How to Use
- Choose a GIF from your device.
- Set quality and frame rate:
- CRF (quality): 18–35 (default 23). Lower = better quality & larger size.
- FPS: 5–60 (default 30). GIF’s variable frame timing is normalized to a fixed FPS.
- Click Convert: first run loads ffmpeg.wasm and may take a few seconds. Progress appears in the log.
- Download the generated MP4.
Output / Result
- MP4 (H.264 / yuv420p / faststart) video file
- Filename mirrors the original GIF (extension becomes
.mp4). - Video only (no audio track).
- yuv420p for broad compatibility and faststart for better streaming.
- Filename mirrors the original GIF (extension becomes
[Completely Free] Utility Tools & Work Support Tools
You can use practical tools like CSV formatting, PDF conversion, and ZIP renaming entirely in your browser, all for free. Each tool page clearly explains “How to use it”, “What the output looks like”, and “Important notes & caveats”, so even first-time users can start without confusion.
Notes & Caveats
- Client-side only: no file upload to servers.
- CDN dependency: loads
@ffmpeg/ffmpeg 0.12.6and@ffmpeg/core 0.12.6from CDNs; blocked in strict CSP / offline environments. - Even dimensions: width/height are forced to even numbers for H.264 (minor rescale is expected).
- Transparency: GIF alpha is lost in MP4 (transparent areas become opaque).
- Lossy encoding: H.264 is not lossless. Lower CRF = higher quality & larger files.
- Heavy inputs: large or long GIFs may hit browser memory limits—downscale or split before converting.
- Autoplay: many browsers require muted autoplay; set
<video muted autoplay loop>as needed. - Looping: MP4 doesn’t carry loop info; use the HTML
loopattribute. - Timing: GIFs with variable delays will be mapped to a constant FPS, which can slightly alter perceived speed.
- Metadata: EXIF/ICC profiles are typically stripped during re-encode.
- Logs: progress/errors surface in the on-screen log.
