Invoice Generator — Create Invoices Online
Create professional invoices and export them as PDF.
Edit the template above: from, to, items (description, quantity, unitPrice), invoiceNumber, date, dueDate, taxRate, notes.
What to do next
Related tools
About Invoice Generator
Invoice Generator is part of a collection of single-purpose developer utility tools. Create professional invoices and export them as PDF. Each tool is intentionally narrow — it does one thing well rather than offering many overlapping features — which makes the common path predictable and the result easy to verify before you download or copy it.
Behind the controls you see, the open-source pdf-lib JavaScript library is doing the actual developer utility. Formats are detected on load and the engine produces a deterministic output for any given input + options combination — useful when you need to re-run a job and expect identical results.
Invoice Generator parses your file with the open-source pdf-lib JavaScript library 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.
The heaviest users of Invoice Generator tend to be frontend developers prepping fixtures, devops engineers crafting one-liners and students learning new languages. Each group brings slightly different expectations to the tool, but the same single-page architecture serves every one of them with the same response time.
Invoice 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.
The architecture imposes only the limits the browser itself imposes. The published 0 MB ceiling is conservative; most modern devices comfortably handle inputs up to that size, and the cap exists so the tool degrades gracefully on phones and budget laptops rather than running out of memory.
Even on its own, Invoice Generator composes well with the rest of your toolkit. The output is a standard developer file that opens in any program that handles the format, so the result of one run can become the input to whatever step you use next.
Some notes on the design of Invoice Generator. The page is intentionally narrow: one input, the controls relevant to the task, and one output. Adding unrelated features would make the common case slower for the majority of users, so the surface is held to what people actually use.
The output handed back by Invoice Generator is `invoice-{date}.pdf`. If you would prefer to keep the result in the browser instead of downloading it, you can copy it from the result panel and paste it directly into another tab — useful when the next tool in your workflow expects pasted text rather than a file.
A short note on how Invoice Generator came to look the way it does: every iteration started by watching how someone unfamiliar with the tool actually used it, then removing whatever got in their way. That is why the upload area dominates the screen, the run button is bigger than the secondary controls, and the result panel is unmissable when the job finishes.
If you also use a command-line tool for invoice generator, Invoice 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.
Pro tip: Invoice Generator works just as well in a private/incognito window as in a normal one, which is occasionally useful when you want zero browser-history footprint of the job. Another tip: if the tool ever feels slow, it is almost always because the browser tab is competing for CPU with another tab — pausing or closing the heavy ones gives the engine room to work.
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.
Invoice Generator is one of many single-purpose tools in the catalog. Each is built around the same single-page model. Use this one, close the tab, and come back the next time you need the same job done. None of the tools require prior knowledge of the others — each page is self-contained.
How it works
- 1Open the Invoice 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.
- 4Click to start the job. The engine (the open-source pdf-lib JavaScript library) processes the input in the page; you can watch the progress indicator until it completes.
- 5Save the output (`invoice-{date}.pdf`) when it is ready.
- 6Run additional jobs as needed. The same controls and defaults apply on every run.
Common use cases
- Hash a string for a quick reproducibility check using Invoice Generator.
- Encode binary content for transport in a JSON body.
- Inspect a regex against a test string before committing it.
- Convert between data formats while wiring up an integration.
- Validate a config blob before pushing to staging.
- Generate boilerplate from a single specification line.
- Format a noisy log line into something a teammate can read.
- Decode a token to confirm its claims during a debugging session.
- Compare two API responses to spot a regression.
FAQ
What information can I include?
Business name, client details, line items with quantities and prices, tax rate, and payment terms.
Can I add my logo?
Yes — upload your logo to appear on the invoice header.
Is the invoice a proper PDF?
Yes — the output is a standard PDF file that can be printed or emailed.
Are jobs run with Invoice Generator stored anywhere?
Favtoo keeps no copy of your file because Favtoo never receives your file. Invoice 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.
Does Invoice Generator work on a phone or tablet?
Invoice Generator runs in any modern mobile browser — Safari, Chrome, Firefox and the in-app browsers in most messaging apps all support the underlying APIs. Performance depends on the device: a recent phone handles typical inputs nearly as fast as a laptop, while older devices may take a few seconds longer near the 0 MB ceiling. The interface lays out cleanly on small screens, so you do not need to pinch-zoom to see the controls.
Is there a desktop version of Invoice Generator?
No installation is needed. Invoice 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 Invoice Generator on any computer you have temporary access to without leaving anything installed on it.
How do I know I am using the latest version of Invoice Generator?
Invoice Generator is updated whenever the underlying engine releases an improvement or a bug fix. Because the tool is delivered as a static page, every visit fetches the latest version automatically — there is no "version" to manage on your end. If a particular release ever changes default behaviour, the change is documented on Favtoo's changelog so you can confirm what shifted.
Are there any usage limits on Invoice Generator?
Inputs are capped at 0 MB per file, which keeps memory usage stable across phones, tablets and older laptops. You can run Invoice Generator as often as you need; every run produces a full-quality result.
What should I do if Invoice Generator 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 the source for Invoice Generator available?
Invoice 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 (the open-source pdf-lib JavaScript library) 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.