A multi-format, recursive, multiprocessor aware, command line, lossless image optimizer utility that can use external tools for even better optimizing.
Picopt will optionally drop hidden timestamps at the root of your image directories to avoid reoptimizing images picopt has already optimized.
Picopt transforms images in place and throws out the old image. Always have a backup of images before running picopt in case you are not satisfied with the results.
Converting lossy images rarely makes sense and so picopt only optimizes them in their current format.
Lossless WebP images are smaller than PNG, much smaller than GIF and, of course, a great deal smaller than uncompressed bitmaps like BMP. As such the best practice is probably to convert all lossless images to WebP Lossless as now all major browsers support it. The only downside is that decoding WebP Lossless takes on average 50% more CPU than PNG. All major desktop and mobile browsers support WEBP. WEBP is the lossless format of choice. Until perhaps JPEG XL support arrives for browsers.
Sequenced Images, like animated GIFs and WebP, most of the time, should be converted to a compressed video format like HEVC, VVC, VP9 or VP10. There are several situations where this is impractical and so Animated WebP is now a good substitute.
By default, picopt does not convert images between formats. You must turn on conversion to PNG or WebP explicitly.
Because picopt supports so many lossless image formats, to avoid surprises if you specify a conversion target, picopt will only convert GIF and PNG images to the target by default. To convert another format, like BMP, to WEBP you must specify that you want to read the BMP format and that you want to convert it to WEBP:
picopt -x BMP -c WEBP big_old.bmp
To optimize JPEG images at all picopt needs one of mozjpeg or jpegtran on the path. in order of preference.
Picopt uses an internal oxipng python module to optimize PNG images and convert other lossless formats to PNG picopt. The external pngout tool can provide a small extra bit of compression.
Animated PNGs are optimized with the internal optimizer.
Gifs and Animated GIFs are optimized with gifsicle if available. or interaallly if is not. Gifsicle only provides a small advantage over the internal optimizer.
WebP lossless formats are optimized with cwebp if available and with the internal optimizer if not. cwebp provides significant improvements over the internal optimizer.
Picopt can only optimize SVGs if svgo is on the path.
Picopt can extract the primary image from a multi JPEG MPO that also contains
thumbnails and convert the file to an ordinary JPEG. Picopt will also optimize
this image if it can. To enable this you must run with -x MPO -c JPEG
Steroscopic MPOs should have no primary image tagged in the MPO directory and be
unaffected.
This feature has not been tested with a large variety of MPOs and should be considered experimental.
EPub Books are zip files that often contain images and picopt unpacks and repacks this format natively. Images within the epub are handled by other programs. EPub optimization is not turned on by default. EPub contents are never converted to other formats because it would break internal references to them.
Picopt uncompresses, optimizes and rezips comic book archive files. Be aware that CBR rar archives may only be rezipped into CBZs instead of CBR. Comic book archive optimization is not turned on by default to prevent surprises.
Picopt requires Python 3.10 or greater installed on whichever system you use.
Picopt is most effective with these binary dependencies installed. We must install these first
brew install gifsicle mozjpeg svgo webp
ln -s $(brew --prefix)/opt/mozjpeg/bin/jpegtran /usr/local/bin/mozjpeg
apt-get install gifsicle python-imaging webp
if you don't want to install mozjpeg using the instructions below then use jpegtran:
apt-get install libjpeg-progs
See mozjepg, pngout & svgo install instructions below
dnf install gifsicle python3-pillow libwebp-tools
if you don't want to install mozjpeg using the instructions below then use jpegtran:
dnf install libjpeg-turbo-utils
See mozjepg, pngout & svgo install instructions below
pip install picopt
Picopt will perform optimization on most lossless formats without using external programs, but much more compression is possible if these external programs are on your path.
mozjpeg offers better compression than libjpeg-progs jpegtran. It may or may not be packaged for your *nix, but even when it is, picopt requires that its separately compiled version of jpegtran be symlinked to 'mozjpeg' somewhere in the path.
Instructions for installing on macOS are given above. Some near recent binaries for Windows and Debian x86 can be found here. Most Linux distributions still require a more manual installation as elucidated here on Casey Hoffer's blog
pngout is a compression tool that can be used for small extra compression. It does not run on 16 bit PNGs.
It can be installed on macOS with:
brew install jonof/kenutils/pngout
It is not packaged for linux, but you may find the latest binary version
on JonoF's site. Picopt looks for the binary
to be called pngout
svgo compresses SVGs. Svgo is packaged for homebrew, but picopt can also use it if it's installed with npm.
To install svgo on Linux you can use the snap tool:
snap install svgo
Or you can install svgo with npm:
npm install -G svgo
Optimize all JPEG files in a directory:
picopt *.jpg
Optimize all files and recurse directories:
picopt -r *
Optimize files, recurse directories, also optimize ePub & CBZ containers, convert lossless images into WEBP, convert CBR into CBZ.
picopt -rx EPUB,CBR,CBZ -c WEBP,CBZ *
Optimize files and recurse directories AND optimize comic book archives:
picopt -rx CBZ *
Optimize comic directory recursively. Convert CBRs to CBZ. Convert lossless images, including TIFF, to lossless WEBP. Do not follow symlinks. Set timestamps.
picopt -rStc CBZ,WEBP -x TIFF,CBR,CBZ /Volumes/Media/Comics
Optimize all files, but only JPEG format files:
picopt -f JPEG *
Optimize files and containers, but not JPEGS:
picopt -f GIF,PNG,WEBP,ZIP,CBZ,EPUB *
Optimize files, but not animated gifs:
picopt -f PNG,WEBP,ZIP,CBZ,EPUB *
Just list files picopt.py would try to optimize:
picopt -L *
Optimize pictures in my iPhoto library, but only after the last time I did this, skipping symlinks to avoid duplicate work. Also drop a timestamp file so I don't have to remember the last time I did this:
picopt -rSt -D '2013 June 1 14:00' 'Pictures/iPhoto Library'
imagemin looks to be an all in one cli and gui solution with bundled libraries, so no awkward dependencies.
Imageoptim is an all-in-one OS X GUI image optimizer. Imageoptim command line usage is possible with an external program.
FAQs
A multi format lossless image optimizer that uses external tools
We found that picopt demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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