word frequency
Count repeated words, inspect the most frequent tokens, and download the complete word-count table as CSV.
Web & SEO
Meta tag generator
Write page titles and descriptions with an illustrative search preview and escaped HTML export.
Query string editor
Edit query parameters as rows, preserve repeated names, and build an encoded URL with a live preview.
Robots.txt generator
Build crawler groups and allow/disallow rules with a live robots.txt preview and presets.
Sitemap generator
Build a sitemap from page URLs with date validation, duplicate removal, and a live XML preview.
Social card preview
Preview wide and compact sharing cards, write Open Graph metadata, and export safe HTML tags.
URL parser
Break a URL into its components, inspect repeated query parameters, and resolve relative paths.
URL slug generator
Turn a title into a readable URL slug with Unicode, separator, case, and length controls.
UTM campaign builder
Create campaign links with presets, optional tracking values, and an exact live URL preview.