From JSON formatter to security audits: the best online tools, no signup

JSON formatter and validator

Format, validate, minify, sort keys and generate TypeScript interfaces from JSON. Fully.

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Encoder / Decoder online

Base64, URL, HTML entities, Unicode, JWT decode, images to Data URI. Six tools in one.

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Unix timestamp converter

Epoch <-> ISO 8601 with live multi-timezone and automatic DST. Batch CSV for timestamp lists.

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Hash calculator

MD5, SHA-1, SHA-256, SHA-384, SHA-512 from text or file.

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UUID, ULID, NanoID generator

UUID v4/v7, ULID timestamp-ordered, NanoID, bulk up to 10K, CSV/JSON export. Native crypto-safe.

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Multi-language slug generator

URL-friendly slugs from Italian, Spanish, French, German, English. Proper diacritic handling, batch CSV.

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Color picker and converter

HEX, RGB, HSL, OKLCH, Lab. WCAG AA/AAA contrast checker, palette generator.

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QR code generator

QR codes for URLs, Wi-Fi networks, vCard contacts and SEPA wire transfers in EPC069-12 format with IBAN validation. PNG and SVG export, static payload with no intermediate redirect.

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Lorem ipsum generator

Classic Latin, Italian filler, Cicero original, geek/dev fillers, emoji. Multi-style.

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Text and JSON diff online

Side-by-side text or JSON comparison with the Myers algorithm, unified patch export format.

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Text case converter

UPPERCASE, lowercase, camelCase, snake_case, kebab-case, PascalCase, Title Case with proper accent handling.

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YAML / JSON / TOML converter

Bidirectional YAML, JSON, TOML conversion with strict validation.

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CSV / TSV / JSON converter

CSV or TSV to JSON and back, RFC 4180 compliant parser. Auto-detect delimiter, headers, encoding.

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SQL formatter

Multi-dialect SQL formatter: MySQL, PostgreSQL, SQLite, MS SQL T-SQL, BigQuery, Snowflake, Oracle PL/SQL. Configurable indent, keyword case and minify mode.

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HTML / CSS / JSON / XML minifier

Minify and beautify for HTML, CSS, JSON and XML with inline compression stats. Preserves significant whitespace inside pre, textarea, script and style.

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Regex tester

Regex tester with match highlight, groups, flags (gimsuy). Pattern library categorized (email, URL, IP, phone, dates).

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Cron expression parser

Parse 5-field POSIX cron + aliases (@yearly, @hourly) + weekly visualizer + next 20 runs. Natural language input.

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Glob pattern tester

Test glob patterns (*, **, ?, [abc], {a,b}) against file lists. Sh syntax + minimatch + gitignore.

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JWT decoder

Decode JWT tokens with header and payload split, claim explainer, expiry countdown and optional HS256 signature verification via WebCrypto.

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Mock data generator

Fake data generator (users, emails, addresses, companies) multi-locale (en/it/es/de/fr). Output JSON, CSV, SQL INSERT.

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OG image preview

Preview OpenGraph meta tags for Facebook, X/Twitter, LinkedIn, Discord. Validation of meta tags.

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Markdown <-> HTML converter

Bidirectional Markdown -> HTML and HTML -> Markdown conversion. GitHub Flavored, table support, live preview.

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JSON to TypeScript/Go/PHP

Generate TypeScript interface, Go struct and PHP class from JSON. Nested objects, optional/required inference. Multi-target.

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HTTP status codes reference

Complete HTTP status code reference RFC 9110 (1xx-5xx) + curl example for each + when to use vs when not.

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Image perceptual hash

Compute aHash, dHash and pHash of an image and compare two images with the Hamming distance. All in your browser, no upload.

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QR Code reader

Decode a QR Code from an image or screenshot in your browser. Recognises URL, Wi-Fi, vCard, SEPA and text. No upload, nothing sent.

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Image converter

Convert images between PNG, JPEG, WebP and AVIF and resize them in your browser, with quality and file-size control. No upload.

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PDF metadata

View a PDF's metadata (title, author, software, dates, pages, encryption) right in your browser. No upload, nothing sent to a server.

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HTTP Security Headers Analyzer

Audit HTTP response headers for CSP, HSTS, X-Frame-Options, Permissions-Policy. NIS2 art. 24 + OWASP mapping. Severity-coded findings.

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JWT security audit

Security audit of JWT tokens: alg=none detection, weak HS256 secret brute force, missing claims, oversized lifetime. OWASP-style findings with normative references.

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Apache/Nginx config linter

Security lint for Apache.htaccess or Nginx server blocks. Auto-detects dialect. Findings on weak SSL, exposed status, missing headers.

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Composer audit

Parse composer.json/lock with statistics, EOL detection (Laravel/Symfony/PHPUnit), recommendations. Triage tool, no remote CVE lookup.

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Secure password generator

120 random passwords generated with the unbiased method, ASCII and alphanumeric, click to copy.

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Mojibake steganography

Light Unicode-safe steganography: each byte becomes a random higher codepoint.

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DNS over HTTPS tester

Browser-side DoH queries via Cloudflare 1.1.1.1. Types A, AAAA, MX, TXT, NS, CNAME. No backend, fully.

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Email DNS validator (SPF, DKIM, DMARC)

Parser and validator for SPF, DKIM, DMARC records + MX lookup + multi-resolver compare (Cloudflare, Google, Quad9). For email deliverability audits.

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Encrypt text and files (AES-256)

Encrypt and decrypt text or files with AES-256-GCM and a password, all in your browser. Key via PBKDF2, random salt and IV. No upload.

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Photo EXIF metadata

Extract and read the EXIF metadata of one or more photos (camera, shot, date, GPS) with a forensic SHA-256. Readable values. No upload.

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Currency converter online

Realtime conversion between 30+ currencies (frankfurter.app, ECB rates). 30/90/180-day historical chart inline.

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Adblock test (check your ad blocker)

A privacy-first test that measures, per layer, network/DNS blocking and cosmetic filtering across 50+ real ad networks and trackers. For uBlock Origin, Pi-hole, AdGuard, NextDNS, Brave.

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Sudoku online

Sudoku puzzles with five difficulty levels, guaranteed unique solution.

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