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TinyPNG API wrapper for compressing PNG & JPG images

An actively maintained & developed fork of gulp-tinypng.

Main differences from gulp-tinypng:

  • File signature checking (to minimise unnecessary API calls, optional)
  • No temporary files/folders are created on compressed image download - fed straight from tinypng to the pipe
  • Maintained with the intention of standardising the tinypng featureset across gulp & grunt (and others too!)


Requires node 0.10.x or above

Install with npm - In your project folder, run:

npm install gulp-tinypng-compress

To run tests:

npm test


var gulp = require('gulp');
var tinypng = require('gulp-tinypng-compress');
gulp.task('tinypng', function () {
            key: 'API_KEY',
            sigFile: 'images/.tinypng-sigs',
            log: true



Returns Stream containing compressed images


Type: Object / String Default: false

Sets options described below from its properties. If type is not object, string presumed (the API key)


Type: String Default: ''

Your TinyPNG API key to use for requests


Type: String Default: ''

If set to a filename, it will compare existing source file md5 signatures against those found in the file's json data. When the signatures match, the file is skipped from being minified again, allowing you to better stay within your API request limits. When an image is minified, the md5 signature is determined from the unminified source image and written to the file at options.sigFile (a suggested location would be somewhere under your source control).

Signatures are based off the unminified source image, so that when the source changes it will be re-minified and re-written to the destination file.


Type: Boolean Default false

If your source is the same as your destination (images are written over themselves), and you want to use the signature checking feature, set this to true

Note: If your source and destination are the same, it's recommended you use this, and options.sigFile, as it prevents you from continually uploading already compressed images each time you run the task


Type: Boolean Default: false

Outputs statistics once all images have been handled.

[09:47:43] gulp-tinypng-compress Skipped: 0 images, Compressed: 1 image, Savings: 3.98 KB (ratio: 0.4109)


Type: Boolean Default: false

Set to true to log errors & messages to the console. Errors are dispatched via events anyway, so plugins like gulp-plumber can handle these for you.


Type: Boolean Default: true

Enables concurrent uploads to the TinyPNG server to speed up total compression time.

(thanks HugoHeneault for this feature suggestion)


Type: Integer Default: 5

The amount of concurrent uploads allowed at one time, increase if you/your request limits can handle it - very easy to max out your monthly requests, use with caution!


Type: Boolean / String Default: false

Force compress images regardless of signature. Value can either be true to force all images, or a glob pattern string to match against the filename(s).

Can also be performed from the command line:

$ gulp png --force 'icon-*.png'

This feature was added as it's impossible to know where the files are being written to at this point in the stream, unless the directory is directly passed into the config (pretty ugly). So the option was added to force certain (or all) files to be compressed when required.


Type: Boolean / String Default: false

Same as options.force except ignores files if the glob is matched

--ignore flag on the command line

Deprecated/non-functional options

options.checkSigs - Removed in favor of options.sigFile


MIT © Stan Hutcheon - Bigfork Ltd.

Original license:

MIT © Gaurav Jassal

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