Edit animated GIFs in your browser with FFmpeg WASM — resize (Lanczos, aspect lock), speed (setpts), reverse, palette optimize (max_colors with bayer dither), and PNG frame extraction to <name>_frames.zip. No crop, text, or trim tools. Header shows WxH, frame count, KB, and seconds.
Content reviewed October 2026 · About Toolzum
Resize one animated GIF to exact dimensions via FFmpeg Lanczos (default), Bilinear, or Nearest — width presets 100/150/200/320/480/640px or custom, height auto-follows with aspect lock ON (unlock to stretch). W/H prefill from the source; saves as <name>-resized.gif with animation intact.
Compress one animated GIF with FFmpeg: colors slider 2–256 (default 128), Floyd or no dithering, loss tolerance 0–100 (above 50 flips lossless to lossy), and optional duplicate-frame removal (mpdecimate, off by default). Output fps locks to 10; result shows KB and -% and saves as <name>-compressed.gif.
Upgrade one GIF to APNG via FFmpeg apng codec at locked 10fps and source dimensions (Lanczos) — 24-bit color plus 8-bit alpha, no size/quality settings. Result panel shows GIF vs APNG KB with ±% change; saves as <name>.png. Modernize sticker packs — local FFmpeg work, unlimited saves.
Reduces MP4, MOV, and WebM video file sizes with a configurable CRF 20–40 slider (default 28, libx264 fast preset), plus a GIF mode with color-palette control. Videos never leave your device — compression runs locally in your browser with FFmpeg WASM.
Convert MP4/WebM to GIF animations. Videos up to 250MB. Videos never leave your device — compression and conversion run locally in your browser with FFmpeg WASM.
Resize, playback speed, reverse, palette optimization, and PNG frame extraction — that is the complete op list. No crop, text overlays, or clip trimming exist.
Yes — processing forces loop forever (-loop 0, -ignore_loop 0) and edits preserve animation; exports play everywhere GIFs play.
Trim dimensions via Lanczos resize and cap palette max_colors first — the two levers that shrink GIFs most. Palette mode uses stats diff/single with bayer dither scale 5.
No — editing runs locally in your browser via FFmpeg WASM; unlimited saves on local tools.
GIF Compressor
Compress one animated GIF with FFmpeg: colors slider 2–256 (default 128), Floyd or no dithering, loss tolerance 0–100 (above 50 flips lossless to lossy), and optional duplicate-frame removal (mpdecimate, off by default). Output fps locks to 10; result shows KB and -% and saves as <name>-compressed.gif.
GIF Resizer
Resize one animated GIF to exact dimensions via FFmpeg Lanczos (default), Bilinear, or Nearest — width presets 100/150/200/320/480/640px or custom, height auto-follows with aspect lock ON (unlock to stretch). W/H prefill from the source; saves as <name>-resized.gif with animation intact.