Alternatives to SeaMonster for all platforms with any license

Preview

Preview is a simple and elegant application by Apple for viewing and working with images and PDF documents. With a single click, Preview takes your PDF document full...

Free Mac
Built-in Image converter Image resizing Fill PDF Forms Add a feature

101 Like
Caesium

Caesium Image Compressor lets you compress your pictures up to 90% without visible quality loss. Providing a simple yet effective interface with a real-time preview and...

Free Open Source Mac Windows Linux Web Android
Batch rename files Batch processing Drag n drop Multiple languages ... Portable Add a feature

32 Like
XnConvert

XnConvert is an easy image converter for graphic files, photos and images available on Windows, MacOSX and Linux. It supports more than 400 file formats (jpeg, tiff...

Free Mac Windows Linux
Batch processing Watermark images Add a feature

43 Like
RIOT - Radical Image Optimization Tool

Saving images for web/email/other media with the best compression ratio and quality is a difficult task if you don’t have the right tools. Choosing the right format then...
- Warning Installer contains Open Candy adware and potentially more: https://www.virustotal.com/en/file/5c69ba60d82abbf73c6ac27a0cf39b054cb5a7cbc6fc8a6cb00d4daa6e069b73/analysis/
Free Windows GIMP XnView IrfanView
No features added Add a feature

75 Like
Imagine

Imagine is an Image & Animation Viewer for Windows with screen capture function.

Free Windows Windows Mobile
Batch conversion Portable Capture Screen / Take screenshots Add a feature

52 Like
PNGGauntlet

-Combines PNGOUT, OptiPNG, and DeflOpt to create the smallest PNGs -No image quality is lost — only file size -Converts JPG, GIF, TIFF, and BMP files to PNG ...

Free Windows
Lossless Compression File Compression Works Offline PNG Compression Add a feature

28 Like
Universal Viewer

Universal Viewer is an advanced file viewer for wide range of formats. Supported file formats are: Images: all major graphics formats: JPG BMP ICO GIF PNG WMF...
- Discontinued The program is no longer updated. Last versions, released in 2012-2013, can be still downloaded and bought from the official website.
Freemium Windows
Support for Large File Portable Add a feature

15 Like
Image Tuner

Image Tuner is a free software for batch resizing, converting, watermarking and renaming your digital photos and images from more than 20 image formats to JPEG, BMP...

Free Personal Windows
Batch conversion Batch rename files Watermark images Raw Photo processing Add a feature

17 Like
NexusImage

NexusImage is a simple image viewer program. supported formats: JPEG, Bitmap, GIF, PNG, TIFF, ICO, WMF, EMF

Free Windows
No features added Add a feature

18 Like
FastStone MaxView

FastStone MaxView is a fast, compact and innovative image viewer that supports all major graphic formats. Its intuitive layout lets you view images in a variety of ways....

Commercial Windows
No features added Add a feature

20 Like
Photozoom Pro

BenVista PhotoZoom Pro 5 is a software solution for enlarging and downsizing digital photos and graphics. PhotoZoom Pro 5 not only creates larger images than any...

Commercial Mac Windows
Image Upscaling Add a feature

11 Like
Ralpha Image Resizer

Ralpha Image Resizer is a lightweight and portable program that can perform image operations in batch mode, such as resizing and applying filters.

Free Windows
Batch conversion Batch processing Drag n drop Watermark images Add a feature

3 Like
ImageWell

ImageWell is a small, but powerful, image editing application that lets you quickly resize, crop, watermark, edit your images, take screenshots and then instantly upload...

Commercial Mac
No features added Add a feature

7 Like
Light Image Resizer

Light Image Resizer, previously called VSO Image Resizer, is a shareware resize image software. With it you can create e-mail friendly versions of your images, load them...

Commercial Windows
Batch rename files Convert images to PDF Watermark images Add a feature

15 Like
AdvanceCOMP

A collection of recompression utilities for your ZIP archives, PNG snapshots, MNG video clips and GZ files.

Free Open Source Mac Windows Linux
No features added Add a feature

1 Like