7 Browser Tools I Use Every Day as a Developer (Free, No Signup)

ezytoolz (36)in #productivity • 2 days ago

There's a category of tools that doesn't get talked about much in developer circles — not because they're obscure, but because they're almost too simple to write about.
No APIs. No configuration. No stack decisions. Just open a tab, do the thing, close the tab.
I've been building and maintaining a web platform for about a year now, and these seven tools have become part of my actual daily workflow. Not aspirationally bookmarked — actually used. Here's what they are and why I reach for them.

Browser-Based PDF Compression
This comes up more than I expected when I started working on a project that involved user-uploaded documents.
The problem: users were uploading PDFs that were 15–20MB because they'd exported from design tools with maximum quality settings. The upload limit was 5MB. Asking users to "please compress your file first" is a support ticket waiting to happen.
For my own testing and document work, I use a browser-based PDF compressor. Drop the file in, select compression level, download. A 20MB design export typically comes down to under 2MB without visible quality loss at normal viewing sizes.
The part I care about as a developer: the good ones process entirely client-side using pdf-lib or similar — the file never leaves the browser. That matters when you're working with anything that has even minor sensitivity.
Image Format Conversion
WebP support is now solid across browsers, but the real world is messier. Clients still send PNGs that should be JPGs, or JPGs that need to be WebP for a specific use case, or HEIC files from iPhones that need converting before they can be used anywhere.
A browser-based image converter handles this without Photoshop, ImageMagick, or a shell command. For quick one-off conversions during development — converting a placeholder image, testing a different format — it's faster than spinning up a script.
The format options that matter in practice: JPG ↔ PNG ↔ WebP ↔ AVIF. Anything beyond that is usually better handled with a proper image processing pipeline anyway.
Image Compression
Related to conversion but different enough to be its own tool.
When building something with user-generated content, image weight is a constant concern. For testing how compressed images look at different quality levels — without writing code, installing software, or running a build — a browser compressor is useful.
The workflow: upload the original, check the output at 80%, 60%, 40% quality, compare file size vs. visual quality, decide on the compression target for the actual implementation.
It's a faster feedback loop than running sharp or imagemin locally when you're just trying to nail down the right quality threshold.
Meta Tag Checker
This one sounds basic until you're thirty minutes into trying to figure out why a URL isn't sharing correctly on Slack or LinkedIn.
Paste the URL, get back the title tag, meta description, OG tags, Twitter card data, and canonical — all in one view. No browser extension required, works on any machine, works on URLs you can't access locally.
Useful scenarios in actual development:

Checking a staging URL before launch
Verifying OG tags are rendering correctly after a CMS update
Confirming canonical tags are set on paginated content
Debugging why a preview image isn't showing up on social platforms

The one thing I'd note: make sure the tool you use actually fetches the URL server-side rather than just parsing whatever you paste. The former catches dynamically rendered meta tags; the latter doesn't.

JSON Formatter / Validator
Every developer has a JSON formatter. Mine lives in a browser tab.
The use case is simple: copy a raw JSON response from a network request, paste it into the formatter, read it. Or validate a JSON config file that's failing silently. Or compare the structure of two API responses.
Nothing novel here — this tool has existed forever — but it's worth mentioning because it's the one I reach for most consistently. Fast, no install, works on any machine I happen to be on.
QR Code Generator
This one surprised me by being more useful than I expected during development.
The scenario: you're building something that needs to be tested on a mobile device, and you want to share a staging URL without typing it out or using a URL shortener. Generate a QR code, scan it with your phone, done.
Other real uses that come up:

Testing QR code scanning features in an app
Generating a QR for a payment link during testing of a checkout flow
Creating QR codes for internal tools that need to be accessed from multiple devices

A browser-based generator is faster than any other option for one-off QR codes that don't need tracking or analytics.

Diff / Text Comparison Tool
Paste two blocks of text, see the differences highlighted.
This comes up constantly in ways that aren't covered by git diff:

Comparing two versions of a config file that came from different sources
Checking if two API responses are actually identical or subtly different
Comparing error messages across environments to find the one character that's different
Reviewing copy changes before updating a CMS

Most code editors have diff tools, but browser-based ones are useful when you're working across machines, comparing content from external sources, or just want something fast without opening an editor.

A Note on Privacy
For all of these: check whether the tool processes files client-side or server-side before using it with anything sensitive. The better browser tools are explicit about this. If a tool doesn't mention it, assume server-side.
For PDFs and images especially — if the file contains anything you'd care about, client-side processing is worth looking for specifically.

The Common Thread
None of these tools require an account, a download, or a decision about which plan to use. They're not trying to upsell you on anything. They just do one thing in a browser tab.
For tasks that come up daily but don't justify a dedicated tool installation or workflow integration, that's the right level of friction — which is to say, none at all.