Online Developer Tools | InsightsWeave

JSON & Data Tools

JSON Formatter

Format valid JSON with 2 or 4 spaces and pinpoint common syntax errors.

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JSON Validator

Validate JSON syntax with a clear status, error reason, and precise location.

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JSON Minifier

Compact valid JSON into a single line and compare its size with the original.

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JSON Viewer

Switch between raw JSON and a collapsible tree with clear value-type highlighting.

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JSON → CSV

Convert arrays of objects to standard CSV with correct quoting, commas, line breaks, and missing fields.

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CSV → JSON

Parse CSV using RFC 4180 conventions, including quoted commas, line breaks, and escaped quotes.

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XML & YAML Tools

XML Formatter

Check and format XML while preserving attributes, comments, and CDATA.

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XML → JSON

Convert XML to JSON with clear rules for attributes, text, and repeated elements.

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JSON → XML

Recursively convert objects and arrays, escape text, and reject invalid XML tag names.

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YAML → JSON

Convert YAML to JSON with support for common objects, arrays, scalars, and YAML 1.2 syntax, with clear syntax error messages.

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JSON → YAML

Turn standard JSON into readable YAML with correct handling for objects, arrays, and scalar values.

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Encoding & Text Conversion

Base64 Encode

Encode UTF-8 text as Base64 with support for international characters and emoji.

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Base64 Decode

Validate Base64 input and decode it back into multilingual Unicode text.

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URL Encode

Encode international text and special characters in URL Component or Full URL mode.

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URL Decode

Decode percent-encoded text and report incomplete or invalid sequences clearly.

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Hex → Text

Strictly parse hexadecimal bytes and restore to multilingual text as UTF-8.

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Text → Hex

Encode Unicode text into UTF-8 bytes and output in three common hexadecimal formats.

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Binary → Text

Parses binary strictly as 8-bit bytes and decodes to readable text using UTF-8.

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Text → Binary

Encode Unicode text into UTF-8 bytes, and then output a fixed eight-bit binary.

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ASCII Converter

Convert between characters, ASCII decimal, hexadecimal, and binary, and mark non-ASCII characters.

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Unicode Converter

View encoding information one by one Unicode Code Point, and support U+ and JavaScript escape and reverse conversion.

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HTML Entity Encoder

Encode special characters commonly found in HTML, and optionally convert non-ASCII characters into numeric entities.

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HTML Entity Decoder

Decode named and numeric HTML entities and display the result as plain text.

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Developer Utilities

Regex Tester

Test JavaScript regular expressions and inspect matches, indexes, and capture groups. Tests that take too long stop automatically.

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UUID Generator

Generate 1–100 cryptographically random UUID v4 values with case and hyphen options.

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Unix Timestamp Converter

Convert between Unix seconds, milliseconds, and dates with device time zone, UTC, and ISO output.

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Code Formatters

HTML Formatter

Format HTML documents and snippets with 2- or 4-space indentation, organizing tags, attributes, and supported embedded content.

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CSS Formatter

Format CSS selectors, media queries, keyframes, comments, calc(), and custom properties with 2- or 4-space indentation.

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JavaScript Formatter

Format modern JavaScript, including classes, optional chaining, template literals, and async/await, without executing your code.

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SQL Formatter

Format queries for Standard SQL, MySQL, PostgreSQL, or SQLite.

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Code Minifiers

HTML Minifier

Minify HTML, remove unnecessary whitespace and comments, and compare original size, result size, and savings.

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CSS Minifier

Minify CSS with support for selectors, strings, calc(), and custom properties, and compare file sizes and savings.

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JavaScript Minifier

Minify modern JavaScript and shorten local variable names, with syntax errors, original size, result size, and savings shown.

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Hash & Security Tools

SHA256 Generator

Generate a 64-character hexadecimal SHA-256 hash for UTF-8 text, choose uppercase or lowercase, and copy the result.

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SHA512 Generator

Generate a 128-character hexadecimal SHA-512 hash for UTF-8 text, choose uppercase or lowercase, and copy the result.

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MD5 Generator

Generate a 32-character hexadecimal MD5 hash for UTF-8 text for compatibility checks with older systems, not for security.

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File Hash Calculator

Select a local file and calculate SHA-256, SHA-512 or MD5 within the browser, no upload required.

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JWT Decoder

Locally decodes JWT Header and Payload, and interprets common Unix time claims; does not verify signatures.

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Basic Auth Generator

Generate Basic Authorization Header securely in UTF-8, with the caveat that Base64 is not encryption.

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Cron & Time Expressions

Cron Generator

Generate standard five-field crons with common scheduling options and simultaneously display natural language explanations.

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Cron Parser

Validates and interprets standard five-field cron, supporting asterisk, list, range and step syntax.

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URL & HTTP Tools

Query String Parser

Parse a query string while preserving repeated parameters, empty values, and standard percent-encoding behavior.

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Query String Generator

Generates a correctly encoded Query String from multi-line key-value parameters, allowing duplicate Keys.

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URL Parser

Break down a full or relative URL into protocol, host, port, path, query parameters, and fragment. Relative addresses need a base URL.

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Cookie Parser

Parses the pasted Cookie Header and displays the original value and secure decoding results side by side.

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HTTP Header Parser

Parses plain text HTTP headers, preserving colons in repeated fields and values, and outputs JSON.

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HTTP Request Helpers

Curl Generator

Generates correctly escaped cURL commands from structured request information, but does not execute the request.

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Curl → Fetch

Safely parse common cURL commands into fetch code and explicitly report unsupported options.

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Fetch → Curl

Convert supported fetch calls into cURL commands you can copy, without running your code.

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File Type Tools

MIME Type Lookup

Look up MIME types by file extension, find extensions for a MIME type, or search by keyword.

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Network & IP Calculation Tools

IPv4 Validator

Strictly validate A.B.C.D notation, the 0 to 255 range, and leading-zero rules, then view each octet and the 32-bit binary representation.

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IPv6 Validator

Validate full, compressed, and IPv4-mapped IPv6 addresses and view expanded and normalized compressed forms.

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IPv4 → Binary

Convert the four decimal IPv4 octets to fixed-width 8-bit binary, with both dotted and continuous output.

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Binary → IPv4

Validate exactly 32 binary digits, then convert continuous, dotted, or whitespace-grouped binary input to IPv4.

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CIDR Calculator

Calculate the subnet mask, network and broadcast addresses, address range, and host counts from an IPv4 address and CIDR prefix.

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Subnet Calculator

Perform comprehensive subnet calculations using a CIDR prefix or contiguous subnet mask, including boundaries, bit counts, and the host range.

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Subnet Mask Calculator

Convert between CIDR prefixes and subnet masks, with strict validation that the binary 1s and 0s are contiguous.

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IP Range Calculator

Calculate a CIDR block's start and end addresses, usable range, and counts without expanding it into a large IP list.

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Network Address Calculator

Precisely calculate the network address with IP AND Subnet Mask, and view the three-line binary operation.

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Broadcast Address Calculator

Precisely calculate the broadcast address using Network OR Wildcard, and view the binary operation.

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CSS & Front-End Development Tools

HEX → RGB

Convert 3- or 6-digit HEX to RGB with individual channel values and a color preview.

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RGB → HEX

Validate integer R, G, and B values and generate HEX, with uppercase output and a color preview.

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HEX → HSL

Convert HEX to HSL and inspect hue, saturation, lightness, and the resulting color.

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CSS Gradient Generator

Create linear or radial gradients with 2–6 color stops, adjustable positions, and angles.

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Box Shadow Generator

Adjust card shadow offsets, blur, spread, color, opacity, and inset with a live preview.

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Text Shadow Generator

Create shadows for custom text with live controls for offsets, blur, color, and opacity.

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Border Radius Generator

Adjust four corners together or independently, preview the shape, and generate border-radius shorthand.

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CSS Flexbox Generator

Adjust direction, alignment, wrapping, and gap, and preview Flexbox with real elements.

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CSS Grid Generator

Generate equal-track grids with independent row, column, and gap controls and up to 144 preview items.

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CSS Clamp Generator

Set minimum, preferred, and maximum values to generate responsive clamp() CSS with a live preview.

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px → rem

Convert px to rem with a custom root font size and practical decimal precision.

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rem → px

Convert rem to px with a custom root font size and see the formula and result.

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Aspect Ratio Calculator

Simplify width and height to an aspect ratio, or calculate a missing dimension from a ratio.

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WCAG Contrast Checker

Calculate foreground/background contrast and check all four WCAG AA and AAA text thresholds.

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CSS Filter Generator

Preview nine CSS filters live, generate a filter declaration, and restore defaults in one click.

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Text and Data Tools

Word Counter

Count characters, words, paragraphs, and sentences in real time, with language-aware word segmentation and estimated reading time.

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Character Counter

Compare Unicode code points, visible graphemes, UTF-16 length, and UTF-8 bytes to understand emoji and text encoding.

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Remove Duplicate Lines

Remove duplicate lines with explicit case and whitespace rules, keeping the first original text and its order by default.

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Remove Empty Lines

Remove empty or whitespace-only lines while preserving other lines and their surrounding spaces by default.

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Text Sorter

Sort multilingual lines by text, natural or numeric order, or character length, or shuffle them randomly.

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Text Diff

Identify added, removed, and unchanged lines, including Unicode and emoji.

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CamelCase Converter

Recognize separators and case boundaries to generate camelCase in batches while preserving Unicode letters.

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snake_case Converter

Normalize naming styles to lowercase underscores, recognizing acronyms and existing camelCase boundaries.

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kebab-case Converter

Turn phrases, camelCase names, and acronyms into lowercase words joined by single hyphens.

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CSV Viewer

Open or paste CSV locally to inspect columns and statistics, with proper quoted-field parsing and a limited table preview.

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CSV Deduplicator

Deduplicate whole CSV rows or selected columns while preserving first records, column order, and correct CSV escaping.

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CSV → Markdown

Convert CSV to a Markdown table with escaped pipes and consistent handling of cell line breaks.

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Markdown → CSV

Recognize Markdown headers, alignment rows, and escaped pipes to generate correctly quoted CSV.

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Markdown Preview

Preview Markdown headings, lists, code, and tables live, with raw HTML and remote image loading disabled.

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Markdown → HTML

Convert Markdown to copyable HTML source, with raw HTML disabled and a safe preview of the result.

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Generation and Code Structures

Random String Generator

Generate random strings of a chosen length and count using built-in or custom character sets, with an option to exclude look-alikes.

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Random Number Generator

Generate random integers or decimals within a range, with batch output, unique integer sampling, and local downloads.

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Password Generator

Generate passwords with a secure random source, require every selected category, and optionally exclude look-alikes or repeated characters.

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UUID Batch Generator

Generate UUID v4 values in batches of up to 10,000, with uppercase and hyphen options.

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QR Code Generator

Create QR codes for text or URLs locally, customize error correction, colors, and size, and download an actual-size PNG.

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Barcode Generator

Create real linear barcodes, validate formats and check digits, and download scalable SVG images.

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JSON → TypeScript

Merge all sample objects into TypeScript declarations with optional fields, unions, and nested types.

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JSON → Java

Convert JSON structure to Java classes with merged array fields, nested types, and the imports you need.

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JSON → Go Struct

Generate Go structs with exported fields and json tags, including pointers, nested objects, and slices.

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JSON → Python Dataclass

Generate Python dataclasses with unions, optional defaults, nested types, and valid field names.

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Image Conversion Tools

JPG → PNG

Convert JPG photos to PNG while keeping their pixel dimensions.

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PNG → JPG

Convert PNG to JPG with adjustable background color and quality.

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JPG → WebP

Convert JPG to WebP, adjust quality, and compare file sizes.

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PNG → WebP

Convert PNG to WebP, preserve transparency, and adjust quality.

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WebP → JPG

Convert static WebP to JPG with a custom background and quality.

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WebP → PNG

Convert static WebP to PNG while keeping transparency and dimensions.

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BMP → PNG

Convert browser-supported BMP to PNG while keeping pixel dimensions.

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BMP → JPG

Convert BMP to JPG with adjustable quality and background color.

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GIF → PNG (First Frame)

Extract a GIF’s first frame and save it as a still PNG image.

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Image → Base64

Encode an original image as Base64 while preserving its file contents.

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Base64 → Image

Decode Base64 or a Data URI into an image and download it.

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Image → Data URI

Generate a complete Data URI with the image type, ready to copy or download.

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Image Resizing & Cropping

Resize Image

Change image dimensions, with the original proportions locked by default or each side set separately.

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Change Image Width

Set a new width; the height adjusts automatically to keep the original proportions.

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Change Image Height

Set a new height; the width adjusts automatically to keep the original proportions.

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Resize Image by Percentage

Scale both dimensions by a percentage, with shortcuts for common sizes.

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Resize Image to Fit

Keep the original proportions within your maximum dimensions. Enlarging is off by default.

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Crop Image

Crop any rectangle by dragging the selection or entering precise pixel coordinates.

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Square Crop

Crop a square area, starting with the largest centered selection.

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Circle Crop

Create a circular avatar with a transparent outer area. PNG is the default output.

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16:9 Image Crop

Crop a 16:9 widescreen area directly from the original image.

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4:3 Image Crop

Crop to a locked 4:3 ratio, starting with the largest centered area.

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1:1 Image Crop

Crop to a 1:1 ratio with equal output width and height.

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Image compression

JPG Compressor

Adjust JPG quality, keep the original dimensions, and compare file sizes.

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PNG Compressor

Choose lossless optimization or fewer colors while keeping PNG transparency.

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WebP Compressor

Adjust static WebP quality while preserving dimensions and transparency.

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Image Quality Adjuster

Compare JPG and WebP quality, or choose lossless PNG output.

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Image File Size Reducer

Set a target in KB or MB and choose whether to allow resizing if needed.

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Image editing and filters

Rotate Image

Rotate clockwise, counterclockwise, or by a custom angle while keeping the full image.

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Flip Image Horizontal

Mirror an image from left to right while keeping its original dimensions.

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Flip Image Vertical

Mirror an image from top to bottom while keeping its original dimensions.

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Grayscale Image

Adjust the grayscale strength from original colors to full grayscale.

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Sepia Image

Adjust the sepia strength for a warm, vintage look.

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Blur Image

Set a blur radius to soften the entire image.

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Sharpen Image

Adjust sharpening to enhance edge contrast and apparent clarity.

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Brightness Adjuster

Adjust overall brightness. 100% keeps the original brightness.

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Contrast Adjuster

Adjust light and dark contrast. 100% keeps the original contrast.

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Saturation Adjuster

Mute or intensify colors. 100% keeps the original saturation.

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Hue Adjuster

Shift hue by angle to explore different color combinations.

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Exposure Adjuster

Simulate exposure changes in EV stops. 0 EV keeps the original appearance.

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Invert Image

Adjust color inversion while preserving transparency and dimensions.

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Pixelate Image

Choose a pixel block size while keeping the original download dimensions.

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Image Opacity Adjuster

Set overall opacity. PNG output preserves transparency by default.

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Add Border to Image

Choose border width, color, and placement, then check the final dimensions.

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Add Rounded Corners

Set one radius for all corners. Default PNG output keeps the corners transparent.

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Image watermarks and privacy

Add Text Watermark

Choose text, font, color, position, and opacity, then save the watermark in your image.

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Add Image Watermark

Choose a main image and logo, then position the watermark while keeping its proportions.

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SVG Tools

SVG Viewer

View SVG dimensions, element counts, source, and an expandable structure tree.

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SVG Preview

Adjust the background and zoom to inspect a filtered static SVG preview.

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SVG Formatter

Format SVG with 2- or 4-space indentation while preserving graphics and text.

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SVG Minifier

Choose conservative minification or further optimization and compare SVG size savings.

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SVG → PNG

Convert SVG to PNG with custom dimensions and a transparent background.

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SVG → JPG

Convert SVG to JPG with adjustable dimensions, background, and quality.

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SVG → Base64

Encode UTF-8 SVG as Base64 or a complete Data URI while preserving the original content.

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Base64 → SVG

Decode Base64 or an SVG Data URI into SVG source and a filtered preview.

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SVG Color Changer

Find fill, stroke, and gradient colors, replace matching values, and preview your palette.

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SVG Width / Height Editor

Change SVG display dimensions with the ratio locked by default, preserving viewBox and paths.

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SVG ViewBox Calculator

Read or generate viewBox values and compare coordinate ratios with display scaling.

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SVG Path Viewer

Inspect SVG paths and command counts, adjust fill and stroke, and check geometric bounds.

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SVG Background Generator

Create solid, gradient, dotted, or grid backgrounds and download an SVG at your chosen size.

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ICO, Favicon, and App Icon Tools

PNG → ICO

Convert PNG to a multi-size ICO, keep transparency, and adjust cropping and background color.

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JPG → ICO

Turn JPG photos into ICO icons. Fit the full image or crop the center and adjust padding.

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Favicon Generator

Create ICO and PNG website icons with previews, a ZIP download, and matching HTML links.

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Multi-size Favicon

Choose sizes from 16 to 512 pixels and create PNGs, a multi-size ICO, and a ZIP icon pack.

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Apple Touch Icon

Create an Apple Touch Icon with a default size of 180×180, a white background, and comfortable padding.

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Android Icon Sizes

Create common Android PNG sizes and 192/512 PWA icons, with an optional folder structure.

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Emoji → Favicon

Turn one emoji into ICO and PNG icons. Adjust its scale and background and preview small sizes.

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App Icon Generator

Create Apple, Android, PWA, and general-purpose PNG icons in an organized download package.

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Image Information and Metadata

Image Dimensions

Check width, height, aspect ratio, megapixels, and orientation, including rotated phone photos.

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Image File Size

Check the original byte count, KB/MB, KiB/MiB, file type, and pixel dimensions.

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Image DPI Viewer

View embedded DPI, density sources, conflicting values, and print dimensions.

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Image Metadata Viewer

Browse readable EXIF, IPTC, XMP, color, GPS, and other image information by category.

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EXIF Viewer

Check the camera, lens, exposure, orientation, and GPS information stored in the original photo.

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Remove Image Metadata

Save images again to remove common photo information while keeping the correct orientation.

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Image Color Analysis

Image Color Picker

Pick HEX, RGB, HSL, and alpha from original image pixels, with a pixel magnifier.

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Pixel Color Picker

Enter zero-based coordinates, move one pixel at a time, and check color and alpha.

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Dominant Color

Find the leading color group, its color codes, and its estimated share of the sample.

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Color Palette Extractor

Extract 3, 5, 8, or 10 colors and copy the color list or CSS variables.

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Average Image Color

Calculate linear-light or simple RGB averages with transparency-aware weighting.

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Image Histogram

View 256-level RGB and brightness histograms with channel ranges and statistics.

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RGB Channel Viewer

View RGB channels in color or grayscale and download PNGs with original dimensions and transparency.

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