Web Tools — Free Online Tools
Web utilities that actually get used: DNS lookup for any domain, email validator with SMTP check, URL encoder/decoder, app icon generator, AI resume builder. Free, no signup.
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For the 'why is my site/email not working' days.
A practical guide to web tools on DailyTool
In short: Web utilities that actually get used: DNS lookup for any domain, email validator with SMTP check, URL encoder/decoder, app icon generator, AI resume builder. Free, no signup.
Half the tools here were born from real support tickets. 'Mail not going.' 'Site moved but still shows old server.' 'My URL breaks when there's a space in it.' Each one answers a specific question in under 10 seconds.
DNS Checker queries real records (A, MX, TXT, CNAME...). Email Validator does actual MX + SMTP handshake checks, not just regex. URL tool follows RFC 3986 properly, including emoji. Nothing fancy — just correct.
Who are these web tools for?
Everyday jobs these tools handle well
Site owners after migration
Check if DNS actually propagated or if it's just your cached browser lying to you.
Marketers & founders
Clean an email list before a campaign — one bad list can hurt deliverability for months.
App developers
Generate all 70+ iOS/Android/web icon sizes from one 1024px image.
How to get it right the first time
3 simple steps
For DNS issues, check from the tool — not your browser
Your browser caches DNS for hours. The checker queries fresh, so trust it over refresh-spamming your site.
Validate emails before you send, not after bounces
Paste the list, remove invalid + disposable + catch-all addresses first. 5 minutes here saves a damaged sender score.
Encode only the parameter, not the whole URL
Common bug: encoding the entire https://... breaks it. Encode just the messy value (name, query) and keep ://?&= intact.
Real situations where this helps
Taken from jobs people actually do
Moved host, mail stopped
Run DNS Checker → MX tab. If MX still points to the old host, mail goes there. Fix MX at your DNS panel, wait 30 mins, re-check here.
Signup form rejects valid emails
Test the address in Email Validator. If MX exists but SMTP says catch-all, accept it but flag for review instead of hard-rejecting.
Need app icons by tonight
Upload one 1024x1024 PNG to App Icon Generator → download ZIP with iOS/Android/web folders + manifest. Drop into Xcode/Android Studio directly.
Mistakes people make (so you don't have to)
Quick things worth knowing before you start
Changing DNS 5 times in panic
Each change resets propagation (up to 24-48h). Change once, verify here, then wait. Don't stack changes.
Treating 'valid syntax' as 'deliverable'
name@domain.com can be perfect syntax and still bounce if the domain has no MX. Syntax is not deliverable — check SMTP status.
Uploading a 200px logo for app icons
Icons upscale badly. Start with 1024x1024 minimum, otherwise store listings will look blurry.
All web tools on DailyTool
6 free tools, no signup
- MP3 Converter
Free online audio converter to convert MP3, WAV, MPEG, FLAC, M4A, OGG, AAC. High-quality audio format converter with customizable settings.
- App Icon Generator – Create iOS, Android & Web Icons
Generate all app icon sizes for iOS (iPhone, iPad, App Store), Android (MDPI to XXXHDPI), macOS, watchOS, and web platforms. Upload one image and get 70+ optimized icons with proper folder structure. Perfect for mobile app developers and web designers.
- DNS Lookup & Checker – Query A, MX, CNAME, TXT Records
Perform instant DNS record lookups for any domain. Check A, AAAA, MX, CNAME, TXT, NS, SOA, and more. Diagnose email delivery issues and verify DNS propagation.
- Free Email Validator – Verify Email Addresses Instantly
Instantly check if an email address is valid, deliverable, or disposable. Our advanced tool uses SMTP handshake and MX record lookups to ensure 99% accuracy.
- URL Encode & Decode – Percent Encoding Tool
Fast, browser-based URL encoder and decoder. Convert special characters to percent-encoding (%20, %2F) for safe URL transmission, or decode percent-encoded strings back to readable text.
- AI Resume Builder – Create ATS-Friendly Resumes Instantly
Create a professional, ATS-friendly resume in minutes with AI assistance. Choose from modern templates, customize every section, and export a polished PDF instantly — no design skills needed.
Frequently Asked Questions
Questions people actually ask about web tools