FramePress

INPUT

Your images

0 files

Drop images here

PNG, JPEG or WebP · Nothing is uploaded

OUTPUT

Compression

SMART

Format

Chooses PNG or JPEG based on the image.

Quality 80%

SmallerSharper

PNG colours Adaptive

Analyses each image and protects smooth gradients.

Never make files largerKeeps the original file, and its format, when it wins

Filename suffixAdded before the extension

Save as

ZIP archiveOne tidy download Individual filesChoose Desktop or any folder

Include report CSVOff by default. Added automatically if anything fails.

FramePress — Offline copy checking…

SPECIFICATION — NOT BUILT

GIF optimiser

Decode, optimise and re-encode animated GIFs on this device. Nothing below works yet. It is here so the design can be argued with before it is written.

Target file size

The thing ezgif cannot do. Name a ceiling — 2 MB for a forum, 512 KB for an email — and let the optimiser search for it, walking the levers from least to most destructive:

Lossy LZW — largest saving per unit of damage, adds fine speckle
Palette size, 256 down to 32 — banding at the low end
Frame dropping — judder
Scale — resolution, the last resort

It reports the SSIM of what it settled on, so the cost is visible rather than guessed. If the target is unreachable without gutting the image, it says so instead of quietly mangling it.

Optimisation methods

Lossy GIF, adjustable level
Colour reduction, with and without dithering
Single colour table across all frames
Remove duplicate frames, merging their durations
Remove every 2nd, 3rd or 4th frame
Optimise transparency, with a fuzz factor
Coalesce, to undo frame optimisations
Combined: duplicates + transparency + lossy

Engine

gifsicle compiled to WebAssembly — the same encoder the site you screenshotted runs server-side, at 358 KB, including the lossy LZW mode that is the single biggest lever on GIF size.

Palette selection goes through the SSIM-guided search already used by Smart PNG mode, rather than a fixed colour count.

Cost: WebAssembly needs 'wasm-unsafe-eval' in the script policy. It will be loaded only when this tool is opened, never precached.

SPECIFICATION — NOT BUILT

Video to GIF

Turn a clip into an animated GIF without it leaving the machine. Nothing below works yet.

Hardware decoding

WebCodecs VideoDecoder with mp4box.js for demuxing, falling back to frame-stepping a video element for anything it cannot open.

This decodes on the GPU. The alternative, ffmpeg compiled to WebAssembly, ships a 32 MB binary that exceeds the 25 MiB per-file limit on Cloudflare Pages, so it could not be self-hosted even if it were faster — and it is not.

Controls

Trim in and out, scrubbing on decoded frames
Frame rate, with the source rate shown
Output width, aspect locked
Loop count, ping-pong, reverse
Crop
The same target file size search as the optimiser

Formats

MP4, MOV and WebM through WebCodecs where the browser exposes the codec. Anything else falls back to the video element, which is slower but accepts whatever the browser can play.

Safari gained WebCodecs in 16.4 and Firefox in 130. Older browsers get the fallback path, not an error.