70 tools, arranged by intent.

JSON Repair

Fix JSON-like output from AI, logs and configs.

JSON Schema Generator

Infer JSON Schema from sample objects and arrays.

JSONPath Query

Query nested JSON and copy matched values.

CSV ↔ JSON Converter

Convert CSV to typed JSON and back.

JSON Formatter

Format, profile, sort and navigate JSON paths.

JSON to Types

Generate TypeScript, Zod, Kotlin or Swift models from JSON.

JSON Tree Diff

Compare JSON by structure and path.

/encoding

Encoding

Data URI Encoder

Encode or decode text and binary Data URI files.

Base64 Encoder / Decoder

Encode, decode and inspect Base64, Data URLs and binary files.

URL Encoder / Decoder

Percent-encode and decode URLs or components.

HTML Entity Encoder

Encode HTML by context and inspect Unicode code points.

/time

Date & Time

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/time

Unix Timestamp Converter

Convert timestamps with timezone and DST diagnostics.

/time

Cron Expression Parser

Simulate Unix, seconds and Quartz cron across timezones.

/crypto

Crypto & Hash

File Checksum

Stream, verify and export SHA checksums for local files.

Secret Scanner

Find and redact secrets before sharing text.

UUID Generator

Generate and inspect UUID v4, v5 and monotonic v7 IDs.

Hash Generator

Compute or verify SHA digests and HMAC values.

/web

Web

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Magic Paste

Detect pasted developer data and open the right tool.

cURL Converter

Convert cURL and match requests to local OpenAPI contracts.

Stack Trace Analyzer

Find actionable frames in JavaScript and Python stacks.

Workflow Builder

Chain typed transformations with searchable input branches.

JWT Lab

Inspect, verify and create JWT test fixtures.

HTTP Headers Inspector

Inspect HTTP syntax, policy conflicts and trust boundaries.

CSP Builder

Build Content-Security-Policy headers with safe defaults.

CSS Specificity Calculator

Rank CSS selectors by specificity.

Cookie Header Inspector

Parse Cookie and Set-Cookie headers, then validate policy.

Browser Storage Capability Probe

Test browser storage with write, read, and delete evidence.

Meta Tag Generator

Generate and validate SEO, Open Graph and Twitter metadata.

CSS Clamp Generator

Generate viewport or container-relative CSS clamp() values.

JWT Decoder

Decode JWT structure and claims without implying trust.

HAR Viewer

Inspect redacted HAR waterfalls in a cancelable Worker.

OpenAPI Endpoint Inspector

Resolve local refs and audit OpenAPI endpoint contracts.

/text

Text

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.env Parser

Parse dotenv files and compare schemas or private values.

Markdown Preview

Preview Markdown and copy safe HTML.

SQL Formatter

Format SQL with consistent casing and spacing.

JavaScript Regex Tester

Explain, test and regression-check JavaScript regex safely.

Text Case Converter

Convert code or prose case with locale and acronym controls.

Number Base Converter

Inspect arbitrary integers, signed widths and IEEE-754 bit patterns.

Slug Generator

Build collision-safe slugs and redirect maps.

Text Diff

Diff text by line, word or character and apply patches.

YAML / TOML / INI Converter

Convert YAML, TOML, INI and JSON configs.

Regex Visualizer

Explain regex tokens and run matches in a timed Worker.

Logfmt / NDJSON Inspector

Recover, filter and redact mixed logfmt or NDJSON lines.

/color

Color

Color Picker & Converter

Pick, tune and convert HEX, RGB, HSL and OKLCH colors.

Color Contrast Checker

Audit WCAG, APCA, component states and color vision.

Image Color Picker & Palette

Pick exact image pixels and extract production-ready palettes.

CSS Gradient Generator

Build CSS gradients and test text across every stop.

/gen

Generators

Mock Data Generator

Generate seeded nested fixtures and API edge cases.

QR Code Generator

Design QR codes with logos, badges and poster exports.

Password Generator

Generate random passwords, passphrases or rate-limited PINs.

Lorem Ipsum Generator

Generate deterministic plain, HTML or Markdown fixtures.

/media

Media

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EXIF Inspector & Cleaner

Inspect, batch-clean and verify JPEG, PNG and WebP metadata.

SVG Studio

Preview, clean and convert SVG to Data URI or JSX.

Image Optimizer

Compress images with measured fidelity and metadata proof.

Responsive Image Builder

Render responsive image files, srcset and picture markup.

LQIP Placeholder Generator

Compare blurred, dominant-color and gradient placeholders.

Favicon & App Icon Builder

Generate PNG, ICO, manifest and maskable app icons.

OG Image Studio

Design and export 1200x630 social cards.

Video Inspector

Inspect video metadata, codec evidence and poster frames.

Video Thumbnail Sheet

Export a timestamped video thumbnail sheet.

Subtitle Toolkit

Edit, split, merge and validate SRT or VTT cues.

Image Diff

Compare images by RGBA or perceptual Delta E regions.

Waveform Poster

Turn audio into a waveform cover image.

Audio Loudness Meter

Measure gated integrated LUFS, range, RMS and sample peak.

Audio Analyzer

Inspect live waveform, spectrum and audio levels.

Tone Generator

Generate test tones with common waveforms.

Mermaid / Diagram Preview

Render safe flowcharts and sequence diagrams as themed SVG.

/ref

Reference

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Browser Media Safety Guide

Check privacy, memory, cancellation and export boundaries.

read & apply

IPv4 Subnet Calculator

Calculate IPv4 network, mask, broadcast and host ranges.

Unit Converter

Convert common engineering and data units.

HTTP Status Codes

Find HTTP codes by task with retry and cache guidance.