All tools — Page 5
983 useful tools. Browse a category or search the full toolkit.
Binary File Comparator
Compare two local files byte-for-byte, reporting lengths, total mismatches and bounded differing offsets.
DataSupported JSON Schema Validator
Validate a clearly listed JSON Schema subset, rejecting every unsupported keyword and all references.
DataJSON Patch Applier
Apply bounded add, remove, replace, move, copy and test operations to a cloned JSON value.
DataNDJSON Converter
Convert a JSON array to independent JSON lines or collect NDJSON records with line-numbered errors.
DataCSV Pivot Table
Group CSV records by row and column keys and compute a bounded count, sum or mean pivot.
DataSupported CSV Data Schema Validator
Check a small declared CSV schema for column types, required cells and composite primary-key uniqueness.
DataFixed-Width Record Converter
Convert explicitly sized text records to CSV or serialize CSV into bounded fixed-width records.
DataCSV Record Comparator
Compare two CSV tables by declared key columns, ignoring record order and reporting cell changes.
DataTOML and JSON Workbench
Convert TOML configuration and JSON with explicit type compatibility checks.
DataINI Configuration Workbench
Convert INI sections and JSON configuration using a documented INI dialect.
DeveloperDotenv Inspector
Inspect and normalize environment assignments without expanding or executing values.
DataJava Properties Converter
Decode Java property escapes and continuations or export a flat JSON string map.
DeveloperProtocol Buffers Wire Inspector
Inspect Protocol Buffers tags and raw field values from hexadecimal wire bytes.
DataMessagePack and JSON Workbench
Encode JSON as MessagePack hex or decode a compatible binary document.
DataCBOR and JSON Workbench
Encode JSON as CBOR hex or decode a compatible binary document.
DeveloperJWK and PEM Public Key Converter
Convert RSA or P-256 public keys between JWK JSON and SPKI PEM locally.
DeveloperSSH Public Key Inspector
Decode an OpenSSH public key and calculate its standard SHA256 fingerprint.
DeveloperJWT Signature Verifier
Verify a JWT signature against an explicit public JWK and selected claims.
DeveloperTOTP Test Workbench
Calculate reproducible RFC6238 one-time codes from a test seed and timestamp.
DataXML XPath Tester
Evaluate bounded XPath1 location paths against local XML and inspect scalar or node results.
DeveloperCron Expression Explorer
List the next scheduled occurrences of a cron expression in a selected timezone.
DeveloperSemantic Version Range Checker
Test versions against npm semantic ranges and sort valid versions.
DeveloperGlob Pattern Tester
Test path strings against a bounded glob pattern in an isolated worker.
DeveloperGitignore Rule Tester
Evaluate ordered gitignore rules against supplied relative paths.
DeveloperURL Pattern Tester
Match URL components and inspect named URLPattern groups without fetching URLs.
DeveloperGraphQL Document Workbench
Parse and print GraphQL operations or schema documents with syntax diagnostics.
DevelopercURL and HTTP Request Workbench
Convert a safe cURL subset into an HTTP request summary without executing it.
DeveloperHTTP Header Workbench
Parse ordered HTTP fields or export a validated JSON header list.
DeveloperHTTP Cache Policy Analyzer
Calculate explicit HTTP freshness from supplied response headers and timing.
SEOContent Security Policy Auditor
Inspect an existing CSP for duplicate directives and specific source-expression risks.
DeveloperCORS Policy Tester
Evaluate a supplied CORS response against an origin, method and credentials scenario.
DeveloperWebSocket Frame Inspector
Decode one captured WebSocket frame and unmask its bounded payload.
DeveloperIP Subnet Workbench
Calculate exact IPv4/IPv6 CIDR bounds, address count and membership.
DeveloperUser Agent Inspector
Inspect a supplied user-agent string without collecting device fingerprints.
ImagesImage Palette Extractor
Estimate prominent image colors and their sampled pixel coverage locally.
ColorsColor Difference Calculator
Calculate CIELAB DeltaE76 distance between two opaque sRGB colors.
ColorsCSS Box Shadow Generator
Build validated multi-layer box-shadow CSS from explicit layer values.
DeveloperCSS Clamp Generator
Derive fluid CSS clamp sizing from two viewport and size anchor points.
ImagesSVG Path Inspector
Measure SVG path-data length and sample coordinates without mounting SVG markup.
ImagesImage Rotate and Flip
Rotate raster images by quarter turns and reflect them horizontally or vertically.
ImagesImage Watermark
Add a local text watermark with bounded opacity, size and placement.
ImagesImage Contact Sheet
Arrange local images in a numbered thumbnail grid and download one contact sheet.
ImagesImage Tile Splitter
Split a raster into an edge-aware grid of PNG tiles and a ZIP manifest.
ImagesImage Color Adjuster
Apply explicit brightness, contrast, gamma and saturation changes to raster pixels.
ImagesImage Metadata Workbench
Inspect supported image metadata or create a metadata-reduced raster copy.
ImagesImage Difference Viewer
Compare equal-size image pixels and generate a difference heatmap.
ImagesFavicon ICO Generator
Create a multi-resolution ICO favicon with validated PNG resources.
QR codesQR and Barcode Reader
Decode a QR or supported linear barcode from a local image without opening its payload.