HeyUtils

HeyUtils is a free collection of browser-based developer utilities: 306 single-purpose tools in 41 categories for formatting, decoding, converting and checking the data developers handle every day. There are no HeyUtils pricing tiers to compare, because every tool is free and works without an account or an install.

It covers the small jobs between larger pieces of work, such as tidying a JSON payload, decoding a JWT, testing a regular expression, building a cron schedule or checking a subnet. Most tools process input with JavaScript in the browser, and the few that need the network, such as DNS lookup or the SSL checker, run only when started and state on the page what they send.

Key features

• Data and formats. JSON formatting, validation and repair, a large-file JSON viewer, and conversion between CSV, JSON, YAML, TOML and XML, plus generators for schemas and types such as JSON to TypeScript.
• Text, encoding and IDs. Regex testing with visible capture groups, Base64 and URL encoding, Unicode inspection, text diff and UUID generation for versions including v4 and v7.
• API and security helpers. A JWT debugger that verifies signatures with explicit keys, an HTTP client, a cURL converter, a webhook tester, hash generators and security header builders.
• Network and email checks. DNS lookup, subnet and CIDR calculators, TLS certificate inspection, and SPF and DMARC builders with an email DNS checker.
• Dev and ops utilities. SQL formatting, Git, Docker, Kubernetes and Helm helpers, CI/CD and cloud helpers, a log viewer, a stack trace formatter and a source map viewer.
• Linked workflows. Suggested chains connect tools for common tasks, for example turning a copied cURL command into a request, decoding its bearer token and reading the JSON response.

Who it is for

Developers, DevOps engineers and IT teams who want quick, bookmarkable utilities for one-off tasks without creating accounts, and who prefer tools that keep pasted data in the browser where possible. The interface is available in English, Russian, Spanish, Brazilian Portuguese, French, German, simplified Chinese, Japanese and Korean.

Pricing at a glance

All tools are free to use, with no account or credit card. The terms say no tool is currently charged for and that any future paid feature would be described before payment is requested. Network tools such as DNS lookup and the SSL checker have rate limits. Checked on the vendor's site on 9 November 2026.

Things to consider

• Network-based tools send the data they need to external services when started, and the webhook tester stores captured requests until its inbox expires, so avoid pasting secrets into them.
• The service is provided as is, and the terms advise verifying important conversion or calculation results independently.
• There are no accounts, so there is no saved workspace or team sharing; a few preferences and saved expressions live in browser storage.
• The site loads a visit analytics script on pages where analytics are enabled, as described in its privacy policy.
• The site does not name the company or person behind it; contact is by email at the address in its terms.

Getting started

Open the HeyUtils tool index, filter by topic or press the search shortcut, and paste input into the tool you need; each tool opens with an example that can be loaded in one click.