Web-Tool.net
Simple tools for everyday web life

Useful web tools,
ready when you are.

Small, practical tools you can use directly in your browser. We aim to process your input locally whenever possible.

Tools

Choose a category that fits your task.

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Time

Track activities, elapsed time, and deadlines

Multiple stopwatches

Track several activities at once and save them in this browser.

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Business day & deadline calculator

Calculate dates after or before business days and count date ranges with 2026 Japanese and custom holidays.

Calculate dates

Text & utilities

Create, check, and prepare text

Password generator

Generate a secure random password from your chosen character sets.

Open tool

String length checker

Check characters, UTF-8 bytes, words, and lines in your text.

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Japanese text diff

Compare raw and normalized text locally, including width, kana, whitespace, and line breaks.

Open tool

JSON & CSV workbench

Format and convert data locally, with formula-candidate warnings for CSV.

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Secret and personal data masker

Mask possible keys, tokens, and personal data locally before sharing.

Open tool

Environment & lookup

Inspect your browser and public information

Environment checker

Inspect your browser, screen, language, and time zone information.

Open tool

IP & domain lookup

Inspect public registration data through RDAP for an IP or domain.

Open tool

Money & planning

Review recurring costs and financial choices

Fixed-cost and subscription review

Organize monthly and yearly costs by satisfaction and usage, then review possible savings locally.

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Work & operations

Create and check campaign materials locally

QR code generator and print check

Create URL or text QR codes, export PNG/SVG, and verify the generated image when supported.

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OGP and meta tag checker

Check title, description, Open Graph, Twitter Card, and JSON-LD from a public URL or HTML before sharing.

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robots & sitemap checker

Fetch robots.txt, sitemap.xml, and hreflang HTML from a public URL to check consistency.

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HTML accessibility checker

Review lang, headings, image alt text, and form labels from a public URL or HTML.

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HTTP security headers checker

Check CORS-exposed CSP, HSTS, and Cross-Origin headers from a public URL, or paste the complete set.

Open tool

Public URL publishing gate

Enter one URL to check sharing metadata, crawl files, HTML accessibility, and HTTP headers, then copy a repair report.

Run pre-publish check

URL migration safety gate

Compare an old and new URL for 301, canonical, og:url, hreflang, robots, and sitemap consistency.

Check a migration

Media & display

Play videos and inspect page layouts

YouTube loop player

Create a player that repeats a YouTube video.

Open tool

Multi-view

Display several web pages side by side. Some sites block embedding.

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Image resize & compression

Resize and convert multiple images locally without uploading them.

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Image metadata checker

Check possible EXIF and GPS metadata, then re-output and re-check locally.

Open tool

Result notebook

Save up to five result summaries in this browser. Inputs and secrets are not saved.

Data saved by this site

Shows only the settings, history, and result categories that Web-Tool can see saved in this browser. Categories with no saved data are hidden.

Source text, passwords, and generated secrets are not saved or shown here. This is not a list of all data saved by your browser.

Checking…

This screen checks only Web-Tool localStorage through a fixed allowlist. It does not change cookies, browser history, sessionStorage, or caches.