About GIF Fast
GIF Fast is a free browser-based workspace for converting and editing short animations, video clips, and images. Use one editor for trimming, cropping, resizing, frame-rate changes, captions, and format conversion.
Why We Built This
Media files can contain private details: names in a screen recording, location clues in a photo, or unfinished work in a product demo. GIF Fast is designed so that the file you select is processed locally in the browser rather than sent to a conversion server.
The tradeoff is that local processing uses your device's memory and CPU. Long or high-resolution clips can take time or exceed what a browser tab can handle. The editor therefore exposes practical controls such as trim, output width, frame rate, crop, playback speed, and output format so you can shape the job before encoding.
Privacy has boundaries: the site loads its FFmpeg WebAssembly binary from jsDelivr, web fonts from Google Fonts, and Google Analytics. Those services receive normal network requests from your browser. The selected media itself is processed in the tab; see the privacy policy for the distinction and details.
How It Works
GIF Converter uses FFmpeg compiled to WebAssembly (WASM) — the same FFmpeg binary that video professionals and developers use on the command line, running directly inside your browser tab.
The editor uses FFmpeg WebAssembly for media operations. It is not a hosted transcoding service: your browser downloads the runtime and runs it on your device. Processing speed depends on the source, selected settings, available memory, and device performance.
When you drop a file into the editor and click Convert, here is what happens:
- 1
Select a source
The browser reads the chosen file into the page for processing. File contents are not submitted to a conversion endpoint.
- 2
Load the runtime
The editor fetches FFmpeg WebAssembly assets from jsDelivr. A browser cache may make later loads quicker; network access is required when the assets are not cached.
- 3
Choose settings
Set a time range, dimensions, frame rate, crop, speed, or output format. These changes can affect smoothness, sharpness, transparency, and file size.
- 4
Preview and save
The output is created in browser memory. Preview it and check the measured size before downloading; inspect important files in their intended app as well.
Our Commitment
Free to use
The editor is available without an account or paid tier. There is no guarantee that service availability or current features will remain unchanged.
Local media processing
The selected media is processed in your browser instead of being uploaded to a conversion service. The site still makes requests for its runtime, fonts, analytics, and hosting.
Visible output controls
Settings are available before processing, and the editor reports the generated file size so you can compare the result with the source.
Technology Stack
The site is built with Astro and uses FFmpeg WebAssembly 0.12 in the editor. The FFmpeg JavaScript wrapper is served by the site, while its WebAssembly core is fetched from jsDelivr. Google Fonts and Google Analytics are also third-party requests.
The editor may require cross-origin isolation headers for its WebAssembly runtime. Deployment headers and browser support can affect whether processing starts; if it fails, try a current desktop browser, disable restrictive extensions for the page, and reload. Very large jobs may still run out of memory.
The informational pages are statically generated. The editor itself needs JavaScript, WebAssembly support, and a network connection to load its runtime when it is not already cached.
Ready to Try It?
Open the editor and convert your first file. Takes about 30 seconds start to finish.
Open the Editor