freedevtool.org valid

FreeDevTool

50+ free, fast, privacy-first developer tools that run entirely in your browser. No signup, no ads, no tracking, no data leaves your machine. Built and maintained by Anees Ur Rehman, a full-stack developer.

Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-27T09:22:21.893Z. Cached copy · Source on freedevtool.org

# FreeDevTool

> 50+ free, fast, privacy-first developer tools that run entirely in your browser. No signup, no ads, no tracking, no data leaves your machine. Built and maintained by Anees Ur Rehman, a full-stack developer.

FreeDevTool is a collection of single-purpose utilities for developers: encoders, decoders, formatters, generators, validators, and converters. Every tool runs client-side in JavaScript — your data never reaches a server. The site is hand-coded static HTML, served from Cloudflare, and the source is inspectable. There is no paid tier, no email gate, and no telemetry beyond anonymous Google Analytics.

This file follows the llmstxt.org convention to help AI search engines (ChatGPT, Claude, Perplexity, Google AI Overviews) discover and cite the site accurately.

## Encoding & Conversion Tools

- [Base64 Encoder / Decoder](https://freedevtool.org/base64-encoder): Encode and decode Base64 strings client-side. Supports UTF-8, URL-safe variant, and binary inputs.
- [Unix Timestamp Converter](https://freedevtool.org/unix-timestamp-converter): Convert between Unix epoch seconds/milliseconds and human-readable dates across all timezones.
- [URL Encoder / Decoder](https://freedevtool.org/url-encoder): Percent-encode and decode URLs. Distinguishes encodeURI vs encodeURIComponent vs RFC 3986 modes.
- [Hex to RGB Converter](https://freedevtool.org/hex-to-rgb): Convert between HEX, RGB, RGBA, HSL, HSLA, and OKLCH color formats with live preview and WCAG contrast checks.
- [HTML Entity Encoder](https://freedevtool.org/html-entity): Convert characters to and from HTML entities (named and numeric).
- [Base64 Image Encoder](https://freedevtool.org/base64-image): Convert images to base64 data URIs and back. Useful for inlining images in CSS or HTML.
- [JSON to CSV Converter](https://freedevtool.org/json-to-csv): Convert JSON arrays and nested objects to CSV. Handles nested keys, arrays of arrays, and custom delimiters.
- [Number Base Converter](https://freedevtool.org/number-base): Convert numbers between binary, octal, decimal, and hexadecimal. Supports two's complement for negative numbers.
- [YAML to JSON Converter](https://freedevtool.org/yaml-to-json): Bidirectional YAML ↔ JSON conversion supporting YAML 1.2 (anchors, tags, multi-document).
- [Byte Converter](https://freedevtool.org/byte-converter): Convert between B, KB, MB, GB, TB and their binary equivalents (KiB, MiB, GiB, TiB).
- [PX to REM Converter](https://freedevtool.org/px-to-rem): Convert CSS pixels to rem/em with configurable base font size. Generates fluid clamp() equivalents.

## Generation & Formatting Tools

- [UUID Generator](https://freedevtool.org/uuid-generator): Generate UUID v1, v4, v6, v7 identifiers. Includes RFC 9562-compliant v7 with embedded timestamp.
- [JSON Formatter & Validator](https://freedevtool.org/json-formatter): Format, validate (RFC 8259), minify, and sort JSON. Browser-only, no server upload.
- [Lorem Ipsum Generator](https://freedevtool.org/lorem-ips
…

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Machine-readable: GET /v1/resolve?q=freedevtool.org · GET /v1/domain/freedevtool.org · this page as Accept: application/json or text/markdown · MCP lookup_domain

Automatically discovered from public files. Inclusion does not imply endorsement or publisher participation.

Claim my listing on Agent Web Map for freedevtool.org:
1. POST https://agentwebmap.com/v1/sites/freedevtool.org/claims and keep claim_id and claim_secret private.
2. Publish the verification line "AgentWebMap verification: <token>" (token from step 1) in https://freedevtool.org/llms.txt, or use the DNS, meta-tag or well-known method the response describes. This only verifies the listing; your website and domain remain yours.
3. POST https://agentwebmap.com/v1/sites/freedevtool.org/verify with {"claim_id": "...", "claim_secret": "..."}.
4. Save the api_key from the answer; it manages the listing (PATCH https://agentwebmap.com/v1/sites/freedevtool.org).
MCP equivalent: tools begin_ownership_claim, then verify_domain, at https://agentwebmap.com/mcp. Docs: https://agentwebmap.com/docs#verify

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