Web Utility Tools Hub

Collection of 55 fast, free, client-side web utility tools. Use directly in your browser with zero tracking and no account registration required.

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AI INFRASTRUCTURE

LLM Token & GPU Cost Calculator

Compare 2026 multi-model API token pricing, simulate monthly budgets, and size GPU VRAM hardware requirements offline.

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AI INFRASTRUCTURE

Speculative Decoding Simulator

Simulate LLM inference speculative decoding speedup, acceptance rate, and token verification trees offline.

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AI INFRASTRUCTURE

WebGPU Latency Profiler

Benchmark local GPU compute capabilities, WGSL matrix multiplication (GFLOPS), and VRAM transfer bandwidth offline.

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NETWORK SECURITY

eBPF XDP Packet Filter Evaluator

Evaluate eBPF XDP packet filtering decisions (XDP_DROP vs XDP_PASS) and DDoS mitigation line-rate pps offline.

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NETWORK SECURITY

Linux Hardening Config Generator

Generate hardened Linux kernel sysctl.d and OpenSSH sshd_config.d configuration files tailored to workload profiles offline.

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NETWORK SECURITY

WireGuard VPN & Keypair Generator

Generate production WireGuard configs, Curve25519 (X25519) keypairs, and mesh routing parameters 100% offline.

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NETWORK SECURITY

OCI Seccomp Profile Generator

Build zero-trust OCI Seccomp JSON filter profiles and Kubernetes SecurityContext manifests 100% offline.

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NETWORK SECURITY

Systemd Sandboxing Generator

Generate production drop-in security overrides (override.conf) and calculate systemd-analyze exposure scores offline.

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NETWORK SECURITY

PAM & Faillock Policy Generator

Generate production Linux PAM authentication stacks and pam_faillock lockout policies to stop brute-force attacks offline.

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NETWORK SECURITY

Auditd & DFIR Rule Generator

Generate production Linux kernel audit rules (audit.rules), auditd.conf configs, and DFIR ausearch queries offline.

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DEVELOPER UTILITIES

Chmod Calculator

Calculate Linux permissions, 3-digit and 4-digit octal notation (rwx, SUID, SGID, Sticky Bit) offline.

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FINANCIAL UTILITIES

Zakat Calculator

Calculate Zakat Maal and income based on 85g gold nisab and 2.5% rate.

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FINANCIAL UTILITIES

THR Calculator

Pro-rata Holiday Allowance (THR) calculation based on salary and tenure.

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FINANCIAL UTILITIES

Mortgage (KPR) Calculator

Simulate mortgage/vehicle installments, total interest, and tenure.

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FINANCIAL UTILITIES

PPh 21 Tax Calculator

Calculate PPh 21 income tax deductions for gross/net salary with progressive rates.

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FINANCIAL UTILITIES

Split Bill Calculator

Calculate fair split for restaurant bills, service charges, tax, and tips.

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FINANCIAL UTILITIES

Severance Pay Calculator

Estimate statutory severance pay (UP, UPMK, UPH) and contract compensation rights offline.

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FINANCIAL UTILITIES

JHT Provident Fund Estimator

Estimate retirement provident fund accumulations and annual compound returns.

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FINANCIAL UTILITIES

JKP Unemployment Benefit Estimator

Calculate scheduled unemployment insurance cash benefits and wage replacement allowances.

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DEVELOPER UTILITIES

cURL to Code Converter

Convert cURL commands to JavaScript Fetch, Python Requests, Go, Node.js, and PHP.

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DEVELOPER UTILITIES

AI Prompt Token & Cost Estimator

Estimate LLM prompt token counts and API costs across OpenAI, Claude, Gemini, and Llama.

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DEVELOPER UTILITIES

.env to JSON & Secret Redactor

Convert environment variables (.env) to JSON objects or mask secret credentials offline.

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DEVELOPER UTILITIES

SVG Vector to CSS Data URI

Convert raw SVG vector markup into clean CSS background Data URIs and Base64 strings.

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DEVELOPER UTILITIES

Image Format Converter

Convert images between WebP, JPG, and PNG formats directly in your browser without server uploads.

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DEVELOPER UTILITIES

UUID & ULID Bulk Generator

Generate cryptographically secure UUID v4, v1, and sortable ULIDs in bulk offline.

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DEVELOPER UTILITIES

HMAC Signer & Verifier

Generate and verify HMAC-SHA256 and HMAC-SHA512 message signatures offline.

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DEVELOPER UTILITIES

CSV to JSON & SQL Converter

Convert CSV and TSV tabular data into clean JSON arrays or SQL INSERT statements.

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DEVELOPER UTILITIES

IP Subnet & CIDR Calculator

Calculate IPv4 network ranges, subnet masks, broadcast addresses, and usable hosts.

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DEVELOPER UTILITIES

HTML Entity Encoder & Decoder

Encode special characters to safe HTML entities or decode HTML entities back offline.

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DEVELOPER UTILITIES

SQL Query Formatter

Format, clean, and beautify complex SQL queries with custom keyword casing offline.

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DEVELOPER UTILITIES

Hash Generator

Generate SHA-256, SHA-512, SHA-1 cryptographic hashes and verify file checksums offline.

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DEVELOPER UTILITIES

URL Converter & Inspector

Encode, decode, parse query parameters, and strip tracking tags from URLs.

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DEVELOPER UTILITIES

Epoch Timestamp Converter

Convert Unix timestamps (seconds & ms) to human dates (ISO 8601, WIB, UTC) in real-time.

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DEVELOPER UTILITIES

CSS Minifier & Formatter

Compress CSS stylesheet files to save payload bandwidth or format minified CSS.

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DEVELOPER UTILITIES

JSON Formatter & Tree Viewer

Beautify, minify, validate, and inspect JSON structure interactively 100% offline.

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DEVELOPER UTILITIES

JWT Token Decoder

Decode header, claims payload, and check token expiration status safely client-side.

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CRYPTOGRAPHY

Keypair Generator

Generate secure Ed25519, ECDSA P-256, and RSA keypairs offline via native Web Crypto API.

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DEVELOPER UTILITIES

Base64 Converter

Convert text or image files to Base64 strings and decode back 100% offline.

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DEVELOPER UTILITIES

RegEx Live Tester

Test Regular Expression patterns with real-time match highlighting and flags.

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DEVELOPER UTILITIES

Diff Checker

Compare two texts or code blocks side-by-side for line-by-line differences.

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DEVELOPER UTILITIES

i18n JSON Validator

Audit translation key parity, detect missing strings, and catch placeholder mismatches across i18n JSON files.

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DEVELOPER UTILITIES

Cron Expression Generator

Build, inspect, and translate crontab schedule expressions with upcoming execution times.

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TEXT & FORMATTING

Word Counter

Count words, characters, lines, and estimated reading time in real-time.

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TEXT & FORMATTING

Case Converter

Convert text to UPPERCASE, lowercase, camelCase, snake_case, and kebab-case.

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TEXT & FORMATTING

Markdown Previewer

Live browser-based Markdown editor and renderer with zero installation.

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TEXT & FORMATTING

Lorem Ipsum Generator

Generate customizable Lorem Ipsum placeholder dummy text for prototyping.

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TEXT & FORMATTING

Text to Speech (TTS)

Client-side voice synthesizer using native SpeechSynthesis Web API.

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GENERATORS & UTILITIES

QR Code Generator

Instantly generate QR codes from text or URL and download PNG images.

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GENERATORS & UTILITIES

Password Generator

Cryptographically secure random password generator using Web Crypto API.

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GENERATORS & UTILITIES

Color Inspector

Inspect, pick, convert HEX/RGB/HSL, and generate color palettes.

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GENERATORS & UTILITIES

Unit & Currency Converter

Convert length, weight, temperature, and manual currency exchange rates.

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GENERATORS & UTILITIES

Countdown Timer

Customizable event countdown timer with alert sounds and interval tracker.

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GENERATORS & UTILITIES

Random Picker

Fairly pick winners or randomize sequences from a list of names.

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GENERATORS & UTILITIES

Dice & Coin Flip

Interactive custom dice rolling and coin flip (heads/tails) simulator.

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GENERATORS & UTILITIES

Pomodoro Focus Timer

Pomodoro technique focus timer (25m work, 5m break) for time management.

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