Local processing when the tool allows it
Many utilities run on your device. Some need our API to return a result. The details are in the privacy policy.
In-browser compute, with clear exceptions
PDFs, images, editors, password generation, and JWT inspection run in your browser or Web Workers. Formatters and validators may send pasted text to our API transiently to return a result. We do not keep those submissions as a user account.
⚡ WebAssembly & Web Crypto API
We leverage native W3C cryptographic primitives (crypto.getRandomValues) and WebAssembly-optimized modules to ensure real cryptographic entropy and instantaneous execution speed with zero network latency.
Privacy without certifications we do not have
We do not build a database of what you paste. That is not HIPAA compliance and it is not an ISO 27001 certification. If you must not transmit a secret, use in-browser tools and do not paste production data into formatters that call the API.
Specialized Utilities Engineered for Developers & Creators
A comprehensive suite organized into eight technical domains to streamline day-to-day engineering workflows.
JSON tools
Five pages on utilsbox.biz: pretty-print, validate the error line, minify, convert to XML, and compare two documents.
Cryptography & Tokens
CSPRNG secure entropy generation, JSON Web Token (RFC 7519) inspection, UUID v4/v7 (RFC 9562) generation, and Base64 / Hex encoding suites.
Text & Natural Language
Levenshtein distance algorithms, visual unified diff comparison, reading speed metrics, lexicographic word counting, and casing transformations.
SEO & Webmaster Diagnostics
OpenGraph & Twitter Card previews, Schema.org JSON-LD structured data generators, robots.txt analyzers, XML sitemaps, and DNS propagation lookups.
Document & PDF Manipulation
Lossless visual compression, multi-file merging, page extraction, format conversion for e-readers (Kindle), and client-side document processing.
Design, Palettes & Colorimetry
Mathematical color space conversions (HEX, RGB, HSL, CMYK), WCAG 2.1 AA/AAA contrast auditing, SVG vector optimization, and 2D QR matrix generation.
Chronometry, Timestamps & Dates
Bidirectional UNIX epoch conversion to ISO 8601/RFC 3339, banking business day calculators, timezone difference matrices, and Cron syntax parsing.
Applied Mathematics & Calculators
Percentages, loans, mortgages, VAT, BMI, and calories, with the formula shown on each calculator.
Built on Ground-Truth Specifications by IETF, W3C & ISO
Strict syntax and typing for structured data interchange and interoperability across modern REST APIs.
Claim validation, JOSE headers, and compact cryptographic signatures for web authentication.
Global identifiers with pure v4 entropy and chronological timestamp-ordered v7 sequences.
Canonical specification for Base64, Base32, and Base16 data encodings for safe binary transport.
Universal format for unambiguous time point representation, durations, and global UTC offsets.
Color contrast ratios, keyboard accessibility, and semantic ergonomics for inclusive software tools.
Everything You Need to Know About Utilsbox
❓ Does everything run in the browser?
No. PDFs, images, several editors, passwords, and JWT do. Formatters and validators may send text to our API to return a result. See Privacy for details. Do not paste production secrets into those tools.
❓ Is the password and key generator cryptographically secure?
Yes. Instead of using predictable Math.random(), we strictly use window.crypto.getRandomValues, an operating-system-backed Cryptographically Secure Pseudorandom Number Generator (CSPRNG).
❓ Is Utilsbox HIPAA or ISO 27001 compliant?
No. We are not a HIPAA covered entity and we are not ISO 27001 certified. Claiming otherwise would be misleading.
❓ Why is the platform 100% free with no registration required?
We believe fundamental developer utilities should remain frictionless and open without requiring sign-up barriers, paywalls, or marketing email collection. The project is sustained through clean, non-intrusive display ads.