Base64
Encode and decode UTF-8 text locally in your browser.
Ready. All conversion happens locally.
Input length: 0 · Output length: 0
URL Inspector
Inspect URL structure, encode and decode locally.
Ready. All parsing and conversion happens locally.
Input length: 0 · Output length: 0
HTML Entities
Encode text and decode HTML entities locally in your browser.
Ready. All conversion happens locally.
Hex ↔ Text
Convert UTF-8 text and hexadecimal bytes locally in your browser.
Ready. All conversion happens locally.
Bytes: 0
Data Size & Rate Converter
Convert data sizes and transfer rates without mixing bits and bytes.
Transfer time (optional)
Theoretical transfer time, excluding protocol overhead.
Ready. All calculations happen locally in your browser.
JSON Formatter / Validator
Validate, format and minify JSON locally in your browser.
Enter JSON. All processing happens locally.
Input length: 0 · Output length: 0 · Top-level type: —
JSON ↔ YAML
Convert JSON and YAML locally in your browser.
Ready. All conversion happens locally.
Regex Tester
JavaScript Regex Tester — uses JavaScript RegExp syntax.
Enter a pattern and test text.
Matches: 0
Text preview
Matches and capture groups
Indices use UTF-16 offsets; end is exclusive. Empty matches are shown as │ in the preview.
Text Diff
Compare two blocks of text line by line locally in your browser.
Enter two texts and compare them.
Lines added: 0 · Lines removed: 0 · Lines unchanged: 0
| Old | New | Change | Text |
|---|
UUID Generator
Generate UUID v4 locally using secure browser randomness.
Generate UUIDs. Click any value to copy it.
Generated: 0
Random Password Generator
Generate a secure random password locally in your browser.
Choose your settings and generate a password.
Hash Inspector
Calculate, inspect formats and compare hash values locally.
Ready. Hashing happens locally.
Algorithm: SHA-256 · Input length: 0 · Hash length: 256 bits
HMAC Calculator
Calculate a keyed message authentication code locally.
Hash ≠ HMAC. HMAC uses a secret/key; an empty secret is still an explicit key choice.
Ready. Message and secret stay in your browser.
HMAC
JWT Inspector
Decode claims and optionally verify a signature locally.
Decoded ≠ verified. Valid timing does not verify a signature. A valid signature does not validate claims for your application.
Enter a JWT. All inspection happens locally.
Signature verification: not verified
Token Summary
Claims
Header · JSON
Payload · JSON
Signature
Decoding does not verify a signature.
Signature · Base64URL
Verify signature (optional)
Local only. Keys are not saved. No remote JWKS lookup.
Crypto Material Inspector
Inspect a pasted certificate, CSR or key without external connections.
Paste one PEM block to inspect.
Unix Permissions Calculator
Inspect chmod permissions and calculate the effect of umask.
Ready. No filesystem operations.
s/t includes execute; S/T marks the special bit without execute. Execute also means directory search.
Cron Explorer
Explain Unix cron and preview the next executions.
Ready. Preview only; no jobs are scheduled.
Time Converter
Convert Unix timestamps and date/time across IANA timezones.
Ready. Offline conversion using the runtime timezone database.
Internet Protocol Reference
Look up IP protocol numbers, ICMP messages and DNS record types locally.
Ready. Search the local reference.
HTTP Reference
Find HTTP status codes, methods, headers and media types locally.
Ready. Search the local reference.
DNS Lookup
Inspect DNS records for any domain.
Enter a domain to inspect its DNS records.
DNS Propagation
Compare DNS answers from selected resolvers, queried from this server's location.
Enter a name and choose resolvers to compare their DNS responses.
DNSSEC Inspector
Inspect DNSSEC records and signatures.
Enter a domain to inspect its DNSSEC configuration.
Subdomain Discovery
Discover common subdomains and their DNS records.
Enter a domain to discover its subdomains.
Domain Discovery
Discover known DNS service records and policies configured for a domain.
Enter a domain to discover its known DNS services and policies.
SRV / Service Discovery
Discover services advertised through DNS SRV. DNS only; no connection tests.
Enter a domain or an explicit SRV query name.
Domain Registration
Inspect registration, registrar and domain lifecycle information.
Enter a domain to inspect its registration information.
Domain Security
Review registry-reported locks, delegation and expiry information.
Enter a domain to inspect its security summary information.
Mail Security
Inspect mail DNS policies, keys and TLS configuration. No active SMTP tests.
Enter a domain to inspect its mail security configuration.
Mail Server Inspector
Inspect MX connectivity, SMTP capabilities, TLS certificates and reverse DNS.
Enter a domain to inspect its MX servers. No mail is sent and no authentication is attempted.
IP WHOIS
Inspect public IPv4 and IPv6 registration, network ranges and registry contacts using RDAP.
Enter a single IP address. Special-purpose addresses are classified locally.
CIDR Calculator
Calculate IPv4 and IPv6 network ranges, masks and address capacity. No external lookups.
IPv4 prefix ↔ mask
Enter an IP address with a CIDR prefix.
Subnet Calculator
Split an IPv4 or IPv6 network into smaller subnets by prefix, with a visual overview.
Enter a network and a more specific target prefix.
IP Helpers
Inspect IPv4/IPv6 representations and embedded IPv4 formats. No external lookups.
Enter a single IPv4 or IPv6 address.
Reverse DNS
Look up IPv4/IPv6 PTR records and optionally confirm their forward addresses.
Enter a single IPv4 or IPv6 address.
Network Overlap Checker
Check overlap, containment and shared ranges between IPv4/IPv6 CIDR networks.
Enter at least two CIDR networks.
IP Range ↔ CIDR
Convert IPv4/IPv6 ranges to minimal CIDR sets, or CIDR to address boundaries.
Enter start and end addresses to calculate the minimal CIDR set.
Supernet / Route Summarization
Aggregate IPv4/IPv6 prefixes without adding addresses outside the input networks.
Enter CIDR networks to calculate a minimal lossless prefix list.
ASN Lookup
Identify an autonomous system from an ASN or IP address and inspect registration and observed BGP prefixes.
Enter an ASN or a single IPv4/IPv6 address. Hostnames and CIDR are not accepted.
BGP / AS Path Lookup
Inspect observed AS paths and origins from public RIPE RIS collectors.
Enter an IPv4/IPv6 address or CIDR prefix.
Routing / Prefix Info
Inspect routed IPv4/IPv6 prefixes and origin ASNs observed by RIPE RIS.
Enter an IPv4/IPv6 address or CIDR prefix.
RPKI Validator
Check whether a prefix and origin ASN are authorized by published ROA data.
Enter a CIDR prefix and origin ASN.
Ping
Check public-host ICMP Echo replies, RTT and packet loss.
Enter a public hostname or IP address.
Traceroute
Inspect network hops observed on the way to a public destination.
Enter a public hostname or IP address. Maximum 30 hops.
MTR
Measure per-hop latency and probe response loss.
Enter a public hostname or IP address.
TCP Connect
Test a single public destination TCP handshake.
Enter a public hostname or IP address and one port.
Connection Tester
Connect to one public TCP service and optionally send a short text payload.
Enter a public hostname or IP address and one port.
iperf3
Measure throughput between Toolbox runtime and an external iperf3 server.
Enter a public iperf3 server to run a controlled throughput test.
Path MTU Test
Estimate the unfragmented ICMP packet size to a public destination.
Enter a public destination. Measured from Toolbox runtime.
Latency & Packet Loss
Measure RTT distribution and ICMP loss over a controlled sample run.
Enter a public destination. Measured from Toolbox runtime.
Connection Diagnostic Chain
Find where a web connection stops: DNS → TCP → TLS → HTTP.
Enter a public HTTP/HTTPS URL. Tested from Toolbox runtime.
Port Reference
Find practical operator / DevOps port and service references locally.
Enter a port number or service name. Search runs locally.
Port Scanner
Run a limited TCP connect scan of one public destination.
Enter one public host. Scanned from Toolbox runtime.
Service Detection
Recognize protocol evidence from one public TCP endpoint.
Enter one public endpoint. Tested from Toolbox runtime.
Quick Network Scan
A small profile-based connectivity and service overview of one public host.
Lightweight TCP scan from Toolbox runtime.
TLS Inspector
Snapshot of one verified TLS connection. No HTTP test or version/cipher enumeration.
TLS connection from Toolbox runtime.
TLS Capabilities
Controlled handshake probes for protocol versions and cipher acceptance.
TLS capability tests from Toolbox runtime.
SNI Test
Compare the same TLS endpoint with and without Server Name Indication.
TLS connection from Toolbox runtime.
HTTPS Inspector
A bounded overview of TLS, certificates and HTTPS endpoint behavior.
HTTPS connection from Toolbox runtime.
Certificate Chain & Revocation
Inspect the server-sent chain, local trust and advertised revocation information.
Certificates sent by the server are shown separately from locally trusted CAs.
Certificate Inspector
Inspect leaf certificate identity, validity, trust and cryptography.
Inspect one leaf certificate. Expiry, trust and SAN identity are assessed separately.
HTTP Inspector
Inspect the actual response from a public HTTP or HTTPS endpoint.
HTTP request from Toolbox runtime.
HTTP Security Inspector
Analyze response security headers, cookie flags and observed CORS configuration.
HTTP request from Toolbox runtime.
API Endpoint Tester
Send one controlled request to a public API endpoint.
HTTP request from Toolbox runtime.