Web App Manifest Generator (PWA)
Generate a web app manifest (manifest.json) for PWA installation with icons, colors, and display mode.
How it works
- 1Configure your options above
- 2Click "Generate" — processing happens in your browser
- 3Copy or download the result
What to do next
About Web Manifest Generator
Web Manifest Generator runs the developer utility job locally inside your browser. Generate a web app manifest (manifest.json) for PWA installation with icons, colors, and display mode. The work happens on your machine, the result is generated on your machine, and the page exposes the controls you need to drive it without burying them in menus.
Anyone who works with developer utility on a casual basis — engineers debugging API payloads, frontend developers prepping fixtures, QA engineers writing repro cases — finds Web Manifest Generator a quick way to get the result. The page loads in under a second, the controls are visible from a single screen, and the result downloads or copies in one click.
Web Manifest Generator 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.
Web Manifest Generator is implemented on top of standard browser APIs. Inputs are read from the file picker or drop zone, decoded in the browser, processed, and re-encoded into the output format. Files up to 0 MB are well within the comfort zone of any modern browser.
Web Manifest Generator works well as a bookmarked utility you reach for when you need it. The first visit shows you what the tool does; the second is when you realise it is a low-friction option for the task and worth keeping in your tab list.
As a workflow component, Web Manifest Generator is the part you reach for when a single, well-defined developer utility step needs to happen. It performs that step and returns a standard file you can carry into the next part of your pipeline.
Web Manifest Generator returns the result as a download. If you are running multiple jobs, the output names will not collide as long as the input names differ. You can re-run with different settings as many times as you like; each run produces a fresh file with no caching trickery in between.
The only practical limit is the 0 MB per-file ceiling, which keeps the tool responsive across a wide range of devices. Run the tool ten times in a row, run it ten thousand times — it behaves the same way and produces the same quality of result.
Web Manifest Generator is honest about scope: it handles a single, well-defined developer utility step. Specialist edge-case work — uncommon formats, very large inputs, or pipelines that need scripting — is what dedicated desktop apps are for. This page handles the common case quickly.
Some background on the design choices behind Web Manifest Generator: 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.
If you want to get the most out of Web Manifest Generator, three small habits help. Drag-and-drop is faster than the file picker once you get used to it. The keyboard shortcut for downloading the result is whatever your browser uses for "save link as," because the result is a normal download. And if you are working on a sensitive file, processing in an Incognito or Private window is a good extra layer — it leaves no trace in browser history when the tab closes.
Common gotchas worth flagging: the supported formats are listed in the upload area. The 0 MB ceiling is per-file, not per-session; you can run as many separate jobs as you like, but a single oversized input will be rejected on load.
If you also use a command-line tool for web manifest generator, Web Manifest Generator 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 Web Manifest Generator. 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
- 1Open the Web Manifest Generator workspace above. The interface is a single page, so there is nothing to navigate.
- 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
- Compare two API responses to spot a regression using Web Manifest Generator.
- Hash a string for a quick reproducibility check.
- Inspect a payload during local development without writing a script.
- Generate boilerplate from a single specification line.
- Generate a quick fixture without leaving the browser.
- Convert between data formats while wiring up an integration.
- Decode a token to confirm its claims during a debugging session.
- Format a noisy log line into something a teammate can read.
- Encode binary content for transport in a JSON body.
- Pretty-print a minified blob during incident triage.
FAQ
What is a web manifest?
A JSON file that tells browsers about your PWA — name, icons, colors, and how to display it when installed.
Required fields?
name, short_name, start_url, display, and at least one icon for installability.
Display modes?
fullscreen, standalone (app-like), minimal-ui, or browser (normal tab).
Icon sizes?
At minimum 192×192 and 512×512 PNG icons. The tool generates references for all common sizes.
Where do I put it?
Save as manifest.json in your root and link it with <link rel="manifest" href="/manifest.json">.
Private?
Yes — generated locally.
How long does Web Manifest Generator take to process a file?
Most jobs finish in seconds. Speed scales with input size and with how many CPU cycles your browser tab has available — the engine runs in your browser, so it shares resources with whatever else you have open. For inputs near the 0 MB ceiling, expect anywhere from a few seconds to roughly a minute on a typical laptop. Closing other heavy tabs noticeably speeds things up.
How long does Favtoo retain my data after using Web Manifest Generator?
Favtoo keeps no copy of your file because Favtoo never receives your file. Web Manifest Generator 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 use Web Manifest Generator for commercial work?
Web Manifest Generator 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.
Is the source for Web Manifest Generator available?
Web Manifest Generator 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.
Does Web Manifest Generator require a browser extension or plug-in?
No installation is needed. Web Manifest Generator runs as a normal web page, with no browser extension, no native helper, and no separate desktop client to download. That is partly a privacy choice — extensions can request broad permissions, while a regular page is sandboxed by default — and partly a convenience one: you can use Web Manifest Generator on any computer you have temporary access to without leaving anything installed on it.
What does Web Manifest Generator do that command-line tools do not?
Desktop apps usually have more advanced features but require installation, maintenance and (often) a licence. Paid online tools are convenient but route your file through their servers and gate downloads behind accounts. Web Manifest Generator sits in between: free, instant, and private, but intentionally narrow in scope. For one-off jobs and the common developer utility operations, it is usually the lowest-friction choice; for highly specialised work, a dedicated app is still the right answer.
Does Web Manifest Generator upload my file to a server?
Your file is processed inside your browser by standard browser APIs. The engine reads the file's bytes from your tab's memory, computes the result, and writes the result back into the tab. You can confirm what the page does by opening developer tools and watching the Network tab during a run — the requests you see are for the tool's static assets only.
What input formats are supported by Web Manifest Generator?
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.