Tools for Developers

Capital Gains Tax FR

Free online Capital Gains Tax FR — fast, private browser tool on Fneno.com.

CIDR IP Range Calculator

Expand CIDR to network, broadcast, host count

network→

Course Schema Generator

Course / learning JSON-LD

Cron Expression Explainer

Human-readable explanation of cron schedules

Cron Expression Generator

Build and validate cron schedules with a visual editor

Cron Next Runs

Preview next scheduled cron executions

Cron Timezone Converter

Cron UTC ↔ your timezone

CSV ↔ JSON Converter

Convert CSV tables to JSON and back

CSV to JSON Converter

Parse CSV rows into JSON array

CSV to Markdown Table

Convert CSV rows to MD tables

Digital Skills Quiz & Certificate

Digital literacy quiz — 2FA, cloud, browsers, backups — with level certificate

Digital Tasbih Counter

Count dhikr with a simple digital tasbih

arabic→

Discount Calculator

Find sale price after percent or fixed discount

calculator→

Docker Compose Generator

Starter docker-compose.yml

Event Schema Generator

Event structured data markup

Fake Data / Mock Generator

JSON mock users and products for tests

Fapiao A4 Two Per Page

Free online Fapiao A4 Two Per Page — fast, private browser tool on Fneno.com.

Fapiao Batch Renamer

Free online Fapiao Batch Renamer — fast, private browser tool on Fneno.com.

Fapiao Duplicate Checker

Free online Fapiao Duplicate Checker — fast, private browser tool on Fneno.com.

Fapiao Folder Organizer

Free online Fapiao Folder Organizer — fast, private browser tool on Fneno.com.

Fapiao OFD To PDF Converter

Free online Fapiao OFD To PDF Converter — fast, private browser tool on Fneno.com.

Fapiao PDF Merger A4

Free online Fapiao PDF Merger A4 — fast, private browser tool on Fneno.com.

Fapiao PDF To OFD Converter

Free online Fapiao PDF To OFD Converter — fast, private browser tool on Fneno.com.

Fapiao Stamp Adder

Free online Fapiao Stamp Adder — fast, private browser tool on Fneno.com.

Fapiao To Excel Extractor

Free online Fapiao To Excel Extractor — fast, private browser tool on Fneno.com.

Fapiao XML Parser

Free online Fapiao XML Parser — fast, private browser tool on Fneno.com.

FAQ Schema Generator

Build FAQPage JSON-LD for rich results

Git Commit Message Generator

Conventional Commits format builder

GitHub README Generator

README.md with badges & sections

HMAC SHA-256 Generator

Generate HMAC signatures for webhooks and APIs

HowTo Schema Generator

HowTo structured data with steps & supplies

HTTP Request Builder

Send GET/POST requests with headers and body

network→

INI to JSON Converter

Parse INI config files to JSON

JSON Formatter Chinese Ui

Free online JSON Formatter Chinese Ui — fast, private browser tool on Fneno.com.

JSON to CSV Converter

Convert JSON array of objects to CSV

JSON to TypeScript

Generate TS interfaces from JSON

JSONPath Extractor

Query JSON with path expressions

JWKS JSON Validator

Validate JWK Set JSON for OIDC providers

JWT Generator (HS256)

Create signed JWT tokens with your secret

Markdown Table Generator

Build aligned Markdown tables visually

Markdown to HTML Converter

Convert Markdown to clean HTML instantly

Markdown to HTML Converter

Convert Markdown to clean HTML

Markdown to PDF

Render Markdown notes as PDF

Markdown To Wechat Html

Free online Markdown To Wechat Html — fast, private browser tool on Fneno.com.

Offer Price Schema

Product Offer / price JSON-LD

OpenAPI Stub Generator

Build OpenAPI 3 YAML stubs for REST APIs

Organization Schema

Organization JSON-LD for knowledge panel

PDF to Markdown

Extract PDF text as structured Markdown

Product Schema Generator

Product JSON-LD for rich results

PWA Manifest Generator

Progressive Web App manifest.json builder

QAPage Schema Generator

FAQ rich results QAPage JSON-LD

Recipe Schema Generator

Recipe rich results JSON-LD

Regex Pattern Library

Common regex patterns with live test

RMB Capital Amount Converter

Free online RMB Capital Amount Converter — fast, private browser tool on Fneno.com.

Schema.org JSON-LD Generator

Create FAQ, Product, Organization structured data

Secure Password Hash (PBKDF2)

PBKDF2-SHA256 hash for dev testing

security→

Software Application Schema

App / SaaS JSON-LD markup

SRI Hash Generator

Subresource Integrity sha256/sha384 hashes

Subnet Calculator

Calculate CIDR, netmask, and host ranges

TOML to JSON Converter

Convert TOML config to JSON

Train Ticket Fapiao Parser

Free online Train Ticket Fapiao Parser — fast, private browser tool on Fneno.com.

URL Slug Generator

Create SEO-friendly URL slugs from any title

UUID Generator

Generate RFC-compliant UUID v4 identifiers instantly

Video Schema Generator

VideoObject JSON-LD for YouTube embeds

XML Formatter

Format, validate, and minify XML documents

XML Sitemap Generator

Create XML sitemaps for better search indexing

YAML ↔ JSON Converter

Convert between YAML and JSON both ways

🔥

JSON Formatter

Format, validate and beautify JSON instantly

New✦ AI

AI Hashtag Generator

Generate trending hashtags for Instagram, TikTok and X

ai→

New

Find & Replace Tool

Find and replace text online — supports regex

Base64 Encoder / Decoder

Encode and decode Base64 strings instantly

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-512 hashes

JWT Decoder

Decode and inspect JWT tokens instantly

Markdown Editor

Write Markdown with live preview and export

Regex Tester

Test regular expressions with live match highlighting