Developer Tools
String Escape / Unescape
Free online string escape and unescape tool. Escape strings for JSON, JavaScript, HTML, XML, CSV, SQL, unicode \uXXXX, and backslash contexts right in your browser.
Developer Tools
Email Validator
Check whether an email address is well-formed and flag likely typos such as gmial.com — one address or a whole list — entirely inside your browser.
The Email Validator checks whether an address is written correctly and flags likely typos, right in your browser.
Check a single address or paste a whole list. Nothing is uploaded.
How to validate email addresses
- Enter addresses. One to check quickly, or one per line for a list.
- Read the results. Each address is marked valid or invalid with a reason.
- Watch for typos. Well-formed addresses with odd domains get a suggestion.
Format checking versus delivery
Most bad addresses fail because of a simple slip: a missing @, a stray space, or a misspelled domain. Catching those before you send saves bounces and wasted effort.
Real delivery can only be confirmed by emailing the address, so treat this as a fast first filter for a clean list.
- Private: addresses are checked on your device, never uploaded.
- Bulk: validate an entire list in one paste.
- Typo hints: suggestions for misspelled popular domains.
- Clear reasons: each failure explains what is wrong.
Related tools
Validation pairs naturally with gathering addresses in the first place. To pull emails out of a block of text, the Email Extractor collects them into a clean list.
For crafting your own validation patterns, the Regex Tester lets you test expressions live. And to look up the mail servers behind a domain, the DNS Lookup reveals its DNS records.
Frequently Asked Questions
Is my email list uploaded to validate it?
No. Every address is checked in your browser, so your list never leaves your device. Nothing is uploaded, stored, or shared.
Does a valid result mean the address works?
Not necessarily. This checks that the address is written correctly and flags likely typos, but only sending a message proves that a mailbox actually exists.
Can I check many addresses at once?
Yes. Paste one address per line and each is validated separately, with a running count of how many passed and how many failed.
How does typo detection work?
When an address is well-formed but its domain is close to a popular provider, the tool suggests the likely correct spelling, such as "did you mean gmail.com?"
What makes an address invalid here?
Common failures include a missing or duplicated @ symbol, a space in the address, or a malformed domain. The tool names the specific problem it found.
From the same category
Related Tools
Developer Tools
Regex Tester & Explainer
Test and debug regular expressions with live matching, syntax highlighting, pattern explanation, and common regex examples. Supports all JavaScript regex flags
Developer Tools
.htaccess Generator
Generate Apache .htaccess files with HTTPS redirect, WWW handling, custom redirects, error pages, IP blocking, compression, caching, and security features
Developer Tools
Crontab Expression Generator
Generate and test cron expressions with visual interface. Features quick presets, human-readable descriptions, next run times calculator, and crontab entry examples
Developer Tools
SVG to CSS Encoder
Free online SVG to CSS encoder. Convert raw SVG markup into an optimized, URL-encoded data URI for background-image, plus Base64 and HTML img src variants, in your browser.
Developer Tools
URL Parser
Parse and analyze URLs with detailed breakdown of all components including protocol, host, path, query parameters, and hash. Features JSON output and individual component copying
Developer Tools
JSONPath Tester
Free online JSONPath tester to run and debug JSONPath expressions against any JSON document live, with example queries, match count, and pretty results.
Developer Tools
Diff Checker
Compare two texts or code blocks to find differences. Supports character, word, and line-by-line comparison with side-by-side and inline views
Developer Tools
HTTP Status Codes Reference
Free HTTP status codes reference. Search and filter every 1xx-5xx code with a plain-language explanation of what it means and when it is used, right in your browser.
Developer Tools
UUID / GUID Generator
Generate UUIDs (v1, v4) and GUIDs with bulk generation, validation, and parsing. Supports multiple formats including standard, compact, uppercase, braces, and URN
Developer Tools
Credit Card Validator
Check a credit card number with the Luhn algorithm and detect the brand (Visa, Mastercard, Amex, and more). Format check only — 100% client-side, nothing sent to any bank.
Developer Tools
Live Content Previewer Tool
Instantly retrieve a content from remote URL and show it nicely in a Facebook-like layout using the Live Content Previewer tool.
Developer Tools
cURL to Code Converter
Convert cURL commands into code for 15+ programming languages instantly. Perfect for developers who need to translate API requests from cURL format into their preferred programming language.
Developer Tools
Unicode Character Lookup
Free online Unicode character lookup. Inspect any text or code point to see the U+ code point, decimal, UTF-8 bytes, UTF-16 units, HTML entity, and JS escape.
Developer Tools
Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates. Features live current timestamp, batch conversion, timestamp calculator, and multiple format outputs