PWA Checklist
Progressive Web App checklist covering manifest, service worker, HTTPS, performance, accessibility, and caching strategies.
How it works
- 1Configure your options above
- 2Click "Generate" — processing happens in your browser
- 3Copy or download the result
What to do next
About PWA Checklist
PWA Checklist is built for developer utility jobs that fit cleanly into a browser tab. Progressive Web App checklist covering manifest, service worker, HTTPS, performance, accessibility, and caching strategies. The processing runs in the page itself, which is why the controls update instantly when you change settings and why a freshly loaded page is ready to do real work the moment it becomes interactive.
Typical users of PWA Checklist include frontend developers prepping fixtures, devops engineers crafting one-liners and data analysts wrangling JSON. The thread connecting all of them is the same: a focused developer utility task that fits cleanly into a browser tab and benefits from a tool with sensible defaults and minimal setup.
PWA Checklist parses your file with standard browser APIs entirely inside the browser, applies the options you selected, and returns a download. The processing has no network step, which means a slow or intermittent connection does not slow down the work — once the page is loaded, only your CPU and RAM are involved.
Architecturally, PWA Checklist is a single-page client. The processing layer is standard browser APIs; the UI is a thin React shell on top. Inputs flow through the engine and the output is returned to the browser as a Blob you can save or copy. The 0 MB cap is the only hard limit and it exists to keep memory usage stable on every device.
Reach for PWA Checklist when you need a predictable result on a single file. The page works on the first visit, the controls are visible without a menu, and the output is delivered the moment the engine finishes.
For multi-step jobs, PWA Checklist sits next to Page Load Time Calculator, Sitemap XML Generator, and HTTP Status Code Reference. None of them depend on each other — you can use PWA Checklist on its own — but together they cover the common variations of the task this page exists to handle.
The download is delivered as a clearly named file the moment processing completes — no email link, no "your result will be ready in 5 minutes" queue, no expiry timer. The file is generated in your browser and saved by your browser's normal download flow.
On limits: 0 MB per file is the ceiling. Output formats and quality settings are listed in the controls panel above, and they apply to every run.
PWA Checklist keeps the control set focused. Every option on the page is there because a real workflow needs it, and the defaults aim at the most common case so a first-time user can get the right output without changing any settings.
Some background on the design choices behind PWA Checklist: every option you see on the page is there because a real workflow needs it, and every option that is not shown has been deliberately omitted to keep the common case fast. The bias is toward minimal-but-complete.
Useful patterns when working with PWA Checklist: keep the input file open in another tab so you can compare against the result; give the output file a descriptive name when saving so you can find it later (the default name is sensible but generic); and treat each run as independent — the tool has no concept of "history", which means you cannot accidentally pollute one job with leftovers from another.
If the result is not what you expected, the most common causes are easy to check. Confirm the input is under the 0 MB ceiling — files just above the cap fail silently because the engine refuses to allocate the buffer. Confirm the input is one of the supported formats. And if the page itself feels slow, try closing other heavy tabs to free up memory; the engine runs in your browser, so it competes for the same resources as everything else open.
If you also use a command-line tool for pwa checklist, PWA Checklist is a convenient alternative for the times you are on a different machine or helping someone who is not comfortable in a terminal. The output is a standard file in the format documented above.
Open the workspace above to start using PWA Checklist. The engine loads on the first interaction so the page itself stays light, and once the tool is warm it processes subsequent jobs quickly. The moment the page is interactive, the tool is ready to do real work on your file.
How it works
- 1Reach the PWA Checklist page in your browser to begin.
- 2Select the developer file you want to process — drag-and-drop and the file picker both work.
- 3Pick any non-default settings you need. Most users leave the defaults alone for the first run and only revisit if the result needs tuning.
- 4Hit the run button. standard browser APIs does the work in your browser tab.
- 5Grab the output as soon as the run completes. You can also copy the result instead of downloading if the next tool in your workflow accepts pasted input.
- 6Re-run with different settings as often as you want. Each run produces a fresh output and the original file on disk is never modified.
Common use cases
- Inspect a regex against a test string before committing it using PWA Checklist.
- Decode a token to confirm its claims during a debugging session.
- Hash a string for a quick reproducibility check.
- Convert between data formats while wiring up an integration.
- Generate boilerplate from a single specification line.
- Encode binary content for transport in a JSON body.
- Pretty-print a minified blob during incident triage.
- Validate a config blob before pushing to staging.
FAQ
What is a PWA?
A Progressive Web App is a website that uses modern web capabilities to deliver an app-like experience — installable, works offline, and fast.
Basic vs full checklist?
Basic covers the minimum (manifest, service worker, HTTPS, responsive). Full adds performance, engagement, caching, accessibility, and SEO.
Do I need a service worker?
Yes — a service worker is required for offline support, push notifications, and the "Add to Home Screen" prompt.
Icon requirements?
At minimum, a 192×192 and 512×512 PNG icon in the manifest. Apple devices also need apple-touch-icon.
Is HTTPS required?
Yes — service workers only work on HTTPS (except localhost for development). This is a security requirement.
Private?
Yes — checklist generated locally.
How do I run PWA Checklist over a folder of files?
PWA Checklist processes one input at a time by design — it keeps memory usage predictable on lower-end devices and makes results easier to verify. To handle a folder, run the tool once per file; the page stays loaded between runs and remembers your last-used settings, so the second run is essentially instant.
Which browsers are supported by PWA Checklist?
PWA Checklist works in any modern browser released in the last few years — Chrome, Edge, Firefox, Safari, Brave, Arc and the major Chromium derivatives are all supported. The underlying engine relies on widely-supported web APIs, so there is nothing exotic to install. If you are on a very old browser version and the tool fails to load, updating to the latest release of your preferred browser is the only fix needed.
Can I trust the output of PWA Checklist for important work?
PWA Checklist is built on standard browser APIs, which is the same class of engine used by professional developer utility pipelines. For deterministic operations, the output is byte-identical to what an equivalent CLI run would produce; for operations involving a codec or a model, the result is well within the range of what comparable tools generate. If you have a specific reference output you need to match, run a small test job first to confirm the configuration produces what you expect.
What should I do if PWA Checklist fails on my file?
Failures usually fall into one of three buckets: the input is in an unsupported format, the input is over the size cap, or the input is structurally malformed (a truncated download, a partial export, or a stream the engine does not recognise). The first two are easy to confirm — check that your file is in a supported format and that it is below 0 MB. For the third, opening the file in its native viewer first is the fastest way to confirm the source is intact.
Is PWA Checklist licensed for business use?
PWA Checklist can be used for personal and commercial work alike — there is no separate "business" licence to purchase. The output you generate is yours to use however you want, including in client deliverables, internal documents, or commercial products. Favtoo's only ask is fair, individual use; the tool is not designed to be embedded as a backend service or wrapped behind an API for resale.
What input formats are supported by PWA Checklist?
The accepted formats are listed in the upload area on the tool itself. If your input is in a format that is not directly supported, convert it first using one of Favtoo's converter tools — every Favtoo converter outputs a file that is a clean input to the next tool in the chain.
How long does Favtoo retain my data after using PWA Checklist?
Favtoo keeps no copy of your file because Favtoo never receives your file. PWA Checklist runs entirely in your browser, the input is held only in your tab's memory, and closing the tab discards it. There is no opt-in cloud history, no "recent jobs" panel synced to an account, and no server-side retention to configure — the architecture simply has nowhere for your file to be stored.
Can I self-host PWA Checklist for my team?
PWA Checklist is a static page running an open-source engine in your browser, so a typical corporate firewall does not get in the way as long as it allows JavaScript to load from Favtoo. For teams that need to host it themselves on an internal network, the underlying engine (standard browser APIs) is open-source and can be packaged into a private build with the same behaviour. Reach out via the Contact page if that is something you are exploring.