Introducing QA Toolbox: 54 Free Browser Tools for Testers and Developers
Ask a QA engineer to show you their bookmarks and you'll find the same graveyard: one site for formatting JSON, another for decoding JWTs, a third for epoch conversions — each with different ads, different layouts, and a nagging question about where your pasted data actually goes. QA Toolbox exists to replace that pile with a single fast tab.
What's in the box
54 tools across 9 categories, organized the way testing work actually happens:
- JSON Tools — Format, minify, validate, query and convert JSON payloads.
- Text & String — Diff, regex, case conversion, escaping, slugs and word counts.
- Hash & Encoding — Hashes, HMAC, Base64, URL encoding and JWT.
- Screenshots & Media — Annotate screenshots and compress images & video for bug reports.
- Converters — Number bases, cron schedules, color formats, contrast and QR codes.
- ID Generators — UUIDs, random IDs, passwords and realistic test data.
- Date & Time — Timestamps and timezone conversions.
- API QA Tools — Status codes, query builder, cURL and checklists.
- QA Exercises — Practice quizzes and testing scenarios.
Private by architecture, not by promise
The content testers paste into utilities is sensitive by nature: tokens, response bodies with real user data, internal URLs. QA Toolbox has no backend at all — every tool runs client-side in your browser using standard web APIs. Your input can't be logged by a server because there is no server to receive it. That's not a privacy policy; it's the architecture.
Not just for QA
Developers live in the same trenches: pretty-printing a response mid-debug, generating a UUID for a fixture, checking why a cron expression fires at the wrong hour, converting a timestamp from a log. If your day involves APIs, the toolbox earns a pinned tab whether your title says QA or not.
And a place to practice
The exercises category is the part we're most excited about: an API testing quiz, bug report writing practice, test case drafting and find-the-bug scenarios — deliberate practice for the judgment side of QA, not just the tooling side.
It's free, it stays free, and it improves based on what you tell us. If a tool you need is missing, send the idea — the roadmap is literally built from those emails.