Stax vs Smallpdf, JSONLint and TinyPNG: Browser vs Cloud

We have five "alternative to" pages on stax.tools — comparisons against JSONLint, regex101, Smallpdf, TinyPNG, and jwt.io. The reason is simple: a lot of people land on those tools through Google and bounce straight off because they're looking specifically for something else (a daily-limit-free version, a privacy-friendlier version, or just a less ad-heavy interface). Comparison pages are the SEO-friendly way to be findable for those searches.

But this post isn't really about SEO — it's about an honest question we kept getting from early users: when does a browser-only tool actually beat a polished cloud SaaS, and when does it lose?

The honest answer is "it depends on what you're optimizing for." Let me walk through each comparison and where the trade-offs actually lie.

Smallpdf vs Stax PDF Tools

Where Smallpdf wins: PDF-to-Word conversion, OCR on scanned PDFs, e-signature workflows and team features. Smallpdf is a well-established product, and these jobs need server-side or AI infrastructure that does not translate cleanly to the browser.

Where Stax differs: Compress, merge, split, rotate, watermark, page numbers and image-to-PDF run in your browser via pdf-lib and PDF.js, with no account and no daily limit. Smallpdf's support page says free users can process up to 2 conversions a day, and that most of its tools process files on its servers and delete them after an hour (checked 15 October 2026). Check its pricing and privacy pages for the current terms.

The real test: open Chrome DevTools → Network tab and watch the requests while you compress a PDF, first on a cloud service and then on Stax. On Stax you will see page files load and some analytics and advertising requests, but no request carries your PDF. You can verify this in 30 seconds for any tool.

Verdict: Use Smallpdf when you need OCR, PDF↔Word or e-signatures. Use Stax for the core operations when you want the file to stay on your device. Full comparison →

JSONLint vs Stax JSON Formatter

This comparison needs care, because the facts are less clear-cut. JSONLint's homepage does not say whether validation runs in the browser or on a server; it points to an open-source npm package, @jsonlint/core, and does not document a hosted API. JSONFormatter.org says its validation happens in the browser and that JSON saved without logging in becomes public.

Where JSONLint wins: name recognition, and the npm package if you want to validate JSON inside your own code.

Where Stax differs: a formatter, tree viewer and converters (JSON to CSV, YAML, TOML and TypeScript) in one place, everything in your browser, and nothing is saved. If you are choosing a data format for a new project rather than just validating one, our JSON vs XML vs YAML guide breaks down the trade-offs.

Verdict: Whichever tool you use for production data, run the Network tab test rather than trusting any tool's description, ours included. Full comparison →

TinyPNG vs Stax Image Compressor

TinyPNG is a cloud service, and a good one. Its homepage says free users can upload up to 20 images at once, each up to 5 MB, that uploads are kept for a maximum of 48 hours and then deleted, and that it offers a developer API and AVIF output.

Where TinyPNG wins: its own compression, which may produce smaller PNG files, batch uploads of up to 20 images, AVIF, and an API for build pipelines. If you are optimising hero images where every kilobyte matters, try it.

Where Stax differs: no upload, no usage limit, and an exact target size in KB for JPEG and WebP. It compresses one image at a time with your browser's own encoder, and shrinks a PNG by reducing its dimensions or converting it, so for flat graphics TinyPNG may save noticeably more. WebP output is covered in our conversion guide.

Verdict: TinyPNG for batches and maximum PNG savings. Stax for day-to-day "compress my screenshot for Slack" or "get this photo under 200 KB" when you would rather not upload it. Full comparison →

regex101 vs Stax Regex Tester

This is actually a tough one. regex101 is the gold standard. Token-by-token explanation, a quick-reference panel, a debugger, code generation, save-and-share via URL, and many engines (PCRE2, Python, Go, Java, .NET, Rust and more in addition to JS), all on its Free plan with Pro adding extras. Its documentation says matching runs locally in your browser and test strings are not uploaded unless you save, share or use the API. It's genuinely the best tool for learning regex.

Stax is positioned for working, not learning: a quick JavaScript test, copy the pattern, paste it into your code, with nothing to sign in to or save. It does far less than regex101 and only tests JavaScript regex. It's wired into our Regex Cheat Sheet for syntax lookup as a separate page.

Verdict: regex101 for learning, other engines, debugging and sharing. Stax for a rapid JavaScript check. Use both — they complement each other. Full comparison →

jwt.io vs Stax JWT Decoder

jwt.io is the best-known JWT debugger. Its homepage offers a decoder, an encoder and signature verification, and it does not say where decoding happens, so check its privacy notice and the Network tab before pasting a live token. Stax decodes the header and payload in your browser. For a primer on what is inside a token, see our JWT decoder guide.

Where jwt.io wins: signature verification with secret entry, and an encoder for building tokens.

Where Stax differs: it decodes only (no verification, no encoder), but sits next to the Base64 encoder, hash generator and regex tester, which helps when you are bouncing between them while debugging an auth problem.

Verdict: Use jwt.io if you need to verify a signature or build a token; for production verification use a backend library. Use Stax when you just want to read a token's claims alongside other developer tools. Full comparison →

The pattern across these comparisons

Three things tend to differ between browser-only tools and cloud services:

1. Free plans on cloud services usually have limits; browser tools have no per-use server cost. Cloud free tiers are paid for by paid tiers. A browser tool does the work on your device, so there is no server bill to ration.

2. Privacy is verifiable in 30 seconds. Open DevTools → Network → use the tool. If your data appears in a POST body, the tool is not client-side. This works for any tool, ours or anyone else's, and it is more reliable than any description of what a tool does.

3. OCR, summarisation and other AI features still need backends. They need GPUs and language models, which we cannot ship as pure browser tools yet. For deterministic operations (compression, formatting, encoding, decoding, hashing), browser-only is usually the better fit.

The future probably is not "everything goes back to the browser" or "everything moves to the cloud": deterministic operations stay client-side, AI operations live in the cloud with consent-driven uploads, and the line keeps moving as WebAssembly and on-device models make more things possible locally.

For now, when you have a choice and the data is sensitive, pick the browser-only tool. When you need AI or specialised algorithms, pick the cloud service, but check its privacy policy and retention period before pasting production data.

Two more comparisons worth knowing

iLovePDF vs Stax PDF Suite

iLovePDF is a popular cloud PDF service with many tools, including conversions and OCR. Its pricing page lists per-task limits on the free plan (file size and number of files per task), and its terms say files are processed on its servers and deleted within two hours (checked 15 October 2026). For the core operations Stax handles (compress, merge, split, rotate, watermark, page numbers, image-to-PDF, PDF info), a client-side approach is directly competitive.

Where iLovePDF wins: more operations in total, including PDF to Word, PowerPoint and Excel and OCR on scanned PDFs (check its site for the current list). If you regularly need operations beyond the core set, its breadth is hard to match.

Where Stax wins: no upload for the core operations, no account, and no server-imposed size limit (your browser's memory is the limit). For confidential PDFs such as NDA agreements, tax documents or bank statements, keeping the file on your device is the point.

See the iLovePDF alternative comparison for the full breakdown.

Canva vs Stax Design Utilities

Canva is a design platform; Stax is a utility toolkit. There is limited direct competition, but where they overlap (social media image sizing, color tools, QR codes) the comparison is instructive.

Canva's advantage: templated design, brand kits, collaboration, many export formats and AI image generation. These are platform-level capabilities that Stax does not attempt.

Stax's advantage: when you just need to resize an image to a specific pixel size without signing in to a design account, or check a color contrast ratio without opening a full design tool, a dedicated utility is quicker. The Image Resizer does it in a few seconds in one page.

The right model is complementary: use Canva for design work and Stax for quick utility tasks. The Canva alternative page covers the quick-design side in more detail, and if you are comparing Stax with other all-in-one utility sites, see the TinyWow alternative comparison.

Choosing the right tool for sensitive data

The 30-second verification test applies to every tool, not just the ones we've compared:

1. Open DevTools (F12) → Network tab → clear the log
2. Perform your operation (compress, format, convert, decode)
3. Filter for Fetch / XHR requests
4. If you see a POST request containing your file or data content: the tool is not client-side
5. If you see no request that carries your file or data (page files and small analytics counts are normal): the tool is processing locally

This test works on stax.tools, on JSONLint, on jwt.io, and on any tool claiming to be client-side. Run it on any tool handling data you're not comfortable uploading — it takes 30 seconds and provides certainty that no marketing copy can.

The pattern, in short

Three things consistently differentiate browser-only tools from cloud SaaS in 2026:

1. Daily limits exist for SaaS tools, not browser tools. Free tiers on cloud SaaS are subsidized by paid tiers — there's a marginal cost per task. Browser tools have zero marginal cost per use.

2. Privacy is verifiable in 30 seconds. Open DevTools → Network → use the tool. If your data appears in a POST body, the tool isn't client-side. Run this test before trusting any tool with sensitive data.

3. AI features still require backends. OCR, summarization, semantic search — these need GPUs and language models. For pure deterministic operations (compression, formatting, encoding, decoding, hashing), browser-only is usually the better fit.

For now: when you have a choice and the data is sensitive, pick the browser-only tool. When you need AI or specialized algorithms, pick the cloud SaaS — but verify their privacy policy before pasting production data.

— Want a tool we don't have yet? Email hello@stax.tools. We keep a list.