String length checker
Check characters, UTF-8 bytes, words, and lines.
Check lengthFind the right tool
Choose a tool
for your task.
Prepare text, compare money choices, process files locally, or check a public page before sharing. These categories link directly to the existing Web-Tool.net tools.
Tools by task
Read the short description, then open the tool you need.
Text & utilities
Prepare input and data for the next step
Japanese text diff
Compare text after width, whitespace, and line-break normalization.
Compare textPassword generator
Generate a random password from the character sets and length you choose.
Generate passwordJSON & CSV workbench
Format and convert data locally, with formula-candidate warnings for CSV.
Process dataSecret and personal data masker
Mask possible keys, tokens, and personal data locally before sharing.
Mask dataMoney & planning
Review recurring costs and financial choices
Fixed-cost review
Review monthly and yearly costs by satisfaction and usage, locally.
Review costsFurusato tax estimate
Estimate a donation limit and safer target from salary and dependents.
Estimate limitMoney & asset tools
The broader finance hub is Japanese-first and includes interest, assets, tax, and housing comparisons.
Open finance hubEnvironment & lookup
Inspect your browser and public information
Environment checker
Inspect your browser, screen, language, and time zone.
Inspect environmentIP & domain lookup
Inspect public registration data through RDAP.
Look up informationTime & media
Track activities and make media easier to view
Multiple stopwatches
Track several activities at once and save them in this browser.
Track timeYouTube loop player
Create a player that repeats a YouTube video.
Loop a videoMulti-view
Display several web pages side by side; some sites block embedding.
Open multi-viewFiles & images
Process files in the browser without uploading them
Image resize & compression
Resize and convert images locally, then compare dimensions and size.
Process imagesImage metadata checker
Check possible EXIF and GPS metadata, then re-check the output locally.
Check metadataQR code generator
Create URL or text QR codes and verify the generated image.
Create a QR codeWork & pre-publish checks
Check the real public state before sharing a URL
OGP & meta tag checker
Check title, description, Open Graph, Twitter Card, and JSON-LD from a public URL or HTML.
Check sharing metadatarobots & sitemap checker
Fetch robots.txt, sitemap.xml, and hreflang HTML from a public URL.
Check crawl filesHTML accessibility checker
Review lang, headings, image alt text, and form labels from a public URL or HTML.
Check accessibilityHTTP security headers checker
Check exposed CSP, HSTS, and Cross-Origin headers from a public URL.
Check headersPublic URL publishing gate
Enter one URL to run four bounded pre-publish checks and copy a repair report.
Run pre-publish checkURL migration safety gate
Compare an old and new URL for 301, canonical, og:url, hreflang, robots, and sitemap consistency.
Check a migrationWhich mode does a tool use?
Image, JSON, and masking tools process input in this browser. OGP, robots, accessibility, and security-header checks fetch a public URL so they can inspect the delivered page. Some calculators remain Japanese-first; those links intentionally stay on their canonical Japanese page.