Online utilities

44 tools

This collection brings together tools now organized into more specific categories. Browse it or explore the new categories.

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Sviluppo web e SEO

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What is my IP?

See the public IP address this website receives and whether it uses IPv4 or IPv6. Copy your IP and refresh it after changing your network or VPN.

JWT decoder

Read a JWT’s JSON header and payload locally without sending the token elsewhere.

Color contrast checker for WCAG

Compare foreground and background colors. Calculate their contrast ratio and check WCAG AA and AAA thresholds for normal and large text.

XML formatter and syntax checker

Make XML easier to read with consistent indentation and find syntax errors. Copy the formatted result or download it as a file.

JSON formatter

Format or minify JSON while preserving numbers and duplicate keys. Browser processing: 1 million input characters, 100 nesting levels, 4 million output characters.

JSON validator

Validate JSON syntax and locate errors by line and column. Does not validate JSON Schema and allows duplicate keys. Up to 1 million characters and 100 levels.

Base64 converter

Encode and decode UTF-8 text with standard Base64 or Base64url. Text up to 200,000 characters; Base64 strings up to 1 million. Binary files not supported.

Regex tester

Test JavaScript regex with groups and indices. Isolated worker, 1 second limit, 100,000 text characters, 1,000 results and 500,000 captured characters. Not PCRE.

IPv4 and IPv6 subnet calculator

Find the network, address range, subnet mask and address count from an IP address and CIDR prefix. Includes IPv4 point-to-point networks and IPv6.

Binary translator and number converter

Convert decimal numbers to binary and back, or translate UTF-8 text into binary bytes. Copy or download the result in your browser.

HTML entity encoder and decoder

Encode HTML characters and decode numeric and named references. Results remain text and never execute HTML.

HTML formatter and beautifier

Indent HTML fragments while preserving attributes, text and pre, script and style blocks. Copy the code and review whitespace.

JSON compare: structural diff

Compare two JSON documents independently of object key order. Find additions, removals and changes using JSON Pointer paths.

Google SERP simulator

Preview a Google-style snippet using your title, URL and meta description. Compare mobile and desktop and estimate title width.

HTTP redirect checker

Check a URL’s HTTP redirects, status codes and final destination. Follow each step in the redirect chain and identify loops or unexpected hops.

SSL certificate checker

Check a domain’s SSL certificate, expiry date, issuer and covered hostnames. Review the validity and details of the website’s TLS certificate.

SPF, DKIM and DMARC checker

Check your domain’s SPF, DKIM and DMARC DNS records. Enter a DKIM selector to review email authentication syntax, configuration and policies.

Online SQL formatter

Format SQL queries with readable indentation. Choose a supported SQL dialect, copy the formatted result and organize code without running queries.

CSS and JavaScript minifier

Minify CSS or JavaScript code, compare the original and output sizes, and copy the result. Select your language and reduce the size of your code.

Chmod permissions calculator

Convert Linux file permissions between numeric and symbolic notation. Set read, write and execute permissions for the owner, group and others.

DNS lookup: check a domain’s DNS records

Look up a domain’s A, AAAA, MX, TXT, NS, CNAME and CAA records. Inspect responses and errors without treating one resolver as a global propagation test.

WHOIS lookup: public domain data with RDAP

Look up a domain’s published registrar, dates, status and nameservers with RDAP. Redacted or unavailable registration fields remain clearly identified.

Security headers check: inspect HTTP responses

Inspect a page’s CSP, HSTS and other HTTP response headers. Read actual values and contextual explanations; this check does not certify website security.

Broken link checker: find links and source pages

Crawl your site with HTML and JavaScript to find broken links and missing resources. Review source pages and redirects, then download the CSV report.

Open Graph checker and social preview

Check a page’s Open Graph title, description, URL and image. See an illustrative sharing preview and identify missing or duplicate metadata.

Robots.txt tester: check URLs and user agents

Test robots.txt rules for a URL and user agent. See the matching allow or disallow rule; crawl permission alone does not guarantee search indexing.

Date e tempo

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Online stopwatch

Measure time with pause, resume and lap times.

Online timer

Online countdown timer with pause, resume and an optional sound.

Days between dates

Calculate calendar days between two dates, with an inclusive end-date option.

Working days and holidays

Count working days with Italian or custom holidays and optional working Saturdays.

Add hours and minutes

Add and subtract durations in hours and minutes, with decimal-hour totals.

Work hours and breaks

Calculate worked hours from intervals, overnight shifts and additional breaks.

Countdown to a date

Choose an event date, time and time zone. Watch the days, hours, minutes and seconds remaining update in a live countdown.

Pomodoro timer for study and work

Alternate focus and breaks with custom durations, cycle counts, pause and resume. The timer runs in your browser.

File e produttività

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Personal Kanban board with calendar

Organize tasks across personal Kanban boards and a calendar. Drag cards to change status or due dates, save online, and access your boards on desktop or mobile.

Free with a verified account