DevBolt

Free Developer Tools Online

76+ browser-based utilities for developers. No signup, no tracking cookies, no server uploads. Your data never leaves your browser.

100% FreeZero TrackingClient-Side OnlyNo Signup Required

Why Developers Choose DevBolt

Most online developer tool sites use hundreds of tracking cookies, send your data to remote servers, and bury tools behind signup walls. DevBolt is different. Every tool runs entirely in your browser — nothing is uploaded, nothing is tracked, nothing is stored. You get instant results with complete privacy, every time.

Privacy by Default

Zero tracking cookies. Zero data collection. All processing happens in your browser using the Web Crypto API and standard JavaScript. Your secrets, tokens, and code never leave your device.

Instant Results

No server round-trips, no loading spinners, no waiting. Paste your input and get results immediately. Works offline too — install the PWA for full offline access.

Clean & Focused

No popups, no dark patterns, no clutter. Every tool has a clean interface designed for speed. Keyboard shortcuts (Ctrl+Enter), one-click copy, and responsive design across all devices.

Format Tools(7)

Clean up messy code in one click

Paste unformatted JSON, SQL, XML, YAML, or minified code and get perfectly indented, syntax-validated output instantly.

Convert Tools(19)

Transform data between any format

Base64, hex, binary, CSV, JSON, YAML, TOML, Markdown, TypeScript types — convert between formats without installing anything.

B64
Base64 Codec

Encode and decode Base64 strings with Unicode support

CLR
Color Converter

Convert colors between HEX, RGB, and HSL formats

EP
Epoch Converter

Convert Unix timestamps to dates and back

Aa
Case Converter

Convert text between camelCase, snake_case, kebab-case, and more

0x
Number Base Converter

Convert numbers between binary, octal, decimal, and hex

CSV
CSV ↔ JSON Converter

Convert between CSV and JSON formats with custom delimiters

%20
URL Encoder & Decoder

Encode and decode URLs with encodeURIComponent and encodeURI

YML
JSON ↔ YAML Converter

Convert between JSON and YAML for Kubernetes, Docker, and CI/CD configs

&;
HTML Entity Encoder

Encode and decode HTML entities, special characters, and symbols

IMG
Image to Base64

Convert images to Base64 data URIs or decode Base64 back to images

TS
JSON to TypeScript

Generate TypeScript interfaces and type aliases from JSON data

H↔M
HTML ↔ Markdown

Convert between HTML and Markdown in either direction

CMP
Image Compressor

Compress and resize images with adjustable quality — JPEG, WebP, and PNG

01
Text ↔ Binary Converter

Convert text to binary, hexadecimal, octal, or decimal and decode back with UTF-8 support

/slug
URL Slug Generator

Convert text into clean, URL-friendly slugs with Unicode transliteration and bulk mode

cURL
cURL to Code

Convert cURL commands to JavaScript, Python, Go, PHP, Ruby, and Java code instantly

J→C
JSON to CSV Converter

Convert JSON arrays to CSV with nested object flattening, column selection, and .csv download

TML
TOML ↔ JSON/YAML

Convert between TOML, JSON, and YAML — perfect for Cargo.toml and pyproject.toml

E/D
Encode / Decode Multi-Tool

Base64, Base32, Hex, Binary, URL, and HTML encoding & decoding all in one tool

Generate Tools(28)

Create what you need, fast

UUIDs, passwords, hashes, QR codes, placeholder images, CSS effects, meta tags, config files, and more — generated entirely in your browser.

#
Hash Generator

Generate SHA-1, SHA-256, SHA-384, SHA-512 hashes

ID
UUID Generator

Generate random UUID v4 identifiers in bulk

PW
Password Generator

Generate strong, secure random passwords

Li
Lorem Ipsum Generator

Generate placeholder text for designs and layouts

GRD
CSS Gradient Generator

Create beautiful CSS gradients visually with live preview

QR
QR Code Generator

Generate customizable QR codes from text or URLs

PAL
Color Palette Generator

Generate harmonious color palettes using color theory algorithms

SHD
Box Shadow Generator

Design CSS box shadows visually with multiple layers, presets, and live preview

FLX
Flexbox Generator

Build CSS flexbox layouts visually with live preview, item config, and presets

Grid
Grid Generator

Build CSS grid layouts visually with columns, rows, gap, item placement, and presets

◜◝
Border Radius Generator

Design CSS border-radius visually with per-corner controls, unit selection, and presets

Text Shadow Generator

Design CSS text shadows visually with multiple layers, presets, and live preview

ANI
CSS Animation Generator

Build CSS keyframe animations visually with presets, live preview, and copy-ready code

TBL
Markdown Table Generator

Build Markdown tables visually with an interactive editor, CSV import, and alignment controls

META
Meta Tag Generator

Generate SEO, Open Graph, and Twitter Card meta tags with live Google and social previews

.gi
.gitignore Generator

Generate .gitignore files from 50+ templates — Node.js, Python, Java, Go, Rust, and more

Crontab Generator

Build cron expressions visually — select frequency, time, and days to generate cron schedules

FAV
Favicon Generator

Generate favicons from text or emoji — download PNGs, SVG, Apple Touch Icon, and HTML tags

TW
Tailwind CSS Generator

Build Tailwind CSS utility classes visually with live preview and component presets

PP
Privacy Policy Generator

Generate a customized privacy policy with GDPR, CCPA, cookies, analytics, and payment sections

MCK
JSON Mock Data Generator

Generate realistic fake JSON data for API testing with 30+ field types, preset templates, and schema builder

RDM
README Generator

Generate professional GitHub README.md files with badges, installation steps, usage examples, and more

R.T
robots.txt Generator

Generate robots.txt files with crawl rules for Googlebot, Bingbot, AI bots, and more — presets included

ZOD
Zod Schema Generator

Generate Zod validation schemas from JSON — auto-detects emails, URLs, UUIDs, dates, and nested objects

PH
Placeholder Image Generator

Generate custom placeholder images for wireframes, mockups, and prototyping with custom dimensions and colors

NGX
Nginx Config Generator

Generate nginx configuration files — server blocks, SSL, reverse proxy, gzip, load balancing, and security headers

Aa
ASCII Art Text Generator

Convert text into ASCII art with 7 font styles — banner, block, shadow, slim, star, dot, lines — with comment wrapping for code

R.*
Regex Generator

Generate regex patterns by describing what you need — 60+ curated patterns, visual composer, live tester, and pattern explanations

Inspect Tools(22)

Decode, validate, and debug

JWT tokens, regex patterns, URLs, Dockerfiles, Kubernetes manifests, OpenAPI specs — inspect and validate without leaving your browser.

JWT
JWT Decoder

Decode and inspect JSON Web Tokens instantly

.*
Regex Tester

Test regular expressions with real-time match highlighting

URL
URL Parser

Parse URLs into protocol, host, path, and query params

+-
Diff Checker

Compare two texts and see differences highlighted

CRN
Cron Expression Parser

Parse cron schedules into plain English with next run times

W#
Word & Character Counter

Count words, characters, sentences, and estimate reading time

rwx
Chmod Calculator

Calculate Unix file permissions with an interactive permission matrix

$..
JSON Path Tester

Test JSONPath expressions against JSON data with real-time evaluation

A11
Color Contrast Checker

Check WCAG 2.1 color contrast ratios for AA and AAA accessibility compliance

JSV
JSON Schema Validator

Validate JSON data against JSON Schema (Draft 07) with detailed error reporting and schema generation

IP
IP / CIDR Toolkit

Subnet calculator, VLSM divider, IP range to CIDR converter, and IP address classifier

OG
Open Graph Preview

Preview and debug Open Graph, Twitter Card, and SEO meta tags for social sharing

JS
JS/TS Playground

Run JavaScript and TypeScript code in your browser with instant console output

JSON Diff

Compare two JSON objects and see structural differences — added, removed, and changed keys

DCK
Docker Compose Validator

Validate and format Docker Compose files — check services, networks, volumes, and dependencies

HTTP
HTTP Status Codes

Complete HTTP status code reference — 1xx, 2xx, 3xx, 4xx, 5xx with detailed explanations and use cases

DT
Date Format Tester

Test date format patterns for strftime, date-fns, Moment.js, Go, and Java with live preview and token reference

DKR
Dockerfile Validator

Validate and lint Dockerfiles for syntax errors, security issues, best practices, and layer optimization

K8s
Kubernetes YAML Validator

Validate Kubernetes manifests for syntax, required fields, best practices, security, and resource limits

API
OpenAPI / Swagger Validator

Validate OpenAPI 3.x and Swagger 2.0 specs for structure, paths, schemas, security, and best practices

ENV
.env File Validator

Validate .env files for syntax errors, duplicate keys, security risks, and best practices — export .env.example templates

#F
File Hash Calculator

Compute MD5, SHA-1, SHA-256, SHA-384, SHA-512 file hashes — drag and drop to verify integrity with checksum comparison

Ready to Try?

Pick any tool above and start using it immediately. No signup, no credit card, no time limit. Every tool is free and runs in your browser.

Frequently Asked Questions

Are these developer tools really free?

Yes, every tool on DevBolt is 100% free to use with no signup required. Power users can upgrade to Pro for higher daily limits, API access, and batch processing, but the core tools are free forever.

Is my data safe when using these tools?

Absolutely. Every tool runs entirely in your browser using client-side JavaScript. Your data never leaves your device — nothing is sent to our servers. We use zero tracking cookies and only collect anonymous, cookieless page-view analytics via Vercel Analytics.

Do I need to create an account?

No. All tools work immediately — no accounts, no email verification, no popups. Just open a tool and use it.

Can I use these tools offline?

Yes. DevBolt is a Progressive Web App (PWA). Install it from your browser and use tools offline — all processing happens locally.

What makes DevBolt different from other developer tool sites?

Three things: privacy (100% client-side, zero cookies), speed (no server round-trips, instant results), and focus (clean UI, no clutter, no dark patterns). Most competitor sites use 500+ tracking cookies and send your data to their servers. We don't.

How many tools does DevBolt have?

DevBolt currently offers 76+ free tools across four categories: Format, Convert, Generate, and Inspect. New tools are added regularly based on developer demand and search trends.