YOONADEV TOOLS
From development to everyday tasks, ready-to-use tools
Check servers, mail, and networks. Create QR codes and edit images and videos. Get things done without installing anything.
SMTPResponse example
550 5.1.1 User unknownDIAGNOSISRecipient account not found
Check the recipient address for typos.
EVERYDAY TOOLS
See what you can make
Pick a tool and make it your own.
Photo & Video Editing
No matching tools. Try the task or output you need.
Image Tools
2.4 MBMail Workbench
Read mail errors, inspect messages, and find what to check next.
Diagnostics
- SMTP StatusSMTP reply code or error messageSuccess, temporary or permanent failure and next checks
- SMTP Error DictionaryError code or wording from a bounceError meaning and checks by likely cause
- Mail DNS Command BuilderDomain and record type such as MX or TXTDNS lookup commands
- OpenSSL BuilderMail server, port and TLS connection modeOpenSSL commands to inspect certificates and TLS
- Mail Packet CaptureInterface, host and port to capturetcpdump filters and capture commands
SMTP
Headers & MIME
- Mail Header AnalyzerComplete headers of a received emailReceived hops, sender fields and recorded authentication
- MIME InspectorRaw email including headers, blank line and bodyMIME tree and body / attachment part details
- MIME GeneratorSender, recipient, subject, body and attachmentsAn .eml file and raw MIME text
Authentication
IMAP
POP3
Encoding & Conversion
- Encoding InspectorGarbled or encoded source textRepresentation, charset candidates and readable text
- Encode / DecodeText or Base64, Hex or URL-encoded dataText converted to the selected format
- MIME Encoded-WordA mail subject, display name or encoded-wordA readable subject or MIME encoded-word
- Transfer EncodingMIME part body, charset and transfer encodingDecoded body or transfer-encoded text
- UTF-7An IMAP mailbox namePlain-name / Modified UTF-7 conversion
Linux Workbench
Find commands for files, logs, processes, and daily server work.
Troubleshooting
Processes & Resources
Files & Search
Permissions & Ownership
Logs
Archives
SSH & File Transfer
Schedules
VI/Vim
Certificate Workbench
Inspect certificates, expiry dates, and key matches.
- Certificate InspectorA PEM certificateValidity, domains, issuer and key details
- Certificate Chain InspectorA chain of PEM certificatesCertificate relationships and chain checks
- CSR InspectorA PEM certificate signing requestRequested domains, subject and public key
- PEM InspectorPEM text to identifyBlock types, count and readable structure
- Certificate ↔ Key MatcherA certificate or CSR and a private keyMatch or mismatch based on public keys
- CSR BuilderDomains, subject and key typeA new CSR and its matching private-key file
HTTP Workbench
Understand request headers, URLs, and HTTP responses.
Infrastructure Workbench
Prepare commands for Docker, Redis, and Kafka operations.
Docker
Redis
Kafka
Data
Format, compare, and convert the data in front of you.
- SQL FormatterSQL query and database dialectFormatted or compact SQL
- JSON InspectorJSON text to inspectSyntax error location or formatted JSON
- JWT Analyzer & GeneratorA JWT token or claims to generateDecoded header and payload or a generated token
- JSON ↔ YAMLJSON or YAML configurationConfiguration converted to the other format
- JSON ↔ CSVA JSON array of flat objects or CSVCSV table data or a JSON array
- Unix Timestamp ConverterUnix number or date/time and timezoneUnix seconds / milliseconds and date/time
- Text DiffBefore and after textAdded, removed and changed lines
- UUID Generator & ValidatorGeneration count or a UUID to inspectNew UUIDs or format and version checks
- Hash GeneratorText and SHA algorithmA digest for the selected algorithm
Network
Work out IP ranges and subnet settings without manual arithmetic.