DevToolsHub

22+ toolsFree foreverNo signup

Free developer tools that just work

Format JSON, decode JWTs and certificates, compare text, generate hashes, and more—right in your browser.

  • Browser-first
  • No signup
  • Shareable URLs
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Built for real engineering workflows

DevToolsHub is not a thin wrapper around a single library—we curate focused utilities that developers reach for dozens of times a week: formatting payloads before a pull request, decoding a token to confirm claims, comparing two config dumps, or generating a one-off UUID for a migration script. Each page explains the task in plain language, runs as much as possible in your own browser, and lets you share a link when you need someone else to see the exact same input.

Ship with confidence

Validate JSON and XML before it hits CI, inspect certificates and cron expressions before production windows, and keep Markdown drafts readable while your team reviews them in parallel.

Respect for your data

We design tools so sensitive blobs stay local unless a feature clearly needs the network. That model reduces accidental exfiltration and makes the site usable on locked-down corporate laptops where sending proprietary JSON to unknown servers is not an option.

Guides on every page

Below each tool you will find original context on when to use it, pitfalls to avoid, and how it fits next to your editor and terminal—not generic filler, but practical notes we would want if we landed on the page from a search engine at two in the morning.

In-depth developer guides

We publish 22 original long-form articles (and growing) on JSON validation, JWT security, cron and time zones, CSV migration, regex in production, Base64 in APIs, Markdown docs, XML in enterprise systems, accessible color, YAML for Kubernetes, password hygiene, TLS certificates, and safe use of browser-based tools.

Each tool page also includes its own introduction, examples, five-question FAQ, and multiple guide sections—so you never land on a blank utility with only ads.

Read the guides

Explore the toolkit

Three categories—same as the header menu—so you can find what you need fast.

Format & convert

Structure, markup, and data conversion

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JSON Formatter

Validate, prettify, minify, and view JSON in tree format.

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XML Formatter

Validate, prettify, and minify XML. Share via URL. No signup required.

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YAML / JSON

Convert YAML to JSON or JSON to YAML. Copy, download, share via URL.

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CSV / JSON

Convert CSV to JSON or JSON to CSV. Delimiters, headers, shareable URL, download.

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Markdown Preview

Live Markdown editor with rendered and HTML view. Copy HTML, share via URL. GFM supported.

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HTML Entities

Escape and unescape HTML entities; optional full numeric encoding. Shareable URLs.

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Text Diff

Compare two texts. Unified or side-by-side diff. Highlights and shareable URL.

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Lorem Ipsum

Paragraphs, words, sentences, or lists. Custom length, copy, download .txt, share URL.

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Encode & security

Encoding, tokens, keys, and certificates

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Base64 Encode / Decode

Encode text or files to Base64, decode to text or download as file.

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URL Encode / Decode

Percent-encode text for URLs or decode URL-encoded strings. Shareable URL.

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Hash Generator

Generate MD5, SHA-1, and SHA-256 hashes from text. Copy or share via URL.

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JWT Decoder

Decode JWT header and payload to JSON. View exp, iat. Shareable URL.

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PEM / Certificate Decoder

Decode SSL and X.509 PEM certificates. Subject, issuer, validity, SAN, and more.

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Password Generator

Strong random passwords. Length 8–64, character sets, shareable URL.

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UUID Generator

Generate UUID v4 online. Copy one or many, share URL with count.

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Dev utilities

Patterns, time, network, and misc tools

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Regex Tester

Live match highlighting, match list, and line-by-line test strings.

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Color Picker

Pick a color and convert between HEX, RGB, and HSL. Copy values or share via URL.

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Cron Generator

Build cron schedules with presets or custom syntax. Next run times and share via URL.

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QR Code Generator

Create QR codes from text or URLs. Size options, download PNG, share via URL.

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Unix Timestamp

Convert epoch time to date or date to timestamp. Seconds and milliseconds.

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User-Agent Parser

Parse your User-Agent to browser, OS, and device type. Share via URL.

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What is My IP

Check your public IPv4 address instantly. No signup. Copy or share this page.

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Popular free online developer tools

Jump directly to the tools developers search for most—JSON formatting, token decoding, hashes, converters, and more.

Browse by category: Format & convert · Encode & security · Dev utilities

Frequently asked questions

Quick answers about pricing, privacy, and how to use the site.

Are DevToolsHub tools free?
Yes. Every tool is free with no signup or account. Use them as often as you like.
Is my data sent to your servers?
Most tools run in your browser only—your JSON, text, PEM certificates, and similar input stay on your device. Tools that need the network (for example checking your public IP) call external services only for that purpose.
How do I share a result with a link?
Many pages include a Share URL button. It copies a link with your input encoded in query parameters so you or teammates can reopen the same state later.
What tools can I use?
JSON formatter and validator, Base64 encode/decode, regex tester, JWT decoder, MD5/SHA hash generator, CSV↔JSON and YAML↔JSON converters, PEM and SSL certificate decoder, URL encoder, UUID generator, Markdown preview, text diff, color picker, cron builder, XML formatter, password and QR generators, and more—all listed below.
Where is the educational content?
Open any tool and scroll below the workspace—you will find examples, FAQs, and guides. For longer reads, visit our developer guides or editorial standards page describing how we write.
How do cookies and ads work?
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