Question 1

What is horizontal flip?

Accepted Answer

Mirrors the image left-to-right, like looking in a mirror. Useful for correcting selfie camera orientation.

Question 2

What is vertical flip?

Accepted Answer

Flips the image upside down (top-to-bottom).

Question 3

Does flipping both equal rotation?

Accepted Answer

Yes — flipping both horizontally and vertically is equivalent to a 180° rotation.

Question 4

Is animation preserved?

Accepted Answer

Yes — frame order, timing, and loop settings remain unchanged. Only the pixel data is flipped.

Question 5

File size impact?

Accepted Answer

Minimal — flipping does not change the compression or color table, so file size stays approximately the same.

Question 6

Private?

Accepted Answer

Yes — processed locally in your browser.

Question 7

Why is in-browser GIF processing slower than online editors?

Accepted Answer

Server-side editors run on dedicated CPUs with native code paths and parallel workers. Our GIF engine decodes every frame with gifuct-js and re-encodes with gifenc — both pure JavaScript libraries running single-threaded inside your browser tab, which is typically 2–5× slower than a backend pipeline. The trade-off is total privacy: your GIF is never uploaded, never logged, never stored on any third-party server. Closing the tab erases everything from memory immediately. For most short loops the wait is small, and for sensitive material — work captures, dashboards, private screen recordings — the privacy gain is well worth the few extra seconds.

Question 8

Is my GIF uploaded to a server?

Accepted Answer

No. Everything runs entirely inside your browser tab using gifuct-js for decoding, the HTML5 Canvas API for pixel work, and gifenc for re-encoding. The file is decoded into local memory only, processed in the same tab, and the result is offered as a direct download. Nothing is transmitted to any server, no account is required, no analytics are tied to your file, and closing the tab discards every byte from memory.

Question 9

How big a GIF can I process?

Accepted Answer

Up to 50MB and roughly 16 megapixels per frame, with a soft cap of about 600 frames. The limit exists because every frame needs to fit inside your tab's memory as full-resolution RGBA pixels (four bytes per pixel). Most short loops, screen recordings, and reaction GIFs sit comfortably under that ceiling. If your GIF is larger, run the GIF Compressor or GIF Frame Skipper first to bring it down before applying further effects.

Question 10

How are colours quantized in the output?

Accepted Answer

gifenc builds a fresh palette per frame using a wu-quant algorithm with up to 256 colours. This keeps colour-shifting effects (fades, glitch, brightness) accurate even when the source palette was tiny. You can lower the colour count in the Color Reducer / Compressor / Lossy Compressor tools to trade colour fidelity for smaller files.

Question 11

Are transparent backgrounds preserved?

Accepted Answer

Yes — gifuct-js gives us a per-frame alpha channel from the original GIF's disposal data, and we composite frames into RGBA buffers so transparency survives every effect. When you re-encode, gifenc writes a 1-bit transparent palette index whenever the source alpha was zero, so transparent regions remain transparent in the output.

Question 12

Does the loop count carry over?

Accepted Answer

Yes — when the source GIF declares a loop count via the NETSCAPE2.0 application extension, we read it during decoding and write the same value into the output container. If the source has no loop block (a one-shot GIF), the output also plays once. Tools that explicitly let you change loop behaviour (Loop Editor, Boomerang, Player) override this and write whatever loop count you choose.

Question 13

Which browsers are supported?

Accepted Answer

Recent Chrome, Edge, Firefox, Safari, and other Chromium-based browsers all work. The tool only relies on the standard HTML5 Canvas API, ArrayBuffer, and Blob URLs, all of which have been universally supported for over a decade. Mobile browsers work too, although large GIFs may take noticeably longer because phone CPUs are weaker than desktop CPUs.

Question 14

Is there a watermark or sign-up wall?

Accepted Answer

No. The tool is completely free, requires no account, attaches no watermark, and shows no popup ads on your output. A small fair-use throttle runs in the background to discourage automated abuse, but it does not affect normal one-off conversions. The downloaded GIF is exactly what gifenc wrote out from your edited frames — nothing more, nothing less.

Question 15

Is there a desktop version of GIF Flipper?

Accepted Answer

No installation is needed. GIF Flipper 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 GIF Flipper on any computer you have temporary access to without leaving anything installed on it.

Question 16

Does GIF Flipper support batch processing?

Accepted Answer

GIF Flipper 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 17

Is the source for GIF Flipper available?

Accepted Answer

GIF Flipper 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 18

Are jobs run with GIF Flipper stored anywhere?

Accepted Answer

Favtoo keeps no copy of your file because Favtoo never receives your file. GIF Flipper 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 19

How do I know I am using the latest version of GIF Flipper?

Accepted Answer

GIF Flipper 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.

Question 20

Is there a programmatic version of GIF Flipper?

Accepted Answer

GIF Flipper 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 21

Can I use GIF Flipper on documents that contain personal data?

Accepted Answer

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.

Question 22

Which browsers are supported by GIF Flipper?

Accepted Answer

GIF Flipper 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.

Question 23

Why use GIF Flipper instead of a paid online tool?

Accepted Answer

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. GIF Flipper sits in between: free, instant, and private, but intentionally narrow in scope. For one-off jobs and the common image editing and conversion operations, it is usually the lowest-friction choice; for highly specialised work, a dedicated app is still the right answer.

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