ToolRivet v0.1.0
v0.1.0 · 22 tools · runs locally

Free developer tools
that run without tracking. in your browser. without a backend. without sign-up. without tracking.

ToolRivet is a focused collection of utilities for developers — JSON formatter, cron parser, JWT decoder, hash generator, regex tester, and more. Every tool runs entirely in your browser. No accounts, no ads, no invasive tracking.

Browse all 22 tools $ try cron-human or press Ctrl+K
~/projects/api · toolrivet live
Handles
JSON YAML JWT SHA-256 CRON OKLCH UUID REGEX BASE64 URL TIMESTAMP DIFF TYPESCRIPT HEX MD5 JSON YAML JWT SHA-256 CRON OKLCH UUID REGEX BASE64 URL TIMESTAMP DIFF TYPESCRIPT HEX MD5

// chap. 01 — by category

Browse developer tools by category.

All categories →
{ }
04 tools

Data & Formats

Format, validate and convert JSON, YAML, TypeScript, and more.
.*
09 tools

Text & Markup

Diff, regex, encoding, Markdown and character utilities.
⏱
03 tools

Time & Scheduling

Cron expressions, Unix timestamps, timezone math.
#
03 tools

Crypto & Auth

Hashes, JWTs, encoders — all computed locally in your browser.
◐
01 tool

Color & Design

HEX, RGB, HSL conversion and color previewing.
⌗
02 tools

IDs & Numbers

UUIDs, ULIDs, base conversion, ID generation.
Popular → json formatter cron expression jwt decoder sha256 regex tester uuid generator yaml to json

// chap. 02 — why ToolRivet

Why developers bookmark this site.

01

Runs locally — your data never leaves the browser

Every utility executes in JavaScript on your machine. Paste a JWT, a password hash, a config blob — nothing is uploaded, stored, or logged.

02

No accounts, no ads, no invasive tracking

There is no sign-up flow, no paywall, and no cookies. We use Umami for anonymous, cookie-free page-view counts — no personal data is collected. You can audit the network tab to confirm.

03

Fast and keyboard-friendly

The site loads in under a second on a cold cache. Press Ctrl+K from anywhere to search every tool. Most flows are paste → result without leaving the keyboard.

04

One job per tool, done well

No bundled feature creep, no "pro" upsell, no hidden modes. The cron parser parses cron. The JWT decoder decodes JWTs. That is the whole product.

// chap. 03 — every tool

Every tool on ToolRivet.

22 utilities · 22 stable
TS JSON to TypeScript → Convert JSON into TypeScript interfaces directly in your browser. Data & Formats stable { } JSON Formatter & Validator → Format, minify and validate JSON directly in your browser. Data & Formats stable ⇄ YAML / JSON Converter → Convert YAML to JSON and JSON to YAML directly in your browser. Data & Formats stable ± JSON Diff → Compare two JSON objects and find structural differences. Data & Formats stable MD Markdown Preview → Preview Markdown instantly in your browser. Text & Markup stable → Markdown to HTML → Convert Markdown to HTML locally in your browser. Text & Markup stable % URL Encoder / Decoder → Encode and decode URL components directly in your browser. Text & Markup stable &; HTML Encoder / Decoder → Encode and decode HTML entities locally in your browser. Text & Markup stable .* Regex Tester → Test JavaScript regular expressions against sample text. Text & Markup stable Δ Text Diff Checker → Compare two text snippets and highlight differences. Text & Markup stable Aa String Case Converter → Convert strings between camelCase, snake_case, kebab-case and more. Text & Markup stable Li Lorem Ipsum Generator → Generate placeholder words, sentences, and paragraphs locally. Text & Markup stable 64 Base64 Encoder / Decoder → Encode text to Base64 or decode Base64 back to text in your browser. Text & Markup stable ⌗ UUID / ULID Generator → Generate UUID v4 and ULID identifiers instantly. IDs & Numbers stable 01 Number Base Converter → Convert numbers between decimal, hexadecimal, binary and octal. IDs & Numbers stable # Hash Generator → Generate SHA-256 and other hashes directly in your browser. Crypto & Auth stable PW Password / Secret Generator → Generate random passwords and secrets locally with Web Crypto. Crypto & Auth stable t Unix Timestamp Converter → Convert Unix timestamps to readable dates and dates back to timestamps. Time & Scheduling stable JW JWT Decoder → Decode JWT header and payload directly in your browser. Crypto & Auth stable * Cron Expression Parser → Parse and validate standard cron expressions. Time & Scheduling stable ⏱ Cron to Human Readable → Convert cron expressions into plain English explanations. Time & Scheduling stable ◐ Color Converter → Convert colors between HEX, RGB and HSL. Color & Design stable

// chap. 05 — FAQ

Frequently asked.

Answers to the questions people search for most when looking for free, private developer utilities. 

/* indexed.txt */
- free for everyone
- no cookies
- input stays local
- public roadmap
01 Are these developer tools free to use? +
Yes. Every tool on ToolRivet is free, requires no account, and has no usage limits. There is no paid tier.
02 Where does my data go when I paste it into a tool? +
Nowhere. Every tool runs entirely in your browser using JavaScript. Your input never leaves your device. There is no backend processing and no logging.
03 Does ToolRivet use cookies or third-party trackers? +
ToolRivet sets zero cookies and loads no ad networks or third-party trackers. We use Umami, a privacy-focused, cookie-free analytics tool, to collect anonymous page-view counts. It stores no personal data and cannot identify you. Your tool input never leaves your browser.
04 Can I use ToolRivet offline? +
Most tool logic is client-side and keeps working after the page has loaded, but ToolRivet is currently shipped as a normal website rather than a full offline PWA.
05 Is it open source? +
The project is maintained publicly and the implementation is designed to be auditable from the repository.
06 How is this different from other online dev-tool sites? +
Most online dev tool sites are ad-laden, slow, gated behind sign-ups, or rebrand premium features. ToolRivet does one thing per tool, runs everything locally, and never asks for an account.
07 Can I request a new tool? +
Yes — open an issue on the repository with a short description and an example input/output. Small, focused utilities that fit the "one job each" rule are usually accepted.
08 Why is the site so minimal? +
Because tools should be invisible. A developer utility you use ten times a day should load fast, do its job, and get out of the way.

// Get started

Bookmark it. Forget about it.
It’ll be there when you need it.

No accounts, no email harvesting, no “unlock premium features.” Just a tab you can keep open and trust.

Browse the bench → $ open cron-human