gifly

hoijunkim.github.io/gifly · Releases

Drop in a video or a set of images. Trim or reorder, pick a size, aspect, speed, loop and dither, then export a GIF, WebP or APNG - with a live size estimate and an optional target-size fit - and copy it straight to your clipboard.

Windows only. No installer, no runtime dependencies, no cgo. gifly does the timing and options; a bundled FFmpeg does the encoding.

Get gifly

Two builds on the releases page:

• gifly-<version>-win64.zip - the small app plus a ffmpeg/ folder next to it. Unzip and run gifly.exe; keep the ffmpeg/ folder beside it.
• gifly-<version>-standalone-win64.zip - one self-contained gifly.exe with FFmpeg inside. No folder to keep around; it is large because it carries FFmpeg and unpacks it on first run.

The build is not code-signed, so Windows SmartScreen warns on first run: More info > Run anyway. Verify the download against the published SHA256SUMS.txt if you want certainty.

Using it

One screen. On the left is the preview and the Make button; on the right are the options.

1. Pick a video (to trim) or Add images (to sequence) - gifly takes either.
2. Timing - a video's trim range and frame rate, or the images' per-frame duration and order.
3. Format (GIF / WebP / APNG), Size (a width plus a Free / 1:1 / 16:9 / 9:16 crop), Playback (loop, speed, reverse, boomerang), Quality (colors and dither for GIF, quality for WebP), and Output (a Discord / Slack / Twitter preset or a target size in MB).
4. Save - beside the source or a folder you choose, a name of your own, and what to do if the name is taken (number, overwrite or timestamp).
5. Make it. The live estimate tells you roughly how big it will be first; when it is done, Copy puts the file on your clipboard to paste into a chat, or Open folder reveals it.

Formats

• GIF - universal, 256 colors, selectable dithering (none / bayer / sierra2 / floyd).
• WebP - much smaller, lossy, with a quality slider.
• APNG - lossless, full color, largest.

Build from source

Requires Go 1.26+ and the Wails v2 CLI. gifly shells out to FFmpeg, so point it at one while developing:

# ffmpeg.exe and ffprobe.exe in this folder (an LGPL build works)
set GIFLY_FFMPEG_DIR=C:\path\to\ffmpeg\bin

wails dev      # run the app
wails build    # build build/bin/gifly.exe (needs an ffmpeg/ folder beside it)

Tests: go test ./.... The engine's real-FFmpeg tests are behind a build tag - go test -tags ffmpeg ./... with GIFLY_FFMPEG_DIR set. Release artifacts are built by scripts/package.sh <version>.

License

gifly is licensed under the PolyForm Noncommercial License 1.0.0.

gifly bundles FFmpeg, used unmodified under the LGPL-3.0. See NOTICE.txt and THIRD-PARTY-LICENSES/ffmpeg-LICENSE.txt. You can replace it with your own FFmpeg via GIFLY_FFMPEG_DIR or the ffmpeg/ folder.