Free online checkers

29 checkers that run entirely in your browser — free, no signup, no tracking. Part of the Validation & Stats group.

• Word CounterThis word counter tool provides counts for words, characters, sentences, lines, and paragraphs. Paste your text to get instant statistics.
• Character CounterCharacter Counter — free online tool. Both totals are shown because the rules differ: some platforms count spaces, others do not. Works on mobile and offline.
• Regex TesterRegex Tester — free online tool. The pattern is compiled by the browser’s own engine, so the result matches what JavaScript will do in your code. Works on mobile and offline.
• GPA CalculatorGPA Calculator — free online tool. Credit-weighting is where self-calculations go wrong: an A in a 4-credit course pulls twice as hard as an A in a 2-credit lab. Works on mobile and offline.
• Word Counter for EssaysWord Counter for Essays — free online tool. Counts update as you type. Works on mobile and offline.
• Email ValidatorEmail Validator — free online tool. Fast, private, no signup. Works on mobile and offline.
• Cron Expression BuilderCron Expression Builder — free online tool. The five-field order is the part everyone mixes up — minutes first, weekdays last. Works on mobile and offline.
• Instagram Font GeneratorInstagram Font Generator — free online tool. Fast, private, no signup. Works on mobile and offline.
• Hashtag CounterHashtag Counter — free online tool. Both totals are shown because the rules differ: some platforms count spaces, others do not. Works on mobile and offline.
• Keyword Density Checker ProThe Keyword Density Checker Pro analyzes text to show the percentage of a specific word or phrase. Use it to refine your writing.
• SGPA CalculatorSGPA Calculator — free online tool. Credit-weighting is where self-calculations go wrong: an A in a 4-credit course pulls twice as hard as an A in a 2-credit lab. Works on mobile and offline.
• Character Counter with SpacesCharacter Counter with Spaces — free online tool. Both totals are shown because the rules differ: some platforms count spaces, others do not. Works on mobile and offline.
• Bulk Email ValidatorBulk Email Validator — free online tool. Fast, private, no signup. Works on mobile and offline.
• Regex Tester OnlineRegex Tester Online — free online tool. The pattern is compiled by the browser’s own engine, so the result matches what JavaScript will do in your code. Works on mobile and offline.
• Crontab GeneratorCrontab Generator — free online tool. The five-field order is the part everyone mixes up — minutes first, weekdays last. Works on mobile and offline.
• HEX to HSL ConverterHEX to HSL Converter — free online tool. Fast, private, no signup. Works on mobile and offline.
• Twitter Character Limit CheckerTwitter Character Limit Checker — free online tool. Both totals are shown because the rules differ: some platforms count spaces, others do not. Works on mobile and offline.
• SERP Snippet Length CheckerEnsure your SERP snippets display correctly. Check character lengths for meta titles, descriptions, and URLs to avoid truncation on Google.
• Phone Number ValidatorPhone Number Validator — free online tool. Fast, private, no signup. Works on mobile and offline.
• Character Counter without SpacesCharacter Counter without Spaces — free online tool. Both totals are shown because the rules differ: some platforms count spaces, others do not. Works on mobile and offline.
• Regex Match ExtractorUse this tool to extract all occurrences that match your regular expression from any text. Specify your pattern and flags.
• Paragraph CounterParagraph Counter — free online tool. Fast, private, no signup. Works on mobile and offline.
• Domain Name CheckerDomain Name Checker — free online tool. Fast, private, no signup. Works on mobile and offline.
• Word Frequency CounterWord Frequency Counter — free online tool. Writers use the top-10 list to catch their own crutches — the same adverb appearing twenty times. Works on mobile and offline.
• Twitter Character CounterTwitter Character Counter — free online tool. Both totals are shown because the rules differ: some platforms count spaces, others do not. Works on mobile and offline.
• IPv4 ValidatorIPv4 Validator — free online tool. Fast, private, no signup. Works on mobile and offline.
• URL Regex TesterURL Regex Tester — free online tool. The pattern is compiled by the browser’s own engine, so the result matches what JavaScript will do in your code. Works on mobile and offline.
• UUID ValidatorUUID Validator — free online tool. Fast, private, no signup. Works on mobile and offline.
• SQL Date Format ConverterSQL Date Format Converter — free online tool. 31/01/2026 and 01/31/2026 are the same day written in two conventions — and 03/04/2026 is ambiguous everywhere. Works on mobile and offline.