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Client-Side vs Server-Side Tools

“Runs in your browser” is often used as shorthand for privacy, but what does it actually mean? Here’s how to tell if your data ever leaves the device and what trade-offs to expect.

Table of contents

    Client-Side Tools

    These run entirely in your browser (JavaScript/WebAssembly). Input never leaves your computer. Perfect for text utilities: Base64, JSON formatter, hash generator, UUIDs, URL encode/decode, timestamps, regex tester, diff, word counter, dummy text.

    Pros: instant, private, offline-friendly.

    Cons: limited by browser resources for huge files.

    Server-Side Tools

    Some tasks require libraries not available in the browser or heavy processing. In these cases, files are uploaded, processed temporarily, then discarded. Examples: image optimizer, PDF merge/split/compress, CSV ↔ JSON converter.

    We keep uploads only temporarily, then delete them.

    How to Recognize Each

    1. Client-side: no page reload, instant results, no file uploads.
    2. Server-side: handles large files, shows a progress bar, returns a download.

    Conclusion: Use client-side for privacy and speed, server-side for heavy file processing. Visit our tools

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