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Checkers

Verify, validate, and inspect — passwords, emails, JWTs, regexes, and more — with zero upload.

21 tools available

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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