Ten power utilities for software engineers: format and validate JSON, encode/decode Base64 and URLs, decode JWTs, generate cryptographic hashes and UUIDs, test regular expressions, and minify HTML and CSS — all running securely in your browser.
10 Tools Available
Format, beautify, and syntax-highlight JSON data.
Validate JSON and get precise syntax error locations.
Encode text or files to Base64, and decode back.
Percent-encode URLs and decode them back to plain text.
Decode and inspect JWT header, payload, and expiry.
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes.
Generate UUID v4 in bulk with format options.
Test regex patterns with live match highlighting.
Minify HTML and reduce file size with one click.
Minify and compress CSS for faster page loads.
Guide
Every developer accumulates a personal toolkit of small utilities they reach for constantly — formatting JSON, decoding a Base64 string, generating a quick UUID. PixelTools's Developer Tools category gathers the most frequently needed of these utilities into one place, so you don't have to keep a dozen browser bookmarks scattered across half-trustworthy sites.
These tools are built for the moments in between writing actual code: debugging a malformed API response, preparing data for a commit, or double-checking a regular expression before it ships. Every tool runs client-side, so snippets of code, API keys in transit, or sensitive payloads never leave your browser.
Most of these utilities replace a small, ad-heavy site that used to be the only option for a specific micro-task — decoding one Base64 string, formatting one JSON blob. Having them together in a single, consistent interface means less time hunting for a trustworthy tool and more time on the actual problem.
Few things are more frustrating than staring at a wall of minified JSON trying to find a missing comma. The JSON Formatter instantly beautifies compressed or poorly formatted JSON with proper indentation and syntax highlighting, and flags syntax errors so you can spot the problem immediately rather than scanning line by line. It's equally useful in reverse — minifying readable JSON down to a compact, production-ready string. What used to mean pasting suspicious data into an unfamiliar site, or writing a one-line script just to pretty-print it, now takes a single paste into a tool built for exactly that job.
Encoding and decoding come up constantly when working across systems. The Base64 Encoder/Decoder handles text and file encoding for embedding assets in HTML or CSS, or decoding API tokens and payloads back to readable form. The URL Encoder/Decoder properly escapes special characters for safe use in query strings and reverses the process instantly — both are the kind of two-second lookup that used to mean a trip to an unfamiliar site with no clear privacy policy.
Shipping fast websites means trimming unnecessary bytes wherever possible. The CSS Minifier strips whitespace, comments, and redundant characters from stylesheets, reducing file size and improving load performance — particularly useful for static sites or quick prototypes that don't run through a full build pipeline. For projects that need unique identifiers, the UUID Generator produces RFC 4122-compliant UUIDs in v1 or v4 format, either one at a time for a quick test or in bulk batches for seeding test databases.
Both tools solve the same underlying problem in different ways: a task that's trivial in principle but tedious enough in practice that it's worth having a dedicated, always-available tool rather than writing a throwaway script or digging up an old snippet every time it comes up.
Regular expressions are powerful but notoriously easy to get subtly wrong. The RegEx Tester lets you write a pattern and test it against live sample text, with matches highlighted instantly so you can catch edge cases — an unexpected empty string, a greedy quantifier matching too much — before deploying validation logic to production.
Together, this collection is designed to shorten the loop between "I need to check something quickly" and actually having the answer — without spinning up a local script or trusting an unfamiliar third-party tool with your data.
Spinning up a local script for a one-off task — decoding a single Base64 string, checking one regex pattern — is often more overhead than the task deserves. Browser-based tools fill that gap: no terminal, no dependency installs, no context-switching away from whatever you're already working on. Because everything runs client-side, there's also no risk of a snippet of proprietary code or a partial API response sitting in some third-party server's logs.
Many of these tools also work well together in sequence. Debugging a webhook payload, for instance, often means decoding a Base64-encoded body, formatting the resulting JSON, and double-checking a regex used to validate one of its fields — three tools, one tab, no copy-pasting between unrelated websites with inconsistent interfaces.
None of these utilities aim to replace a proper IDE or build pipeline — they're built for the smaller, faster moments around that work: the quick sanity check before a commit, the one-off conversion while reviewing a pull request, or the regex you want to confirm before it ships inside a validation function. Keeping them fast, free, and free of unnecessary configuration is what makes them worth reaching for instead of writing a throwaway script each time.
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