// Developer tools, version 1.0

Developer tools that just work.

Fast, private, browser-based utilities for converting, formatting, validating, encoding, and transforming developer data.

Explore tools YAML → JSON

Processed in your browser43 live toolsNo accounts required

// Popular tools

Start with what developers reach for most.

Browse all

YAML to JSONConvert YAML to JSON in your browser with line-aware errors.yaml JSON FormatterPretty-print JSON with customisable indentation.formatters JWT DecoderDecode header, payload, and signature of JSON Web Tokens.security Cron GeneratorBuild cron expressions with a friendly form.generators Base64 ConverterEncode and decode Base64 strings and files.encoders URL Encoder / DecoderPercent-encode and decode URL components.encoders Markdown to HTMLRender Markdown to sanitised HTML.web

// Browse by category

Find tools by what they do.

YAML

Validate, format, and convert YAML.

4 tools

Converters

Move between data formats.

13 tools

Formatters

Pretty-print and minify code.

6 tools

Validators

Check syntax and structure.

2 tools

Encoders

Encode data for transit or storage.

2 tools

Generators

Create identifiers, schedules, and test data.

5 tools

Web

HTML, URL, and markdown utilities.

2 tools

Security

Inspect tokens and hashes.

2 tools

// Privacy

Everything happens in your browser.

DevSpeedTools runs entirely client-side. The YAML you paste, the JWT you decode, the Base64 you encode — none of it is sent to a server for processing. No accounts, no analytics on your input, no logs of what you typed.

Read the privacy policy

No tracking of inputNo signup requiredOpen source mindset

// FAQ

Frequently asked questions.

Is my input sent to a server?

No. Every tool runs entirely in your browser. Open the network tab — you won't see any request carrying your data.

Are these tools free?

Yes. DevSpeedTools is free to use. We may show lightweight, non-intrusive advertisements on some pages to help fund the project.

Do you support large files?

Yes, but processing happens on the main thread. For very large files the UI may briefly pause while converting — that's why every editor has a clear button and a download link.

Can I use DevSpeedTools offline?

Once a page is loaded, the in-page tool continues to work without a network connection. There is no service worker yet, but the editor itself has no network dependencies.

Which tool should I start with?

Most developers start with YAML → JSON, JSON Formatter, or JWT Decoder.