JSON Formatter
Format, minify and validate JSON.
JSON → CSV
Paste an array of objects. Nested keys are flattened (a.b.c).
Base64 Encoder / Decoder
UTF-8 safe text encoding and decoding.
QR Code Generator
Turn any text or URL into a QR code.
Password Generator
Uses your browser's secure random generator.
Image Compressor
Resize and recompress JPG/PNG/WebP locally.
PDF Tools
Merge, extract pages, or rotate. Files never leave your device.
Word → PDF Converter
Convert a .docx file to PDF. Best for text, headings, lists, tables and images; complex layouts may differ.
Timestamp Converter
Unix seconds or milliseconds ↔ human dates.
Regex Tester
JavaScript regular expressions with live highlighting.
Subnet Calculator
Network, broadcast and host ranges for IPv4 and IPv6 subnets, plus every possible network of the chosen size.
IPv4 Subnet Calculator
IPv6 Subnet Calculator
CIDR Calculator
Convert a prefix length to a netmask and wildcard, or a mask back to a prefix.
IP Range → CIDR
Turn a start and end IP address into the smallest list of CIDR blocks that covers it.
IPv4 ↔ IPv6 Tools
Enter an IPv4 address to get its IPv6 forms, or an IPv6 address to expand, compress and identify it.
VLAN Calculator
Check a VLAN ID, and plan how large each VLAN's subnet should be.
Bandwidth Calculator
How long will a transfer take? Remember: speeds are in bits per second, file sizes in bytes.
Last box: real-world efficiency in % (100 = ideal line speed; 85–95 is more typical).
Ping & Latency Tools
Estimate round-trip time, judge a ping result, and see how latency limits throughput.
- Ping / RTT: the time for a packet to reach a server and come back. Lower is better.
- Jitter: how much the RTT varies. High jitter hurts calls and games more than a slightly higher average.
- Packet loss: packets that never arrive. Even 1–2% can slow downloads and break calls.
- Bandwidth vs latency: bandwidth is how much fits per second, latency is how long it takes. A fast link can still feel slow when latency is high.
Browsers cannot send real ICMP pings, so this tool calculates and explains instead.