A complete suite of free JSON utilities for developers. Every tool runs entirely in your browser — paste your JSON, get instant results, and never worry about your data being uploaded to a server.
The essential tools every developer working with JSON needs.
Pretty-print JSON with syntax highlighting and 2/4-space or tab indent. Real-time error reporting.
Strict RFC 8259 validation with exact line and column error reporting.
Compress JSON to a single line. Reduces payload size 30-60%.
Compare two JSON documents semantically — find what changed regardless of key order.
Validate JSON against a JSON Schema (Draft 7, 2019-09, 2020-12).
Run JSONPath queries against a JSON document with live results.
Bi-directional conversion between JSON and the other formats you need.
Bi-directional. Perfect for Kubernetes manifests, GitHub Actions, Docker Compose, OpenAPI specs.
Convert array of objects to CSV for Excel, Google Sheets, BI tools. Flattens nested objects with dot notation.
Bi-directional conversion preserving attributes and structure. Useful for SOAP, RSS, Atom.
Specialized JSON tooling for web authentication.
All free, all browser-based, all built with the same privacy-first approach.
Generate MD5, SHA-1, SHA-256, SHA-512, bcrypt, and 6 more cryptographic hashes.
Encode text and files to Base64 for transmission, embedding, or storage.
Decode Base64-encoded data back to plain text or binary.
URL-encode and decode query strings and URL components.
Generate and validate UUIDs in v1, v4, and v7 formats.
Test password strength and calculate entropy in real time.
Word, character, paragraph, and reading-time counts for any text.
Calculate square footage for rooms, real estate, flooring, paint, and construction projects.
Quick percentage calculations: what is X% of Y, percentage change, percentage of total.
Calculate exact age in years, months, days, hours, and minutes from a birth date.
Convert between Unix epoch timestamps and human-readable dates across any timezone.
Repeat any string a set number of times with custom separators — for testing and mock data.
Cron expression explainer and builder with plain-English output and next run times.
Regex explainer, tester, and pattern library with code in seven languages.
Engineering and scientific unit converter with printable reference cheat sheets.
Hours and timesheet calculator with overtime, breaks, and 50+ time zones.
Online alarm clock, timer, stopwatch, and world clock — all browser-based.
Convert text between Title Case, sentence case, camelCase, snake_case, kebab-case, and more.
Dimensional (billable) shipping weight for FedEx, UPS, USPS, DHL, and more carriers.
Browser-based image tools — compress, convert, resize, crop, and watermark. No uploads.
Calculate the volume of a box from its length, width, and height in any units.
Parcel length-plus-girth against carrier limits, plus body circumference for fitness.
Convert between profit margin and markup, with fees, shipping, tax, and break-even.
Calculate, split, and visualize subnets. IPv4/IPv6, VLSM, cloud-aware, Terraform export.
Subnet masks, usable host ranges, wildcard masks, and VLSM planning for IPv4 and IPv6.
Strip EXIF, GPS, and hidden metadata from images, PDFs, and Office files, in-browser.
Free, unbiased solar and off-grid calculators — sizing, savings, payback, and batteries.