Browser toolbox

All tools

Focused utilities for local data, text, files, security, time, and clearly sourced live information.

Browse by category

12 categories

All categories 118 Developer 14 Web & network 18 DevOps & cloud 8 Data & analysis 15 Security 17 Encoding 5 Text 5 Document 6 Files & media 7 Images & design 11 Date & time 4 Productivity 8

All categories

118 tools available

Showing 118/118 tools · All categories

JSON Formatter & Validator

Format, minify, and validate JSON with useful error locations.

Developer

Base64 Encoder & Decoder

Encode Unicode text or decode standard and URL-safe Base64.

Encoding

URL Encoder & Decoder

Encode URL components, decode escaped text, and inspect full URLs.

Encoding

Unix Timestamp Converter

Convert Unix seconds or milliseconds to readable dates and back.

Date & time

UUID v4 Generator

Generate one or many cryptographically strong UUID v4 identifiers.

Developer

SHA Hash Generator

Calculate SHA-256, SHA-384, or SHA-512 for text and local files.

Security

JWT Decoder

Inspect a JWT header, payload, and time claims without sending the token anywhere.

Security

Text Toolbox

Edit, analyze, and transform plain text in a focused browser workspace.

Text

Text Diff Checker

Compare text, code, documents, or folders with precise local diffs.

Text

Regex Tester, Debugger & Visualizer

Test, explain, visualize, secure, and benchmark regular expressions locally.

Developer

JavaScript & HTML Playground

Write HTML, CSS, and JavaScript with a sandboxed preview and captured console.

Developer

Markdown Editor & Preview

Write, inspect, preview, and export professional Markdown documents locally.

Text

PDF Editor & Toolbox

Organize, edit, sign, redact, convert, OCR, and inspect PDFs locally.

Document

Archive & Compression Toolbox

Create, browse, extract, encrypt, convert, and inspect archives locally.

Files & media

Pomodoro Timer & Focus Tracker

Plan tasks, run reliable focus cycles, and understand your local focus history.

Productivity

Online Timer & Multi-Timer

Run accurate countdowns, multiple timers, stopwatch laps, and interval sequences in your browser.

Productivity

World Clock & Meeting Planner

Compare world clocks, convert DST-safe times, plan meetings, and share international events locally.

Date & time

Public Holiday & Workday Planner

Explore international holidays, calculate business days, plan leave, and find shared workdays locally.

Productivity

Password Generator & Strength Checker

Create passwords, passphrases, PINs, and random tokens with Web Crypto, then inspect strength locally.

Security

Image Editor & Batch Optimizer

Edit, resize, convert, inspect, and batch-optimize images without uploading them.

Images & design

AI Background Remover & Mask Editor

Remove and replace image backgrounds locally with repairable alpha masks and no image upload.

Images & design

DNS Toolbox & Record Inspector

Query DNS records, TTL, resolver status, and DNSSEC signals with practical diagnostics.

Web & network

Currency Converter & Exchange Rate Tracker

Convert multiple currencies and explore sourced reference-rate history in one clear workspace.

Data & analysis

DOI Citation Generator

Resolve, format, organize, and export DOI citations with source metadata from Crossref.

Data & analysis

Package & Dependency Risk Inspector

Inspect versions, licenses, dependency graphs, and known OSV vulnerabilities across package ecosystems.

Data & analysis

QR Code & Barcode Generator

Create, scan, customize, and batch-export QR codes and common barcodes locally.

Encoding

Color & Accessibility Toolkit

Check WCAG contrast, repair color pairs, build palettes, and extract image colors locally.

Images & design

CSV & Data Analyzer

Inspect, filter, profile, clean, chart, and convert CSV or JSON data without uploading it.

Data & analysis

Weather & Air Quality Planner

Explore hourly forecasts, air quality, and transparent activity scores for any location.

Data & analysis

SVG Editor & Optimizer

Edit, inspect, optimize, sanitize, batch, and export SVG assets locally.

Images & design

JSON Schema Validator & Mock Data Generator

Validate, infer, build, compare, mock, and convert JSON Schema and OpenAPI models.

Developer

Cron & Recurrence Rule Planner

Build, explain, compare, and preview Cron and RFC 5545 recurrence schedules.

Date & time

Global Earthquake Monitor

Explore current USGS earthquakes on a filterable world map with local alerts and exports.

Data & analysis

Config Format Converter & Validator

Convert, format, query, inspect, and compare YAML, JSON, TOML, XML, and INI locally.

Developer

IP, CIDR & Subnet Planner

Calculate IPv4 and IPv6 networks, split CIDRs, summarize ranges, and allocate VLSM plans.

Web & network

SQL & Parquet Data Analyzer

Query CSV, JSON, NDJSON, and Parquet files locally with DuckDB-Wasm.

Data & analysis

Global Indicators Explorer

Compare World Bank economic, population, health, education, climate, and technology indicators.

Data & analysis

Log & Incident Explorer

Search, correlate, cluster, chart, and safely redact structured or plain-text logs.

Data & analysis

OpenAPI Editor & Contract Tester

Design, validate, document, mock, generate code, and compare OpenAPI contracts locally.

Web & network

GeoJSON Viewer & Coordinate Converter

View, draw, validate, simplify, convert, and export geographic data without map tracking.

Data & analysis

Email Header & Phishing Analyzer

Inspect message routes, authentication assertions, risky links, attachments, and privacy-safe reports.

Security

API Request Tester

Compose, send, inspect, save, and reproduce HTTP API requests from one workspace.

Web & network

Data Transformation Builder

Build repeatable local pipelines for structured data, text, encodings, compression, and hashes.

Data & analysis

Web Security Headers & CSP Checker

Audit response headers, CSP, cookies, and CORS, then generate practical deployment fixes.

Security

Certificate, CSR & Key Inspector

Inspect X.509 certificates, CSRs, keys, chains, and PKCS#12 containers entirely in-browser.

Security

GraphQL Query & Schema Explorer

Run, validate, document, and reproduce GraphQL operations with live or imported schemas.

Web & network

OAuth 2.0, OIDC & PKCE Debugger

Build a safe PKCE flow, parse callbacks, inspect claims, and verify JWT signatures with JWKS.

Security

WebSocket & SSE Tester

Open real realtime connections, inspect traffic, measure sessions, reconnect, and export evidence.

Web & network

Webhook Signature & Payload Tester

Generate and verify byte-exact webhook HMAC signatures with provider presets and test cases.

Security

HAR Network & Performance Analyzer

Inspect request waterfalls, bottlenecks, payloads, caching, failures, and before/after captures locally.

Web & network

AsyncAPI Editor & Validator

Validate, explore, sample, migrate, and compare AsyncAPI event-driven contracts.

Web & network

OpenTelemetry Trace Explorer

Explore OTLP, Jaeger, and Zipkin traces as waterfalls, service edges, diagnostics, and comparisons.

Data & analysis

Protobuf & gRPC-Web Tester

Compile proto schemas, encode and decode messages, inspect wire fields, compare contracts, and call gRPC-Web.

Web & network

Passkey & WebAuthn Tester

Run real passkey ceremonies, decode credential evidence, verify assertions, and inspect browser support.

Security

Kubernetes Manifest Validator

Inspect multi-document manifests, resource relationships, security risks, CRDs, diffs, and kubectl commands.

DevOps & cloud

GitHub Actions Workflow Validator

Visualize workflow DAGs and matrices, review actions and expressions, find risks, and compare CI changes.

DevOps & cloud

SAML SSO Debugger

Decode SAML messages and HAR evidence, evaluate assertions, inspect metadata, verify signatures, and compare configurations.

Security

Container Build File Checker

Review Dockerfiles, Compose services, build stages, ignored files, security risks, and reproducible checks.

DevOps & cloud

Terraform & OpenTofu Validator

Map HCL resources and references, review IaC risks, redact Plan JSON, and compare destructive changes.

DevOps & cloud

Helm & Kustomize Validator

Review chart values, render a safe Helm subset, build common Kustomize overlays, and inspect resulting resources.

DevOps & cloud

SBOM Supply Chain Explorer

Validate CycloneDX, SPDX and Syft SBOMs, explore dependencies, compare releases, and optionally query OSV.

Security

Office Document Privacy Checker & Repair Tool

Inspect DOCX, XLSX and PPTX packages, reveal hidden data, and export a deliberately cleaned copy.

Document

EPUB Editor & Validator

Validate EPUB structure, reading order, navigation, resources, accessibility, metadata, and export a normalized book.

Document

Content Credentials & Media Provenance Checker

Verify C2PA manifests locally, inspect recorded actions and ingredients, compare media, and flag sensitive metadata.

Security

Binary File & Hex Inspector

Inspect bytes, signatures, parsed structures, strings, entropy, hashes, searches, and binary differences.

Files & media

SQLite Database Viewer & Editor

Open, query, edit, validate and export SQLite databases locally with schema and integrity diagnostics.

Data & analysis

Subtitle Editor & Format Converter

Edit, synchronize, validate, preview and convert SRT, WebVTT, ASS, LRC, SBV and TTML locally.

Text

Font & Glyph Inspector

Inspect OpenType tables, preview glyphs and variable axes, test character coverage, compare fonts, and generate CSS.

Images & design

PCAP Network Analyzer

Inspect PCAP and PCAPNG traffic locally with packet decoding, conversations, DNS, HTTP, TLS and privacy findings.

Security

Media File Inspector

Inspect media containers, codecs, tracks, color, audio, subtitles, privacy metadata, and file differences locally.

Files & media

Audio Waveform Editor & Loudness Analyzer

Analyze waveform, estimated LUFS and true peak, find audio quality issues, edit levels and export WAV locally.

Files & media

3D Model Viewer & Mesh Repair Tool

View, measure, inspect, compare, repair and export STL, OBJ, PLY, glTF, GLB and 3MF meshes locally.

Files & media

ICS Calendar Editor & Validator

Create, edit, merge, deduplicate, validate and export ICS calendars with recurrence and conflict analysis.

Date & time

Video Frame Extractor & Storyboard Maker

Extract exact video frames, detect scene changes, arrange storyboards and export contact sheets locally.

Files & media

EML & MIME Email Analyzer

Inspect raw EML messages, MIME trees, safe bodies, delivery claims, links and attachments without uploading mail.

Security

MIDI Piano Roll Editor

Open, edit, audition, quantize and export Standard MIDI files in a visual browser piano roll.

Files & media

Web Accessibility Checker & Repair Guide

Audit local HTML with axe-core, inspect WCAG findings, compare baselines and plan practical repairs.

Web & network

Favicon & PWA Icon Generator

Design, audit and export complete favicon, app-icon and social-card packages locally.

Images & design

Database Schema & ER Diagram Designer

Parse, edit, visualize, compare and export SQL or DBML database schemas in the browser.

Data & analysis

Document Scanner & OCR Converter

Clean local scans, recognize English or Chinese text and export searchable documents without upload.

Document

Git Repository & Patch Reviewer

Review diffs, patch revisions, risks and local repository history without sending code to a server.

Developer

Invoice, Quote & Receipt Generator

Create polished business documents, calculate totals and export private PDFs without an account.

Productivity

Resume Builder & ATS Checker

Build job-specific resumes, explain ATS checks and export private application documents locally.

Document

Whiteboard, Flowchart & Mind Map Editor

Sketch, connect, auto-layout and export editable diagrams on a private browser canvas.

Productivity

Screen Recorder & Product Demo Maker

Record screen, camera and audio into a styled local demo without uploading media.

Productivity

Screenshot Beautifier & Device Mockup Generator

Turn local screenshots into polished product, social and app-store visuals without uploading them.

Images & design

Chart & Infographic Maker

Turn CSV or JSON into accessible, branded charts and publication-ready visual stories locally.

Images & design

Presentation & Pitch Deck Maker

Build, present and export polished multi-slide decks in a private local workspace.

Productivity

Private Kanban & Project Roadmap

Plan tasks across boards, calendars and timelines with offline local storage and open exports.

Productivity

Photo Metadata & Geotag Privacy Checker

Inspect, edit, batch-clean and verify private EXIF and GPS details without uploading photos.

Images & design

Unicode, Invisible Character & Text Security Inspector

Explain code points, graphemes, normalization, hidden controls and lookalike text locally.

Encoding

Readability & Writing Quality Checker

Analyze English and Chinese clarity, explain sentence issues and compare drafts without remote AI.

Text

Email Signature & Digital Business Card Generator

Design safe HTML signatures, vCards and team packs with local compatibility checks.

Document

SEO Metadata & Structured Data Checker

Build, inspect and audit page metadata, JSON-LD, robots.txt and sitemaps locally.

Web & network

Sensitive Data, PII & Secret Redactor

Find, review and consistently redact secrets and personal data without uploading source text.

Security

Visual Regression & Image Diff Checker

Compare screenshots pixel by pixel, ignore reviewed regions and export reproducible evidence locally.

Images & design

i18n Resource & Localization QA Checker

Compare resources, find placeholder and key defects, pseudo-localize and convert formats locally.

Developer

Screen Dead Pixel & Uniformity Test

Inspect dead, bright or stuck pixels and screen uniformity with local full-screen color patterns.

Images & design

Test Data & Fixture Generator

Generate deterministic, locale-aware and relational fixtures from visual fields or JSON Schema.

Developer

API Mock & Scenario Builder

Turn OpenAPI or HAR into success, failure and latency scenarios with reusable test handlers.

Web & network

Web Performance & Core Web Vitals Analyzer

Analyze and compare Lighthouse, Web Vitals and HAR data with explicit budgets and local reports.

Web & network

Browser Compatibility & Baseline Checker

Scan web code, evaluate Baseline and target browser support, and generate toolchain policies locally.

Web & network

JSON Query & Transformation Tool

Query JSON, YAML and JSONL locally, inspect canonical paths and export structured results.

Developer

Pairwise Test Matrix Generator

Generate deterministic 1-way, pairwise or 3-way test suites with exclusion constraints.

Developer

Redirect & URL Migration Checker

Design, simulate and audit ordered redirect maps before a site migration.

Web & network

HTTP Cache Simulator & CDN Policy Generator

Simulate HTTP cache freshness, audit headers and generate reviewable CDN policies.

Web & network

JavaScript Bundle & Source Map Analyzer

Inspect bundle composition, Source Maps, budgets and build deltas without executing imported code.

Developer

Static Site Deployment Checker

Audit a build directory or ZIP for routes, broken links and Cloudflare Pages configuration locally.

DevOps & cloud

Design Token & CSS Theme Editor

Edit, resolve, preview and export DTCG design tokens and CSS themes locally.

Developer

Prometheus Metrics & Alert Rule Analyzer

Parse OpenMetrics, inspect cardinality, test common PromQL and review alert rules locally.

DevOps & cloud

API Contract Diff Checker

Compare OpenAPI, AsyncAPI or GraphQL versions and explain breaking changes locally.

Web & network

Infrastructure Plan Reviewer

Review redacted Terraform plan JSON and Kubernetes changes with practical risk policies.

DevOps & cloud

Email Authentication & Domain Health Checker

Audit SPF, DKIM, DMARC, BIMI and transport policies with optional DNS lookup.

Security

Open Source License Compliance Checker

Review dependency licenses, SPDX expressions, policy decisions and attribution gaps locally.

Security

Engineering Unit & Formula Calculator

Convert engineering quantities, solve dimensional formulas and batch-process values locally.

Data & analysis

Programmer Calculator & Binary Inspector

Calculate integers, edit bits, inspect endianness and decode IEEE 754 values.

Encoding

LLM Token Counter & Context Calculator

Count tokens, compare encodings, budget messages and split prompts with local tiktoken.

Developer

WebRTC Camera, Microphone & Call Test

Test camera, microphone, screen sharing and local WebRTC quality before a call.

Web & network