ShotMarkPre-launch

Free tools

Free tools for people who build and break software.

68 developer and QA utilities: formatters, encoders, diff tools, generators, and more. No signup, no limits.

Runs in your browser Nothing leaves your machine Built by ShotMark

ROI Calculator

See what faster, agent-ready bug fixing is worth to your team. No signup required.

Bug Severity Calculator

A weighted scoring model for triage: user impact, frequency, workaround, release exposure.

JSON Formatter & Diff

Paste two JSON payloads and see the real diff with collapsible tree, key search, and copy-as-JSON-path.

JSON Validator

Paste JSON and instantly see if it's valid, with the exact line and character of any error.

JSON Minifier

Strip whitespace and compress JSON to its smallest valid form.

JSON Compare

Deep-compare two JSON objects and highlight added, removed, and changed keys.

JSON ↔ YAML Converter

Convert between JSON and human-readable YAML in either direction.

JSON ↔ CSV Converter

Convert JSON arrays to CSV and back. Configure delimiter and headers.

JSON ↔ XML Converter

Convert JSON data to properly formatted XML and back.

JSON to TypeScript

Generate TypeScript interfaces from any JSON object, paste, get types.

YAML Formatter

Format YAML with consistent indentation and spacing.

SQL Formatter & Beautifier

Format SQL queries with standard indentation and keyword capitalization.

Markdown Formatter

Beautify Markdown, normalize headings, lists, and code blocks.

TypeScript Formatter

Format TypeScript code with Prettier-standard styling.

GraphQL Formatter

Format GraphQL schemas and queries with clean indentation.

Python Formatter

Normalize Python indentation and whitespace toward PEP 8.

PHP Formatter

Format PHP code with PSR-12 conventions.

HTML Prettify

Format and beautify HTML with consistent indentation.

CSS Prettify

Beautify CSS with tidy indentation and line breaks.

XML Prettify

Pretty-print XML with clear indentation.

JavaScript Minifier

Minify JavaScript by removing whitespace and shortening identifiers.

CSS Minifier

Minify CSS by removing whitespace and comments.

HTML Minifier

Minify HTML by removing whitespace and comments.

SQL Minifier

Minify SQL by stripping comments and extra whitespace.

XML Minifier

Minify XML by removing redundant whitespace.

Base64 Encoder / Decoder

Encode text or files to Base64 and decode Base64 back to plaintext.

URL Encode / Decode

Encode text for safe URL use, or decode percent-encoded URLs.

JWT Decoder

Decode JWT tokens into header, payload, and signature without a secret.

HTML Escape / Unescape

Convert special characters to HTML entities and back.

JavaScript Escape

Escape special characters for safe use inside JavaScript strings.

Strip HTML Tags

Remove all HTML tags from markup, leaving clean plain text.

ROT13 Encoder / Decoder

Encode or decode text with ROT13, same operation in both directions.

IDN Encode / Decode

Convert Unicode domain names to Punycode (IDNA) and back.

String Difference Checker

Compare two strings and see additions, deletions, and changes.

Code Compare

Side-by-side diff for any two code blocks.

XML Compare

Structure-aware diff of two XML documents.

Text Compare

Compare plain text in line or word mode.

Regex Tester

Test JavaScript regular expressions with flags and live match highlighting.

HTML Validator

Validate HTML markup and get a list of errors with line references.

CSS Validator

Validate CSS rules and get actionable error messages.

JavaScript Validator

Lint and validate JavaScript for syntax errors.

Credit Card Validator

Validate credit card numbers using the Luhn algorithm.

HTML Viewer

Preview HTML markup in a sandboxed live viewer.

JavaScript Live Tester

Write and run JavaScript with a live console output panel.

UUID / GUID Generator

Generate RFC 4122 v4 UUIDs in bulk.

Random CSV Generator

Create sample CSV data with configurable columns and types.

Random Address Generator

Generate realistic addresses for test data.

QR Code Generator

Create QR codes from text or URLs and download as PNG.

Random Password Generator

Generate secure passwords with configurable length and character sets.

Random String Generator

Generate random strings with configurable alphabet and length.

Text From Regex

Generate strings that match a given regular expression.

Lorem Ipsum Generator

Generate placeholder text by paragraph, sentence, or word count.

Placeholder Image

Create placeholder images with custom size, color, and text.

Bcrypt Generator

Generate bcrypt hashes with configurable salt rounds.

API Key Generator

Generate cryptographically random API keys.

Crontab Generator

Build cron expressions visually with a human-readable description.

HAR Viewer

Drop a .har file and get a network timeline. Filter by status, method, or slow requests.

URL Parser

Decompose a URL into components and edit query params interactively.

Unix Timestamp Converter

Convert Unix timestamps to readable dates and back. Supports seconds and milliseconds.

User Agent Detector

See your full user agent string and a parsed breakdown of browser, OS, and device.

Browser Info

Detect browser name, version, language, and capabilities.

Browser Size

View live viewport dimensions, window size, and device pixel ratio.

Local IP Address

Discover your local IPv4 and IPv6 addresses via WebRTC.

Internet Speed Test

Measure download speed, upload speed, latency, and jitter.

IPv4 Subnet Calculator

Calculate network address, broadcast, host range, and mask from an IP/CIDR.

PX ↔ REM Converter

Convert pixel values to rem and back using a configurable base font size.

Hex ↔ RGB Converter

Convert HEX color codes to RGB/RGBA and back, with live color preview.

Color Picker

Pick any color with a visual picker and get HEX, RGB, and HSL values.

Like these tools?

ShotMark captures what you do here, in one click.

The network traces, payload diffs, and regex tests you run on this page? ShotMark automates all of it and feeds the context straight to your AI agent.

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