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Calculators, numerics, date logic, statistics, and finance tools

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Image, audio, and video processing, conversion, and optimization tools

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Color, layout, graphics, visual styling, and design helper tools

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Writing, cleanup, formatting, extraction, and text analysis tools

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Developer utilities, networking, web debugging, and automation helpers

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Format, file, archive, unit, and encoding conversion tools

Professional Assembly of an Excel Workbook

PDF Repair, Cleanup, and Slimming

PDF Page Assembly and Print Preparation

PDF Signing, Stamping, and Distribution Tracing

Batch Audio Library Cleanup and Delivery

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AI Tools

Audio to Text Transcriber (AI)

Transcribe speech from audio (wav/mp3/m4a/flac/ogg/webm/aac) to text, SRT, VTT or JSON using the grok-stt AI model. Up to 10 minutes.

AI Tools

NSFW Image Content Detector

AI content-moderation classifier using NSFWJS to flag uploaded images as safe or potentially inappropriate. Built for moderation and compliance review of your own files — it analyzes uploads only and is not an image search or discovery tool. Supports JPEG/PNG/WEBP/GIF.

Compression

APNG IDAT/fdAT Chunk, Streaming Deflate Replay and Disposal Method Frame-Timing Analyzer

Upload a PNG or APNG and audit the whole animation structure: PNG signature and per-chunk CRC32 checks, IHDR bit depth / color type / interlace, acTL placement and declared frame counts, every fcTL (region bounds inside the canvas, normalized delay fractions, dispose_op none/background/previous, blend_op source/over), the shared fcTL+fdAT sequence-number contract from 0, per-frame replay of the IDAT/fdAT deflate streams with exact decompressed-size verification, and disposal-semantics audit — first-frame PREVIOUS treated as BACKGROUND, zero-delay frames, loop counts, fps and compression ratios.

Media

MIDI 1.0 / MIDI 2.0 UMP Universal MIDI Packet, Channel Voice 2.0, SysEx 7/8-bit Wire-Protocol Decoder & Byte Counter

Decode a MIDI 1.0 bytestream (status bytes, running status, System Common / Real Time, System Exclusive) or a MIDI 2.0 Universal MIDI Packet stream — message types 0x0 Utility, 0x1 System, 0x2 MIDI 1.0 Channel Voice, 0x3 SysEx 7-bit, 0x4 MIDI 2.0 Channel Voice with 16-bit velocity and the 7.9 pitch attribute, 0x5 SysEx 8-bit / Mixed Data, 0xD Flex Data, 0xF UMP Stream — with per-packet field tables, byte/word/packet counts, reserved-field validation, SysEx continuation state machines, and MIDI 1.0 ⇄ UMP translation.

Format Conversion

TOML / INI / HCL / .env / Nix / dotenv ⇄ Kubernetes ConfigMap & Secret Config Format Bridge

Convert configuration files between dotenv .env, TOML, INI, Java .properties, YAML, JSON, HCL (Terraform/Vagrant native syntax) and Nix attribute sets, and emit Kubernetes ConfigMap or Secret manifests. Template placeholders (${VAR}, {{var}}, envsubst) are preserved verbatim, type inference provenance (string/int/float/bool/list) is tracked, HCL block labels fold into nested keys, and a round-trip diff calls out non-equivalent settings — dropped keys, re-typed values and rewrites — instead of coercing them silently.

Games

Kakuro / Fillomino / Masyu / Yajilin / Hashiwokakero / Nurikabe / Slitherlink / Star Battle Puzzle Generator with Uniqueness Prover

Deterministically seeded generator for eight Nikoli logic-puzzle families — each board is grown solution-first, rendered as puzzle + solution SVGs, and verified by an exhaustive backtracking solver that counts solutions to two, so “unique” is a proof (and an exhausted budget is reported as unproven, never guessed).

Development

OpenTelemetry W3C traceparent / tracestate / baggage + OTLP Header Propagation Validator

Validate W3C Trace Context propagation headers end to end: traceparent (version / 16-byte trace-id / 8-byte parent-id / trace-flags), tracestate (≤32 list members, tenant keys), baggage (percent-encoded values + opaque properties), OTLP export Content-Type, the gRPC grpc-trace-context-bin 25-byte binary context — plus a two-header correlation round-trip with a random child span-id collision check.

Development

Tarjan SCC / Bridge / Articulation-Point Graph Decomposer with Condensation Topological Order

Decompose a directed or undirected graph with Tarjan's 1972 iterative SCC algorithm cross-checked against Kosaraju's two-pass; find articulation points and bridges via low-links; build the condensation DAG with a Kahn topological order; report cycles (nodes on cycles, self-loops) and depth-limited BFS/DFS traversals.

Media

Blues / Ragas / Maqam Microtonal Pitch-Bend Tutor — MIDI 2.0, MPE and Scala .scl Encodings

Map world tunings — 7-limit just blues, Arabic maqamat (Rast/Bayati/Hijaz/Saba) on 24-EDO quarter tones, the 22-shruti table, gamelan slendro/pelog, 31-EDO, 53-EDO and the A440 harmonic grid — onto nearest-note + RPN fine tuning, MPE 14-bit bends at ±2/±24/±48/±96 semitones, MIDI 2.0 32-bit pitch bend, the MIDI 2.0 Pitch 7.9 note attribute, and a Scala .scl export.

Finance

Rent vs Buy Total Cost of Ownership Tutor — Mortgage, Tax, Insurance, Maintenance + NPV Break-Even and IRR

Side-by-side monthly rent-vs-buy simulation: mortgage amortization, property tax, insurance, HOA and maintenance against rent plus renter insurance; the renter invests the down payment and monthly savings at an opportunity-cost rate. Outputs break-even year on net sale proceeds, per-year differential NPV, SALT-cap-aware after-tax cash flows, a differential IRR, and a ±20% tornado sensitivity chart.

Development

Windows PE / Linux ELF / Mach-O Binary Header, Section, Import & Export Inspector

Upload a PE-COFF (.exe/.dll), ELF or Mach-O binary and parse its headers end to end: DOS/PE signature, COFF machine, optional header (entry point, image base, subsystem, ASLR/NX/CFG), section table with RVA↔offset mapping, import/export directories, ELF program headers and PIE detection, dynamic symbols and DT_NEEDED, Mach-O load commands and dylibs — with cross-architecture annotations and a hex preview.

Utilities

Utility Bill Line-Item Decoder & Hidden Fee Detector (CSR/CFL/MHC/HFA Riders, Peak Demand, kWh↔Btu↔therm↔ton-hours)

Decode home and commercial electric/gas/water bills: classify tariff riders and charges (CSR/CFL/MHC/HFA-style codes, TOU on/off-peak, demand, capacity tag, decoupling), convert kWh↔Btu↔therms↔Ccf↔m³↔ton-hours with EIA factors, expose hidden fixed fees, and project annual cost with load-factor and peak-shaving savings.

Copyright-Free AAC Audio Samples

High-quality AAC encoded audio samples for testing and development, featuring nature sounds and meditation music with excellent compression

Camera RAW Photo File Samples

Downloadable sample files covering Sony ARW/SRF/SR2, Canon CR2/CR3/CRW, Adobe DNG, Nikon NEF/NRW, Fuji RAF, Olympus ORF, Panasonic RW2, Leica RAW/DNG, and a generic RAW binary file for testing camera RAW upload workflows.

Contentful Cloud-based CMS Samples

Comprehensive Contentful examples covering content modeling, API integration, webhooks, migrations, and frontend integration patterns

BDD with Cucumber - Behavior Driven Development

Comprehensive Cucumber BDD examples including feature files, step definitions, data tables, hooks, and advanced BDD patterns for collaborative development

Cypress E2E Testing Framework

Comprehensive Cypress end-to-end testing examples including test setup, page object models, API testing, visual regression testing, and advanced E2E patterns for modern web applications

Distributed Systems Patterns Samples

Comprehensive distributed systems patterns covering consistency, consensus algorithms, sharding, and fault tolerance mechanisms

Distributed Tracing Samples

Comprehensive distributed tracing examples using Jaeger, OpenTelemetry, and other modern observability tools for microservices architecture

ELK Stack Log Analysis Samples

Comprehensive ELK Stack (Elasticsearch, Logstash, Kibana) samples for log aggregation, processing, and visualization in distributed systems

Professional Assembly of an Excel Workbook

Furnish a bare spreadsheet into a workbook people can use without asking you questions — upgrade the legacy file, fill formulas down with the cells locked, name the ranges, gate inputs with validation dropdowns, let conditional formatting flag outliers, freeze the headers, build the index sheet, and set the workbook up to print.

PDF Repair, Cleanup, and Slimming

Rescue a damaged PDF, strip what should not travel with it, and cut its weight — repair broken headers and cross-reference tables with diagnostics, export annotations before erasing them, remove metadata and form fields, then downsample and recompress to hit your size target.

PDF Page Assembly and Print Preparation

Take any pile of PDF pages to a clean, printable document — straighten orientation and trim scan edges, delete or extract the pages that matter, unify every page to one paper size, choose color or grayscale for the printer, then add a cover and impose a booklet when the job is bound.

PDF Signing, Stamping, and Distribution Tracing

Send PDFs you can prove are yours — redact sensitive content permanently before sealing, add a visible signature block and a PAdES certificate signature, stamp the document status, embed invisible per-recipient tracking IDs, and audit incoming signatures down the certificate chain.

Batch Audio Library Cleanup and Delivery

Take a pile of mixed audio files to one shippable library — find and judge duplicates, convert the whole batch to a single format with deliberate encoder settings, fix the CBR or VBR bitrate policy, repair tags and filenames in bulk, and correct playback speed without touching pitch.

Deliberate Text Corruption and Mutation for Testing

Break clean text on purpose — filter, duplicate, and reverse sentences and words, inject random letters and symbols, shuffle lines and words, and prove every mutation stays controlled for parser stress tests, OCR rehearsal, and language experiments.