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ToolsSonic’s claim that pasted data stays in the browser can be checked against observable network activity: open a tool, watch the browser’s Network panel, and enter data. That check can help you see whether new requests appear after you interact with a page, but it is not an independent security audit or proof about every tool and every browser-side storage behavior.
What ToolsSonic says happens to your data
ToolsSonic describes itself as a browser-based suite of 104 utilities, including tools for JSON, JWTs, hashing, regular expressions, Markdown, CSV, HTML, and text. Its current homepage groups its tools into developer, AI, and text workspaces. The site says processing runs on the visitor’s CPU and that user input is not sent to an application backend. The homepage’s reader-facing answer to “Where does my data go?” is that processing happens in the tab.
In his article, senior software engineer and architect Suudipta Mukherjjee describes the site as static HTML, CSS, and JavaScript delivered as files, without an application backend that processes submitted content. He says the tools do not use fetch, XMLHttpRequest, navigator.sendBeacon, WebSockets, or form submissions to transmit user content. These are the author’s descriptions of the implementation, not findings from an independent audit.
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Open the specific ToolsSonic utility you want to use.
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Open your browser’s developer tools and select the Network panel. Clear the existing request list so page-load activity is not confused with activity that follows your input.
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Use the tool: type, paste, or drop representative content into it.
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Watch the Network panel for new requests after you enter or change the content. The homepage recommends this manual check; Mukherjjee summarizes it as: “Open any tool, open the Network tab, paste something, and watch nothing happen.”
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A lack of new requests after input is useful evidence about what you observed in that browser session. It does not establish that every tool has been reviewed, that no other form of data handling exists, or that the deployed code has passed a security assessment. The Network panel is a way to inspect visible browser requests, not a complete security guarantee.
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What the on-page request counter can—and cannot—show
Mukherjjee says ToolsSonic includes a live request counter that reads resource entries from the browser Performance API. According to his description, it records a baseline when a user first types and watches for subsequent changes. The counter is intended to make network activity easier to notice without requiring users to interpret a full request log.
That mechanism is an observability aid, not proof by itself. It depends on what the page measures, and the article’s description does not establish that the counter independently validates every request or every tool. For a closer look, use the browser’s own Network panel on the particular utility you plan to use.
Local processing still involves network activity and browser storage
Static files are fetched
“Your data stays in the page” does not mean the site makes no network requests. The homepage says pages and tools fetch static files, such as the assets needed to load them. That is distinct from transmitting the content you enter for remote processing. A page-load request can therefore appear even if the tool handles your input locally.
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LocalStorage disclosure differs from the article’s description
The article describes session history as in-memory and says the tools do not write user content to localStorage. The current homepage, however, says the browser’s localStorage may retain remembered data under keys beginning with ts-, which users can inspect, export, or delete. The available descriptions do not explain whether they refer to different versions, different kinds of data, or a changed implementation. Check the current site’s storage behavior rather than assuming the two statements mean the same thing.
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Offline use is mostly after loading
The homepage says offline use is “mostly” available once a tool has loaded. A tool you have not visited still needs its initial file fetch, so local processing should not be confused with guaranteed offline availability from the first visit.
Why the author highlights JSON and JWT handling
Preserving JSON values
Mukherjjee says a straightforward JSON.parse/JSON.stringify round trip can alter large numeric values, turn an overflowing number into null, or discard a duplicate object key. He says ToolsSonic’s JSON utilities tokenize input into an abstract syntax tree (AST), preserve original scalar text, and re-emit it; duplicate keys are retained and counted for a warning. The article describes the implementation as 109 lines, dependency-free, and MIT-licensed as json-safe. Those implementation details are the author’s claims, not independently verified findings.
Decoding a JWT is not verifying its signature
A JSON Web Token can be decoded without establishing that its signature is valid. The article says ToolsSonic’s JWT utility performs verification locally with the browser’s crypto.subtle API. It lists HS256/384/512, RS256/384/512, and ES256/384/512 as supported, and says unsupported algorithms return an explicit unsupported result rather than being reported as a pass or fail. Mukherjjee says the module is 81 lines, tested against tokens signed with node:crypto, and MIT-licensed as crypto-kit; the tests were not reproduced independently.
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The article says the HTML preview uses a sandboxed iframe, with allowing scripts as an opt-in. It also says pasted or dropped images are embedded as data URLs with FileReader and subject to a size guard. These are descriptions of the implementation in the article, not a substitute for checking the behavior of the live tool with content appropriate for your risk level.
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How to judge the claim for your own use
Use the Network panel check as one part of a practical decision, not as a universal certification. Consider the specific content and function you need, what requests you observe after entering data, what the site says may persist in localStorage, and whether the tool handles your edge cases. The homepage’s comparison with upload-based alternatives is vendor-authored; it should not be treated as an independent evaluation.
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For routine, non-sensitive formatting, a local-processing design may reduce the need to send input to a processing server.
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For secrets, credentials, private keys, or regulated data, a browser check alone may not meet your security requirements. Follow your organization’s policy and use a vetted workflow.
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If you need offline access, load the exact tool beforehand and verify it works in the conditions you expect; the homepage does not promise that unvisited tools work offline.
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Sources and attribution
Suudipta Mukherjjee’s article, “I built 104 developer tools that never send your data anywhere — and made it provable, not promised”, reported September 16, 2026, contains the author’s implementation descriptions and the quoted verification prompt.
ToolsSonic’s homepage describes its current local-processing claim, static-file loading, Network panel check, localStorage disclosure, and qualified offline availability.
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