なんでも検証。
チェッカー
パスワード、メール、JWT、正規表現などを、一切アップロードせずに検証・確認できます。
21個のツールを利用可能
Affiliate Link Checker
Paste a list of affiliate links and check which are broken.
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PDF Page Counter
Drop in a PDF and instantly see page count, file size, and stats.
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Fake Pay Stub Checker
Spot the red flags of a fake pay stub before renting or lending.
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JWT Decoder
Decode JSON Web Tokens to inspect claims without verifying.
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Regex Tester
Test regular expressions live with match highlighting.
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Cron Expression Parser
Decode cron expressions into human-readable schedules and next runs.
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Color Contrast Checker (WCAG)
Check if two colors meet WCAG accessibility contrast ratios.
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Password Strength Checker
See how long it would actually take to crack a password, in your browser.
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Email Address Validator
Validate email syntax, detect role-based & disposable addresses, locally.
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Keyword Density Checker
See which words and phrases appear most in any text — useful for SEO.
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IBAN Validator
Validate any IBAN for length, format, and mod-97 checksum.
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Credit Card Validator (Luhn)
Check if a card number is well-formed and pass the Luhn check — without sending it anywhere.
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Phone Number Formatter & Validator
Format and sanity-check phone numbers by country.
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Image EXIF / Metadata Viewer
Drop in a photo and see its camera, GPS, and timestamp metadata.
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IPv4 Subnet Calculator
Enter a CIDR and get the network, broadcast, range, and usable hosts.
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Email Subject Line Tester
Score a subject line for length, spam triggers, emoji, and personalization.
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Image Metadata Remover
Export a fresh copy without EXIF and location metadata.
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Image Dimensions Inspector
Inspect pixels, megapixels, aspect ratio, format, and file size.
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JSON Path Finder
Read a nested JSON value using dot and bracket paths.
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MIME Type Lookup
Look up common MIME types by extension or name.
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HTTP Status Code Lookup
Explain HTTP response codes and their usual meaning.
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