30 free browser-based developer utilities: JSON formatter and diff, regex tester, JWT decoder, Base64, hashing, cron parser, YAML and CSV converters. No sign-up, and every tool runs entirely in your browser.
A startup from New York, the United States.
This page is designed to help you find out whether Dev-Toolbox.io is good and if it is the right choice for you.
DevToolbox.io is a collection of 30 developer utilities that run entirely in your browser. Formatters for JSON, HTML, CSS, SQL, XML and JavaScript; comparators for text, files and JSON; converters for YAML, CSV, colour, timestamps and number bases; encoders and decoders for Base64, URLs and JWTs; generators for UUIDs, hashes, passwords, slugs and placeholder text; validators for regex, JSON Schema, JSONPath and cron expressions; and minifiers for HTML, CSS and JavaScript.
Nothing is uploaded. Every tool processes your input locally in the browser, so API keys, tokens, production data and client files never reach a server. The only exception is the Share link button, which uploads the output you choose to share, and that is documented on the privacy page.
There is no account, no rate limit and no paywall. Each tool has its own page with worked examples, a syntax reference and answers to common questions, plus twelve long-form guides covering topics like Unix timestamps, Base64, URL encoding and cron syntax.
Listed in
Runs client-side
Every tool processes input in the browser; nothing is uploaded to a server.
No account required
No sign-up, no login, and no rate limits.
Formatters
JSON, HTML, CSS, SQL, XML and JavaScript, with validation and error locations.
Comparators
Text diff, file diff, and a structural JSON diff that compares by data rather than text.
Converters
JSON to YAML, JSON to CSV, Markdown to HTML, colour, timestamp and number base.
Encoders and decoders
Base64 for text and files, URL encoding, and JWT decoding.
Generators
UUID, hash, password, slug and Lorem Ipsum.
Validators
Regex tester, JSON Schema validator, JSONPath tester and cron expression parser.
Minifiers
HTML, CSS and JavaScript.
Shareable links
Share a result by link; only the output you choose is uploaded.
Everything runs in your browser. Most online developer tools post your input to a server to process it, which makes them unusable for anything sensitive — API keys, access tokens, production records, client data. DevToolbox.io does the work locally, so there is nothing to upload and nothing to retain. The only thing that ever leaves the browser is a Share link you explicitly create.
Three reasons. Privacy: your input never reaches a server, so you can paste a real JWT or a production payload without thinking about it. Breadth: 30 tools in one place, so you are not bouncing between a different single-purpose site for every task. No friction: no account, no rate limits, no ads interrupting the tool, and each tool is its own URL you can bookmark or link to directly.
Working software developers, and anyone adjacent to them — QA engineers, data engineers, technical support staff and students. The common thread is someone who needs to format, convert, decode or compare something quickly, mid-task, and does not want to install anything or hand their data to a third party to do it.
It started from the habit of searching for "json formatter" or "base64 decode" several times a week and landing on whichever ad-heavy site ranked that day, never knowing what happened to the data pasted in. DevToolbox.io was built to be the bookmark that replaces those searches: the same tools, in one place, that run in the browser and do not ask for anything.
Next.js and React with TypeScript, styled with Tailwind CSS and deployed on Vercel. The editors are Monaco, the same editor component used by VS Code. Heavier work — parsing, diffing, formatting and minifying — runs in Web Workers so a large document never freezes the page. Established parsers do the real work rather than hand-written ones: Prettier and Terser for JavaScript, the yaml library for YAML, marked for Markdown and DOMPurify for sanitization.
We have collected here some useful links to help you find out if Dev-Toolbox.io is good.
Check the traffic stats of Dev-Toolbox.io on SimilarWeb. The key metrics to look for are: monthly visits, average visit duration, pages per visit, and traffic by country. Moreoever, check the traffic sources. For example "Direct" traffic is a good sign.
Check the "Domain Rating" of Dev-Toolbox.io on Ahrefs. The domain rating is a measure of the strength of a website's backlink profile on a scale from 0 to 100. It shows the strength of Dev-Toolbox.io's backlink profile compared to the other websites. In most cases a domain rating of 60+ is considered good and 70+ is considered very good.
Check the "Domain Authority" of Dev-Toolbox.io on MOZ. A website's domain authority (DA) is a search engine ranking score that predicts how well a website will rank on search engine result pages (SERPs). It is based on a 100-point logarithmic scale, with higher scores corresponding to a greater likelihood of ranking. This is another useful metric to check if a website is good.
The latest comments about Dev-Toolbox.io on Reddit. This can help you find out how popualr the product is and what people think about it.
Do you know an article comparing Dev-Toolbox.io to other products?
Suggest a link to a post with product alternatives.
Is Dev-Toolbox.io good? This is an informative page that will help you find out. Moreover, you can review and discuss Dev-Toolbox.io here. The primary details have been verified within the last quarter. So they could be considered up to date. If you think we are missing something, please use the means on this page to comment or suggest changes. All reviews and comments are highly encouranged and appreciated as they help everyone in the community to make an informed choice. Please always be kind and objective when evaluating a product and sharing your opinion.
