Question 1

What shapes?

Accepted Answer

Rectangle, circle, arrow, and line overlays in addition to text annotations.

Question 2

Background badge?

Accepted Answer

Enable to add a dark semi-transparent badge behind text for better readability.

Question 3

Multiple annotations?

Accepted Answer

Run the generator multiple times and combine the Canvas commands in sequence.

Question 4

Font options?

Accepted Answer

The generated code uses Arial by default. Modify the font property for other typefaces.

Question 5

Private?

Accepted Answer

Yes — code is generated locally.

Question 6

Export format?

Accepted Answer

The Canvas is exported as PNG, which supports the transparent overlays.

Question 7

Will I notice a difference in the output from Image Annotator?

Accepted Answer

Image Annotator is built to preserve quality wherever the underlying image format allows it. Operations that are mathematically lossless (e.g. structural transformations, lossless re-encoding) round-trip with no perceptible change. Operations that involve a lossy codec inevitably introduce small artefacts at the byte level, but the defaults aim at the sweet spot where output looks or sounds the same to a normal viewer or listener while still being meaningfully smaller or faster than the input.

Question 8

How many times per day can I use Image Annotator?

Accepted Answer

Inputs are capped at 0 MB per file, which keeps memory usage stable across phones, tablets and older laptops. You can run Image Annotator as often as you need; every run produces a full-quality result.

Question 9

Does Image Annotator have an API?

Accepted Answer

Image Annotator is a browser-only tool by design and does not expose a hosted API. The reason is the same as the privacy story: there is no Favtoo backend doing the work, so there is no service to call. If you need to script the same transformation, the underlying engine (standard browser APIs) is open-source and can be used directly from your own code.

Question 10

Will Image Annotator ask me to pay to download the result?

Accepted Answer

Image Annotator is free to use. The processing runs in your browser, which keeps the per-user cost low enough that the tool can be offered openly. The download is the same file the engine produced — you can use it for as many runs as you need.

Question 11

Are jobs run with Image Annotator stored anywhere?

Accepted Answer

Favtoo keeps no copy of your file because Favtoo never receives your file. Image Annotator 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.

Question 12

How do I run Image Annotator over a folder of files?

Accepted Answer

Image Annotator 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.

Question 13

Is the source for Image Annotator available?

Accepted Answer

Image Annotator 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.

Question 14

What does the error message in Image Annotator mean?

Accepted Answer

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.

Question 15

Which browsers are supported by Image Annotator?

Accepted Answer

Image Annotator 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.

Explore more Image Tools