Developer Utilities

Online Developer Tools

Free developer tools that run in your browser: format JSON, convert XML, compress images and PDFs, compare text. Most tools need no upload or signup.

Viewers & Editors

Markdown Viewer & Editor

Preview and edit Markdown with live visualization.

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SVG Viewer

View and edit SVG in the browser: paste code or open an .svg file, check the live preview with zoom, format or minify the markup, then copy or download it.

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HTML Viewer

Open an .html file or paste markup and see the rendered page live beside the code.

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OPML Viewer

Open OPML files online and view the outline tree and RSS feed links.

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CSV Viewer

Open, edit and export CSV files with any delimiter.

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Open & View XML Files Online

Open a .xml file in your browser with no software: collapsible tree of elements and attributes, formatting, and syntax errors with line and column. Nothing is uploaded.

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MXML Viewer

View, format, and analyze MXML files.

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GIF Viewer

Open animated GIFs online, pause and step through frames, read frame count, duration and delays, and save frames as PNG or one ZIP.

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Online BBCode Editor

Format BBCode from a toolbar, preview it live and export HTML — 34 forum tags, nothing uploaded.

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YAML Viewer

A free online tool to view, validate, and convert YAML to JSON. Perfect for configuration files and data serialization.

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Online RSS Reader

Subscribe to feeds and read them in one timeline, or paste RSS/Atom XML to inspect its structure and parsed JSON.

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LaTeX to JSON

Convert LaTeX tables to JSON arrays or objects.

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Image & Chart Tools

Tiny Image Compressor

Smart PNG/JPG compression. Reduce file size up to 80%.

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App Icon Generator

Generate app icons for iOS, Android, Web, and Desktop.

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JPG Converter

Convert images (PNG, WebP, etc.) to JPG format.

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PNG Converter

Convert images (JPG, WebP, etc.) to PNG format.

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BMP Converter

Convert images (JPG, PNG, etc.) to BMP format.

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Icon Converter

Convert images (JPG, PNG, etc.) to ICON format.

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WebP Converter

Convert images (JPG, PNG, etc.) to WebP format.

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Data Converters

Gzip Compress

Compress or decompress text and files with a free online Gzip tool.

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Gunzip Decompress

Open and extract .gz files or Base64 gzip strings online.

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Archive Extractor

Open 7Z, ZIP, RAR, TAR, ISO, DMG and more online with a browser-based extractor.

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Compress PDF

Reduce PDF file size efficiently.

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Merge PDF

Merge multiple PDF files into one ordered document.

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Split PDF

Split one PDF into separate pages or custom page ranges.

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OPML to JSON

Convert OPML outlines to JSON.

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MediaWiki to JSON

Convert MediaWiki tables to JSON arrays or objects.

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HTML to JSON

Convert HTML structure to JSON tree.

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CSV to JSON

Convert CSV rows to JSON objects.

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JSON to CSV

Convert JSON data into clean CSV output.

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JSON to Excel

Convert JSON to a downloadable .xlsx Excel file in your browser.

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Excel to JSON

Convert Excel spreadsheets to JSON.

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SQL to JSON

Convert SQL INSERTs to JSON objects.

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MySQL to JSON

Convert MySQL INSERTs to JSON objects.

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Markdown to JSON

Convert Markdown AST, tables, and frontmatter to JSON.

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LaTeX to JSON

Convert LaTeX tables to JSON arrays or objects.

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URL to JSON Converter

Parse a URL's protocol, host, port, path and query parameters into structured JSON.

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YAML to JSON

Convert YAML to JSON or JSON to YAML.

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XML to JSON

Convert XML string to JSON object.

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JSON to XML

Convert JSON object or array to XML online with formatted output.

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CSV Viewer

Open, edit and export CSV files with any delimiter.

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Env to JSON

Convert .env files to JSON with type inference and nested keys.

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JSON to Env

Convert JSON objects to .env KEY=VALUE format with dotted-key flattening.

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Properties to JSON

Convert Java .properties files to JSON with nested dotted keys and type inference for numbers and booleans.

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JSON to Properties

Convert JSON objects to Java .properties format with dotted-key flattening.

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Developer Utilities

JSON Compare & Diff

Compare JSON objects and find differences.

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JSON Formatter & Validator

Format, validate, and visualize JSON data.

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HTML Minifier/Formatter

Minify or format HTML text with 2/4-space indent.

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CSS Minifier/Formatter

Compress or format CSS code.

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JS Minifier/Formatter

Compress or format JavaScript code.

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XML Minifier/Formatter

Minify or format XML text.

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Encode & Decode

Base64 Converter

Encode/Decode text and files with real-time conversion.

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Base32 Converter

Encode and decode Base32 data.

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Base58 Converter

Encode and decode Base58 data.

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URL Encode / Decode

Encode or decode percent-encoded URL text instantly for query strings, redirect URLs, and API parameters.

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Base64 to Image

Convert Base64 strings to images.

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Image to Base64

Convert images to Base64 strings.

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Color Tools

Color Converter

Convert RGB, RGBA, HEX, HSL, HSLA, HSV, HSVA, CMYK, and CMYKA with live sync.

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OKLCH Color Converter

Convert OKLCH, OKLab, RGB, HSL, and HEX with live sync. CSS Color 4 gamut mapping and Tailwind v4 palette.

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Unit & General Converters

Unix Timestamp Converter

Convert Unix timestamp to date and date to Unix timestamp in seconds, milliseconds, ISO 8601, UTC, and local time.

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Cryptography

JWT Decoder & Inspector

Decode JWT headers and payloads, inspect claims, and check exp, iat, and nbf locally in your browser.

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Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-512 hashes online. Real-time, client-side only.

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String & Text

Text Compare & Diff

Compare text and find differences line-by-line.

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Markdown Viewer & Editor

Preview and edit Markdown with live visualization.

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Multilingual Slug Generator

Turn text into URL slugs, transliterating Chinese to pinyin, Japanese kana to romaji and Cyrillic to Latin.

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Network & IP

QR Code Generator

Convert URL to QR code online. Choose size, colours and a centre logo, download PNG or SVG. Free, client-side only.

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Random Generators

UUID Generator

Generate UUID v4 or v7 in bulk, in any case, with or without hyphens. Client-side only.

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Password Generator

Generate strong random passwords online — custom length, character sets. Free, client-side only.

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Free Online JSON, PDF, Image & Code Tools

Use fast browser-based developer tools for JSON conversion, PDF workflows, image compression, text diffing, and everyday coding tasks without uploads.

Privacy First

All data processing happens locally in your browser. Your sensitive JSON, XML, or images never leave your device.

Blazing Fast

Experience zero-latency conversions and formatting powered by modern client-side technologies.

Developer Focused

Clean interfaces, dark mode support, and keyboard shortcuts tailored for professional developers.

About Developer Tools

This site brings together practical utilities for data conversion, file compression, code formatting, and content preview. From image optimization and app icon generation to working with XML, JSON, Gzip, and PDF, everything runs locally in your browser so your files stay on your device.